Page 1 SERVICE MANUAL INVERTER-DRIVEN MULTI-SPLIT SYSTEM HEAT PUMP AND HEAT RECOVERY AIR CONDITIONERS Service Manual < Water Source Units > 208/230V (H,Y)VWH(P,R)072B32S, (H,Y)VWH(P,R)096B32S, (H,Y)VWH(P,R)120B32S, (H,Y)VWH(P,R)144B32S, (H,Y)VWH(P,R)168B32S, (H,Y)VWH(P,R)192B32S, (H,Y)VWH(P,R)216B32S 460V (H,Y)VWH(P,R)072B42S, (H,Y)VWH(P,R)096B42S, (H,Y)VWH(P,R)120B42S, (H,Y)VWH(P,R)144B42S, (H,Y)VWH(P,R)168B42S, (H,Y)VWH(P,R)192B42S, (H,Y)VWH(P,R)216B42S SM-18006...
Page 3 Important Notice ● Johnson Controls Inc. pursues a policy of continuing improvement in design and performance in its products. As such, Johnson Controls Inc. reserves the right to make changes at any time without prior notice. ● Johnson Controls Inc. cannot anticipate every possible circumstance that might involve a potential hazard.
Page 4 Liability does not cover defects originating from unauthorized modifications performed by a customer without the written consent of Johnson Controls, Inc. Performing any mechanical alterations on this product without the consent of the manufacturer will render your warranty null and void.
Page 5 Never bypass or jump-out any safety device or switch. ● Johnson Controls will not assume any liability for injuries or damage caused by not following steps outlined or described in this manual. Unauthorized modifications to Johnson Controls products are prohibited as they…...
Page 6 Take the following precautions to reduce the risk of property damage. ● Be careful that moisture, dust, or variant refrigerant compounds not enter the refrigerant cycle during installation work. Foreign matter could damage internal components or cause blockages. ● If air filters are required on this unit, do not operate the unit without the air filter set in place. If the air filter is not installed, dust may accumulate and breakdown may result.
Page 7 ● Before performing any brazing work, be sure that there are no flammable materials or open flames nearby. ● Perform a test run to ensure normal operation. Safety guards, shields, barriers, covers, and protective devices must be in place while the compressor/unit is operating. During the test run, keep fingers and clothing away from any moving parts.
Page 8 Controls uses only refrigerants that have been approved for use in the unit’s intended home country or market. Johnson Controls distributors similarly are only authorized to provide refrigerants that have been approved for use in the countries or markets they serve. The refrigerant used in this unit is identified on the unit’s faceplate and/or in the associated manuals.
Page 9 When shielded cable is applied, secure properly and terminate cable shield as required per Johnson Controls guidelines. Plenum and riser ratings for communication cables must be considered per application and local code requirements.
Page 10 ● After ceasing operation, be sure to wait at least five minutes before turning off the main power switch. Otherwise, water leakage or electrical breakdown may result. Disconnect the power supply completely before attempting any maintenance for electrical parts. Check to ensure that no residual voltage is present after disconnecting the power supply.
Page 11: Table Of Contents
- Table of Contents - 1. Installation ..........................1-1 1.1 Water Source Unit ...........................1-2 1.2 Change-Over Box..........................1-3 1.2.1 Single Branch Type: COBS048B22S, COBS096B22S ............1-3 1.2.2 Multiple Branch Type: COB04M132B22S,COB08M264B22S, COB12M264B22S ....1-3 1.2.3 Single Branch Type (for Chicago): COBS048B22C, COBS096B22C ........1-3 1.3 Optional Parts (Piping Kit) .......................1-4 1.3.1 Multi-Kit (Line Branch) for Heat Recovery System (3-Pipes Connection): MW-NP142X3, MW-NP282X3, MW-NP452X3, MW-NP562X3, MW-NP902X3 ....1-4...
Page 12 - Table of Contents - 4. Maintenance ..........................4-1 4.1 Maintenance of Water Source Unit ....................4-2 4.1.1 Removing Service Cover and Front Cover ................4-2 4.1.2 Attaching Service Cover and Front Cover ................4-3 4.1.3 Removing Upper Cover ......................4-4 4.1.4 Removing Rear Cover ......................4-5 4.1.5 Removing Pipe Cover ......................4-6 4.1.6...
Page 13 - Table of Contents - 4.2 Main Parts ............................4-71 4.2.1 Inverter for 208/230V Type .....................4-71 4.2.2 Inverter for 460V Type ......................4-78 4.2.3 Printed Circuit Board ......................4-85 4.2.4 Scroll Compressor ........................4-86 4.2.5 Cooling Fan ..........................4-92 4.2.6 Thermistor ..........................4-93 4.2.7 Electronic Expansion Valve ....................4-96 4.2.8 Pressure Sensor ........................4-99 4.2.9...
Page 14 6.1 Maintenance Work for Water Circuit....................6-2 6.2 Caution for Refrigerant Leakage .....................6-2 6.3 Modifications of Charging Refrigerants Other than Those Specified by Johnson Controls .....6-3 6.4 Maintenance Work for Cycle Operation ..................6-4 6.5 Service and Maintenance Record by 7-Segment Display ...............6-5 6.6 Service and Maintenance Record by Wired Controller ..............6-9...
Page 15: Installation
INSTALLATION 1. Installation SM-18006...
Page 16: Water Source Unit
INSTALLATION 1.1 Water Source Unit Refer to the Installation Manual for Water Source Unit. SM-18006...
Page 17: Change-Over Box
INSTALLATION 1.2 Change-Over Box 1.2.1 Single Branch Type: COBS048B22S, COBS096B22S 1.2.2 Multiple Branch Type: COB04M132B22S,COB08M264B22S, COB12M264B22S 1.2.3 Single Branch Type (for Chicago): COBS048B22C, COBS096B22C For more information of the above Change-Over Box, please refer to the Installation Manuals for each product.
Page 18: Optional Parts (Piping Kit)
INSTALLATION 1.3 Optional Parts (Piping Kit) 1.3.1 Multi-Kit (Line Branch) for Heat Recovery System (3-Pipes Connection): MW-NP142X3, MW-NP282X3, MW-NP452X3, MW-NP562X3, MW-NP902X3 1.3.2 Multi-Kit (Line Branch) for Heat Pump System and Heat Recovery System (2-Pipes Connection): MW-NP282A3, MW-NP452A3, MW-NP692A3, MW-NP902A3 1.3.3 Multi-Kit (Header Branch) for Heat Recovery System (3-Pipes Connection): MH-NP288X 1.3.4...
Page 19: Operation
OPERATION 2. Operation SM-18006...
Page 20 OPERATION Refer to the Operation Manual for Indoor Unit or Controller. SM-18006...
Page 21: Troubleshooting
TROUBLESHOOTING 3. Troubleshooting SM-18006...
Page 22: Initial Troubleshooting
TROUBLESHOOTING Initial Troubleshooting 3.1.1 Checking Electrical Wiring and Power Supply Check the following items for any abnormalities in the activation of the system. Check Situation Check Method Is any power supply breaker or Check the voltage (secondary side) of the breaker and also fuse open? check the continuity of the fuse with a tester.
Page 23 TROUBLESHOOTING Example for Electrical Wiring Connection Water Source Unit A (Main) L1 L2 L3 1 2 3 4 Ground Main Switch TB : Terminal Block PCB : Printed Circuit Board : Field Wiring : Communication Line GFCI DC5V (Non-Pole Communication H-LINK System) GFCI : Optional Part (Field Supplied) : Optional Accessory...
Page 24 When shielded cabling is applied, proper bonding and termination of the cable shield is required as per Johnson Controls guidelines. Plenum and riser ratings for communication cables must be considered per application and local code requirements.
Page 25 TROUBLESHOOTING Install a multi-pole main switch with a space of 1/8 inch (3.5mm) or more between each phase. ● Adjust wiring size when wiring runs are abnormally long. Electrical code must be followed and total voltage drop must not exceed 2%. ●...
Page 26: Location Of Printed Circuit Boards (Pcbs)
TROUBLESHOOTING 3.1.2 Location of Printed Circuit Boards (PCBs) ● 208/230V Type Model: (H,Y)VWH(P,R)144~216B32S Model: (H,Y)VWH(P,R)072~120B32S DCL1 DCL1 INV1 INV1 INV2 MPB1 MPB1 PCB1 PCB1 DCL2 MPB2 ● 460V Type Model: (H,Y)VWH(P,R)144~216B42S Model: (H,Y)VWH(P,R)072~120B42S INV1 INV1 INV2 PCB1 DCL1 PCB1 DCL2 DCL1 SM-18006...
Page 27 TROUBLESHOOTING z Purpose Symbol Purpose PCB1 Water Source Unit PCB 1. Transmitting between Indoor Unit and Water Source Unit 2. Processing for Sensor Input 3. Processing for DIP Switch Input 4. Operation Control for Above Items 1 to 3. Compressor Operation Control, Bypass Valve Control, Fan Control and Overcurrent Control 5.
Page 28 TROUBLESHOOTING Part Name Function Information Power Supply Indicator for Water Source Unit PCB (Low Voltage) LED1 (Red) Normal Condition: Activated / ON Abnormal Condition: Deactivated / OFF This LED2 indicates the communication state between the water source unit PCB and inverter PCB. LED2 (Green) Normal Condition: Flashing...
Page 29 TROUBLESHOOTING c. Inverter Printed Circuit Board for 460V Type: INV1, 2 (Inverter PCB) PV161 (INV1, 2) PCN2 LED401 DSW101 LED202 LED203 CN206 CN207 Part Name Function Information Power Supply Indicator for Inverter PCB LED401 (Red) Normal Condition: Activated / ON Abnormal Condition: Deactivated / OFF This indicates the state of the microcomputer.
Page 30: Checking Rotary Switch And Dip Switch Settings
TROUBLESHOOTING 3.1.3 Checking Rotary Switch and DIP Switch Settings The following diagram indicates the factory settings of DSWs on PCBs in the indoor and water source units. When simultaneous operation control of multiple units or room thermostat (thermo) control is operated, the DSW setting is different as shown below.
Page 31 TROUBLESHOOTING ● Setting for Communication Use the following settings for the water source unit numbers, refrigerant system numbers and end terminal resistance for this H-LINK system. ● Setting of Refrigerant System Number In the same refrigerant system, set the same refrigerant system number for the water source unit and the indoor units as shown below.
Page 32 TROUBLESHOOTING ● DSW7 Setting for Rated Voltage Voltage DSW7 Setting DSW7 is used for setting the rated voltage for the water source unit as shown at right. 208V 1 2 3 4 When the site power supply voltage is different from factory setting, a DSW7 setting is required.
Page 33: Checking Wired Controller
TROUBLESHOOTING 3.1.4 Checking Wired Controller Wired Controller Model: CIW01 Each “Check Menu” item and its function are explained in the following table. Check Menu Item Function Check 1 Sensor condition of air conditioner is monitored and displayed. Check 2 Sensor data of air conditioner is indicated prior to alarm occurrence. Alarm History Display Previous alarm record (date, time, alarm code) is displayed.
Page 34 TROUBLESHOOTING Features of Check Mode 1 No. Item Data Name No. Item Data Name Set Temp. Suction Pressure Inlet Air Temp. Control Information Discharge Air Temp. Operating Frequency Liquid Pipe Temp. I.U. Capacity Remote Thermistor Temp. O.U. Code Entering Water Temp. System Number (1) Gas Pipe Temp.
Page 35 TROUBLESHOOTING (2) Alarm History Display The Alarm History Display is accessed from the Check Menu. (1) Press and hold “Menu” and “ECO” simultaneously for 3 seconds during the normal Check Menu mode. Check 1 The Check Menu is displayed. Check 2 Alarm History Display (2) Select “Alarm History Display”...
Page 36 TROUBLESHOOTING (3) I.U./W.S. (O.U.) PCB Check (1) Press and hold “Menu” and “ECO” simultaneously for three seconds during the Check Menu normal mode. I. U./O. U. PCB Check Check Menu is displayed. Self Checking (2) Select “I.U./W.S. (O.U.) PCB Check” from the Check Menu and press “OK”.
Page 37 TROUBLESHOOTING (4) Self-Checking Self-Checking checks the wired controller and clears EEPROM (storage cell inside of the wired controller). (1) Press and hold “Menu” and “ECO” simultaneously for three seconds during the normal mode (when Check Menu unit is not operating). I.
Page 38 TROUBLESHOOTING (9) No Function This function is not used. 07: No Function Press “OK” to proceed. 08: Transmission Test Self Checking 0 7 : 0 0 0 (10) Communication (Transmission) Circuit Test The wired controller automatically starts to check the communication circuit. (11) Wired Controller Thermistor Test The detected temperature by the wired controller Self Checking...
Page 39 TROUBLESHOOTING (5) Contact Information Registration Contact information can be registered from “Contact Information”. (1) Press and hold “Menu” and “Back/Help” simultaneously for at least three seconds during the normal mode (when unit is not operating). The Test Run Menu is displayed. (2) Select “Contact Information”...
Page 40: Checking Using 7-Segment Display
TROUBLESHOOTING 3.1.5 Checking Using 7-Segment Display Only an authorized person can check using this method. ● Before Checking 1) Turn ON the main power supply. Wait for more than 20 seconds to start checking. 2) Checking Items * Expansion Valve Opening * Temperature Readings from Thermistors * Number of Indoor Units Connected in the Same System 3) Check the locations of 7-segment and push switches.
Page 41 TROUBLESHOOTING ● Simple Checking using 7-Segment Display 1 * Turn on All Indoor Units * All the Indoor Units Connected in the Same System 2 Turn on the Water Source Unit 3 Auto-addressing Starts During auto-addressing, the following items can be checked using the water source unit's on-board 7-segment LED display Water Source Unit (1) Disconnection of power supply to the indoor unit.
Page 42 TROUBLESHOOTING ● Checking Method Using Checking Mode Operating conditions and each part of a system can be checked using the 7-segment display on PCB1 in the water source unit. Arrangement of Push Switches NOTES: PSW2 1. Change the Indication Group by pressing PSW5 ( ) and PSW3 ( ). The first indication of the next or the previous Indication Group will be indicated no matter where the current step is at.
Page 43 TROUBLESHOOTING (B) Water Source Unit Information Select that the water source unit number display only for Unit A (No.0). When the selection is changed, press PSW3 (►) to move forward or PSW5 (◄) to move backward. Select the water source unit number for menu selection. Press PSW4 (▼) for detailed information of selected unit number.
Page 44 TROUBLESHOOTING Display Details 7-Segment Display Item Details SEG2 SEG1 Liquid Stop Valve Indication of Thermistor Open Circuit: -197 (-127) Temperature (Tchg) Indication of Thermistor Short Circuit: 260 ( 127) Subcooling Heat Exchanger Indication of Thermistor Open Circuit: -197 (-127) Temperature (Tsc) Indication of Thermistor Short Circuit: 260 ( 127) 20 Inverter Temperature 1 21 Inverter Temperature 2...
Page 45 TROUBLESHOOTING (C) Indoor Unit Information This information is indicated at main water source unit (Unit A) only. Select the indoor unit number for the information indication. Press PSW4 (▼) to move forward or PSW2 (▲) to move backward. The information is displayed alternately as “Item” → “Details”. NOTE: Unit No.
Page 46 TROUBLESHOOTING (E) Alarm Code History Information This information is indicated at main water source unit (Unit A) only. 7-Segment If a history of abnormality exists, it is indicated up to a maximum of Display Data No. 15 instances in chronological order. SEG2 SEG1 Press PSW4 (▼) to move forward or PSW2 (▲) to move backward.
Page 47: Checking Alarm Code History
TROUBLESHOOTING 3.1.6 Checking Alarm Code History Alarm code history is indicated in the following order while the Check Mode is displayed. “no01” (latest) history data ~ “no15” (oldest) history data Refer to the figure below as an example. Subject compressor when alarm/retry code is displayed. (Example: (H,Y)VWHR216B(3,4)2S) Alarm code history displays a maximum Water Source Unit A...
Page 48 TROUBLESHOOTING (1) Register of Alarm Code History Cause of Details of Alarm Code History Stoppage Alarm Code (Alarm Code Contents Abnormal Time Alarm W.S. Comp. No. or Stoppage Data Unit No. Inverter PCB No. Code) Accumulated ○ ○ Activation of protection device Time Abnormality transmitting between indoor units and Accumulated...
Page 49 TROUBLESHOOTING Cause of Details of Alarm Code History Stoppage Alarm Code (Alarm Code Contents Abnormal Time Alarm W.S. Comp. No. or Stoppage Data Unit No. Inverter PCB No. Code) Accumulated ○ Time Abnormality of low-pressure increase Accumulated ○ d1-12 Time Accumulated ○...
Page 50 TROUBLESHOOTING (2) Deletion of Alarm Code History Press PSW1 and PSW3 for five seconds to clear the alarm code history while the history data is displayed. (All history can be deleted.) PSW4(▼) PSW2(▲) In order to delete all the history, press PSW1 and PSW3 ( ) for PSW4(▼) PSW2(▲)
Page 51: Activation Of Protection Device
TROUBLESHOOTING (A) Protection Control Code The control information during operation are displayed. The protection control code is different from the code displayed during unit operation stoppage. Code Protection Control Code Retry Control Pressure Ratio Protection Pressure Ratio Decrease Retry High Pressure Increase Protection Low Pressure Increase Retry Inverter Current Protection High Pressure Increase Retry...
Page 52 TROUBLESHOOTING Code Category Content of Abnormality Leading Cause Abnormality of Indoor Fan Motor (Step-Out), Abnormality of Indoor Fan System Indoor Fan Controller Failure Indoor Fan Motor Activation of Protection Device for Fan Motor Overheat, Lockup Indoor Fan Abnormality of Fan Controller Fin Abnormality of Fin Thermistor or Fan Controller, Temperature Heat Exchanger Clogging, Abnormality of Fan Motor...
Page 53 TROUBLESHOOTING Code Category Content of Abnormality Leading Cause Detection of External Abnormality Input Signal by External Abnormality Detection Setting External Input Insufficient Water Flow Rate, Flow Switch Failure, Flow Switch Abnormality Incorrect Wiring of Flow Switch Incorrect Setting of Unit Model Incorrect Setting of Indoor Unit Model Code Incorrect Setting of Unit and...
Page 54 TROUBLESHOOTING ● Stoppage Condition of d1-07 (Operation Stoppage due to High/Low Entering Water Temperature) Water source unit is prohibited to operate due to high/low entering water temperature as shown below. NOTES: 1. If entering water temperature (Ta) is 118 F (48 C) or more/43 F (6 C) or less before starting compressor...
Page 55: Checking Using Service Checker
TROUBLESHOOTING 3.1.7 Checking Using Service Checker (1) Service Checker Display Items Items in the following table can be identified from the service checker. Water Source Unit Information Indication Description Alarm Date Alarm Detection Date Alarm Time Alarm Detection Time Alarm REC No. Data Record No.
Page 56 TROUBLESHOOTING Water Source Unit Information Indication Description Inverter Current Protection Control (Pc3) Y52C1 Relay for Inverter Compressor 1 (RY1) Y52C2 Relay for Inverter Compressor 2 (RY2) Relay for Crankcase Heater 1 Relay for Crankcase Heater 2 Y211 Relay for Reversing Valve 1 (RVR1) Y212 Relay for Reversing Valve 2 (RVR2) 20A1...
Page 57 TROUBLESHOOTING (2) Alarm Log Tracking Function of Service Checker This function works with compatible service checker PSH-4 connected to Control PCB of water source unit. Recorded alarm log data of water source unit can be collected. Refer to the manuals of service checker for details. ●...
Page 58 TROUBLESHOOTING Water Source Unit Information Indication Description Subcooler Temp. ( Evaporation Liquid Line Temp. (Te) ( Tchg Liquid Stop Valve Temp. ( Entering Water Temp. (Ta) ( Tfin1 Inverter 1 Temp. (Tf1) ( Tfin2 Inverter 2 Temp. (Tf2) ( Evaporation Gas Line Temp. (Tg) ( Temp.
Page 59: Emergency Operation
TROUBLESHOOTING 3.1.8 Emergency Operation (1) Emergency Mode Operation from Wired Controller ((H,Y)VWH(P,R)144B(3,4)2S to (H,Y)VWH(P,R)216B(3,4)2S) If the compressor fails, an emergency operation mode is accessible by the wired controller. Even if the compressor fails, some air conditioning operation is continuously available until troubleshooting is performed.
Page 60 TROUBLESHOOTING • Emergency operation is available only when the alarm codes above (*) are indicated. • The emergency operation is not available for malfunction of the inverter PCB. • This emergency operation is not a normal operation but a temporary operation until qualified service personnel arrive. If the alarm is indicated again during the emergency operation, the alarm cannot be canceled.
Page 61 TROUBLESHOOTING ● 208/230V Type ● 460V Type INV1 INV2 INV1 INV2 PCB1 PCB1 (A) Part (B) Part Inverter PCB (INV1 or INV2) Water Source Unit PCB (PCB1) SEG2 SEG1 C131 Inverter Compressor 1 Failure C130 C119 C121 DSW5 PSW2 PSW1 PSW3 PSW5 DSW5...
Page 62: Troubleshooting Procedures
TROUBLESHOOTING Troubleshooting Procedures l Alarm Code Indication of Wired Controller < CIW01 > (1) Refrigerant Cycle No. (1) (2) (2) Indoor Unit No. (3) Alarm Code 01-02 (4) Unit Model Code Alarm Code: (5) Total Number of Indoor Units in the Same System as the Indoor Unit Having Trouble MODEL : F .08 AlarmRst...
Page 63: Troubleshooting Using Alarm Codes
TROUBLESHOOTING 3.2.2 Troubleshooting Using Alarm Codes Alarm Activation of Protection Device (Float Switch) in Indoor Unit Code l The RUN indicator (red) flashes. l The indoor unit number (Ref. system number - I.U. number), the alarm code, the model code , the model name and the number of connected indoor units are displayed on the LCD.
Page 64 TROUBLESHOOTING Action Event Cause Check Item (Turn OFF Main Switch) Clogging of High Drainage Check condensate pan. Remove foreign Activation of Condensate Up-Slope Check drainage by particles clogging Float Switch Level Condensate pouring water. condensate pipe. Piping Check continuity Replace float switch Failure when condensate if faulty.
Page 65 TROUBLESHOOTING Alarm Activation of Protection Device in Water Source Unit Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 66 TROUBLESHOOTING ■ 460V Type W.S. PCB: Water Source Unit PCB (PCB1) Are connectors in Attach the connectors correctly. the table 2 connected correctly? Do connectors in Is the terminal correctly the table 2 have continuity connected to the high pressure Connect the terminals correctly. when the water source switch on the discharge pipe? unit stops operating.
Page 67 TROUBLESHOOTING Alarm Abnormal Communication between Indoor Units and Water Source Units Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB.
Page 68 TROUBLESHOOTING W.S. PCB: Water Source Unit PCB (PCB1) I.U. PCB: Indoor Unit PCB for wall mounted (Model: TIWM006B21S to TIWM030B21S) Is SW1 of PCB set to “ ” Set it correctly. (Nonpolar Setting)? Is LED3 (yellow) Is LED3 (yellow) ON even if connector Faulty I.U.
Page 69 TROUBLESHOOTING Action Event Cause Check Item (Turn OFF Main Switch) Measure voltage with Power Failure of No Power Supply Supply power. tester. Remove cause of Check for breakage short circuit. Short Circuit between Wires of insulation. Replace fuse and/or I.U./W.S. PCB if faulty. Blown Fuse for Power Supply Remove cause of...
Page 70 TROUBLESHOOTING 1: If the end terminal resistance (DSW10) is set to OFF for H-LINK connection, set the end terminal resistance to ON when CN2 is disconnected. Set the end terminal resistance to OFF when CN2 is reconnected. 2: Communication setting for the wall mounted (Model: TIWM006B21S to TIWM030B21S): SW1 SW1 for communication on the indoor unit PCB is set to Item Setting Position...
Page 71 TROUBLESHOOTING Alarm Abnormal Communication between Inverter PCB and Water Source Unit PCB Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code, the water source unit number of abnormal inverter PCB and abnormal inverter PCB number are displayed on the 7-segment display of the water source unit PCB.
Page 72 TROUBLESHOOTING ■ 460V Type W.S. PCB: Water Source Unit PCB (PCB1) Is LED2 (green) on Disconnect CN14 W.S. PCB flashing? of W.S. PCB Check limiting resistance of incoming current. Check the inverter Is LED2 (green) on (INV). W.S. PCB flashing? The connectors between inverter PCB (INV) and LED203 on the reactor (DCL) are correct.
Page 73 TROUBLESHOOTING Action Event Cause Check Item (Turn OFF Main Switch) Disconnect Between W.S. PCB Check continuity of Replace or repair Wires, and Inverter PCB wires. wires, tighten screws Locate Failure or Check for loose and/or correct wiring Incorrect connections screws. Power Supply Wiring location.
Page 74 TROUBLESHOOTING Alarm Abnormality of Power Supply Phase Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 75 TROUBLESHOOTING Abnormal Inverter Voltage Alarm Code (Insufficient Inverter Voltage or Overvoltage) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code, the water source unit number of abnormal inverter PCB and abnormal inverter PCB number are displayed on the 7-segment display of the water source unit PCB.
Page 76 TROUBLESHOOTING ■ 460V Type Restart operation. Check wiring and Is the power supply voltage 460V+10%? wire sizes. Is the power supply voltage more than 391V? Does the voltage fall during operation when other equipment or devices are powered on? Frequency can increase higher than 60Hz.
Page 77 TROUBLESHOOTING Alarm Decrease in Discharge Gas Superheat Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 78 TROUBLESHOOTING Action Event Cause Check Item (Turn OFF Main Switch) Refrigerant piping and Check refrigerant piping communication cable do not and communication Repair cable correctly. match within the same cable. refrigerant system group. Check operating Charge correct amount Overcharged Refrigerant pressures.
Page 79: Increase In Discharge Gas Temperature At The Top Of Compressor D1-15
TROUBLESHOOTING Alarm Increase in Discharge Gas Temperature at the Top of Compressor Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 80 TROUBLESHOOTING Action Event Cause Check Item (Turn OFF Main Switch) Refrigerant piping and Check refrigerant piping communication cable do not and communication Repair cable correctly. match the same refrigerant cable. system group. Charge correct amount Undercharge of Refrigerant Check pressures. of refrigerant.
Page 81 TROUBLESHOOTING Alarm Water Temperature Abnormality Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 82 TROUBLESHOOTING Action Event Cause Check Item (Turn OFF Main Switch) Check the Additional Charge correct amount Insufficient Refrigerant Refrigerant Charge of refrigerant. Calculation Check expansion valve. Replace expansion Faulty Expansion Valve valve if faulty. (Refer to Section 4.2.1.7.) Check outlet temp. of Replace solenoid valve Faulty Solenoid Valve (SVB) solenoid valve (SVB).
Page 83 TROUBLESHOOTING Abnormality of Thermistor for Indoor Unit Inlet Air Temperature Alarm Code (Inlet Air Thermistor) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The indoor unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 84 TROUBLESHOOTING Abnormality of Thermistor for Indoor Unit Outlet Air Temperature Alarm Code (Outlet Air Thermistor) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The indoor unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 85 TROUBLESHOOTING Abnormality of Thermistor for Liquid Refrigerant Pipe Temperature Alarm Code at Indoor Unit Heat Exchanger (Freeze Protection Thermistor) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The indoor unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 86 TROUBLESHOOTING Abnormality of Thermistor for Gas Refrigerant Pipe Temperature Alarm Code at Indoor Unit Heat Exchanger (Gas Pipe Thermistor) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD.
Page 87 TROUBLESHOOTING Abnormality of Thermistor for Outside Air Temperature Alarm Code (for Ducted (Medium Static) with EconoFresh Kit) l The RUN indicator (red) flashes. l The indoor unit number and the alarm code are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. This alarm code is displayed when a short (0.24kΩ or less) or open sensor (840kΩ or more) is detected during a heating or cooling operation.
Page 88 TROUBLESHOOTING Abnormality of Remote Thermistor Alarm Code (for DOAS Unit) l The RUN indicator (red) flashes. l The indoor unit number and the alarm code are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. This alarm code is displayed when a short (0.24kΩ or less) or open sensor (840kΩ or more) is detected during a heating, cooling or fan operation.
Page 89 TROUBLESHOOTING Abnormality of Thermistor for Controller Alarm Code (for DOAS Unit) l The RUN indicator (red) flashes. l The indoor unit number and the alarm code are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. This alarm code is displayed when a short (0.24kΩ or less) or open sensor (840kΩ or more) is detected during a heating or cooling operation.
Page 90 TROUBLESHOOTING Activation of Protection Device for Indoor Fan Motor Alarm Code (Indoor Unit with DC Motor) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The indoor unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 91 TROUBLESHOOTING ● Example of 4-Way Cassette Type PC4-No.2 LED5 VDC- VCC15 GND VCC05 VCC13 Checking for Fan Motor Remove fan motor connector and measure the resistance value between each of the pins (twice, one measurement with +/- leads and the other with -/+ leads). Check whether the resistance value is over or not according to the table shown below. When performing the second measuring, make sure to switch leads (Red/ Black).
Page 92 TROUBLESHOOTING Activation of Protection Device for Indoor Fan Motor Alarm Code (Ducted (Medium Static and Slim) Type) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The indoor unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 93 TROUBLESHOOTING ● Ducted Medium Static Type PCB2 LED1 CN201 PCN201 Checking for Fan Motor Remove fan motor connector and measure the resistance value between each of the pins (twice, one measurement with +/- leads and the other with -/+ leads). Check whether the resistance value is over or not according to the table shown below. When performing the second measuring, make sure to switch leads (Red/ Black).
Page 94 TROUBLESHOOTING Activation of Protection Device for Indoor Fan Motor Alarm Code (Wall Mount Type) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The indoor unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Page 95 TROUBLESHOOTING ● Wall Mount Type GND1 PCN550 PC4-No.2 VCC12 VCC15 VCC05 LED1 VDC- PCN500 Checking for Fan Motor Remove fan motor connector and measure the resistance value between each of the pins (twice, one measurement with +/- leads and the other with -/+ leads). Check whether the resistance value is over or not according to the table shown below. When performing the second measuring, make sure to switch leads (Red/ Black).
Page 96 TROUBLESHOOTING Activation of Protection Device for Indoor Fan Motor Alarm Code ( Indoor Unit with AC Motor ) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number ), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD.
Page 97: Abnormality Of High Pressure Sensor
TROUBLESHOOTING Alarm Abnormality of High Pressure Sensor for Water Source Unit Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when output voltage of the pressure sensor decreases to 0.1V or less, or increases to 4.9V or more during operation. W.S. PCB: Water Source Unit PCB (PCB1) Is connector CN7 Connect it correctly. of W.S. PCB abnormal? Is 5 VDC applied between #1 and #3 of connector Failure of W.S. PCB CN7 of W.S.
Page 98 TROUBLESHOOTING Abnormality of Thermistor for Discharge Gas Alarm Code Temperature on the Top of Compressor l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code and the water source unit number/compressor number with an abnormal thermistor are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when a short sensor for one minute (0.9kΩ or less) or open sensor (5946kΩ or more) is detected for a second time during operation. W.S. PCB: Water Source Unit PCB (PCB1) Is setting of DSW2 Set it correctly. on W.S. PCB correct? Thermistor Model (THM8) (THM9) (H,Y)VWH(P,R)072 - 120B(3,4)2S ▬ Are thermistors THM8 (H,Y)VWH(P,R)144 - 216B(3,4)2S and THM9 (for discharge gas temp.) connected to Connect them.
Page 99 TROUBLESHOOTING Abnormality of Thermistor for Evaporating Temperature Alarm Code during Heating Operation (Water Source Unit Evaporating Thermistor) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code and the water source unit number/compressor number with an abnormal thermistor are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm is displayed when a short (0.2kΩ or less) or open sensor (840kΩ or more) is detected for eight minutes during operation. Thermistor Symbol Are thermistors connected to (( ): Connector No.) THM connector on W.S. PCB Connect them. Model (right table)? Tchg (THM10) (THM11) (THM17) (THM23) (H,Y)VWH(P,R)072 - 120B(3,4)2S (H,Y)VWH(P,R)144 Is resistance of thermistors...
Page 100: Abnormality Of Thermistor For Water Source Unit Heat Exchanger Gas Pipe (Tg)
TROUBLESHOOTING Abnormality of Thermistor for Water Source Unit Heat Exchanger Gas Pipe Alarm Code (Tg) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm is displayed when a short (0.2kΩ or less) or open sensor (840kΩ or more) is detected for eight minutes during operation. Tg: Thermistor for Water Source Gas Pipe Is thermistor connected to W.S. PCB: Water Source Unit PCB (PCB1) Connect it. THM12 (Tg) on W.S. PCB? Is resistance of thermistors THM12 between 0.2kΩ and Failure of Thermistor 840kΩ? Refer to "Alarm Code 24"...
Page 101: Abnormality Of Low Pressure Sensor
TROUBLESHOOTING Alarm Abnormality of Low Pressure Sensor for Water Source Unit Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when output voltage of the pressure sensor decreases to 0.1V or less or increases to 4.9V or more during operation. W.S. PCB: Water Source Unit PCB (PCB1) Is connection CN8 Connect it correctly. of W.S. PCB abnormal? Is 5 VDC applied between #1 and #3 of connector Failure of W.S. PCB CN8 of W.S.
Page 102 TROUBLESHOOTING Abnormality of Thermistor for Entering Water Temperature Alarm Code (Water Source Unit Entering Water Thermistor) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when a short (0.2kΩ or less) or open sensor (840kΩ or more) is detected during operation. W.S. PCB: Water Source Unit PCB (PCB1) Is thermistor THM7 connected to THM7 Connect them. (Ta, color: red) of W.S. PCB? Is resistance of THM7 Failure of between 0.2kΩ...
Page 103 TROUBLESHOOTING Alarm Abnormality of Electrical Box Thermistor Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when a short (0.2kΩ or less) or open sensor (840kΩ or more) is detected during operation. W.S. PCB: Water Source Unit PCB (PCB1) Electrical Box Thermistor (THM14) (Attached on Inner Upper Side Is thermistor THM14 of Electrical Box) connected to THM14 Connect them. (Ts, color: white) of W.S.
Page 104: Incorrect Connection Of Change-Over Box
TROUBLESHOOTING Alarm Incorrect Connection of Change-Over Box Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when the Generation 1 change-over boxes are connected to the refrigerant cycle system. 3-84 SM-18006...
Page 105 TROUBLESHOOTING Alarm Incorrect Capacity Setting of Water Source Unit and Indoor Unit Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. 1. This alarm code is displayed when the capacity setting DIP switch, DSW2, on the water source unit PCB, is not set (all the settings from #1 to #6 are OFF) or set incorrectly. 2. This alarm code is displayed when the total indoor unit capacity exceed the connectable indoor unit capacity ratio of water source unit. W.S. PCB: Water Source Unit PCB (PCB1) I.U. PCB: Indoor Unit PCB Are #1-#6 of DSW2 on Set capacity of W.S. PCB. W.S. PCB set incorrectly? Are #1-#4 of DSW3 on Set capacity of I.U.
Page 106: Incorrect Indoor Unit No. Setting
TROUBLESHOOTING Alarm Incorrect Indoor Unit No. Setting Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed five minutes after power-on of the water source unit, if the indoor unit number set by DSW6 and RSW1 duplicates in the same refrigerant group. Note 2: RSW2 for Generation 2 Ducted type. 3-86 SM-18006...
Page 107: Abnormality Of Picking Up Circuit For Protection In Water Source Unit
TROUBLESHOOTING Alarm Abnormality of Picking up Circuit for Protection in Water Source Unit Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code, the water source unit number of abnormal inverter PCB, and abnormal PCB number are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when DC 13V is applied to connector (refer to the table) at the time operation command is transmitted to inverter compressor (approx. 5 sec. after turning ON the controller. For troubleshooting, make sure to connect PCN2, Water Source Unit CN5, and CN6 to the connectors before attaching 208/230V 460V Type the tester as indicated in the figure. Main Power PCB Inverter PCB If PCN2 is not connected to the connector when (MPB) (INV) attach the tester, DC13V is continuously detected Connector PCN2 PCN2 and end in checking failure. Pin No. #1, #3 #4, #6 #4, #5 #1, #3 ■ 208/230V Type W.S. PCB: Water Source Unit PCB (PCB1)
Page 108 TROUBLESHOOTING ■ 460V Type W.S. PCB: Water Source Unit PCB (PCB1) Is wiring between PCN2 of inverter PCB (INV) and Connect correctly. high pressure switch (PSH) connected correctly? Is voltage applied between #1 and #3 of PCN2 on inverter PCB (INV) approx. DC13V when transmit the operation Faulty Inverter PCB (INV).
Page 109 TROUBLESHOOTING Alarm Activation of Low Compression Ratio Protection Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when the following condition occurs more than twice in an hour. Compression ratio ε = {(Pd + 14.5 psi (0.1 MPa)) / (Ps + (8.7 psi (0.06 MPa))}, calculated from a discharge pressure (Pd) and suction pressure (Ps) is lower than 1.8. W.S. PCB: Water Source Unit PCB (PCB1) Does inverter operate? Check inverter. Check compressor and Does compressor operate? power cable. Is reversing valve spindle Replace reversing valve if faulty. installed at middle position? Are high pressure sensor and Replace high pressure sensor...
Page 110 TROUBLESHOOTING Alarm Activation of Low Pressure Increase Protection Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. If the suction pressure (Ps) of the compressor is more than 203 psi (1.4 MPa) for a minute, all the compressors stop. The operation automatically restarts after three minutes. If this occurs again twice in the next 30 minutes, this alarm code is displayed. W.S. PCB: Water Source Unit PCB (PCB1) Is there leak from Replace solenoid valve (SVA) solenoid valve (SVA)? if faulty. Is the reversing valve internal Replace reversing valve if faulty. slide not fully shifted? Replace low pressure sensor Is low pressure sensor normal?
Page 111 TROUBLESHOOTING Alarm Activation of High Pressure Increase Protection Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. If the discharge pressure (Pd) of the compressor is more than 551 psi (3.8 MPa) for two seconds, all the compressors stop. The operation automatically restarts after three minutes. If this occurs again twice in the next 30 minutes, this alarm code is displayed. W.S. PCB: Water Source Unit PCB (PCB1) I.U. PCB: Indoor Unit PCB Is there leakage from Replace solenoid valve (SVA) solenoid valves (SVA)? if faulty. Is water source unit stop valve Open stop valve.
Page 112 TROUBLESHOOTING Activation of Low Pressure Decrease Protection Alarm Code (Vacuum Operation Protection) l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code is displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. If the suction pressure (Ps) of the compressor is less than 13 psi (0.09 MPa) for 12 minutes, the compressor stops. If this occurs again twice in the next 60 minutes, this alarm code is displayed. W.S. PCB: Water Source Unit PCB (PCB1) I.U. PCB: Indoor Unit PCB Is amount of refrigerant correct? Correctly charge refrigerant. Is water source stop valve open? Open the stop valve. Is refrigerant leaking? Repair leaks.
Page 113 TROUBLESHOOTING Action Event Cause Check Item (Turn OFF Main Switch) Check charged ref. Repair leakage and Shortage of Refrigerant volume or check for correctly charge ref. leakage. Closed Stop Valve Check stop valve. Open stop valve. Abnormal Low or High Check connector Replace pressure Pressure Sensor...
Page 114 TROUBLESHOOTING Alarm Activation of Inverter Overcurrent Protection Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code, the water source unit number of abnormal inverter PCB, and abnormal inverter PCB number are displayed on the 7-segment display of the water source unit PCB. Check the inverter stoppage code when this alarm code is displayed. Note 1: Except for some models. This alarm code is displayed when the inverter electronic thermal protection is activated six times within 30 minutes. If this occurs less than six times in 30 minutes, the operation is automatically retried. Conditions of Activation: (1) Inverter current with 105% of the rated current runs for 30 seconds continuously. (2) Inverter current runs intermittently and the accumulated time reaches up to three minutes, in 10 minutes. W.S. PCB: Water Source Unit PCB (PCB1) Which is cause of stoppage "2" " " of troubleshooting Refer to next page. by 7-segments display, "2"...
Page 115 TROUBLESHOOTING ■ 208/230V Type From Previous Page Turn OFF power and Restart operation. disconnect U, V, W from Faulty Does the water compressor terminals. Check inverter Replace inverter source unit Turn ON #1 of DSW101 PCB (INV) PCB (INV). stop before the on inverter PCB (INV) to compressor start? cancel 0A detection and...
Page 116 TROUBLESHOOTING ■ 460V Type From Previous Page Turn OFF power and Restart operation. disconnect U, V, W from Faulty Does the water compressor terminals. Check inverter Replace inverter source unit Turn ON #1 of DSW101 PCB (INV) PCB(INV). stop before the on inverter PCB (INV) to compressor start? cancel 0A detection and Normal...
Page 117 TROUBLESHOOTING Alarm Abnormality of Current Sensor for Inverter Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code, the water source unit number of abnormal inverter PCB, and abnormal inverter PCB number are displayed on the 7-segment display of the water source unit PCB. Check the inverter stoppage code when this alarm code is displayed. Note 1: Except for some models. In an instance where abnormal current sensor (0A detecting) occurs three times within 30 minutes, this alarm code is displayed. If this occurs less than three times in 30 minutes, the operation automatically restarts. Condition of Activation: After phase positioning is completed, the running current for the phase positioning is lower than criterion value. Restart operation. Inverter PCB (INV) is Compressor stops faulty. immediately at approx.18Hz. Replace it. How is compressor operation when restarted? Compressor does not operate.
Page 118 TROUBLESHOOTING Alarm Inverter Error Signal Detection Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code, the water source unit number of abnormal inverter PCB, and abnormal inverter PCB number are displayed on the 7-segment display of the water source unit PCB. Check the inverter stoppage code when this alarm code is displayed. Check the inverter stoppage code when this alarm code is displayed. Note 1: Except for some models. The inverter PCB has the abnormality detection function. This alarm is displayed when any of the following conditions is met seven times in 30 minutes. If this occurs less than seven times in 30 minutes, the operation automatically restarts. Condition of Activation: (1) An abnormal current is applied to the inverter PCB due to a short circuit, a ground fault or overcurrent. (2) The temperature at inverter PCB increases abnormally. (3) The control voltage decreases. (4) The angle difference between the shaft in compressor and the shaft in the control program exceeds 60°. (It stops after the compressor start.) Does the water source unit stop the operation before Refer to next page.
Page 119 TROUBLESHOOTING ■ 208/230V Type From Is supply voltage W.S.: Water Source Unit Previous AC 208/230V+10%? I.U.: Indoor Unit Page Check capacity and wiring of Is voltage higher than 177V during operation? power supply. Is voltage higher than 177V at any time? Is compressor running current same as operating current? Is crankcase Restart operation...
Page 120 TROUBLESHOOTING ■ 460V Type From Is supply voltage W.S.: Water Source Unit Previous AC 460V+10%? I.U.: Indoor Unit Page Check capacity and wiring of Is voltage higher than 391V during operation? power supply. Is voltage higher than 391V at any time? Is compressor running current same as operating current? Is crankcase Restart operation...
Page 121 TROUBLESHOOTING Position of Surge Absorber ■ 208/230V Type ■ 460V Type NF151Q NF161Q NFT-025A25-HHA0 NFT-040A25-HHA0 H7B04936A-D H7B04937A-D DC 500V 40A DC 500V 63A DC 500V 40A DC 500V 63A Surge Absorber (SA) Surge Absorber (SA) 3-101 SM-18006...
Page 122 TROUBLESHOOTING Alarm Abnormal Inverter Temperature Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code, the water source unit number of abnormal inverter PCB, and abnormal inverter PCB number are displayed on the 7-segment display of the water source unit PCB. Check the inverter stoppage code when this alarm code is displayed. Note 1: Except for some models. If the temperature of the radiation plate thermistor exceeds 223 ~ 232°F (106 ~ 111 C) three times in 30 minutes, this alarm code is displayed. If this occurs less than three times in 30 minutes, the operation is automatically retried. Does the water source unit Replace inverter PCB stop the operation before (INV). the compressor start? Are the screws for securing Secure screws correctly.
Page 123 TROUBLESHOOTING Alarm Inverter Failure Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The alarm code, the water source unit number of abnormal inverter PCB, and abnormal inverter PCB number are displayed on the 7-segment display of the water source unit PCB. Check the inverter stoppage code when this alarm code is displayed. Note 1: Except for some models. An abnormality is detected when the actual frequency from the inverter PCB is less than 10Hz after the inverter frequency is output from the water source unit PCB to the inverter PCB. This alarm code is displayed when this occurs three times in 30 minutes. If it occurs less than three times in 30 minutes, the operation is automatically retried. Conditions of Activation: Inverter PCB does not operate normally. ■ 208/230V Type Turn OFF power (LED501 OFF) Inverter PCB (INV) is normal. and restart operation. Inverter Stoppage Code Check noise filter. Is alarm code “55” indicated again? Replace inverter PCB.
Page 124 TROUBLESHOOTING Alarm External Abnormality Detection Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when the external input is set the control function No.14 is detected an abnormality (input terminals are short-circuited). Alarm Flow Switch Abnormality Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. (1) If water flow switch is OFF (open) while the water source unit is operating. This alarm code is displayed when the external input CN17 connected to water flow switch detect an abnormality (input terminals are open-circuited) while the water source unit is operating. Water flow switch should be turned ON (close) in 240sec. or less after water source unit starts operation. (2) If water flow switch is ON (close) while the water source unit is stopped. This alarm does not occur with DIP switch setting before shipment. This alarm is available only when DSW5-No.5 “Cancelation of Flow Switch Detection during Water Source Unit Stoppage” is turned OFF. Alarm Incorrect Setting of Indoor Unit No. Setting Code...
Page 125 TROUBLESHOOTING Alarm Incorrect Change-Over Box Connection Code l The RUN indicator (Red) flashes. l The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on the LCD, and the indoor unit number and the alarm code are displayed on the 7-segment display of water source unit PCB. l LED (LED10, 11, 12, 13) on the change-over box PCB flashes. This alarm code is displayed when two or more change-over boxes are connected between water source unit and indoor unit. Is wiring connection between change-over boxes incorrectly Correctly connect the wiring connected to the terminal box and reset the power supply. (TB3 or TB4) for the indoor unit communication? Failure of Change-Over Box PCB • Alarm Code "C1" is displayed when the units are connected as follows.
Page 126 TROUBLESHOOTING Alarm Incorrect Indoor Unit Connection Number (Change-Over Box) Code l The RUN indicator (Red) flashes. l The indoor unit number, the alarm code (“35”), the unit model code and the connected number of indoor units are displayed on LCD of wired controller which is connected to the indoor unit with abnormal change-over box. l LED (LED10, 11, 12) on the change-over box PCB flashes. (For Multiple Branch Type Change-Over Box, only LED on PCBs with an abnormality flashes.) This alarm code is displayed when connected indoor units exceed maximum number to 1 branch of change-over box. Do connected indoor units exceed Correctly connect the wiring maximum number to 1 branch of and reset the power supply. change-over box. Failure of Change-Over Box PCB • Alarm Code "C2" is displayed when the units are connected as follows.
Page 127 TROUBLESHOOTING Alarm Incorrect Indoor Unit Refrigerant Number Setting (Change-Over Box) Code l The RUN indicator (Red) flashes. l The indoor unit number, the alarm code (“35”), the unit model code and the connected number of indoor units are displayed on LCD of wired controller which is connected to the indoor unit with abnormal change-over box. l LED (LED11, 12) on the change-over box PCB flashes. (For Multiple Branch Type Change-Over Box, only LED on PCBs with an abnormality flashes.) This alarm code is displayed when indoor unit with different refrigerant cycle group is connected to change-over box. Is wiring connection for Correctly connect the wiring change-over box incorrect? and reset the power supply. Is the refrigerant cycle group setting Set refrigerant cycle group for indoor unit connected to (RSW2, DSW5) correctly change-over box incorrect?
Page 128 TROUBLESHOOTING Alarm Incorrect Connection Port Setting (Change-Over Box) Code l The RUN indicator (Red) flashes. l The indoor unit number, the alarm code (“35”), the unit model code and the connected number of indoor units are displayed on LCD of wired controller which is connected to the indoor unit with abnormal change-over box. l LED (LED11, 12, 13) on the change-over box PCB flashes. (For Multiple Branch Type Change-Over Box, only LED on PCBs with an abnormality flashes.) This alarm code is displayed when communication cable for indoor unit is connected to a port of multiple branch type change-over box that is set to “unused”. Setting DSW2 for change-over box PCB is required if any ports are not in use with multiple branch type change-over box. NOTE: “03” alarm code is displayed when DSW2 is not set and indoor unit is not connected to change-over box. Change-over box and indoor unit are connected. Is the setting for DSW2 of Correctly set the DSW. change-over box PCB “unconnected”? Failure of Change-Over Box PCB • Alarm Code "C5" is displayed when DSW is set as follows.
Page 129 TROUBLESHOOTING Alarm Cooling Fan Abnormality Code l The RUN indicator (red) flashes. l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code the model name and the number of connected indoor units are displayed on the LCD. The water source unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB. Note 1: Except for some models. This alarm code is displayed when the electrical box temperature increases above 140 F (60 C) for 30 minutes while the water source unit is operating. ■ 208/230V Type Occurrence of Alarm Code “E4” High voltage is applied to electrical parts. Perform the check carefully to prevent an electrical shock. Check connectors PCN1 and PCN28 on W.S.
Page 130 TROUBLESHOOTING ■ 460V Type Occurrence of Alarm Code “E4” High voltage is applied to electrical parts. Perform the check carefully to prevent an electrical shock. Check connectors PCN1 and PCN28 on W.S. PCB. Is the power supply voltage Check wiring and wire sizes. 460V+10%? 1: Abnormal voltage is supplied Is the voltage between...
Page 131 TROUBLESHOOTING Alarm Compressor Protection Code This alarm code is displayed when any of the following alarms which could result in serious compressor damage occurs three times in six hours. While this alarm is displayed, alarm reset is not possible. Alarm Code: Information of Abnormality Activation of Protection Device in Water Source Unit Decrease in Discharge Gas Superheat Increase in Discharge Gas Temperature Abnormality of Running Current at Fixed Speed Compressor Activation of Low Compression Ratio Protection Device Activation of Low Pressure Increase Protection Device Activation of High Pressure Increase Protection Device Activation of Low Pressure Decrease Protection Device...
Page 132: Abnormalities Of Devices
TROUBLESHOOTING 3.2.3 Abnormalities of Devices Other Abnormalities of Devices Abnormalities If there is no abnormality (Alarm Code) displayed on the wired controller, and normal operation is not available, take necessary action according to the following procedures. Action Event Cause Check Item (Turn OFF Main Switch) Measure winding Open...
Page 133 TROUBLESHOOTING Other Abnormalities of Devices Abnormalities Action Event Cause Check Item (Turn OFF Main Switch) Check Setting Condition of "Thermistor of Wired Controller" with Optional Setting * Setting and Control "00": Control by Indoor Thermistor for If the thermistor of Suction Air Incorrect Optional wired controller...
Page 134 TROUBLESHOOTING Other Abnormalities of Devices Abnormalities Action Phenomenon Cause Check Item (Turn OFF Main Switch) Failure of Failure of Thermistor Replace or correctly Check thermistor in Discharge connect wires self-checking mode. Air Temp. Disconnected if abnormal. Thermistor Wire of Thermistor Indoor Fan Speed is Not Changed...
Page 135 TROUBLESHOOTING Other Abnormalities of Devices Abnormalities Action Event Cause Check Item (Turn OFF Main Switch) Discharge pressure does not increase higher than Check operation Add refrigerant. 319 psi (2.2MPa) due to pressure. insufficient refrigerant. Indoor Fan does Not Operate even when Disconnected Wire for Correctly connect wires.
Page 136: Procedures For Checking
TROUBLESHOOTING Procedures for Checking 3.3.1 Self-Checking of PCBs using Wired Controller Refer to Section 3.1.4 “Checking Wired Controller” 3.3.2 Self-Checking of Wired Controller Refer to Section 3.1.4 “Checking Wired Controller” 3-116 SM-18006...
Page 137: Test Run
TROUBLESHOOTING Test Run Turn OFF all the power supply switches. Use a tester and make sure that all the switches are turned OFF. Before the test run, check that the unit is appropriately installed according to the Installation and Maintenance Manual.
Page 138: Test Run For Water Piping
TROUBLESHOOTING 3.4.1 Test Run for Water Piping Before Test Run, make sure that the water piping work has been carried out in a proper manner. Especially, make sure that the water strainer, automatic air discharge valve and water flow switch are positioned at their correct places.
Page 139: Test Run Using Wired Controller (Ciw01)
TROUBLESHOOTING 3.4.2 Test Run Using Wired Controller (CIW01) Menu Button Menu On/Off (1) Turn ON the power supply of the indoor and water source units. Back/Help ECO (2) Set the TEST RUN mode with the wired controller. On/Off Back/Help Button Press and hold the "Menu"...
Page 140 TROUBLESHOOTING (4) Press “On/Off” button. Normal The test run operation is started. The operation mode, the airflow volume, the airflow direction and the test run time can be set on the Test Run screen. Select the item by pressing “ ”.
Page 141: Test Run From Water Source Unit Side
TROUBLESHOOTING 3.4.3 Test Run from Water Source Unit Side The procedures for the test run from the water source unit side are indicated below. Setting of this DIP switch is possible with the power supply ON. Setting of DIP Switch (Factory Setting) DSW4 Switch for Setting of Service Operation and Function 1.
Page 142 TROUBLESHOOTING DIP Switch Setting Operation Remarks 1. Setting 1. When DSW4-4 is ON during * Do not repeat compressor ON/OFF *Compressor Manual OFF: compressor operation, frequently. Set DSW4-4 ON. the compressor stops operating immediately and the indoor unit is under the condition of Thermo- OFF.
Page 143: Checking The Test Run
TROUBLESHOOTING 3.4.4 Checking the Test Run (1) Indoor and Water Source Fan Check that the indoor fan and water source cooling fan rotate correctly and the airflow is smooth. (2) Power Supply Voltage Check the power supply. Voltage Change If the power supply is abnormal, contact the electric power company.
Page 144: Checklist For Refrigerant System
TROUBLESHOOTING 3.4.5 Checklist for Refrigerant System The system data can be checked on the 7-segment display of the water source unit PCB during the test run and the troubleshooting. However, it may take time for checking because the operation cycle changes depending on the operating condition.
Page 145 TROUBLESHOOTING CHECKLIST FOR TEST OPERATION CLIENT: INSTALLER: DATE: W.S. MODEL: W.S. SERIAL NO.: CHECKER: I.U. Model I.U. Serial No. I.U.: Indoor Unit, W.S.: Water Source Unit Piping Length: feet Additional Refrigerant Charge: (1) General Check Item Result Are the power supply wire and the communication wire separate from refrigerant pipings? Is ground wire connected? Is there any short circuit?
Page 146 TROUBLESHOOTING (3) Check Item after Sampling Data a. Cooling Operation Check Item Standard Causes Result 1 Is the total of iE (I.U. Ex. Valves Opening) • Excessive abnormally low or high? Refrigerant • High Insufficient Refrigerant or Excessive Pipe Pressure Loss 2 Is TL (Liquid Pipe Temp.
Page 147: Reset For Accumulated Operation Time Of Compressor 1-2 (Cu1 - Cu2 ) ( : Water Source Unit No.)
TROUBLESHOOTING 3.4.6 Reset for Accumulated Operation Time of Compressor 1-2 (cU1 - cU2 ) ( : Water Source Unit No.) There are accumulated operation times of the compressor after maintenance and after starting operation. The following procedures show how to reset the accumulated operation time of the compressor after maintenance.
Page 148: Setting Of Forced Open Valve Mode
TROUBLESHOOTING 3.4.7 Setting of Forced Open Valve Mode This mode is utilized to simplify the refrigerant recovery work, refrigerant evacuation work and air tight test during servicing by fully opening the expansion valves of water source unit (MV1, MV3, MV4, MVB) and the expansion valve of indoor unit (MV), and opening the solenoid valves of water source unit (SVA, SVB).
Page 149 TROUBLESHOOTING NOTE: There might be the possibility that the refrigerant recovery work for water source unit (when exchange the cycle parts of water source unit, etc.) is not successfully completed if not activate the “Forced Open Valve Mode”. Make sure to activate this mode when conduct refrigerant recovery work for water source unit. (1) Applicable Unit Water Source Unit (Main Water Source Unit: Unit A) (2) Setting Procedure...
Page 151: Maintenance
MAINTENANCE 4. Maintenance SM-18006...
Page 152: Maintenance Of Water Source Unit
MAINTENANCE 4.1 Maintenance of Water Source Unit Apply the specified non-flammable refrigerant (R410A) to the water source unit in the refrigerant cycle. Do not charge materials other than R410A into the unit such as hydrocarbon refrigerants (propane or etc.), oxygen, flammable gases (acetylene or etc.) or poisonous gases when installing, maintaining and moving the unit.
Page 153: Attaching Service Cover And Front Cover
MAINTENANCE TURN OFF all POWER supply switches. 4.1.2 Attaching Service Cover and Front Cover (1) Attaching Front Cover Attach the front cover with the screws. (2) Attaching Service Cover (a) First attach the front cover, then attach the service cover. (b) Insert the front top part of service cover when attaching.
Page 154: Removing Upper Cover
MAINTENANCE TURN OFF all POWER supply switches. 4.1.3 Removing Upper Cover (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove screws attaching upper cover. (H,Y)VWH(P,R)072, 096, 120B(3,4)2S: 12 screws (H,Y)VWH(P,R)144, 168, 192, 216B(3,4)2S: 14 screws (3) Lift the upper cover vertically and remove it.
Page 155: Removing Rear Cover
MAINTENANCE TURN OFF all POWER supply switches. 4.1.4 Removing Rear Cover (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove six screws attaching rear cover.
Page 156: Removing Pipe Cover
MAINTENANCE TURN OFF all POWER supply switches. 4.1.5 Removing Pipe Cover (1) Removing Upper Pipe Cover (a) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (b) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (c) Remove three screws attaching upper pipe cover.
Page 157: Removing Side Cover
MAINTENANCE TURN OFF all POWER supply switches. 4.1.6 Removing Side Cover (1) Removing Side Cover R (a) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (b) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (c) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”.
Page 158 MAINTENANCE TURN OFF all POWER supply switches. (2) Removing Side Cover L (a) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (b) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (c) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”.
Page 159: Removing Electrical Box Cover
MAINTENANCE TURN OFF all POWER supply switches. 4.1.7 Removing Electrical Box Cover (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove four screws attaching electrical box cover. (3) Put your hand on the groove at the bottom of the electrical box cover. (4) Lift the electrical box cover upward and remove the cover from the hooks on the right and left sides of electrical box.
Page 160: Removing Electrical Box
MAINTENANCE TURN OFF all POWER supply switches. 4.1.8 Removing Electrical Box 4.1.8.1 Removing Radiation Plate from Inverter PCB NOTICE: ● Do not touch any electrical components while following LED on the PCB is ON. Current may be flowing in the components and cause electric shock. For 208/230V Type: LED501 (Red) of main power PCB (MPB) For 460V Type: LED401 (Red) of inverter PCB (INV)
Page 161: Removing Wiring And Disconnect Connectors
MAINTENANCE TURN OFF all POWER supply switches. 4.1.8.2 Removing Wiring and Disconnect Connectors (1) Remove the wiring from the cable clamps at the left side of the electrical box. (2) Remove the screws securing the power supply wiring (TB1), compressor wiring, transmission wiring (TB2), external input/output signal wiring (TB3), and ground wiring.
Page 162 MAINTENANCE TURN OFF all POWER supply switches. Tool Phillips Screwdriver 460V (H,Y)VWH(P,R)072 - 120B42S (H,Y)VWH(P,R)144 - 216B42S Inverter PCB Inverter PCB 4-12 SM-18006...
Page 163: Removing Electrical Box
MAINTENANCE TURN OFF all POWER supply switches. 4.1.8.3 Removing Electrical Box (1) Attach electrical box cover. (2) Remove five screws attaching electrical box. (3) Lift the electrical box upward and remove the hook on the foot of electrical box from the unit base. (4) Remove electrical box.
Page 164: Removing Compressor
MAINTENANCE TURN OFF all POWER supply switches. 4.1.9 Removing Compressor Recover the refrigerant by operating the compressor. In other instances, recover the refrigerant before starting the work, and turn OFF the power supply of the unit. NOTE: Do NOT touch the compressor or the high pressure refrigerant piping during operation or when immediately stopping the unit because of the high temperature.
Page 165 MAINTENANCE TURN OFF all POWER supply switches. (7) Release the bind lace of the soundproof cover for removal. NOTES: 1. When removing the soundproof cover, be careful not to deform the piping around the cover. The braze joint may become damaged due to pipe deformation. 2.
Page 166 MAINTENANCE TURN OFF all POWER supply switches. (9) Release the spring to remove the crankcase heater. Tool Long-nose Pliers Spring Crankcase Heater (10) Disconnect the discharge pipe and s-pipe from the compressor. Check that the pressure inside the pipe is equal to the atmospheric pressure. Cut the pipe at the closer position to the compressor from the braze joint.
Page 167 MAINTENANCE TURN OFF all POWER supply switches. (11) Disconnect the oil discharge pipe from the compressor. When disconnecting, pinch and cut the pipe at the closer position to the compressor from the braze joint, so that the refrigerant oil remaining inside the compressor does not spill from the oil discharge pipe.
Page 168 MAINTENANCE TURN OFF all POWER supply switches. (12) Remove four nuts securing the compressor and remove the compressor from the unit base. NOTES: 1. When removing the compressor, be aware that it does not come in contact with surrounding pipes. If contacted, pipes may become deformed.
Page 169 MAINTENANCE TURN OFF all POWER supply switches. (13) Take out the remaining refrigerant oil in the compressor from the discharge pipe, and measure the oil quantity. NOTES: 1. Additional refrigerant oil charge is required if: remaining refrigerant oil quantity in the old compressor is more than the pre-charged refrigerant oil in the new compressor 2.
Page 170 MAINTENANCE TURN OFF all POWER supply switches. (14) Mount the new compressor. When attaching the nut at the front side, pay attention not to deform the discharge piping. Perform the brazing according to the following order: (a) Oil Discharge Pipe (b) Discharge Pipe (c) S-Pipe NOTES:...
Page 171 MAINTENANCE TURN OFF all POWER supply switches. (15) Wind the crankcase heater around the compressor. Crankcase heater mounting position: Back to the original setting (Refer to Section 4.1.9 (9)) (16) Attach the soundproof cover. (17) Reconnect all wiring in the original positions. (a) The crankcase heater wiring is secured inside the soundproof cover with the tack(T) without coming in contact with the compressor power wiring and the piping.
Page 172 MAINTENANCE TURN OFF all POWER supply switches. (18) Perform the final check for wiring conditions by referring to the figure below. NOTE: Ensure that all wiring does not come in contact with the compressor, piping or plate edges. If there are contacts, wiring can damage or a fire can occur.
Page 173: Replacing Plate Heat Exchanger
MAINTENANCE TURN OFF all POWER supply switches. 4.1.10 Replacing Plate Heat Exchanger (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”.
Page 174 MAINTENANCE TURN OFF all POWER supply switches. (10) Draw out the heat exchanger assembly to the front side of unit. (11) Disconnect the HEX refrigerant inlet pipe and outlet pipe from plate heat exchanger. Remove the piping from the brazing part. (12) Remove four securing screws and disassemble the HEX plates. (13) Cover the new plate heat exchanger with HEX insulation. (14) Assemble in reverse order. NOTE: When applying the torch frame to pipe connections, protect the HEX insulation against burning. Tool Phillips Screwdriver, Torch Brazing Part HEX Insulation Heat Exchanger Assembly HEX Refrigerant Inlet Pipe HEX Plate Brazing Part HEX Plate HEX Refrigerant Outlet Pipe 4-24 SM-18006...
Page 175: Replacing Refrigerant Oil
MAINTENANCE TURN OFF all POWER supply switches. 4.1.11 Replacing Refrigerant Oil 4.1.11.1 Replacing Refrigerant Oil (No Clogging in Oil Return Pipe Assy) (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”.
Page 176 MAINTENANCE TURN OFF all POWER supply switches. (11) When the procedures have been completed, perform vacuuming again from (E) low pressure access port and recharge the refrigerant. After recharging, open the stop valves. NOTES: ● Use a clean charging hose. ● Charge the refrigerant oil in a short time (within approx. 20 minutes). Use a container with a small opening so that the refrigerant oil does not absorb the moisture in the atmosphere. Tool Adjustable Wrench or Ratchet (F) High Pressure Access Port (B) Low Pressure Gas Stop Valve (Only for Heat Recovery System) (A) High/Low Pressure Gas Stop Valve (C) Liquid Stop Valve (E) Low Pressure Access Port Accumulator (Cross Section)
Page 177: Replacing Refrigerant Oil (Clogging In Oil Return Pipe Assy) And Replacing Oil Return Pipe Assy
MAINTENANCE TURN OFF all POWER supply switches. 4.1.11.2 Replacing Refrigerant Oil (Clogging in Oil Return Pipe Assy) and Replacing Oil Return Pipe Assy In the case of replacing the oil return pipe assy only, the procedures (11) and (12) are not required. (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”.
Page 178 MAINTENANCE TURN OFF all POWER supply switches. (9) Cut off (G) oil return pipe assy with (I) s-pipe at the cutting position indicated in the figure. (10) Cut off (G) oil return pipe assy with oil separator at the point indicated in the figure. Remove (G) oil return pipe assy from the unit. Then, remove (J) brazing part of s-pipe inlet and the (L) brazing part of oil separator outlet port. NOTES: ● When cutting (K) (M) oil return pipes off, cut the closer curve part to (K) (M) oil return pipe to prevent the refrigerant oil remaining in (G) oil return pipe assy from spilling out. ● When cutting (G) oil return pipe assy off, do not use a tool that generates swarf such as a saw. ● After cutting off the (G) oil return pipe assy, remove the cut-off piping from the (L) brazing part of oil separator outlet port. ● When removing brazing part of (I) s-pipe and the (L) brazing part of oil separator outlet port, refrigerant oil may come out. Prepare the oil pan and such before the work to collect the refrigerant oil. Tool Adjustable Wrench or Ratchet, Oil Pan (H,Y)VWH(P,R)072, 096, 120B(3,4)2S (J) Brazing Part of S-Pipe Inlet (G) Oil Return Pipe Assy (I) S-Pipe (L) Brazing Part of...
Page 179 MAINTENANCE TURN OFF all POWER supply switches. (11) Connect a charging hose to the (L) brazing part of oil separator outlet port. Then, charge nitrogen (22 psi (0.15 MPa)) from (J) brazing part of s-pipe inlet and collect refrigerant oil in oil separator by applying pressure. NOTE: In the case that the unit has two (G) oil return pipe assy and two oil separators ((H,Y)VWH(P,R)144- 216B(3,4)2S), collect the refrigerant oil from one oil separator and then from the other. (12) Stop charging nitrogen after the refrigerant oil has completely been collected. Perform vacuuming from (E) low pressure access port and add the same quantity of oil as the collected refrigerant oil from (D) access port for collecting refrigerant oil. NOTE: In the case of replacing the (G) oil return pipe assy only, the procedures (11) and (12) are not required. (13) Connect the oil return pipe assy for replacement. After connecting the pipe, perform the nitrogen pressurization from (E) low pressure access port. During the work, check that the oil does not spill out from brazing part.
Page 180: Removing Expansion Valve And Solenoid Valve Coils
MAINTENANCE TURN OFF all POWER supply switches. 4.1.12 Removing Expansion Valve and Solenoid Valve Coils The following figures indicate the position of expansion valve and solenoid valve coils. (H,Y)VWH(P,R)072, 096, 120B(3,4)2S RVR1 RVR2 SVA: Solenoid Valve Coil SVB: Solenoid Valve Coil SVC: Solenoid Valve Coil SVG: Solenoid Valve Coil RVR1: Reversing Valve Coil RVR2: Reversing Valve Coil MV1: Expansion Valve Coil MV3: Expansion Valve Coil MV4: Expansion Valve Coil...
Page 181: Removing Expansion Valve Coil (Mv1,Mv3,Mv4, Mvb)
MAINTENANCE TURN OFF all POWER supply switches. 4.1.12.1 Removing Expansion Valve Coil (MV1,MV3,MV4, MVB) (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Turn the expansion valve coil in a counterclockwise direction as shown in the figure below.
Page 182 MAINTENANCE TURN OFF all POWER supply switches. (4) For replacing the expansion valve coils, press the coil into the expansion valve slot by turning the coil. If an excessive force is applied to the coil, the coil bracket may be deformed. As a result, the coil cannot be attached at the correct position shown in the figure. • Any slots on the expansion valve inner surface are acceptable to secure. NOTE: Do not apply an excessive force to the coil when pressing it into the slot. Otherwise, it may cause damage to the piping. Tool Pliers Expansion Valve Coil Press force is Press force is not enough. excessive. Correct Position for Coil Bracket Correctly grooved Expansion Valve Body in the slot.
Page 183: Removing Solenoid Valve Coil (Sva, Svb, Svc, Svg)
MAINTENANCE TURN OFF all POWER supply switches. 4.1.12.2 Removing Solenoid Valve Coil (SVA, SVB, SVC, SVG) (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”. (4) Remove the side cover R according to Section 4.1.6 “Removing Side Cover”.
Page 184 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Charging Hose, Tool Torch, Wet Cloth, Pliers Removing SVA (H,Y)VWH(P,R)072, 096, 120B(3,4)2S (H,Y)VWH(P,R)144, 168, 192, 216B(3,4)2S Brazing Part Brazing Part Removing SVB (H,Y)VWH(P,R)072, 096, 120B(3,4)2S (H,Y)VWH(P,R)144, 168, 192, 216B(3,4)2S Brazing Part Brazing Part Removing SVC (H,Y)VWH(P,R)072, 096, 120B(3,4)2S (H,Y)VWH(P,R)144, 168, 192, 216B(3,4)2S Brazing Part...
Page 185: Removing Reversing Valve Coil (Rvr1, Rvr2)
MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Charging Hose, Tool Torch, Wet Cloth, Pliers Removing SVG (H,Y)VWH(P,R)072, 096, 120B(3,4)2S (H,Y)VWH(P,R)144, 168, 192, 216B(3,4)2S Brazing Part Brazing Part Brazing Part Brazing Part 4.1.12.4 Removing Reversing Valve Coil (RVR1, RVR2) (1) Remove one screw securing the reversing valve coil with a phillips screwdriver. If the screw is difficult to remove, use an adjustable wrench or a ratchet. (2) Remove the reversing valve coils.
Page 186: Removing Reversing Valve Body (Rvr1, Rvr2)
MAINTENANCE TURN OFF all POWER supply switches. 4.1.12.5 Removing Reversing Valve Body (RVR1, RVR2) (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”. (4) Remove the side cover R according to Section 4.1.6 “Removing Side Cover”.
Page 187 MAINTENANCE TURN OFF all POWER supply switches. Adjustable Wrench or Ratchet, Tool Phillips Screwdriver, Torch, Pipe Cutter, Pliers, Charging Hose (H,Y)VWH(P,R)072, 096, 120B(3,4)2S Brazing Part RVR2 RVR1 Reversing Valve Reversing Valve Brazing Part Brazing Part (H,Y)VWH(P,R)144, 168, 192, 216BB(3,4)2S RVR1 Reversing Valve Brazing Part RVR2 Reversing Valve Brazing Part Brazing Part 4-37...
Page 188: Removing Stop Valve
MAINTENANCE TURN OFF all POWER supply switches. 4.1.13 Removing Stop Valve (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”.
Page 189: Removing High Pressure Switch, High Pressure Sensor, Low Pressure Sensor And Thermistors
MAINTENANCE TURN OFF all POWER supply switches. 4.1.14 Removing High Pressure Switch, High Pressure Sensor, Low Pressure Sensor and Thermistors (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”.
Page 190 MAINTENANCE TURN OFF all POWER supply switches. Tool Adjustable Wrench or Ratchet (H,Y)VWH(P,R)144, 168, 192, 216B(3,4)2S Tchg 208/230V PSH1 460V PSH2 4-40 SM-18006...
Page 191: Removing High Pressure Switch (Psh1 And Psh2)
MAINTENANCE TURN OFF all POWER supply switches. 4.1.14.1 Removing High Pressure Switch (PSH1 and PSH2) (1) Collect the refrigerant. (2) Disconnect wiring for the high pressure switch from high pressure switch. (3) Remove the high pressure switch from the brazing part of the discharge pipe with a torch. NOTES: ●...
Page 192: Removing Thermistor For Refrigerant Piping (Te, Tg, Tchg, Tsc)
MAINTENANCE TURN OFF all POWER supply switches. 4.1.14.3 Removing Thermistor for Refrigerant Piping (Te, Tg, Tchg, Tsc) (1) Disconnect the connector for the thermistor wiring from control PCB. (2) Remove the butyl sheet. Then, remove the thermistor for the refrigerant piping by pulling out the thermo clip from the piping.
Page 193: Removing Thermistor For Entering Water Temperature (Ta)
MAINTENANCE TURN OFF all POWER supply switches. 4.1.14.4 Removing Thermistor for Entering Water Temperature (Ta) In the case of removing the thermistor for entering water temperature only, the procedures (2) to (5) in Section 4.1.14 are not required. (1) Disconnect the connector for the thermistor wiring from control PCB. (2) Remove two screws that attach the thermistor cover.
Page 194: Removing Thermistor For Upper Side Of Compressor (Discharge Gas) Temperature (Td1 And Td2)
MAINTENANCE TURN OFF all POWER supply switches. 4.1.14.5 Removing Thermistor for Upper Side of Compressor (Discharge Gas) Temperature (Td1 and Td2) (1) Disconnect the connector for the thermistor wiring from control PCB. (2) Release the tack for the soundproof cover of the compressor and remove the soundproof cover. (3) Remove the thermistor for upper side of compressor temperature from top of the compressor.
Page 195: Removing Thermistor For Electrical Box Temperature (Ts)
MAINTENANCE TURN OFF all POWER supply switches. 4.1.14.6 Removing Thermistor for Electrical Box Temperature (Ts) In the case of removing the thermistor for electrical box temperature only, the procedures (2) to (5) in Section 4.1.14 are not required. This thermistor is located at inner upper side of electrical box. (1) Disconnect the connector for the thermistor wiring from control PCB.
Page 196: Removing Other Electrical Components
MAINTENANCE TURN OFF all POWER supply switches. 4.1.15 Removing Other Electrical Components NOTES: ● When replacing the components of the radiation plate such as inverter PCB, apply conductive silicon grease (Service Parts No.: P22760) slightly over the contact surface of the plate. ●...
Page 197 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers (H,Y)VWH(P,R)072, 096, 120B32S Control PCB Board Holder Middle Part of Board Holder Pinch here with long nose pliers to remove the PCB. Control PCB Board Holder Electrical Box 2.
Page 198 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers : Securing Screw for Wiring (M5) : Securing Screw for Wiring (M6) : Securing Screw for Wiring (M8) : Securing Screw for Wiring (M4) 1. Noise Filter (NF) Securing Screw for Wiring (six places) 2.
Page 199 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers : Board Holder : Securing Screw for Part 1. Noise Filter (NF) Board Holder (six places) 2. Inverter PCB (INV) Securing Screw for Part (M3) (two places) Securing Screw for Part (M5) (two places) 3.
Page 200 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers (H,Y)VWH(P,R)144, 168, 192, 216B32S Control PCB Board Holder Middle Part of Board Holder Pinch here with long nose pliers to remove the PCB. Control PCB Board Holder Electrical Box Control PCB 5.
Page 201 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers : Securing Screw for Wiring (M5) : Securing Screw for Wiring (M6) : Securing Screw for Wiring (M8) : Securing Screw for Wiring (M4) 1. Noise Filter (NF1, NF2) Securing Screw for Wiring (12 places) 2.
Page 202 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers : Board Holder : Securing Screw for Part 1. Noise Filter (NF1, NF2) Board Holder (12 places) 2. Inverter PCB (INV1, INV2) Securing Screw for Part (M3) (four places) Securing Screw for Part (M5) (four places) 3.
Page 203 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers (H,Y)VWH(P,R)072, 096, 120B42S Control PCB Board Holder Middle Part of Board Holder Pinch here with long nose pliers to remove the PCB. Control PCB Board Holder Electrical Box 2.
Page 204 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers : Securing Screw for Wiring (M5) : Securing Screw for Wiring (M6) : Securing Screw for Wiring (M8) : Securing Screw for Wiring (M4) 1. Noise Filter (NF) Securing Screw for Wiring (six places) 2.
Page 205 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers : Board Holder : Securing Screw for Part 1. Noise Filter (NF) Board Holder (six places) 2. Inverter PCB (INV) Securing Screw for Part (M3) (two places) Securing Screw for Part (M4) (six places) 3.
Page 206 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers (H,Y)VWH(P,R)144, 168, 192, 216B42S Control PCB Board Holder Middle Part of Board Holder Pinch here with long nose pliers to remove the PCB. Control PCB Board Holder Electrical Box Control PCB 1.
Page 207 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers : Securing Screw for Wiring (M5) : Securing Screw for Wiring (M6) : Securing Screw for Wiring (M8) : Securing Screw for Wiring (M4) 1. Noise Filter (NF1, NF2) Securing Screw for Wiring (12 places) 2.
Page 208 MAINTENANCE TURN OFF all POWER supply switches. Phillips Screwdriver, Tool Long Nose Pliers, Pliers : Board Holder : Securing Screw for Part 1. Noise Filter (NF1, NF2) Board Holder (12 places) 2. Inverter PCB (INV1, INV2) Securing Screw for Part (M3) (four places) Securing Screw for Part (M4) (12 places) 3.
Page 209: Removing Inverter Pcb
MAINTENANCE Turn OFF all POWER supply switches. Do not touch any electrical components while LED (Red) on Inverter PCB is ON. Current may be flowing through the components and cause electric shock. 4.1.15.2 Removing Inverter PCB (1) Disconnect all wiring with following connectors from the Inverter PCB. For 208/230V Type: CN206, CN207 and CN303 For 460V Type: PCN2, CN206, CN207 and PCN331...
Page 210: Removing Electrical Box
MAINTENANCE TURN OFF all POWER supply switches. 4.1.15.3 Removing Electrical Box Remove the electrical box according to Section 4.1.8 “Removing Electrical Box”. ● Proper handling of removal work must be performed by at least two people to avoid serious injuries. ●...
Page 211 MAINTENANCE TURN OFF all POWER supply switches. 460V (H,Y)VWH(P,R)072 - 120B42S Solenoid Valves and Reversing Valves Wiring Thermistor Wiring (SVA, SVB, SVC, RVR1, RVR2) (Td1) High Pressure Switch Wiring Solenoid Valve Wiring (PSH1) (SVG) Pressure Sensors Wiring (Pd, Ps) Compressor Power Wiring Expansion Valves Wiring (MVB, MV1, MV3, MV4) Crankcase Heater Wiring...
Page 212: Removing Cooling Fan
MAINTENANCE TURN OFF all POWER supply switches. 4.1.15.4 Removing Cooling Fan (1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and Front Cover”. (2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”. (3) Remove the pipe cover according to Section 4.1.5 “Removing Pipe Cover”.
Page 213 MAINTENANCE TURN OFF all POWER supply switches. Reassembling Electrical Box Reassemble the electrical box in the reverse procedure. NOTICE: ● Check to ensure that the tube end of waterproof vinyl pipe and the connectors are in the electrical box. Secure them firmly with a cable clamp during wiring as shown in the figure below. ●...
Page 214: Removing Components For Change-Over Box
MAINTENANCE TURN OFF all power source switches. 4.1.16 Removing Components for Change-Over Box 4.1.16.1 Removing Service Cover for Electrical Box and Electronic Expansion Valve (1) Remove the screws securing the electrical box cover and the electronic expansion valve cover. COBS048, 096B22S Service Cover for Electrical Box: 2 screws Service Cover for Electronic Expansion Valve: 2 screws...
Page 215 MAINTENANCE COB04M132B22S Service Cover for Electronic Expansion Valve Electrical Box Cover COB08M264B22S Service Cover for Electronic Expansion Valve Electrical Box Cover COB12M264B22S Service Cover for Electronic Expansion Valve Electrical Box Cover 4-65 SM-18006...
Page 216: Removing Electrical Components
MAINTENANCE TURN OFF all power source switches. 4.1.16.2 Removing Electrical Components Removing Change-Over Box PCB (1) Remove all the connectors for wiring connected to the Change-Over Box PCB. (2) Remove the communication wirings connected to the Change-Over Box PCB. Do not touch the electrical components on the Change-Over Box PCBs during the work.
Page 217 MAINTENANCE COB04M132B22S Pinch here with long nose pliers to remove the change-over box PCB. Change-Over Box PCB Board Holders Board Holder Electrical Box Electrical Box Cross Section P-P PCN1 PCN2 EFR1 EFS1 LED10 LED11 LED12 LED13 LED14 LED4 LED5 LED6 LED7 LED15 DSW1 DSW2...
Page 218 MAINTENANCE COB12M264B22S Pinch here with long nose pliers to remove the change-over box PCB. Change-Over Box PCB Board Holder Electrical Box Cross Section P-P Securing Screw (M4) for Board Holders Board Holders Board Holders Terminal Block (TB1) PCN1 PCN2 PCN1 PCN2 PCN1 PCN2...
Page 219: Removing Electric Expansion Valve Coil
MAINTENANCE TURN OFF all power source switches. 4.1.16.3 Removing Electric Expansion Valve Coil (1) Remove the front service cover according to Section 2.18.1 “Removing Service Cover for Electrical Box and Electronic Expansion Valve”. (2) Removing Electronic Expansion Valve (MVD1~4, MVS1~4) (a) Turn the electronic expansion valve coil.
Page 220 MAINTENANCE COB04M132B22S Cable Bands Wire Clips MVD1 MVD2 MVD3 MVD4 MVS2 MVS3 MVS4 MVS1 Electrical Box COB08M264B22S Cable Bands Wire Clip Wire Clips MVD1 MVD1 MVD2 MVD3 MVD4 MVD2 MVD3 MVD4 Cable Band MVS1 MVS2 MVS3 MVS4 MVS2 MVS3 MVS4 MVS1 Electrical Box Wire Clip...
Page 221: Inverter For 208/230V Type
MAINTENANCE (Main Parts) 4.2 Main Parts 4.2.1 Inverter for 208/230V Type Specifications of Inverter (208/230V Type) Applicable Model (H,Y)VWH(P,R)072, 096, 144, 168, 192, 216B32S (H,Y)VWH(P,R)120B32S Applicable Power Supply 208/230V 3PH 60Hz Output Voltage (Maximum) 208/230V Output Current (Maximum) Inverter PCB Control Method Vector PWM Control Range Output Frequency...
Page 222 MAINTENANCE (Main Parts) ● Arrangement of Inverter Power Unit Inverter PCB (INV1) Inverter PCB (INV2) Radiation Plate 2 Radiation Plate 1 Main Power PCB (MPB1) Main Power PCB (MPB2) (H,Y)VWH(P,R)144B32S, (H,Y)VWH(P,R)168B32S, (H,Y)VWH(P,R)192B32S and (H,Y)VWH(P,R)216B32S Only 4-72 SM-18006...
Page 223 MAINTENANCE (Main Parts) Testing Inverter Parts (208/230V Type) ● High Voltage Discharge Work for Replacing Parts Perform this high voltage discharge work to avoid an electric shock. Take special care to avoid a short circuit between terminal P and N. <...
Page 224 MAINTENANCE (Main Parts) If procedures (a) to (d) are performed and the results are satisfactory, the CIB on the inverter PCB (INV) is normal. NOTICE Recommended using an analog tester. (a) By touching the + side of the tester to the P terminal of the inverter PCB and the - side of tester to R, S, and T of the inverter PCB, measure the resistance.
Page 225 MAINTENANCE (Main Parts) (2) Internal Circuit of CIB Outlet Part 4-75 SM-18006...
Page 226 MAINTENANCE (Main Parts) If procedures (a) to (d) are performed and the results are satisfactory, the CIB on the inverter PCB is normal. NOTICE Recommended using an analog tester. (a) By touching the + side of the tester to the P1 terminal of the inverter PCB and the - side of tester to U, V, and W of the inverter PCB, measure the resistance.
Page 227 MAINTENANCE (Main Parts) (3) Testing the Fuse for Inverter Power By touching the + and - side of the tester on each side of the fuse (F601), measure the resistance. If the resistance is 0Ω, it is normal. NOTICE: Set analog, or digital tester at 1kΩ. F601 ●...
Page 228: Inverter For 460V Type
MAINTENANCE (Main Parts) 4.2.2 Inverter for 460V Type Specifications of Inverter (460V Type) Applicable Model (H,Y)VWH(P,R)072 ~ 216B42S Applicable Power Supply 460V 3PH 60Hz Output Voltage (Maximum) 460V Output Current (Maximum) Inverter PCB Control Method Vector PWM Control Range Output Frequency Inverter PCB 9Hz to 105Hz Accuracy of Frequency...
Page 229 MAINTENANCE (Main Parts) ● Arrangement of Inverter Power Unit Inverter PCB (INV1) Inverter PCB (INV2) Radiation Plate 2 Radiation Plate 1 (H,Y)VWH(P,R)144B42S, (H,Y)VWH(P,R)168B42S, (H,Y)VWH(P,R)192B42S and (H,Y)VWH(P,R)216B42S Only 4-79 SM-18006...
Page 230 MAINTENANCE (Main Parts) Testing Inverter Parts (460V Type) ● High Voltage Discharge Work for Replacing Parts Perform this high voltage discharge work to avoid an electric shock. Take special care to avoid a short circuit between terminal N1 and DCL2. <...
Page 231 MAINTENANCE (Main Parts) If procedures (a) to (d) are performed and the results are satisfactory, the CIB on the inverter PCB is normal. NOTICE Recommended using an analog tester. (a) By touching the + side of the tester to the P1 terminal of the inverter PCB and the - side of tester to R, S, and T of the inverter PCB, measure the resistance.
Page 232 MAINTENANCE (Main Parts) (2) Internal Circuit of CIB Outlet Part DCL2 DCL2 V0 W0 4-82 SM-18006...
Page 233 MAINTENANCE (Main Parts) If procedures (a) to (d) are performed and the results are satisfactory, the CIB on the inverter PCB is normal. NOTICE Recommended using an analog tester. (a) By touching the + side of the tester to the DCL2 terminal of the inverter PCB and the - side of tester to U0, V0, and W0 of the inverter PCB, DCL2...
Page 234 MAINTENANCE (Main Parts) (3) Testing the Fuse for Inverter Power By touching the + and - side of the tester on each side of the fuse (F651, F652), measure the resistance. If the resistance is 0Ω, it is normal. NOTICE: Set analog, or digital tester at 1kΩ.
Page 235: Printed Circuit Board
MAINTENANCE (Main Parts) 4.2.3 Printed Circuit Board ● Checking Procedures for Water Source Unit PCB Turn ON the water source W.S. PCB: Water Source Unit PCB unit power supply. There are possibilities of the following Press and hold the PSW1 failures: of W.S.
Page 236: Scroll Compressor
MAINTENANCE (Main Parts) 4.2.4 Scroll Compressor ● Reliable Mechanism for Low Vibration and Low Sound (1) The rotating direction is definite. (2) The pressure inside of the compressor housing is high pressure, and the surface temperature of the compressor housing is 140 F (60 C) to 230 F (110...
Page 237 MAINTENANCE (Main Parts) Structure ● The compressor has the structure for oil supply from the outer oil separator. The inside of the oil separator is at high pressure, and the surface temperature of the oil separator is as high (140 F (60 C) to 230 F (110...
Page 238 MAINTENANCE (Main Parts) ● Protective Function (1) Excessive High or Low Voltage for Inverter (a) Level of Detection In case of 208/230V, 60Hz. When the voltage of direct current is greater than 424V, abnormalities are detected. When the voltage of direct current is smaller than 196V, abnormalities are detected. In case of 460V/60Hz When the voltage of direct current is greater than 844V, abnormalities are detected.
Page 239 MAINTENANCE (Main Parts) (5) Fin Temperature Increase (a) Level of Detection In case of 208/230V type When the temperature of internal thermistor exceeds 222 F (106 C) or 232 F (111 C), an abnormality is detected. In case of 460V type When the temperature of internal thermistor exceeds 230 F (110 C), an abnormality is detected.
Page 240 MAINTENANCE (Main Parts) ● Checking of Compressor CHECK LIST ON COMPRESSOR CLIENT: MODEL: DATE: Serial No.: Production Date: Checker: Check Item Check Method Result Remarks Are THM8 and THM9 correctly (1) Are wires of each thermistor correctly connected? connected by viewing? (2) Check to ensure that 7-segment indication of THM8 and THM9: Td1 is higher than Td2 when No.1 comp.
Page 241 MAINTENANCE (Main Parts) Additional Information for “CHECK LIST ON COMPRESSOR” Check Additional Information (Mechanism of Compressor Failure) Item 1, 2 The liquid refrigerant return volume to the compressor is controlled by the discharge gas temperature Td1 when only No.1 compressor is operating. If Td1 and Td2 are reversely connected, the liquid refrigerant return volume will become smaller by detecting the temperatures even if the actual discharge gas temperature is high.
Page 242: Cooling Fan
MAINTENANCE (Main Parts) 4.2.5 Cooling Fan inch (mm) Rotation Airflow #24 AWG Terminal Type 5/16 (7.5) (Thick 0.02 (0.5)) 3/16 8 - φ3/16 (4.3) 4-1/8 (104.8) 4-11/16 (119) 1-1/2 (38.5) ● Specifications for Cooling Fan CF (PCN28) Model DP202A Working Temperature Range F to 158 F (-10 C to 70...
Page 243: Thermistor
MAINTENANCE (Main Parts) 4.2.6 Thermistor (1) Position of Thermistor Tg Thermistor for Heat Exchanger Gas Side Temperature Ts Thermistor for Electrical Box Temperature (Inner Upper Side of Electrical Box) Tsc Thermistor for Subcooler Inlet Temperature Td Thermistor for Upper Side of Compressor Temperature Ta Thermistor for Entering Water Temperature...
Page 244 MAINTENANCE (Main Parts) (2) Thermistor for Upper Side of Compressor (Discharge Gas) Temperature “Td1, Td2” (THM8, 9) a. A thermistor for the upper part temperature of the compressor is installed to prevent discharge gas from overheating. If discharge gas temperature increases excessively, lubricating oil deterioration occurs.
Page 245 MAINTENANCE (Main Parts) (3) Thermistor for Entering Water Temperature “Ta” (THM7) The thermistor resistance characteristics are shown in the figure below. (4) Thermistor for Evaporation Liquid Line “Te1, Te2” (THM10, 11) and Evaporation Gas Line “Tg” (THM12) Temperature of Water Source Unit The characteristics for the thermistor are the same as those of the entering water temperature thermistor shown in the figure below.
Page 246: Electronic Expansion Valve
MAINTENANCE (Main Parts) 4.2.7 Electronic Expansion Valve Micro-Computer Pulse Motor Pulse Signal 2-2 Phase Permanent Magnetic Pulse Motor Opening of expansion valve is controlled by the water source unit PCB1 order. Refrigerant Flow Control Precise Control Needle ● Specifications for MV1 and MV4 Model PAM-BBOYGHS-1 Working Temperature...
Page 247 MAINTENANCE (Main Parts) ● Specifications for MV3 Model UKV-U029E or UKV-A027 Working Temperature F to 158 F (-30 C to 70 Range Refrigerant Used R410A Insulation Resistance Min. 100MΩ (at 500VDC Megger) Withstand Voltage 1800VAC for 1 Second Rated Voltage DC12V+1.2V 83+5 PPS Drive Condition...
Page 248 MAINTENANCE (Main Parts) ● Specifications for MVB Model UKV-U040E or UKV-A035 Working Temperature F to 158 F (-30 C to 70 Range Refrigerant Used R410A Insulation Resistance Min. 100MΩ (at 500VDC Megger) Withstand Voltage 1800VAC for 1 Second Rated Voltage DC12V+1.2V 83+5 PPS Drive Condition...
Page 249: Pressure Sensor
MAINTENANCE (Main Parts) 4.2.8 Pressure Sensor (1) High Pressure Control The high pressure during heating operation is detected by a high pressure sensor, and compressor frequencies are controlled by the proportional controlling method with operating capacity of indoor units (or PID Control for Compressor Frequency) so that the high pressure is controlled in an appropriate range.
Page 250: High Pressure Protection Device
MAINTENANCE (Main Parts) 4.2.9 High Pressure Protection Device If the discharge pressure is excessively high, the compressor and the component parts of the refrigeration cycle can be damaged. Therefore, if the discharge pressure is higher than 601psi (4.15MPa) (R410A), the protection control is activated, and the compressor is stopped. High Pressure Switch 4-100 SM-18006...
Page 251: Electrical Coil Parts
MAINTENANCE (Main Parts) 4.2.10 Electrical Coil Parts ● Solenoid Valve Solenoid Applicable Model Electrical Coil Model Resistance Valve Coil FQ-A0522G-000624 SVA, SVB 2150Ω at 68 F (20 Body FDF4A13 (H,Y)VWH(P,R)072 to 216B32S (H,Y)VWH(P,R)072 to 216B42S Coil FQ-A0522G-000624 SVC, SVG 2150Ω at 68 F (20 Body FDF2A65...
Page 252: Noise Filter (Nf1, Nf2)
MAINTENANCE (Main Parts) 4.2.11 Noise Filter (NF1, NF2) The noise filter decreases the leakage of noise made by the inverter to the power supply side. Terminals indicated with “R2”, “S2” and “T2” are connected to the inverter side. Terminals indicated with “R1”, “S1” and “T1”...
Page 253 MAINTENANCE (Main Parts) (2) Noise Filter for 460V Type Items Specifications Model NF161Q Rated Voltage AC 460V Rated Current Circuit Diagram inch (mm) 6-φ3/16 (4) NFT-040A25-HHA0 H7B04937A-D DC 500V 63A DC 500V 63A 4-1/4 (108.5) 4-3/8 (111.5) 9-3/16 (233) 7-7/8 (200) 4-103 SM-18006...
Page 254: Reactor (Dcl1, Dcl2)
MAINTENANCE (Main Parts) 4.2.12 Reactor (DCL1, DCL2) This part is used for smoothing the direct current to the inverter circuit. (1) Reactor for 208/230V Type Items Specifications Character 0.7mH+15%, -10% (1KHz) Rated Current Direct Current Resistance 20mΩ (68 F (20 inch (mm) 4-1/8 (104) 3-5/8 (92.0)
Page 255 MAINTENANCE (Main Parts) (2) Reactor for 460V Type Items Specifications Character 1.0mH+15%, -10% (1KHz) Rated Current Direct Current Resistance 28mΩ (68 F (20 inch (mm) 2-9/16 (65) 2-1/16 (53) 2-9/16 (65) 1-7/8 (47.5) 29-1/2 (750) 3-1/8 (80) 1-5/16 (34) 13/16 (21) 4-105 SM-18006...
Page 256: Transformer (Tf) For 460V Type
MAINTENANCE (Main Parts) 4.2.13 Transformer (TF) for 460V Type This part is used for supplying power voltage to the control and inverter PCB. Items Specifications Primary AC 460V 60Hz Rated Voltage Secondary 230V Rated Power 322VA Primary Secondary AC 460V 60Hz 230V 1.4A Circuit Diagram Temperature...
Page 257: Change-Over Box
MAINTENANCE (Main Parts) 4.2.14 Change-Over Box Printed Circuit Board PCB 1 - 3 COBS048, 096B22S/C CN12 VDC13 VDC15-1 PCN1 CN11 GND1 VCC15 VDC- COB04M132, 08M264, 12M264B22S EF161 EF141 Vcc15-1 EF121 VDC- EF101 EF301 GND1 CN10 Vcc5 PCN2 PCN1 Vcc13 CN11 4-107 SM-18006...
Page 259: External Input/Output And Function Setting
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5. External Input/Output and Function Setting SM-18006...
Page 260: Dip Switch Settings Of Water Source Unit
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5.1 DIP Switch Settings of Water Source Unit TURN OFF all power supply before setting. Without turning OFF the power supply, the switches will not work and the settings will be invalid. (However, DSW4, 5, 8 and push switches can be operated when the power supply is ON.) The “n”...
Page 261: External Input/Output And Function Setting Mode For Water Source Unit
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (2) Water Flow Switch Detection during Water Source Unit Stoppage (DSW5-No.5) If water flow switch is ON (close) while the water source unit is stopped (during “Valve/Pump Operation Request” output signal is OFF), there is a function the unit judge the detection of water flow even though there is no water flow and the contact of water flow switch is failed (“A2” alarm triggered). (In case the contact of water flow switch stays ON (close) while it is broken and the water flow rate is insufficient the water flow switch does not turn OFF (open) and insufficient water flow rate cannot be detected (“A2” alarm). This may cause the compressor and plate heat exchanger to malfunction.) In case this function is used, water flow during the water source unit stoppage is prohibited and water circulation for freeze protection and water temperature adjustment is not available. DSW5-No.5 Water Flow Switch Detection during Water Source Unit Stoppage Not Available (Default) Available 5.2 External Input/Output and Function Setting Mode for Water Source Unit...
Page 262: External Input And Output Settings
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5.2.1 External Input and Output Settings On the water source unit Printed Circuit Board (PCB), there are three input terminals (CN17, CN18 as shown below) to receive external signals and two output terminals (CN16) to send signals out. Control functions shown in these tables are available when setting input and output terminals. < Input > <...
Page 263 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING ● Settings for External Input and Output If an alternative setting is required at a site, perform the following procedures. (1) By selecting “External Input and Output Setting”, the following appears on the 7-segment display. (The setting should be performed during an water source unit stoppage. Also, set DSW4-No.4 of the water source unit PCB to the “ON” side before performing the setting in order to prevent the compressor activation.) SEG2 SEG1...
Page 264 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING ● External Input Function Setting The following signals can be received by the water source unit PCB. Refer to Table 5.1 below for the required main parts. (1) Input Fixing Heating Operation Mode (Control Function No.1), Input Fixing Cooling Operation Mode (Control Function No.2) When the input terminals for the setting operation mode on the water source unit PCB are short-circuited, the operation mode can be set at the cooling or heating mode.
Page 265 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (2) Input Demand Stoppage (Control Function No.3), Input Forced Stoppage (Control Function No.5) When the input terminals for Demand Stoppage or Forced Stoppage on the water source unit PCB are short-circuited while running, the compressor(s) is stopped. The fan motor of indoor unit(s) is operated as shown below.
Page 266 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (3) Input Flow Switch Signal (Control Function No.4) When the input terminals for the setting operation mode on the water source unit PCB are short-circuited, flow switch signal is detected. Short Circuit between Terminals 1 and 2 of CN17: Flow Switch Signal Water source unit is damaged if it is operated with no water circulating through the water piping.
Page 267 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (4) Input Demand Current Control 40, 60, 70, 80, 100% (Control Function No.6 to 10) When the input terminals for Demand Current Control on the water source unit PCB are short-circuited, the compressor frequency is controlled so that the maximum limit of the water source running current is set to 100%, 80%, 70%, 60% or 40% of the reference power consumption. If the water source unit running current exceeds the maximum limit for twenty minutes, the indoor unit is put under Thermo-OFF condition.
Page 268 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (5) Input Low Noise Setting 1, 2, 3 (Control Function No.11 to 13) When the input terminals for Low Noise Setting on the water source unit PCB are short-circuited, the compressor frequency is controlled and the operating sound of the water source unit will be as shown in the table below.
Page 269 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (6) Input External Abnormality Detection (Control Function No.14) When the input terminals for External Abnormality Detection on the water source unit PCB are short- circuited, the unit is forced to stop. In this case, the stoppage code No. “10” is given. When the input terminal is opened during the external abnormality detection, its control is released. • Setting Example External Abnormality Detection at Input 3 (between 1 and 2 pins of CN18), Control Function No.14 Water Source Unit X1: Auxiliary Relay SS3: Emergency Switch 3P Connector...
Page 270 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING ● External Output Function Setting The following signals can be picked up from the water source unit PCB. Refer to Table 5.2 for the required auxiliary relay. (1) Output Operation Signal (Control Function No.1) This function is utilized to receive the operation signal. Auxiliary relay contacting (RYa) is closed during the operation. The operation signal will be sent to output terminals when the indoor units are operating. (Even when one indoor unit is operating, the signal will be sent.) This function can be used for circulator or humidifier operation.
Page 271 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (3) Output Compressor ON Signal (Control Function No.3) This function is utilized to receive the compressor operation signal. Auxiliary relay contacting (RYa) is closed during the compressor operation. • Setting Example Compressor ON Signal at Output 2 (between 1 and 3 pins of CN16) Auxiliary Relay 3P Connector Housing 1 2 3 CN16 Connector...
Page 272: Function Setting
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5.2.2 Function Setting ● Refer to Section 5.2 “● Setting Method” for mode transition functions. NOTE: The setting should be performed during the water source unit stoppage. Water Source unit A is the unit to which the communication cable between the water source unit and indoor unit is connected. (1) By selecting “Function Setting”, the following appears on the 7-segment display. (The setting should be performed during an water source unit stoppage. Also, set DSW4-No.4 and No.5 of the water source unit PCB to the “ON” side before performing the setting in order to prevent the compressor activation.) SEG2 SEG1...
Page 273 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5.2.2.1 Function Setting Item 7-Segment Display Setting Item Contents SEG2 SEG1 No setting Indoor fan forced ON and OFF (2 min. ON / 6 min. OFF) Circulator Function Indoor fan forced ON and OFF (2 min. ON / 13 min. OFF) at Heating Thermo-OFF Indoor fan forced ON and OFF (2 min. ON / 28 min. OFF) Indoor fan stop Not Prepared Not Prepared Not Prepared Indoor fan stop when heating operation is activated/during defrost operation Indoor fan SLo operation during defrost operation Indoor fan SLo operation when heating operation is activated SLo (Fan Speed) Indoor fan SLo operation when heating operation is activated/during defrost...
Page 274 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 7-Segment Display Setting Item Contents SEG2 SEG1 Not Prepared Not Prepared Not Prepared Not Prepared Not Prepared Not Available Stoppage for 20 days Stoppage for 15 days Crankcase Heater Control during Stoppage for 10 days Stoppage Stoppage for 5 days Stoppage for 3 days Stoppage for 2 days...
Page 275: Description Of Function Setting Item
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5.2.2.2 Description of Function Setting Item (1) Circulator Function at Heating Thermo-OFF (Function Setting “FA”) Press “PSW3” and select the setting conditions “0 to 4” in Circulator Function at Heating Thermo-OFF “ ”. Normally, the fan speed is changed to “LOW” at heating Thermo-OFF. (It is possible for the room temperature to be too high at the heating Thermo-OFF.) However, the indoor fan motor is operated at “LOW”...
Page 276 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (2) Capacity-Focused Mode Setting (Function Setting “nU”) If the unit capacity seems insufficient during the normal operation, press “PSW3” and select the setting condition “0” to “3” Capacity-Focused Mode Setting “ ”. By setting this function, the target frequency and current limit of the compressor is set higher. NOTE: Do not use setting conditions “2” and “3” unless the power supply wiring is sufficient ampacity, because the target frequency and current limit of the compressor during the operation are set higher.
Page 277 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (4) Demand Function Setting (Function Setting “dE”) Press “PSW3” and select the setting condition “0” to “5”, so that Demand Function Setting “ ” can be set. This function is available by setting to “1” for the demand current control without inputting the signal to the external input terminal on the water source unit PCB. The table below shows the limit of the operating current for this function.
Page 278 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (5) Wave Function Setting (Function Setting “UE”) Press “PSW3” and select the setting condition “0” to “4”, so that Wave Function Setting “ ” can be set. While this function is activated, the maximum limit of running current is changed from 40% to 80% as shown in the figure. NOTE: If Demand Current Control by External Input Function is set and the external input signal is available, this function is not performed during Demand Current Control by External Input Function is performed. "UE" Setting Condition Running Current Lower Limit Setting Not Available (Default Seting) Electricity...
Page 279 EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING (7) Temperature and Pressure Unit Setting (Function Setting “Fd”) Press “PSW3” and set Temperature and Pressure Unit “ ” to change the unit setting of temperature and pressure. "Fd" Setting Condition Unit Temperature: F, Pressure: psi (Default Setting) Temperature: C, Pressure: MPa 5-21...
Page 280: Power Saving Functions From Wired Controller
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5.3 Power Saving Functions from Wired Controller The power saving functions are available from the wired controller COW01 as follows. 5.3.1 Power Saving Guide Press “ECO” button then the power saving guide will be displayed to support the setting. Easy access to the confirmation and setting screen from the current setting status screen.
Page 281: Rotation Control Function
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5.3.3 Rotation Control Function The rotation control switches multiple indoor unit operating mode to FAN mode (Thermo-OFF) in order one by one. Order of Fan Operation Cooling Operation Operation* Indoor Unit 1 Order of Fan Operation The indoor unit fan Cooling Cooling operation is Operation Operation* Operation performed in rotation by Indoor Unit 2 indoor unit address Nos.
Page 282: Power Saving Schedule Function
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING 5.3.5 Power Saving Schedule Function The power saving schedule function is utilized to set the power saving schedule on indoor unit capacity control and intermittent control up to five settings a day each day of the week. The display of Noise Reduction Schedule is the same. 5.3.6 Operation Noise Reduction Schedule Function The operation noise reduction schedule function is utilized to set the operation noise reduction schedule up to five settings a day each day of the week.
Page 283: Field Work Instructions
FIELD WORK INSTRUCTIONS 6. Field Work Instructions SM-18006...
Page 284: Maintenance Work For Water Circuit
FIELD WORK INSTRUCTIONS Refer to Section 3 “Troubleshooting” when dealing with problems or difficulties. If you cannot solve the problem, contact your distributor or contractor. Maintenance Work for Water Circuit If the water pressure difference at the water inlet and outlet sides of the plate heat exchanger changes compared to during Test Run, the water strainer may be clogged.
Page 285: Modifications Of Charging Refrigerants Other Than Those Specified By Johnson Controls
Modifications of Charging Refrigerants Other than Those Specified by Johnson Controls DANGER Johnson Controls’ air conditioners are designed and manufactured based on using specified refrigerants. The applicable refrigerants are specified for each unit’s models. Using any refrigerants besides the specified refrigerants may cause mechanical problems, malfunction, and failure, and in the worst case, it endangers safety seriously and may cause a fire or an explosion.
Page 286: Maintenance Work For Cycle Operation
FIELD WORK INSTRUCTIONS Maintenance Work for Cycle Operation (1) For Water Source Unit and Indoor Unit (a) Fan and Fan Motor • Lubrication - All fan motors are pre-lubricated and sealed at the factory. Therefore, no lubricating maintenance is required. •...
Page 287: Service And Maintenance Record By 7-Segment Display
FIELD WORK INSTRUCTIONS Service and Maintenance Record by 7-Segment Display Customer’s Name DATE: (1) Information of Connected Water Source/Indoor Unit Capacity (1) Test Run Start Time (2) Data Collect Start Time Total Capacity of Water Source Unit Connected Connected Water Source Unit Number Total Capacity of Indoor Unit Connected Connected Indoor Unit Number Refrigerant Address...
Page 288 FIELD WORK INSTRUCTIONS (2) Information of Water Source Unit Water Source Unit A Water Source Unit B Water Source Unit C Water Source Unit Model (Serial No. (Serial No. (Serial No. (1) Operation Mode (2) Test Run Start Time (3) Data Collect Start Time Read Out Data from 7-Segment in Water Source Unit (5) Protection Control Code...
Page 289 FIELD WORK INSTRUCTIONS (3) Information of Indoor Unit Indoor Unit No. Indoor Unit Model (Serial No. ) (Serial No. ) (Serial No. (Serial No. (1) Test Run Start Time (2) Data Collect Start Time Indoor Unit Capacity Indoor Expansion Valve Opening Liquid Pipe Temperature of Indoor Unit Gas Pipe Temperature of Indoor Unit Indoor Unit Inlet Air Temperature...
Page 290 FIELD WORK INSTRUCTIONS (4) Information of Cause Code of Alarm (1) Test Run Start Time (2) Data Collect Start Time Alarm Cause Code Degeneracy Control for Pressure Ratio Decrease Protection Degeneracy Control for High Pressure Increase Protection Degeneracy Control for Inverter Temperature Increase Protection Degeneracy Control for Discharge Gas Temperature Increase Protection...
Page 291: Service And Maintenance Record By Wired Controller
FIELD WORK INSTRUCTIONS Service and Maintenance Record by Wired Controller Data Sheet for Checking by Wired Controller Time I.U. Model I.U. Serial No. I.U. No. / Alarm Code Check Check Mode Mode 1 • 2 1 • 2 1 • 2 1 •...
Page 292 FIELD WORK INSTRUCTIONS P Compressor Condition Indication (Reference) Comp. Current Accumulated Operation Time of Comp. Q Sensor Condition Indication Motion Sensor Response Rate Radiation Sensor Temp. Motion Sensor1 Response Rate Motion Sensor2 Response Rate Motion Sensor3 Response Rate Motion Sensor4 Response Rate Setting Temp.
Page 293: Service And Maintenance Record
FIELD WORK INSTRUCTIONS Service and Maintenance Record Service and Maintenance Record Check Item Action Judgment Is service space sufficient? YES or NO Short Circuit of Discharged Air? YES or NO Any Heat Influence? YES or NO Is ground wiring connected? YES or NO Water Piping GOOD or NOT GOOD...
Page 294: Saturation Curve For Refrigerant
FIELD WORK INSTRUCTIONS Saturation Curve for Refrigerant R410A ‐50 ‐25 Saturation Temperature (Liquid) [ 6-12 SM-18006...
Page 295: Mollier Chart For R410A
FIELD WORK INSTRUCTIONS Mollier Chart for R410A 6-13 SM-18006...
Page 297: Service Parts List
SERVICE PARTS LIST 7. Service Parts List SM-18006...
Page 298 SERVICE PARTS LIST Refer to the Service Parts List for Water Source Unit and Change-Over Box. SM-18006...

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Johnson Controls HVWHP072B32S Service Manual

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