Page 1 Order No. SBPAC1509017CE 3WAY VRF System U-72MF2U9 U-96MF2U9 U-120MF2U9 U-144MF2U9 Model No. Outdoor Unit Nominal Capacity Type Outdoor Unit Type MF2 3WAY VRF System U-72MF2U9 U-96MF2U9 U-120MF2U9 U-144MF2U9  To be connecting Indoor Units Indoor Units Nominal Capacity Type Indoor Unit Type 4-Way Cassette 36"x36"...
Page 2 IMPORTANT! When Transporting Please Read Before Starting Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees This air conditioning system meets strict safety and when lifting to reduce strain on your back. Sharp edges or operating standards.
Page 3: Check Of Density Limit
• Do not leak refrigerant while piping work for an installation or re-installation, and while repairing CAUTION refrigeration parts. Handle liquid refrigerant carefully as it may cause • Do not touch the air inlet or the sharp frostbite. aluminum fins of the outdoor unit. You When Servicing may get injured. • Ventilate any enclosed areas when installing or • Turn the power OFF at the main power box (mains) testing the refrigeration system. Leaked before opening the unit to check or repair electrical refrigerant gas, on contact with fire or heat, can parts and wiring. produce dangerously toxic gas. • Keep your fingers and clothing away from any moving • Confirm after installation that no refrigerant gas parts. is leaking. If the gas comes in contact with a • Clean up the site after you finish, remembering to burning stove, gas water heater, electric room check that no metal scraps or bits of wiring have been heater or other heat source, it can cause the left inside the unit. generation of toxic gas. Others WARNING • This product must not be modified or CAUTION disassembled under any circumstances.
Page 4: Precautions For Installation Using New Refrigerant
Precautions for Installation Using New Refrigerant 1. Care regarding tubing 1-1. Process tubing Material: Use clean, dry, free of oil, refrigeration grade, seamless, phosphorous deoxidized copper tube rated for R410A only. Wall thickness shall comply with the applicable legislation. The minimal wall thickness must be in accordance with the table below.
Page 5 3-2. Use R410A exclusive cylinder only. Valve Single-outlet valve with the cylinder standing on end as shown. New refrigerant R410A cannot be used for earlier models 1. Compressor specifications are different. some of the materials used for compressor parts are different.
Page 6: Table Of Contents
— CONTENTS — Section 1: CONTROL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Introduction .
Page 7 Section 4: REMOTE CONTROLLER FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Simple Settings Function .
Page 8 – MEMO –...
Page 9: Control Functions
2WAY VRF SYSTEM 3WAY VRF SYSTEM Contents Contents Control Functions Control Functions 1. CONTROL FUNCTIONS Introduction ........................Selecting Outdoor Unit for Operation ................Compressor Control ....................... Output of PCB ....................... 1-13 Outdoor Fan Control ..................... 1-19 Outdoor Unit CCU (command controller unit) Control ..........1-23 7.
Page 10: Introduction
2WAY VRF SYSTEM 3WAY VRF SYSTEM 1. Introduction Control Functions 1. Introduction Control Functions The MF2U series outdoor units for USA is a system that allows multiple outdoor units to be connected. All the outdoor units do not utilize the sub units that were used in earlier systems. The O/U.ADD of outdoor unit PCB where the unit is set to “1”...
Page 11: Selecting Outdoor Unit For Operation
2WAY VRF SYSTEM 3WAY VRF SYSTEM 2. Selecting Outdoor Unit for Operation Control Functions 2. Selecting Outdoor Unit for Operation Control Functions 2-1. Outdoor Unit Operating Rules As a result of setting the main outdoor and sub outdoor units due to the O/U.ADD setting, the order of priority for the outdoor units is determined in small values of O/U.ADD sequence.
Page 12 3WAY VRF SYSTEM 2. Selecting Outdoor Unit for Operation Control Functions 2-3. Outdoor Unit Stop Rules 2-3-1. Stopping of all outdoor units When all outdoor units must stop, the units stop at the same time. 2-3-2. Stopping of individual outdoor units according to load of air-conditioning ●...
Page 13: Compressor Control
2WAY VRF SYSTEM 3WAY VRF SYSTEM 3. Compressor Control Control Functions 3. Compressor Control Control Functions 3-1. Compressors Mounted in the Outdoor Units unit : kW Type of outdoor unit Inverter compressor 1st compressor (High pressure rotary) Inverter compressor 2nd compressor (High pressure rotary) * The inverter compressor is operated according to the load and does not operate beyond outdoor unit capacity.
Page 14 2WAY VRF SYSTEM 3WAY VRF SYSTEM 3. Compressor Control Control Functions 3. Compressor Control Control Functions 3-2-2. Operating compressors When heat exchanger of the outdoor unit is condenser (All cooling mode or mixed cooling/heating) The compressor with higher priority order starts according to the priority order described on the compressor selection rules.
Page 15 3WAY VRF SYSTEM 3. Compressor Control Control Functions 3-6. Capacity Control (Roadmap control) 1 The capacity control by the compressors is performed according to the pressure sensor attached to the outdoor unit and temperature thermistor attached to the indoor / outdoor unit heat exchanger. * With roadmap control, the pressure detected by the pressure sensor is converted to saturation temperature before it is used by microcomputer.
Page 16 3WAY VRF SYSTEM 3. Compressor Control Control Functions 3-6-2. Condensation temperature adjustment by roadmap control The area B target temperature is different due to cooling, heating and mixed cooling/heating operation. Target lower temperature Target upper temperature (Tc_tgt_min) (Tc_tgt_max) Cooling 127.4°F (53.0°C) 131.0°F (55.0°C) Heating 118.4°F (48.0°C)
Page 17 3WAY VRF SYSTEM 3. Compressor Control Control Functions 3-6-3. Cooling operation with low ambient temperature When operating in cooling mode with the ambient temperature less than 69.8°F (21°C), the unit is set in low ambient temperature cooling mode. During low ambient temperature cooling mode, the heat exchanger capacity control is performed in addition to the compressor capacity control.
Page 18 3WAY VRF SYSTEM 3. Compressor Control Control Functions Compressor Control Table Condensation Temp. [Tc] High not_UP slow_UP Target STOP DOWN not_UP Evaporation temperature (Te) and condensation temperature (Tc) areas A, B, C and D are the same as for evaporation temperature control and condensation temperature control. (2) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as a condenser) •...
Page 19 3WAY VRF SYSTEM 3. Compressor Control Control Functions (3) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as an evaporator) • Primarily when both the evaporation temperature (Te) and condensation temperature (Tc) are low This occurs when the cooling capacity (heat intake) is high and the heating capacity (heat discharge) is low. The outdoor heat exchanger capacity is increased, increasing the system evaporation capacity and raising the evaporation temperature (Te).
Page 20 2WAY VRF SYSTEM 3WAY VRF SYSTEM 3. Compressor Control Control Functions 3. Compressor Control Control Functions 3-7-3. Current protection This restriction protects the compressor and controls the compressor electric current simultaneously. The current limitation value changes to “normal status” and “overload status” according to the outdoor temperature.
Page 21: Output Of Pcb
3WAY VRF SYSTEM 4. Output of PCB Control Functions Item Indication on PCB Discharge valve 1 DCV1 Discharge valve 2 DCV2 Suction valve 1 SCV1 Suction valve 2 SCV2 Heat exchanger pressure balance valve 1 PBV1 Heat exchanger pressure balance valve 2 PBV2 Solenoid valve Save valve...
Page 22 3WAY VRF SYSTEM 4. Output of PCB Control Functions 4-2. Save Valve [SAVE] ● This valve turns ON for 5 seconds before the inverter compressor starts. After the inverter compressor starts, the valve turns ON for 10 seconds. Then it turns OFF. ●...
Page 23 3WAY VRF SYSTEM 4. Output of PCB Control Functions 4-4. Refrigerant Balance Valve [RBV] The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor unit when the outdoor unit heat exchanger is functioning as an evaporator. When the valve determines that there are signs of excess refrigerant, refrigerant is recovered at the receiver tank.
Page 24 3WAY VRF SYSTEM 4. Output of PCB Control Functions 4-6. By-Pass Valve [BPV] This valve is for pushing the oil in the balance piping into other outdoor unit. ● This valve turns ON when the oil level of compressor is “2” or “1” in its own outdoor unit and the oil level of compressor is “0”...
Page 25 3WAY VRF SYSTEM 4. Output of PCB Control Functions 4-9-3. Expansion valves for heat exchanger control The configuration of the heat exchangers is different depending on the capacity of the outdoor unit. Operation of electronic control valves during normal unit operation Status of MOV1 MOV2...
Page 26 3WAY VRF SYSTEM 4. Output of PCB Control Functions 4-10. SC Circuit Expansion Valve [MOV4] 4-10-1. SC control (Cooling mode only) During cooling operation, the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into the receiver tank, and SC (sub-cooling) approaches 32°F (0°C). When SC is small and the length of the tubing connecting the indoor and outdoor units is long, the refrigerant flow in the indoor unit will be reduced significantly.
Page 27: Outdoor Fan Control
3WAY VRF SYSTEM 5. Outdoor Fan Control Control Functions 5-1. Fan Mode These outdoor units utilize a DC fan motor that can be controlled in a maximum of 15 steps (15 modes). However, fan modes 14 and 15 can only be used if high static pressure mode has been set. * For information concerning EEPROM settings, refer to the field application functions.
Page 28 3WAY VRF SYSTEM 5. Outdoor Fan Control Control Functions 5-1-2. Snow removal control (1) Independent control of outdoor unit (control for fan crack prevention) This control is intended to prevent snow from accumulating on stopped fans. When the outdoor unit is stopped, the fan motor is forcibly started by the control for fan crack prevention’s fan mode.
Page 29 3WAY VRF SYSTEM 5. Outdoor Fan Control Control Functions 5-1-3. Silent mode This unit includes 2 types of silent modes. See the table under the section “5-1. Fan mode” for maximum fan mode in silent mode. Selecting the silent mode results in operation that gives priority to reducing noise, because these modes involve restrictions on outdoor unit fan modes, the capacity will be somewhat reduced.
Page 30 3WAY VRF SYSTEM 5. Outdoor Fan Control Control Functions 5-2. Fixed Initial Fan Mode For the first 30 seconds after operation starts, the mode is fixed at the initial mode which was calculated from the relationship between the ambient temperature and the outdoor unit horsepower. If the outdoor unit horsepower changes dramatically, the initial mode may be recalculated and may be again fixed for 30 seconds.
Page 31: Outdoor Unit Ccu (Command Controller Unit) Control
3WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions 6-1. MOV of Indoor Unit 6-1-1. MOV of each indoor unit operation mode Mode of Outdoor unit Thermostat indoor unit (system) ON/OFF Stop 20 pulses Stop Operating 20 pulses Stop 20 pulses...
Page 32 3WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions 6-2. Solenoid Valve Kit Control [SVK] This device connects the solenoid valve kit which is used to switch between indoor unit cooling/heating for 3WAY types. In case of special controls, solenoid valve kit performs special operation. For details, see the sections “7.
Page 33 3WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions 6-3-2. Dry mode Indoor unit fan run in the dry mode is controlled from CCU as shown in the below figure. Fan speed set by remote controller Fan speed is “L”...
Page 34 3WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions EEPROM setting in main outdoor unit CODE: 2B Setting No. 20 minutes 30 minutes (factory preset mode) 40 minutes 50 minutes 60 minutes * The drain pump always operates when the indoor unit is thermostat ON in cooling operation. * Once the drain pump operates, it keeps operating for 20 minutes.
Page 35: Tube Refrigerant Recovery Control
3WAY SYSTEM 3WAY VRF SYSTEM 7. Tube Refrigerant Recovery Control 7. Tube Refrigerant Recovery Control Control Functions Control Functions This control is intended to recover refrigerant if refrigerant has accumulated somewhere in the tubing when the units have been stopped for long periods, as well as to compensate for tubing thermal loss during heating start, and is also used for oil recovery.
Page 36 3WAY VRF SYSTEM 3WAY SYSTEM 7. Tube Refrigerant Recovery Control Control Functions 7. Tube Refrigerant Recovery Control Control Functions Control when outdoor unit heat exchanger is acting as an evaporator (when all units are in heating mode or at start of mixed operation when heating load is high) >...
Page 37: Oil Control
3WAY SYSTEM 3WAY VRF SYSTEM 8. Oil Control 8. Oil Control Control Functions Control Functions 8-1. Oil Level Oil level Meaning Conditions of oil Judgement Sufficient The compressor contains sufficient oil. There is no problem. Confirm that oil is returned after Slightly low There will be a risk of oil shortage soon.
Page 38 3WAY SYSTEM 3WAY VRF SYSTEM 8. Oil Control Control Functions 8. Oil Control Control Functions 8-5. System Oil Recovery Control Special control : System Oil Recovery Control features one of the functions of special control. 8-5-1. Start of system oil recovery control When operating compressor oil level 0 When operating inverter compressor oil level less than 1 is counted with accumulation for up to 60 minutes.
Page 39 3WAY SYSTEM 3WAY VRF SYSTEM 8. Oil Control 8. Oil Control Control Functions Control Functions 8-6. Oil Rotation Control The oil rotation control system regularly exchanges oil among the outdoor units regardless of oil level. Oil rotation control is performed every one hour with accumulated operation time among the connected multiple outdoor units only.
Page 40: Defrost Control
3WAY VRF SYSTEM 3WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions Control Functions 9-1. Defrost Methods This system uses the following 2 defrosting systems. System employs Defrost control method 1 outdoor unit in the refrigerant system Reverse cycle defrost 2 or more outdoor units in the refrigerant system Outdoor unit cycle defrost 9-2.
Page 41 3WAY VRF SYSTEM 3WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions Control Functions 9-3. Frost Detection Frost detection does not occur for 5 minutes after operation starts. (2) Frost is detected when either condition 1 or 2 below is met. Condition 1: L2 line or below is detected twice, each time continuously for 4 minutes, when the compressor is operating.
Page 42 3WAY SYSTEM 3WAY VRF SYSTEM 9. Defrost Control 9. Defrost Control Control Functions Control Functions Reverse cycle defrost process This reverse cycle defrost process is performed after outdoor units, indoor units and solenoid valve kits are changed to the cooling cycle. Minimum 1 minute –...
Page 43 3WAY VRF SYSTEM 3WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions Control Functions 9-5. Outdoor Unit Cycle Defrost Outdoor unit cycle defrost is performed in systems where 2 or more outdoor units are connected to the refrigerant system. With this defrost method, when 1 outdoor unit operates in defrost mode (heat exchanger operating as a condenser), another outdoor unit operates as an evaporator in the same way as in ordinary heating mode.
Page 44 3WAY VRF SYSTEM 9. Defrost Control Control Functions : Evaporator operation : Condenser operation : Stop or shut off the refrigerant E→C : Switching from evaporator operation to condenser operation C→E : Switching from condenser operation to evaporator operation Outdoor unit cycle defrost processing Outdoor Normal Normal...
Page 45 3WAY VRF SYSTEM 9. Defrost Control Control Functions ● Indoor unit (expansion valve, solenoid valve kit, fan) Outdoor unit cycle defrost processing Normal Normal Indoor unit operation operation delay-start Defrost Switch Defrost Switch control group group Mode Thermostat Stop *1(Cooling) *2(Heating) *1(Cooling) Expansion...
Page 46: Discharge Tube Accumulated Refrigerant Recovery Control
3WAY VRF SYSTEM 10. Discharge Tube Accumulated Refrigerant Control Functions Recovery Control 10-1. Start of Discharge Tube Accumulated Refrigerant Recovery Control When any of them is completed, this control is implemented. (1) More than 90 minutes, more than one indoor unit for judgment of discharge tube accumulated refrigerant (2) More than 60 minutes, indoor unit for judgment of discharge tube accumulated refrigerant : Indoor unit total amount ≥...
Page 47: Upper Current Limitation Mode (Demand Control)
3WAY SYSTEM 3WAY VRF SYSTEM 10. Upper Current Limitation Mode (Demand control) 11. Upper Current Limitation Mode (Demand control) Control Functions Control Functions There are 2 types of control; demand control and infinity limit in the upper current limitation mode. Either of them is controlled by the lower current limitation.
Page 48 3WAY SYSTEM 3WAY VRF SYSTEM 10. Upper Current Limitation Mode (Demand control) Control Functions 11. Upper Current Limitation Mode (Demand control) Control Functions 11-2. Upper Current Limitation Mode Even if the demand control is not performed, upper current limitation is restricted. Type of outdoor Unit Limited ratio against standard value 140%...
Page 49: Backup Operation
3WAY SYSTEM 3WAY VRF SYSTEM 12. Backup Operation Control Functions 12. Backup Operation Control Functions 12-1. Automatic Backup Operation This system includes a function for automatic backup operation. An alarm is displayed on the remote controller to inform the user that a failure has occurred. 12-1-1.
Page 50 3WAY SYSTEM 3WAY VRF SYSTEM 12. Backup Operation Control Functions 12. Backup Operation Control Functions Alarm list 2 (Backup operation continues as long as the problems are not solved.) Alarm display DISCH1 thermistor at the discharge of 1st compressor reading is abnormal DISCH2 thermistor at the discharge of 2nd compressor reading is abnormal EXG1 thermistor at the gas side of 1st heat exchanger of the outdoor unit has failure (EXG1)
Page 51 2WAY VRF SYSTEM 3WAY VRF SYSTEM 11. Backup Operation Control Functions 12. Backup Operation Control Functions 12-1-4. Check for blinks when automatic backup setting When operating the automatic backup by setting the outdoor unit EEPROM, blink check on the remote controller and centralized control systems is enabled to change for non-displayed.
Page 52 2WAY VRF SYSTEM 3WAY VRF SYSTEM 11. Backup Operation 12. Backup Operation Control Functions Control Functions All compressors of outdoor unit number 2 are backed up Examples: Combination of 3 outdoor units with 2 compressors Unit No. 1 Unit No. 2 Unit No.
Page 53: Other Functions
3WAY SYSTEM 3WAY VRF SYSTEM 13. Other Functions Control Functions 13. Other Functions Control Functions 13-1. Maintenance Function for Power Supply Stop of Indoor Unit (E06 ignore) The system can continue operation even if outdoor unit cannot communicate with some indoor units. It is necessary to set to EEPROM the allowed number of operating indoor units not to be able to communicate.
Page 54 3WAY VRF SYSTEM 13. Other Functions Control Functions 13-2. Setting when at Thermostat OFF 13-2-1. Thermostat OFF in cooling mode When decreasing the indoor airflow volume at the cooling thermostat OFF or dry thermostat OFF, follow the setting procedure below. EEPROM setting in main outdoor unit CODE: ED Indoor unit...
Page 55: Detailed Settings In Eeprom Of Outdoor Unit
3WAY VRF SYSTEM 14. Detailed Settings in EEPROM of Outdoor Unit Control Functions Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No. 0=No sensor & control (P) 1=Sensor & control Operation for using snowfall sensor 2=No Sensor &...
Page 56 3WAY VRF SYSTEM 14. Detailed Settings in EEPROM of Outdoor Unit Control Functions Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No. Actuation of solenoid valve kit 0=Invalid (P), 1=Valid (EP closed) 0=Continuously set OFF (P) 1=Refrigerant leak prevention (normal OFF) C1 O...
Page 57: Outdoor Unit Control Pcb
3WAY VRF SYSTEM 1. Outdoor Unit Control PCB 15. Outdoor Unit Control PCB Control Functions 15-1. Outdoor Unit Control PCB CR-72MF2U9 / A748186 (U-72MF2U9 / U-96MF2U9) Terminal pin HIC3 ( CN43 ) ( CN67 ) RC1 plug ( CN75 )
Page 58 PCB and Functions 3WAY VRF SYSTEM 1. Outdoor Unit Control PCB 15. Outdoor Unit Control PCB Control Functions 15-2. Outdoor Unit Control PCB CR-144MF2U9 / A748187 (U-120MF2U9 / U-144MF2U9) Terminal pin HIC7 ( CN78 ) HIC3 ( CN43 ) ( CN67 ) RC1 plug ( CN75 ) OC plug...
Page 59 PCB and Functions 3WAY VRF SYSTEM 1. Outdoor Unit Control PCB 15. Outdoor Unit Control PCB Control Functions 15-3. Outdoor Unit HIC PCB A747843 (U-72MF2U9 / U-120MF2U9 / U-144MF2U9) 15-4. Outdoor Unit HIC PCB A747846 (U-96MF2U9) 1 - 51...
Page 60 1. Outdoor Unit Control PCB 15. Outdoor Unit Control PCB Control Functions 15-5. Outdoor Unit Filter PCB A747842 A747845 (U-72MF2U9 / U-120MF2U9 / U-144MF2U9) (U-96MF2U9) 15-6. Outdoor Unit FAN PCB A747844 (U-72MF2U9 / U-96MF2U9 / U-120MF2U9 / U-144MF2U9) 1 - 52...
Page 61 PCB and Functions 3WAY VRF SYSTEM 1. Outdoor Unit Control PCB 15. Outdoor Unit Control PCB Control Functions 15-7. Functions (for A748186, A748187) A. ADD pin (2P, White) Auto address setting pin (CN30) • Short-circuit this pin for 1 second or longer to automatically set the addresses at the indoor units that are connected to that outdoor unit and are within the same system.
Page 62 1. Outdoor Unit Control PCB PCB and Functions 3WAY VRF SYSTEM 1. Outdoor Unit Control PCB 15. Outdoor Unit Control PCB Control Functions Terminal pin (3P, Black) For communications circuit impedance matching (CN67) • A connecting socket (2P, White) is attached to the terminal pin at the time of shipment from the factory.
Page 63 3WAY VRF SYSTEM PCB and Functions 1. Outdoor Unit Control PCB 15. Outdoor Unit Control PCB Control Functions Table 1. Setting the System Address [SW1: Rotary switch (Black), SW2: 2P DIP (Black)] SW2 setting SW2 setting Outdoor Outdoor system system setting setting address...
Page 64 – MEMO – 1 - 56...
Page 65: Outdoor Unit Repair Procedures
2WAY VRF SYSTEM 3WAY VRF SYSTEM Contents Contents Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 2. OUTDOOR UNIT REPAIR PROCEDURES Removing Panels ............Discharging Compressor Oil .
Page 66: Removing Panels
2WAY VRF SYSTEM 3WAY VRF SYSTEM 1. Removing Panels Outdoor Unit Repair Procedures 1. Removing Panels Outdoor Unit Repair Procedures Be sure to turn off the power before maintenance work. CAUTION Then start working when 5 minutes or longer has passed after turning off the power. (1) Front panels removal •...
Page 67: Discharging Compressor Oil
2WAY VRF SYSTEM 3WAY VRF SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures 2. Discharging Compressor Oil Outdoor Unit Repair Procedures Sampling of discharged oil can be used for checking the condition of the system. Based on the appearance and color of the discharged oil, a judgment can be made on whether the system is operating normally or not.
Page 68 2WAY VRF SYSTEM 3WAY VRF SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures 2. Discharging Compressor Oil Outdoor Unit Repair Procedures 2-2. Discharging Oil in Compressor Recover the refrigerant in the outdoor unit following the procedures in “4. Recovering Refrigerant.” Remove the compressor and discharge the oil in it.
Page 69: Backup Operation
2WAY VRF SYSTEM 3WAY VRF SYSTEM 3. Backup Operation Outdoor Unit Repair Procedures 3. Backup Operation Outdoor Unit Repair Procedures This system includes an emergency automatic backup function that allows the air conditioner to operate during the period after trouble occurs until repairs are made. However, during repair and at other times, use manual backup operation.
Page 70 2WAY VRF SYSTEM 3WAY VRF SYSTEM 3. Backup Operation Outdoor Unit Repair Procedures 3. Backup Operation Outdoor Unit Repair Procedures After recovery work is completed, wire the communication lines between indoor and outdoor CAUTION units again. If it not finished yet, an alarm is emitted immediately. (2) Adjusting the refrigerant for backup operation During backup operation, all of the service valves on the failed unit are closed.
Page 71: Recovering Refrigerant
2WAY VRF SYSTEM 3WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures The following equipment and tools are required: Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410A only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and outdoor unit maintenance remote controller.
Page 72 2WAY VRF SYSTEM 3WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures Type: 120, 144 Low-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) High-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) Oil balance tube service port (For ø5/16”...
Page 73 2WAY VRF SYSTEM 3WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-2-1. Cooling operation (for all units) (1) If the remote controller is used for maintenance of the outdoor unit 1. Connect the outdoor unit maintenance remote controller to the RC connector (3P) (BLU) (CN73) on any one of the outdoor unit control PCBs.
Page 74 2WAY VRF SYSTEM 3WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-2-3. Refrigerant recovery procedures (2): (Indoor unit with no ball valve equipped) Refrigerant in all indoor units and the refrigerant tubing circuit must be pumped into the outdoor unit. The maximum refrigerant storage capacity per a single outdoor unit is approx.
Page 75 2WAY VRF SYSTEM 3WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures Type: 72, 96 Low-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) Manifold gauge High-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) Oil balance tube service port Refrigerant (For ø5/16”...
Page 76: Checking For Leakage After Repair
2WAY VRF SYSTEM 3WAY VRF SYSTEM 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures 5-1. Pressure Check for Leakage of Outdoor Unit After completing repair of the outdoor unit, carry out the following leakage check. (1) Check that all service valves for suction tube, discharge tube, liquid tube, and balance tube in the repaired outdoor unit (units necessary to carry out the pressurized leak check) are fully closed.
Page 77: Evacuating System
2WAY VRF SYSTEM 3WAY VRF SYSTEM 6. Evacuating System Outdoor Unit Repair Procedures 6. Evacuating System Outdoor Unit Repair Procedures This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in the repaired outdoor unit and tube. 6-1.
Page 78: Charging Compressor Oil
2WAY VRF SYSTEM 3WAY VRF SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7-1. If Refrigerant Has Already Been Charged to Outdoor Unit Be sure to use an exclusive oil-charging tank for charging compressor oil. Prior to charging, carry out vacuum drying inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank.
Page 79 2WAY VRF SYSTEM 3WAY VRF SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil Outdoor Unit Repair Procedures (2) Charging compressor oil into oil-charging tank Connect a piece of pipe to the lower valve and then insert the other end deeply into the bottom of the oil con- tainer.
Page 80 2WAY VRF SYSTEM 2WAY VRF SYSTEM 3WAY VRF SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil 7. Charging Compressor Oil Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures Type: 120, 144 Low-pressure outlet port (for ø5/16” (ø7.94mm)- dia connector) Upper side valve...
Page 81 3WAY VRF SYSTEM 2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil Outdoor Unit Repair Procedures Next, follow the instructions in “4-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged, and start cooling operation at all units.
Page 82 7-3. If Outdoor Unit Has Not Been Charged with Refrigerant The rated amount of oil is pre-charged in the compressors as given below: Pre-charged amount of oil (liter) Model name Compressor model Q'ty gallon liter U-72MF2U9 C-9RVN393H0M 0.502 U-96MF2U9 C-9RVN393H0N 0.502 0.502 C-9RVN393H0M...
Page 83: Pumping Out Refrigerant From Outdoot Unit
2WAY VRF SYSTEM 3WAY VRF SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves for the refrigerant R410A, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flat-head screwdriver, and outdoor unit maintenance remote controller.
Page 84 2WAY VRF SYSTEM 3WAY VRF SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (4) Use the outdoor unit maintenance remote controller to check the operating status of the indoor units. Check that all units are operating in Heating mode.
Page 85 2WAY VRF SYSTEM 3WAY VRF SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8-2. If Remote Controller is Not Available for maintenance of Outdoor Unit See “3.
Page 86 2WAY VRF SYSTEM 3WAY VRF SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (6) Close the discharge tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube service valve.
Page 87: Compressor
2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-1. Compressor Trouble Diagnosis and Check Methods Generally, compressor failures can be classified into the following categories. (1) Mechanical trouble → (A) Locking (intrusion of foreign objects, galling, etc.) (B) Pressure rise failure (damaged valve, seal, bearing, or other component) (C) Noise (damaged stator rotor, valve, or other component) (2) Electrical trouble →...
Page 88 2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-2. Replacing the Compressor(s) 9-2-1. Replacing only the failed compressor (1) If backup operation is required, follow the instructions in “3. Backup Operation” and engage backup operation. (2) Follow the instructions in “9-3.
Page 89 2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-2-2. Replacing all compressors in a failed unit (1) Follow the instructions in “2. Discharging Compressor Oil” and drain the oil from the oil separator in the failed unit.
Page 90 2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-2-3. Replacing all compressors in a system (1) Follow the instructions in “2. Discharging Compressor Oil” and drain the oil from the oil separators in all outdoor units.
Page 91 2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-2-4. Dry core cleaning If burning or other failures occur repeatedly at compressors within the same system, in many cases the cause is acid, sludge, carbon, or other substances that remain in the refrigeration cycle as the result of insufficient cleaning.
Page 92 2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures (13) If the results show that dry core cleaning is still necessary (for example, a color phase of 4.0 or higher)*, return to Step (11) and repeat until the results are normal (including a color phase of 3.5 or less)*. * Color sample sheet for degree of stain Perform another dry core replacement after approximately 30 hours of system operation.
Page 93 2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-3. Removing and Installing Compressors When removing and installing compressors, use sufficient caution to ensure that moisture or other substances do not enter the refrigerant tubing system. 9-3-1.
Page 94 2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures (6) Disconnect the tube-with-flare-nut using two adjustable wrenches. At this time, cover the tube in place with waste cloth while watching out for oil leaks. Then cap the disconnected tube and mount the flare nut on the compressor.
Page 95 2WAY VRF SYSTEM 3WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures Installation (1) Remove the rubber stopper and tube cap (brazed) from the new compressor. (2) Install the crankcase heater onto the new compressor. (3) Temporary attach 3 pieces of cushioning rubber with the bolts in the designated positions on the compressor.
Page 96: Replacing Peripheral Parts Of Fusible Plug
2WAY VRF SYSTEM 2WAY VRF SYSTEM 3WAY VRF SYSTEM 10. Replacing Peripheral Parts of Fusible Plug 10. Replacing Peripheral Parts of Fusible Plug Outdoor Unit Repair Procedures 10. Replacing Peripheral Parts of Fusible Plug Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures If the fusible plugs are affected by the heat, refrigerant leaks may occur.
Page 97: High And Low Pressure Sensors
2WAY VRF SYSTEM 2WAY VRF SYSTEM 3WAY VRF SYSTEM 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures 11. High and Low Pressure Sensors 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures The connection ports for the high and low pressure sensors do not employ Schrader-type push-to-release valves.
Page 98 2WAY VRF SYSTEM 2WAY VRF SYSTEM 3WAY VRF SYSTEM 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures 11. High and Low Pressure Sensors 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures Type: 120, 144 Low Pressure Sensor High Pressure Sensor 2 - 34...
Page 99: Outdoor Unit Maintenance Remote Controller
3WAY VRF SYSTEM Contents Outdoor Unit Maintenance Remote Controller 3. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER In the case of CZ-RTC2 1. Overview ............. . 3-2 2.
Page 100: Overview
3WAY VRF SYSTEM 1. Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC2) for 3WAY VRF n About the outdoor unit maintenance remote controller The outdoor unit utilizes nonvolatile memory (EEPROM) on its PCB. This allows EEPROM data to replace the setting switches that were present on previous PCBs.
Page 101: Functions
3WAY VRF SYSTEM 2. Functions Outdoor Unit Maintenance Remote Controller n Functions on the ordinary display (1) Functions: Button operations can be used to perform the following functions. • Start/stop of all indoor units • Switching between cooling and heating •...
Page 102: Ordinary Display Controls And Functions
3WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Functions on the ordinary display • Connect the special service checker wiring to the outdoor unit PCB. The connection is shown in the figure below. Outdoor unit PCB RC (3P, BLU) PCB connector (3P, BLU)
Page 103 3WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller All units start/stop (Fig. 1) <Operation> (ON/OFF operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. •...
Page 104 3WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Display (functions) • Use the temperature setting buttons to change the item code. â Item code ê Item Remarks Outdoor unit alarm Alarm code display No.
Page 105 3WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller XX-YY R.C. ô Locations where â , ê , and ô are displayed Displays the outdoor unit sub-bus address which is as shown in Fig. 4. currently selected.
Page 106 3WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Concerning the 7-segment, 4-digit display remote controller timer display The unit Nos. of connected units are indicated by four 7-segment digits ( ) and a colon. Display of unit Nos.
Page 107: Monitoring Operations
3WAY VRF SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> â Press and hold the (CHECK) button and buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, illuminates.
Page 108 3WAY VRF SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display of unit No. 1 (main unit) Description Remarks Indoor unit intake temp. (TA) °C Indoor unit heat exchanger temp. E1 (E1) °C — Indoor unit heat exchanger temp. E3 (E3) °C Indoor unit Discharge air temp.
Page 109: Outdoor Unit Alarm History Monitor
3WAY VRF SYSTEM 5. Outdoor Unit Alarm History Monitor Outdoor Unit Maintenance Remote Controller • Displays outdoor unit alarms only. • Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device. <Operating procedure> Press and hold the (CHECK) button and â...
Page 110: Mode Settings
3WAY VRF SYSTEM 6. Mode Settings Outdoor Unit Maintenance Remote Controller n Setting mode 1 Display of first 3 digits <Operating procedure> â Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer. ê Press the temperature setting buttons to change the item code.
Page 111 3WAY VRF SYSTEM 6. Mode Settings Outdoor Unit Maintenance Remote Controller n Setting mode 2 <Operating procedure> â Press and hold the (CHECK) button, button, and button simultaneously for 4 seconds or longer. ê Press the temperature setting buttons to change the item code.
Page 112: Overview
3WAY VRF SYSTEM 7. Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC4) for 3WAY VRF n About the outdoor unit maintenance remote controller The outdoor unit utilizes nonvolatile memory (EEPROM) on its PCB. This allows EEPROM data to replace the setting switches that were present on previous PCBs.
Page 113: Functions
3WAY VRF SYSTEM 8. Functions Outdoor Unit Maintenance Remote Controller n Functions on the ordinary display (1) Functions: Button operations can be used to perform the following functions. • Start/stop of all indoor units • Switching between cooling and heating •...
Page 114: Ordinary Display Controls And Functions
3WAY VRF SYSTEM 9. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Functions on the ordinary display • Connect the special service checker wiring to the outdoor unit PCB. The connection is shown in the figure below. Outdoor unit PCB When connecting the special service (3P, BLU)
Page 115 3WAY VRF SYSTEM 9. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller All units start/stop (Fig. 8) <Operation> (Start/Stop operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. •...
Page 116 3WAY VRF SYSTEM 9. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Display (functions) • Use the temperature setting buttons to change the item code. À Item code Á Item Remarks Outdoor unit alarm Alarm code display No.
Page 117 3WAY VRF SYSTEM 9. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller Â XX-YY R.C. Locations where À Á , and Â are displayed as Displays the outdoor unit sub-bus address which is shown in Fig. 11. currently selected. XX = Outdoor system address on main bus line (1 –...
Page 118 3WAY VRF SYSTEM 9. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Concerning the 7-segment, 4-digit display remote controller timer display The unit Nos. of connected units are indicated by four 7-segment digits ( ) and a colon. Display of unit Nos.
Page 119: Monitoring Operations
3WAY VRF SYSTEM 10. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> Press and hold the (Check) button and À buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, is illuminates.
Page 120 3WAY VRF SYSTEM 10. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display of unit No. 1 (main unit) Description Remarks Indoor unit intake temp. (TA) °C Indoor unit heat exchanger temp. E1 (E1) °C — Indoor unit heat exchanger temp. E3 (E3) °C Indoor unit Discharge air temp.
Page 121: Outdoor Unit Alarm History Monitor
3WAY VRF SYSTEM 11. Outdoor Unit Alarm History Monitor Outdoor Unit Maintenance Remote Controller • Displays outdoor unit alarms only. • Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device. <Operating procedure> Press and hold the (Check) button and À...
Page 122: Mode Settings
3WAY VRF SYSTEM 2WAY SYSTEM 12. Mode Settings 6. Mode Settings Outdoor Unit Maintenance Remote Controller Outdoor Unit Maintenance Remote Controller Display of ﬁ rst 3 digits Setting mode 1 <Operating procedure> Press and hold the (Check) button and (Ventilation) button simultaneously for 4 seconds or longer.
Page 123: Remote Controller Functions
3WAY VRF SYSTEM Contents Remote Controller Functions 4. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function ..........4-2 2.
Page 124: Simple Settings Function
3WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions • This allows the filter lifetime, operating mode [Remote Controller Functions Section] priority change, central control address, and other settings to be made for an individual or group- control indoor unit to which the remote controller used for simple settings is connected.
Page 125 3WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions <Procedure of CZ-RTC3 / CZ-RTC5> 20:30 (THU) START CZ-RTC3 / CZ-RTC5 Fig. 2 Select the “Code no.” by pressing the button. Keep pressing the Change the “Code no.” by pressing the buttons simultaneously for 4 or more seconds.
Page 126 3WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions <Procedure of CZ-RTC4> 1 Press and hold the buttons simultaneously for 4 seconds or longer. 2 “ ”, unit No. “ ” (or “ ” in the case ° of group control), item code “ ”, and settings °...
Page 127 3WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions List of Simple Setting Items Setting data Item code Item Description 0000 Not displayed 0001 150 hours 0002 2,500 hours Filter sign ON time (filter lifetime) 0003 5,000 hours 0004 10,000 hours 0005 Use the filter clogging sensor.
Page 128 3WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions Simple setting items Item code Item Description Filter sign ON time setting Changes the indoor unit filter lifetime when a high-performance filter or other (filter lifetime) optional product is installed. Reduces the filter sign ON time to 1/2 of the standard time (setting at the time of Degree of filter fouling shipping) for cases when filter fouling is more severe than normal.
Page 129 3WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions Item code Item Description Set when using a central control device. Central control address Used when setting the central control address manually from the remote controller. Operating mode priority change Note (1) NOTE (1) Explanation of operation mode priority change...
Page 130 3WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions When the operating mode at the priority remote controller is changed, the operating modes of other remote controllers change as shown below. Mode change at priority remote controller Operating modes at other remote controllers Current mode New mode Current mode...
Page 131: Detailed Settings Function
3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions • This allows the system address, indoor unit address, and other settings to be made for the individual or group-control indoor unit to which the remote controller used for detailed settings is connected.
Page 132 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions <Procedure of CZ-RTC3 / CZ-RTC5> 20:30 (THU) START CZ-RTC3 / CZ-RTC5 Fig. 5 Select the “Code no.” by pressing the Keep pressing the button. buttons simultaneously for 4 or more seconds. Change the “Code no.”...
Page 133 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions <Procedure of CZ-RTC4> 1 Press and hold the buttons simultaneously for 4 seconds or longer. 2 “ ”, unit No. “ ”, item code “ ”, and ° settings data “ ”...
Page 134 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions List of Detailed Setting Items Setting data Item code Item Description Description Description Concealed Duct-Medium 4-Way Cassette 36"×36" (U2) Static (F2) 0000 1-Way Cassette (D1) 0001 0005 Concealed Duct-Low 4-Way Cassette 24"×24" (Y2) Static (M2) Type Concealed Duct - High...
Page 135 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 5 minutes (1B) Forced thermostat ON time 0001 4 minutes –010 Shifts discharge temperature setting 20°F down. –009 Shifts discharge temperature setting 18°F down. Cooling discharge –008 Shifts discharge temperature setting 16°F down.
Page 136 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 No forced operation 0001 Forced operation for 1 minute Automatic drain pump operation 0060 Continuous operation 0000 None Ventilation fan operation 0001 Ventilation fan operated by remote controller. Wired remote controller 0000 Not used.
Page 137 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description DC fan tap operating Purpose mode 0000 Standard Standard (setting at shipment) High ceiling use High ceiling setting 1 (with standard panel) 0001 For low Ultra long-life filter, oil guard panel, ammonia deodorizing static-pressure filter filter, optical regenerative deodorizing filter...
Page 138 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description Unit type Set when the indoor unit EEPROM memory is replaced during servicing. Indoor unit capacity System (outdoor unit) address These are not set at the time of shipping from the factory. Indoor unit address These must be set after installation if auto address setting is not performed.
Page 139 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description 1F (Upper limit) Cooling 20 (Lower limit) 21 (Upper limit) This setting changes the temperature range (upper limit and lower limit) Heating 22 (Lower limit) Change to the remote which is set from the remote controller or central control device.
Page 140 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions (Continued from previous page) Item code Item Description Heat exchanger temperature for The heat exchanger temperature control point for prevention of cold air cold air discharge discharge during heating operation can be changed. The indoor unit PCB optional output for the fan can be switched Fan output switching according to the purpose of use.
Page 141 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions ExTERNAL STATIC PRESSURE SETTINg • Concealed Duct-Medium Static (S-07～54MF2U6) For concealed duct-medium static type indoor units, the ventilating resistance so-called “external static pressure” becomes greatly different depending on the connected duct length, shape, number of air outlet ports and types of filters.
Page 142 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions NOT E (1) Check the following items before performing the setting-check operations or auto airflow volume operations. 1) Check to make sure that the electrical wiring and ducting have been completed. Activate the stand-by mode. In particular, make sure that the closed damper located in the middle of the duct is open, if installed.
Page 143 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-2. Operating the Timer Remote Controller (CZ-RTC2) Table 2 Setting the external static pressure 1-2-1. How to set the external static pressure Indoor unit Item code 1. Press and hold down the buttons 7, 9, 12, 15, 18, 24 36, 48, 54...
Page 144 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-3. Operating the High-spec Wired Remote Detailed settings 20:30 (THU) Controller (CZ-RTC3 / CZ-RTC5) Unit no. Code no. Set data 0001 Sel. Next 20:30 (THU) 4. Select the “Set data” by pressing the button.
Page 145 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Auto External Static Pressure Setting Operation 9. Press the button. Test run will be started. Test run setting mode screen appears on the LCD 6. Keep pressing the display. buttons simultaneously for 4 or more seconds. The “Maintenance func”...
Page 146 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-4. Operating the Timer Remote Controller Table 3 Setting the external static pressure (CZ-RTC4) Indoor unit Item code 1-4-1. Setting Item Code “ ” 7, 9, 12, 15, 18, 24 36, 48, 54 Press and hold down the buttons...
Page 147: Indoor Fan Performance
3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Indoor Fan Performance Item code “ ” M M M M M M M L L L L L L L L 1 -2 L L L L 1 -3 Type 7, 9, 12 and 15 Type 36 in.WC (Pa)
Page 148 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions • Concealed Duct-Low Static (S-07～18MM2U6) Choose one of the methods (selection of “a”, “b”, “c” within the range of dotted line as shown in the flowchart below) and make settings. a.
Page 149 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-5. How to Set on PC Board Table 4 External static pressure 1. Turn off the power breaker to halt the supply of Type electricity to the PC board. in.WC 0.04 0.06 0.06...
Page 150 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-7. Operating the High-spec Wired Remote Detailed settings 20:30 (THU) Controller (CZ-RTC3 / CZ-RTC5) Unit no. Code no. Set data Sel. Next 20:30 (THU) 4. Select the “Set data” by pressing the button.
Page 151 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-8. Operating the Timer Remote Controller Table 6 Setting the external static pressure (CZ-RTC4) Indoor unit Item code 1-8-1. Setting Item Code “ ” External static pressure of the rated air flow Press and hold down the buttons volume...
Page 152 3WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions External static pressure’s upper limit in high static pressure mode Standard external static Rated external static pressure pressure’s upper limit in high static pressure mode Lower static pressure in high static pressure mode Rated external static pressure at shipment...
Page 153 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions • The remote controller includes a number of servicing functions. Use these as needed for test runs and inspections. CZ-RTC2 Fig. 11 List of Servicing Functions Functions Description Button operation Reset operation Unit status Operation with...
Page 154: Remote Controller Servicing Functions
2WAY SYSTEM 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Remote Controller Functions <Function of CZ-RTC3 / CZ-RTC5> Display of "maintenance function" screen 1 Keep pressing the buttons simultaneously for 4 or more seconds. Maintenance func 20:30 (THU) The “Maintenance func”...
Page 155 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions • The remote controller includes a number of servicing functions. Use these as needed for test runs and Timer Remote Controller CZ-RTC4 inspections. CZ-RTC4 Fig. 13 List of Servicing Functions Functions Description Button operation...
Page 156 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure of CZ-RTC2> â Press and hold the button for 4 seconds or longer. ê “TEST” appears on the remote controller LCD display (Fig.
Page 157 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC3 / CZ-RTC5> 1 Keep pressing the 20:30 (THU) buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display. Maintenance func 20:30 (THU) START 1.
Page 158 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC4> Operates the unit with the thermostat forced ON. 1 Press and hold the button for 4 seconds or longer. 2 “ ” appears on the remote controller LCD °...
Page 159 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions n Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) The procedure below displays the sensor temperatures from the remote controller, indoor unit, and outdoor unit on the remote controller. <Procedure of CZ-RTC2>...
Page 160 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC3 / CZ-RTC5> Keep pressing the buttons simultaneously for 4 or more seconds. Sensor info. 20:30 (THU) The “Maintenance func” screen appears on the Unit no. Code no. Data LCD display.
Page 161 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC4> Press and hold the buttons simultaneously for 4 seconds or longer. The unit No. “X-X” (main unit No.), item code “ ” (sensor address), and servicing monitor “ ”...
Page 162 3WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Outdoor unit sensors Indoor unit sensors Unit No.1 Unit No.2 Unit No.3 Room temp. controlled * Discharge temp. 1st compressor (DISCH1) Remote controller temp. Discharge temp. 2nd compressor (DISCH2) High-pressure sensor temp.
Page 163: Trouble Diagnosis
3WAY VRF SYSTEM 2WAY SYSTEM Contents Contents Trouble Diagnosis Trouble Diagnosis 5. TROUBLE DIAGNOSIS 5. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......5-2 2.
Page 164: Contents Of Remote Controller Switch Alarm Display
3WAY VRF SYSTEM 1. Contents of Remote Controller Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Serial communi- Remote controller is detecting Indoor unit does not respond to remote controller. <E01>...
Page 165 3WAY VRF SYSTEM 1. Contents of Remote Controller Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Thermistor fault Outdoor thermistor is either SCT thermistor at the suction refrigerant of compressors has open or damaged.
Page 166: Outdoor Unit Control Panel Led Display
3WAY VRF SYSTEM 2. Outdoor Unit Control Panel LED Display Trouble Diagnosis : ON : Blinking : OFF) LED (RED) Display meaning After the power is turned ON (and auto address setting is not in progress), no communication with the indoor units in that system is possible. (Both ON) After power is turned ON (and auto address setting is not in progress), one or more indoor units are confirmed in that system;...
Page 167: Way Alarm Codes
3WAY VRF SYSTEM 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis With types 72 and 96, only one INV compressor is supplied. With types 120 and 144, two INV compressors are supplied. Alarm code Alarm meaning Page Some indoor units does not respond to outdoor unit.
Page 168 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis Alarm code Alarm meaning Page 1st compressor discharge temperature too high. 5-22 Protection device activated. High pressure switch (63PH, 63PH1 or 63PH2) or compressor 5-23 thermal protector (49C1 / 49C2). Open phase in power input is detected at HIC for 1st compressor. 5-24 Open phase in power input is detected at HIC for 2nd compressor.
Page 169 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis E06 Alarm Alarm code Alarm meaning Some indoor units does not respond to outdoor unit. Alarm conditions Some indoor units does not respond to outdoor unit. Probable cause (1) The indoor unit power was cut OFF after initial communications were completed. (2) An open circuit or short-circuit occurred in the inter-unit control wiring after initial communications were completed.
Page 170 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis E16 Alarm Alarm code Alarm meaning More indoor units are found in Auto Addressing than the setting on outdoor PCB. Alarm conditions • The number of indoor units was too many when auto address setting was performed. •...
Page 171 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis E25 Alarm Alarm code Alarm meaning The outdoor unit address is duplicating. Alarm conditions Communication by outdoor unit main-sub control wiring was received that contained the same address as that unit 5 times or more within 3 minutes. Probable cause The unit number is set incorrectly.
Page 172 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis F04, F05 Alarm Alarm code F04, F05 Alarm meaning F04 : DISCH1 thermistor at the discharge of 1st compressor reading is abnormal. F05 : DISCH2 thermistor at the discharge of 2nd compressor reading is abnormal. Alarm conditions (1) Discharge temp.
Page 173 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis Check (3) Leakage from the discharge tube check valve Trouble: Although the other compressor is operating and this compressor is stopped, the discharge temperature of this compressor rises together with the temperature of the other compressor.
Page 174 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis F08 Alarm Alarm code Alarm meaning TO thermistor for outdoor ambient air temperature has failure. (TO) Alarm conditions (1) Short circuit (A/D step is 10 steps or less.) (2) Open circuit (A/D step is 1014 steps or more.) Probable cause (1) Sensor malfunction (including connector) (2) The Outdoor Unit Control PCB malfunction...
Page 175 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis F16 Alarm Alarm code Alarm meaning High pressure sensor of the outdoor unit has failure. (HPS) Alarm conditions • High-pressure sensor disconnected or open circuit. • High-pressure sensor detected over 3.6MPa continuously for 30 minutes while outdoor units stopped. •...
Page 176 2WAY SYSTEM 3WAY VRF SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis 3. 3WAY Alarm Codes Trouble Diagnosis F17 Alarm Alarm code Alarm meaning Low pressure sensor of the outdoor unit has failure. (LPS) Alarm conditions (1) Sensor short circuit (2) Sensor open circuit Probable cause (1) Sensor malfunction (including connector) (2) The Outdoor Unit Control PCB malfunction...
Page 177 2WAY SYSTEM 3WAY VRF SYSTEM 4. 2WAY Alarm Codes 3. 3WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis H03, H13 Alarm Alarm code H03, H13 Alarm meaning H03 : Current sensor for the 1st compressor is disconnected or shorted. H13 : Current sensor for the 2nd compressor is disconnected or shorted. 1st compressor, 2nd compressor When the frequency of compressor is over 35Hz and the secondary Alarm conditions current is over 7.0A, the primary current detected lower than 0.7A.
Page 178 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis H06 Alarm Alarm code Alarm meaning Low pressure is too low. Alarm conditions • Low-pressure sensor detects lower than 0.06MPa continuously for 2 minutes or lower than 0.02MPa for just a moment. Probable cause (1) Low-pressure sensor failure (2) Failure to open the service valve of the outdoor unit...
Page 179 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis H07 Alarm Alarm code Alarm meaning Low on oil or the oil recovery circuit has restriction. Alarm conditions This alarm occurs when oil does not flow for a specified amount of time in tubing where oil flow constantly.
Page 180 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis H08, H27 Alarm Alarm code H08, H27 Alarm meaning H08 : OIL1 thermistor for the oil of 1st compressor has failure. (OIL1) H27 : OIL2 thermistor for the oil of 2nd compressor has failure. (OIL2) Alarm conditions This alarm occurs when a connector connection (pins 1 and 2 for 1st compressor, and pins 4 and 5 for 2nd compressor) is open.
Page 181 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis H21, H31 Alarm Alarm code H21, H31 Alarm meaning H21 : HIC for 2nd compressor has failure. Overcurrent or overheat of HIC. H31 : HIC for 1st compressor has failure. Overcurrent or overheat of HIC. Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC temperature or other trouble) from the HIC.
Page 182 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis L10 Alarm Alarm code Alarm meaning Capacity setting of outdoor unit is not correct. Alarm conditions The outdoor unit capacity has not been set, or the setting is not allowed by the system. Probable cause This alarm occurs because the capacity has not been set.
Page 183 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis Check (1) When setting "installation of common use solenoid valve kit" is made by PC, check whether the installation change was made in the same series of all indoor units or not. (Check the software of address setting of PC.) * In this case, "L11"...
Page 184 2WAY SYSTEM 3WAY VRF SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis 3. 3WAY Alarm Codes Trouble Diagnosis P03, P17 Alarm Alarm code P03, P17 Alarm meaning P03 : 1st compressor discharge temperature too high. P17 : 2nd compressor discharge temperature too high. Alarm conditions 1st compressor : Pre-trip stops when the temperature exceeds 223°F (106°C).
Page 185 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis P04 Alarm Alarm code Alarm meaning Protection device activated. High pressure switch (63PH, 63PH1 or 63PH2) or compressor thermal protector (49C1 / 49C2). Alarm conditions À The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the pressure.
Page 186 2WAY SYSTEM 3WAY VRF SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis 3. 3WAY Alarm Codes Trouble Diagnosis P05, P15 Alarm Alarm code P05, P15 Alarm meaning P05 : Open phase in power input is detected at HIC for 1st compressor. P15 : Open phase in power input is detected at HIC for 2nd compressor.
Page 187 3WAY VRF SYSTEM 3. 3WAY Alarm Codes Trouble Diagnosis P22 Alarm Alarm code Alarm meaning Fan motor or inverter drive of outdoor unit has failure. Alarm conditions Fan motor start failure, fan motor Hall IC input failure Probable cause Possible causes are a Hall IC input circuit failure and a Fan PCB failure. Check Check the fan motor wiring, the Hall IC wiring, and the connector connections.
Page 188: Blinking Inspection Display On The Remote Controller
WARNING 3WAY VRF SYSTEM 4. Blinking Inspection Display Trouble Diagnosis on the Remote Controller Currently the blinking inspection display can be displayed only on the wired remote controller CAUTION and system remote controller. Blinking inspection display (Automatic backup) Alarm code (Blinking inspection display) Alarm meaning Automatic backup is in progress.
Page 189: Inspection And Characteristics Of Parts
3WAY VRF SYSTEM 5. Inspection and Characteristics of Parts Trouble Diagnosis (1) High-Pressure Switch (63PH1, 63PH2) 63PH1 Disconnect the CN3 connector (3P, white) from the Outdoor Unit Control PCB. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω. 63PH2 Disconnect the CN89 connector (2P, red) from the Outdoor Unit Control PCB.
Page 190 2WAY VRF SYSTEM 3WAY VRF SYSTEM 5. Inspection and Characteristics of Parts 8. Thermister Characteristics Curve Trouble Diagnosis Trouble Diagnosis (4) Characteristics of Thermistor (Indoor Unit) Intake temperature thermistor (TA) ● Temperature (˚F) ● Indoor unit heat exchanger thermistor (E1, E3) Temperature (˚F) Temperature (˚F) 5 - 28...
Page 191 2WAY SYSTEM 3WAY VRF SYSTEM 6. Inspection and Characteristics of Parts 5. Inspection and Characteristics of Parts Trouble Diagnosis Trouble Diagnosis (5) Coil Resistance of Outdoor Unit Fan Motor unit : ohm DMSBJ75SY Resistance (at 68°F) Outdoor Unit Type U - V Resistance U - W V - W...
Page 192: Test Pin
3WAY VRF SYSTEM 6. Test Pin Trouble Diagnosis When the TEST pin on the Outdoor Unit Control PCB is short-circuited, each part can be operated individually. • After turning OFF the main unit power, short-circuit the TEST pin (CN22, black), then turn the power ON. Output is performed in the sequence shown in the table below, for 0.5 seconds each.
Page 193: Symptom: Thermostat In Off Continues Or Cycles Off & On Too Frequently
Mini VRF SYSTEM 6. Symptom: Thermostat in OFF continues or Trouble Diagnosis 3WAY VRF SYSTEM 7. Symptom: Thermostat in OFF continues or cycles OFF & ON too frequently Trouble Diagnosis cycles OFF & ON too frequently How to detect abnormality •...
Page 194 – MEMO – 5 - 32...
Page 195: Test Run
3WAY VRF SYSTEM Contents Test Run 6. TEST RUN 1. Preparing for Test Run ..........6-2 2.
Page 196: Preparing For Test Run
3WAY VRF SYSTEM 1. Preparing for Test Run Test Run (4) If only 1 outdoor unit is installed, close the service 1. Preparing for Test Run valve on the balance tubes, and open the service Before attempting to start the air conditioner, valve on the other 3 tubes (suction, discharge, and check the following.
Page 197: Test Run Procedure
3WAY VRF SYSTEM 2. Test Run Procedure Test Run 2. Test Run Procedure Recheck before the test run. Notes: 1. Use caution when making the settings. If there are duplicated system addresses, or if Have outdoor sub units been connected? the settings for the number of indoor units are not consistent, an alarm will occur and the system will *1 The unit set to 1...
Page 198: Main Outdoor Unit Pcb Setting
3WAY VRF SYSTEM 3. Main Outdoor Unit PCB Setting Test Run 3. Main Outdoor Unit PCB Setting Type 72/96 Terminating resistance pin CN30 CN40 COOL HEAT MODE NO. OF I / U R. C. ADD O/U. ADD NO. OF O/U SHORT OPEN CN67 Type 120/144...
Page 199 3WAY VRF SYSTEM 3. Main Outdoor Unit PCB Setting Test Run <Sample> Outdoor unit number setting (SW5) Unit number setting (SW5) Unit number setting Notes: (3P Dip switch, Black) (1) Unit 1 (outdoor main unit) needs to prepare the settings Unit 1 (at shipment) 1: ON of “number of outdoor units”, “number of indoor units”...
Page 200: Function Switches On P.c. Board
3WAY VRF SYSTEM 4. Function Switches on P.C. Board Test Run 4. Function Switches on P.C. Board Function Switch Remarks Changes to cooling/heating mode. (outdoor main unit is only usable.) When in normal operation: When short circuited the COOL side, indoor unit operation in the same MODE pin (3P, BLK) refrigerant system changes to all cooling mode.
Page 201: Auto Address Setting
3WAY VRF SYSTEM 5. Auto Address Setting Test Run 5. Auto Address Setting Example: Basic Wiring Diagram (1) • Case of no link wiring 3P terminating (Inter-unit control wiring is not connected to a multiple system.) resistance pin Indoor unit address setting is possible without starting the compressor. (SHORT side) Unit 1 setting (outdoor main unit) * It is not necessary to control the terminating...
Page 202 3WAY VRF SYSTEM 5. Auto Address Setting Test Run Example: Basic Wiring Diagram (2) Setting of terminal pin (CN67) Refrigerant circuit No. 1 • Case of link wiring Unit No. 1 (Main) : short-circuit (at shipment) * See the section “ATTENTION!”. Unit No.
Page 203 3WAY VRF SYSTEM 5. Auto Address Setting Test Run inal check before operation Between conductors Final check must be done under the conditions of inter-outdoor unit control wiring Wire connected to the centralized control system and the resistor between conductors must be measured by a Megger.
Page 204 3WAY VRF SYSTEM 5. Auto Address Setting Test Run Case 3.a Auto Address Setting in Heating Mode In case of impossibility of turning ON power to indoor/outdoor units in each refrigerant system: Indoor unit auto address setting cannot be made unless the compressor is started. How to Control Auto Address from Outdoor Unit 1.
Page 205 3WAY VRF SYSTEM 5. Auto Address Setting Test Run Case 3.b Auto Address Setting in Cooling Mode In case of impossibility of turning ON power to indoor/outdoor units in each refrigerant system: The indoor unit auto address setting cannot be made unless the compressor is started. How to Control Auto Address from Outdoor Unit 1.
Page 206 3WAY VRF SYSTEM 5. Auto Address Setting Test Run Auto Address Setting from the High-spec Wired Remote Controller (CZ-RTC3 / CZ-RTC5) Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD 20:30 (THU) display.
Page 207 3WAY VRF SYSTEM 5. Auto Address Setting Test Run Display During Auto Address Setting On the surface of outdoor unit control P.C. board * Do not short circuit the A.ADD pin (CN30) again during auto address setting. LEDs 1 and 2 go out and address setting is interrupted. * When auto address setting is normally completed, both LEDs 1 and 2 go out.
Page 208 3WAY VRF SYSTEM 5. Auto Address Setting Test Run Checking the indoor unit addresses Use the remote controller to check the indoor unit address. CZ-RTC3 / CZ-RTC5 (High-spec wired remote controller) Keep pressing the buttons The “Simple settings” screen appears on the LCD simultaneously for 4 or more seconds.
Page 209: Setting Test Run Remote Controller
3WAY VRF SYSTEM 6. Setting Test Run Remote Controller Test Run 6. Setting Test Run Remote Controller CZ-RTC3 / CZ-RTC5 (High-spec wired remote controller) 20:30 (THU) Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display.
Page 210: Caution For Pump Down
7. Caution for Pump Down 3WAY VRF SYSTEM Test Run 8. Self-Diagnosis Function Table and Contents of Alarm Display 7. Caution for Pump Down Pump down means refrigerant gas in the system is returned to the outdoor unit. Pump down is used when the unit is to be moved, or before servicing the refrigerant circuit. See the section 2.
Page 211 3WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display • If the alarm display “E15”, “E16” and “E20” appear after auto address setting began, check the following items. Alarm display Alarm contents Recognized number of indoor units at the time of auto address setting are fewer than that of indoor units set by SW3 and SW4 on outdoor main unit P.C.
Page 212 3WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display Remote control display Alarm contents Two or more remote controllers are set as main on R1-R2 link. Auto Address failed to start. Two or more indoor units are set as main, in the group controlled indoor units. Fewer indoor units are found in Auto Addressing than the setting on outdoor PCB.
Page 213 3WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display Remote control display Alarm contents Protection device activated. High pressure switch (63PH, 63PH1 or 63PH2) or compressor thermal protector (49C1 / 49C2). Open phase in power input is detected at HIC for 1st compressor. Connection to the panel of indoor unit is not good.
Page 214 3WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display Wired remote Detected contents control display Indoor thermistor is either open or damaged. E1 thermistor on liquid side of indoor heat exchanger has failure. (E1) <<F01>> Indoor unit set as single split.
Page 215 3WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display Wired remote Detected contents control display Abnormal device function HIC for 2nd compressor has failure. Overcurrent or overheat of HIC. HIC for 1st compressor has failure. Overcurrent or overheat of HIC. •...
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