Page 1 Service Manual Installation and Operation Troubleshooting AVWT-76FESR AVWT-190FESZ AVWT-308FESZ AVWT-420FESZ AVWT-96FESR AVWT-212FESZ AVWT-324FESZ AVWT-438FESZ AVWT-114FESR AVWT-232FESZ AVWT-340FESZ AVWT-454FESZ AVWT-136FESS AVWT-250FESZ AVWT-364FESZ AVWT-476FESZ AVWT-154FESS AVWT-272FESZ AVWT-382FESZ AVWT-494FESZ AVWT-170FESS AVWT-290FESZ AVWT-398FESZ AVWT-510FESZ HHFR SM-1507 Rev.2 HHFR SM-1507 Rev.2...
Page 2: Table Of Contents
- CONTENTS - 1. Safety Summary ............................1-4 2. Structure ..............................1-7 2.1 Outdoor Unit & Refrigerant Cycle ...................... 1-7 2.2 Necessary Tools and Instrument List for Installation ................. 1-7 3. Before Installation ............................1-9 3.1 Line-Up of Outdoor Unit ........................1-9 3.2 Combination of Indoor Unit and Outdoor Unit ...................
Page 3 - CONTENTS - 9. Test Run ..............................1-65 9.1 Before Test Run ..........................1-65 9.2 Test Run ............................1-67 10. Safety and Control Device Setting ......................1-72 11. Common ..............................1-73 11.1 Caution of Outdoor Unit Installation ....................1-73 11.2 Refrigerant Piping Provision ......................1-80 11.3 Distribution Method by Manifold Pipe (Optional Parts) ..............
Page 4 - CONTENTS - 1. Initial Troubleshooting ..........................2-3 Checking of Electrical Wiring and Power Source ................2-3 Checking of Rotary Switch and Dip Switch Setting ............... 2-8 Checking by 7-Segment Display ....................2-11 Function Setting ..........................2-12 Checking of Alarm Code History ....................2-14 Emergency Operation ........................
Page 6 INSTALLATION & OPERATION Installation and Operation...
Page 7 INSTALLATION & OPERATION - CONTENTS - 1. Safety Summary ............................1-4 2. Structure ..............................1-7 2.1 Outdoor Unit & Refrigerant Cycle ...................... 1-7 2.2 Necessary Tools and Instrument List for Installation ................. 1-7 3. Before Installation ............................1-9 3.1 Line-Up of Outdoor Unit ........................1-9 3.2 Combination of Indoor Unit and Outdoor Unit ...................
Page 8 INSTALLATION & OPERATION - CONTENTS - 9. Test Run ..............................1-65 9.1 Before Test Run ..........................1-65 9.2 Test Run ............................1-67 10. Safety and Control Device Setting ......................1-72 11. Common ..............................1-73 11.1 Caution of Outdoor Unit Installation ....................1-73 11.2 Refrigerant Piping Provision ......................
Page 9: Safety Summary
INSTALLATION & OPERATION 1. Safety Summary DANGER Do not perform installation work, refrigerant piping work, drain pump, drain piping and electrical wiring ● connection without referring to our installation manual. If the instructions are not followed, it may result in a water leakage, electric shock or a fire.
Page 10 INSTALLATION & OPERATION WARNING Do not use any sprays such as insecticide, lacquer, hair spray or other flammable gases within ● approximately one (1) meter from the system. If circuit breaker or fuse is often activated, stop the system and contact your service contractor. ●...
Page 11 INSTALLATION & OPERATION NOTICE Do not install the indoor unit, outdoor unit, remote control switch and cable within approximately 3 meters ● from strong electromagnetic wave radiators such as medical equipment. Supply electrical power to the system to energize the oil heater for 12 hours before startup after a long ●...
Page 12: Structure
INSTALLATION & OPERATION 2. Structure Outdoor Unit & Refrigerant Cycle Regarding structure drawings and refrigerant cycle diagram, please refer to Technical Data in this Technical Catalog. Necessary Tools and Instrument List for Installation Tool Tool Tool Tool Handsaw Copper Pipe Bender 11 Spanner 16 Leveller Clamper for...
Page 13 INSTALLATION & OPERATION : Interchangeability is available with current R22 : only for Refrigerant R410A (No Interchangeability with R22) ◇ ● ×: Prohibited : only for Refrigerant R407C (No Interchangeability with R22) ◆ Interchangeability Reason of Non-Interchangeability and Attention with R22 Measuring Instrument and Tool : Strictly Required) ★...
Page 14: Before Installation
INSTALLATION & OPERATION 3. Before Installation Line-Up of Outdoor Unit < Base Unit > Model AVWT-76FE(7)(9)SR AVWT-96FE(7)(9)SR AVWT-114FE(7)(9)SR AVWT-136FE(7)(9)SS AVWT-154FE(7)(9)SS AVWT-170FE(7)(9)SS < Combination of Base Units > * Model AVWT-190FE(7)(9)SZ AVWT-212FE(7)(9)SZ AVWT-232FE(7)(9)SZ AVWT-250FE(7)(9)SZ AVWT-272FE(7)(9)SZ AVWT-290FE(7)(9)SZ AVWT-76FE(7)(9)SR AVWT-76FE(7)(9)SR AVWT-96FE(7)(9)SR AVWT-114FE(7)(9)SR AVWT-136FE(7)(9)SS AVWT-136FE(7)(9)SS Combination AVWT-114FE(7)(9)SR AVWT-136FE(7)(9)SS AVWT-136FE(7)(9)SS AVWT-136FE(7)(9)SS AVWT-136FE(7)(9)SS AVWT-154FE(7)(9)SS Model...
Page 15 INSTALLATION & OPERATION • The number of connectable indoor unit with outdoor unit is as follows. Comply with the condition as follows when installing the unit. • A maximum total capacity of 130% and a minimum total capacity of 50% can be obtained by combination of the indoor units when compared with the nominal outdoor unit capacity.
Page 16: Transportation And Handling
INSTALLATION & OPERATION 4. Transportation and Handling Transportation Transport the product as close to the installation location as practical before unpacking. When using a crane, hang the unit according to the description of the label attached to the outdoor unit. Do not hang the unit by the ropes at the wooden base.
Page 17: Handling Of Outdoor Unit
INSTALLATION & OPERATION • Hanging Method When hanging the unit, ensure a balance of the unit, check safety and lift up smoothly. (1) Do not remove any packing materials. (2) Hang the unit under packing condition with two (2) wire ropes, as shown in Fig. 4.1. Wire Rope Angle of wire rope Corrugated Paper Frame...
Page 18: Outdoor Unit Installation
INSTALLATION & OPERATION 5. Outdoor Unit Installation Factory-Supplied Accessories Check to ensure that the following accessories are packed with the outdoor unit. Table 5.1 Factory-Supplied Accessories Accessory Remarks Connection for Refrigerant Gas (High) Pipe 22.2→ 15.88 22.2→ 19.05 25.4→ 22.2 25.4→...
Page 19: Installation
INSTALLATION & OPERATION Installation (1) Install the outdoor unit in a dry well ventilated environment. (2) Install the outdoor unit where it is in the shade or it will not be exposed to direct sunshine or direct radiation from high temperature heat source. (3) Install the outdoor unit where the sound or the discharge air from the outdoor unit does not affect neighbors or surrounding ventilation.
Page 20: Service Space
INSTALLATION & OPERATION Service Space Make the service space when outdoor unit is installed as follows. - In case of no walls at the front and the rear side of the (Unit: mm) unit, the space of 500mm for the front side and 300mm for the rear side is required.
Page 21 INSTALLATION & OPERATION 3) Walls on 4 Directions • Single Installation No limit for side wall height. Min. 300 + h1/2 Min. 200 Min. 200 ▼ No limit for side wall height. Front Side Min. 800 Open Min. 500 + h2/2 <Top View>...
Page 22: Foundation
INSTALLATION & OPERATION Foundation • Concrete Foundations (1) The height of the foundation should be 150mm higher than the ground level. (2) Install a drainage around foundation for smooth drain. (mm) Mortar Hole 100 x Depth 150 Refrigerant Pipe Drainage more than (Width 100 x Depth 20) more than...
Page 23 INSTALLATION & OPERATION (5) When installing the outdoor unit, fix the unit by anchor bolts (field-supplied). Refer to Fig. 5.1 regarding the location of fixing holes. Unit: mm < 76kBtu/h to 114kBtu/h> < 136kBtu/h to 170kBtu/h > 4-38x15 4-38x15 Hole of Anchor Bolt Hole of Anchor Bolt Fig.
Page 24: Drain Water Treatment
INSTALLATION & OPERATION Drain Water Treatment Drain water is discharged during heating and defrosting operation. (Rain water is also discharged.) Pay attention to the followings. (1) Choose a place where well drainage is available, or provide a drain ditch. (2) Do not install the unit over the walkways. Condensation water may fall on people. In case of installing the unit in such a place, provide the additional drain pan.
Page 25: Refrigerant Piping Work
INSTALLATION & OPERATION 6. Refrigerant Piping Work Use the specified non-flammable refrigerant (R410A) to the outdoor unit in the refrigerant cycle. ● Do not charge material 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.
Page 26 INSTALLATION & OPERATION Table 6.1 Piping Size of Outdoor Unit < For Heat Pump System (2 Pipes) > (mm) Model Liquid AVWT-76FE(7)(9)SR 19.05 9.53 AVWT-96FE(7)(9)SR 22.2 9.53 AVWT-114FE(7)(9)SR 25.4 12.7 AVWT-136FE(7)(9)SS AVWT-154FE(7)(9)SS 28.6 12.7 AVWT-170FE(7)(9)SS AVWT-190FE(7)(9)SZ 28.6 15.88 AVWT-212FE(7)(9)SZ AVWT-232FE(7)(9)SZ AVWT-250FE(7)(9)SZ AVWT-272FE(7)(9)SZ AVWT-290FE(7)(9)SZ...
Page 27: Flaring And Joint
INSTALLATION & OPERATION Table 6.2 Piping Size of Indoor Unit (mm) Indoor Unit (kBtu/h) Liquid 07 to 14 12.7 6.35 17 to 18 15.88 6.35 22 to 54 15.88 9.53 19.05 9.53 22.2 9.53 • Piping Thickness and Material Use the pipe as below. (mm) R410A Diameter...
Page 28: Caution About Outdoor Unit Installation
INSTALLATION & OPERATION Caution about Outdoor Unit Installation < Outdoor Unit Alignment > Align the outdoor unit from large capacity as A > B > C and outdoor Unit “A” should be located at the indoor unit side. Outdoor Outdoor Outdoor Outdoor Unit Capacity: A >...
Page 29 INSTALLATION & OPERATION (5) For servicing, in case that the pipe is placed frontward of the outdoor unit, secure min. 500mm between the outdoor unit and manifold pipe. (When the compressor is replaced, a space of min. 500mm is required.) Outdoor Unit Outdoor Unit Outdoor Unit...
Page 30 INSTALLATION & OPERATION Piping Connection for System Heat Pump Perform the piping connection work for each outdoor unit. NOTE: Ensure that the refrigerant pipe should be connected to the same refrigerant cycle unit. ● Prepare the refrigerant pipe in the field for the piping work. Refer to Fig.
Page 31: Piping Size For Avwt-76Fe(7)(9)Sr To Avwt-170Fe(7)(9)Ss (Base Unit)
INSTALLATION & OPERATION 6.4.1 Piping Size for AVWT-76FE(7)(9)SR to AVWT-170FE(7)(9)SS (Base Unit) Outdoor Unit To Indoor Units Refrigerant Piping Model AVWT-76FE(7)(9)SR AVWT-96FE(7)(9)SR AVWT-114FE(7)(9)SR AVWT-136FE(7)(9)SS AVWT-154FE(7)(9)SS AVWT-170FE(7)(9)SS 19.05 22.2 25.4 25.4 28.6 28.6 Piping Size 9.53 9.53 12.7 12.7 12.7 15.88 Liquid 6.4.2 Piping Size for AVWT-190FE(7)(9)SZ to AVWT-340FE(7)(9)SZ (2 Units Combination) <...
Page 32: Piping Size For Avwt-364Fe(7)(9)Sz To Avwt-510Fe(7)(9)Sz (Triple Units Combination)
INSTALLATION & OPERATION 6.4.3 Piping Size for AVWT-364FE(7)(9)SZ to AVWT-510FE(7)(9)SZ (Triple Units Combination) < Figure for AVWT-364FE(7)(9)SZ > (Indoor Unit on Left Side) (Indoor Unit on Right Side) Outdoor Unit A Outdoor Unit B Outdoor Unit C Outdoor Unit C Outdoor Unit B Outdoor Unit A To Indoor Units...
Page 33: Stop Valve
INSTALLATION & OPERATION 6.4.4 Stop Valve < Gas Valve > (1) Make sure that the all the spindles are closed completely. (2) Connect the charging hose to the service port and release gas from the high pressure gas pipe. (3) Cut the end of the closing pipe ( 6.35) and check that no gas exists inside the high pressure gas pipe.
Page 34: Piping Connection
INSTALLATION & OPERATION 6.4.5 Piping Connection (1) Make sure that the stop valves are closed completely. (2) Protect the compressor and sound-proof cover with metal plate when brazing the high pressure gas pipe as shown in Fig. 6.2. Pay attention to the flame from the burner not to burn the stop valve body. (3) Connect the indoor unit and the outdoor unit with refrigerant piping.
Page 35 INSTALLATION & OPERATION ● Manifold Pipe (Optional Parts) Applicable Outdoor Unit Item Operation Type Model Remarks Outdoor Unit Outdoor Unit kBtu/h Number 190 to 232 HFQ-M22F 2 Pipes Type 250 to 340 HFQ-M32F Manifold * for Gas Pipe Heat Pump Type 364 to 398 * for Liquid HFQ-M32F+HFQ-M32F...
Page 36 INSTALLATION & OPERATION ● Branch Pipe(Optional Parts) < Line Branch > First Branch Pipe Diameter and Branch Pipe after First Branch Liquid Outdoor Unit (kBtu/h) Model Total Indoor Unit (kBtu/h) Model (fmm) (fmm) 76 to 96 HFQ-102F Lower than 57 15.88 9.53 114 to 150...
Page 37 INSTALLATION & OPERATION ● Piping Size ( mm) and Branch Pipe Selection Pipe Diameter for Outdoor Unit Main Pipe Diameter (Base Unit or Manifold Pipe 1 to First Branch) Upstream Side [Branch Pipe of First Branch] (*2) Equivalent Piping Length < 100m Outdoor Unit (kBtu/h) Outdoor Outdoor...
Page 38 INSTALLATION & OPERATION manifold pipe (*1): The is counted from the indoor unit side (as Manifold Pipe 1). (*2): When the maximum length of the equivalent refrigerant pipe (L1) from the outdoor unit/Manifold Pipe 1 to the indoor unit is over 100m, the pipe size of gas/liquid line from the outdoor unit/manifold pipe 1 to first branch should be increased one size with the reducer (field-supplied).
Page 39 INSTALLATION & OPERATION ● Piping Branch Restriction Follow the table below when performing the field-supplied piping work. Main Piping Branch * Piping Length between Indoor Unit (First Branch) Capacity Ratio Branch Pipe Piping Length Number of Main and Each Indoor Unit (L2) After Main Branch After Branch Piping Branch...
Page 40: Piping Connection For Heat Recovery System
INSTALLATION & OPERATION Piping Connection for Heat Recovery System Perform the piping connection work for each outdoor unit. NOTE: Ensure that the refrigerant pipe should be connected to the same refrigerant cycle unit. ● Prepare the refrigerant pipe in the field for the piping work. Refer to Fig.
Page 41: Piping Size For Avwt-76Fe(7)(9)Sr To Avwt-170Fe(7)(9)Ss (Base Unit)
INSTALLATION & OPERATION 6.5.1 Piping Size for AVWT-76FE(7)(9)SR to AVWT-170FE(7)(9)SS (Base Unit) Outdoor Unit To Indoor Units Refrigerant Piping Model AVWT-76FE(7)(9)SR AVWT-96FE(7)(9)SR AVWT-114FE(7)(9)SR AVWT-136FE(7)(9)SS AVWT-154FE(7)(9)SS AVWT-170FE(7)(9)SS Low Pressure 19.05 22.2 25.4 25.4 28.6 28.6 Piping High Pressure 15.88 19.05 22.2 22.2 22.2 22.2...
Page 42 INSTALLATION & OPERATION 6.5.3 Piping Size for AVWT-364FE(7)(9)SZ to AVWT-510FE(7)(9)SZ (Triple Units Combination) < Figure for AVWT-364FE(7)(9)SZ > (Indoor Unit on Left Side) (Indoor Unit on Right Side) Outdoor Unit A Outdoor Unit B Outdoor Unit C Outdoor Unit C Outdoor Unit B Outdoor Unit A To Indoor Units...
Page 43: Stop Valve
INSTALLATION & OPERATION 6.5.4 Stop Valve < Gas Valves > (1) Make sure that the all the spindles are closed completely. (2) Connect the charging hose to the service port and release gas from the high and low pressure gas pipes.
Page 44: Piping Connection
INSTALLATION & OPERATION 6.5.5 Piping Connection (1) Make sure that the stop valves are closed completely. (2) Protect the compressor and sound-proof cover with metal plate when brazing the gas pipes as shown in Fig. 6.4. Pay attention to the flame from the burner not to burn the stop valve body. (3) Connect the indoor unit and the outdoor unit with refrigerant piping.
Page 45 INSTALLATION & OPERATION ● Manifold Pipe (Optional parts) Applicable Outdoor Unit Item Operation Type Model Remarks Outdoor Unit Outdoor Unit kBtu/h Number 190 to 232 HFQ-M202F 3 Pipes Type Manifold * for High Pressure Gas:1set 250 to 340 HFQ-M212F Pipe Heat Recovery Type * for Low Pressure Gas: 1set * for Liquid: 1set...
Page 46 INSTALLATION & OPERATION ● Branch Pipe (Optional Parts) < Line Branch > First Branch Pipe Diameter and Branch Pipe after First Branch Outdoor Unit (kBtu/h) Model High 76 to 96 HFQ-M282F Pressure Pressure Liquid Total Indoor Unit Model 114 to 154 HFQ-M452F (kBtu/h) (fmm)
Page 47 INSTALLATION & OPERATION ● Piping Size ( Upstream Side Pipe Diameter for Outdoor Unit Main Pipe Diameter Outdoor Outdoor Outdoor (Base Unit or Manifold Pipe 1 to First Branch) Unit Unit Unit [Branch pipe of First Branch] (3 Pipes) (*2) (*6) (*6) High...
Page 48 INSTALLATION & OPERATION ● Piping Work Conditions (Refer to the figure of previous page.) Allowable Piping Length (*13) < the recommended > the recommended Item Mark connectable number connectable number of Indoor Unit of Indoor Unit Total Liquid Piping Total Piping Length <...
Page 49 INSTALLATION & OPERATION ● Piping Branch Restriction Follow the table below when performing the field-supplied piping work. Piping Length between Main Piping Branch * Indoor Unit Branch Pipe (First Branch) Capacity Ratio Piping Length Number of Main and Each Indoor Unit (L2) After Main Branch After Branch Piping Branch...
Page 50: Electrical Wiring
INSTALLATION & OPERATION 7. Electrical Wiring ● Turn OFF the main power switch to the indoor unit and the outdoor unit and wait for more than 3 minutes before electrical wiring work or a periodical check is performed. ● Check to ensure that the indoor fan and the outdoor fan have stopped before electrical wiring work or a periodical check is performed.
Page 51: General Check
INSTALLATION & OPERATION General Check (1) Make sure that the field-selected electrical components (main power switches, circuit breakers, wires, conduit connectors and wire terminals) have been properly selected according to the electrical data indicated in Table 7.1. • Supply electrical power to each outdoor unit. An ELB, fuse and main switch should be used for each outdoor unit.
Page 52: Electrical Wiring Connection
INSTALLATION & OPERATION Electrical Wiring Connection The ELB (earth leakage breaker), FUSE and S (main switch) must be installed to the each power source of outdoor unit. If not, it may cause of electrical shock or fire. NOTE: Supply the power source of outdoor units and indoor units respectively. (1) Power Source Wiring Supply the power sources to the each outdoor unit respectively.
Page 53 INSTALLATION & OPERATION (2) The recommended wiring, ELB, breaker size are shown as follow Field Minimum Wire Sizes for Power Source Maximum Power Source Transmitting Earth Wire Nominal Outdoor Unit Running Cable Size Cable Size Nominal Fuse Power Supply Size((mm Sensitive (kBtu/h) Current...
Page 54 INSTALLATION & OPERATION NOTES: 1) Follow local codes and regulations when selecting field wires. 2) The wire sizes marked with *1 in the table of previous page are selected at the maximum current of the unit according to the European Standard, EN60 335-1. Use the wires which are not lighter than the ordinary tough rubber sheathed flexible cord (code designation H05RN-F) or ordinary polychloroprene sheathed flexible cord (code designation H05RN-F).
Page 55: Electrical Wiring For Outdoor Unit
INSTALLATION & OPERATION Electrical Wiring for Outdoor Unit Connect the electrical wirings according to the following figure. (1) Connect the power supply wires to L1, L2, L3, and N (for 380-415V) for the three phase power source on the terminal board TB1 and earth wire to the terminal in the electrical control box. (2) Connect the transmission wires between the outdoor and indoor units to the TB2 terminals 1 and 2 on the PCB1.
Page 56 INSTALLATION & OPERATION Pay attention to the followings to run through the cables under the unit using conduit tube. (The pipe cover is required to remove before performing piping and wiring works.) NOTES: 1. Do not lead the power supply wiring and transmission wiring through the same conduit tube. Moreover, keep at least 5cm between the power supply wiring and transmission wiring.
Page 57: Electrical Wiring Connection Of Indoor Unit, Outdoor Unit And Switch Box
INSTALLATION & OPERATION Electrical Wiring Connection of Indoor Unit, Outdoor Unit and Switch Box Connect a power supply wiring to each outdoor unit. Connect an ELB, fuse and main switch (S) to each outdoor unit. (2) Connect a power supply wiring to each indoor unit group to be connected to the same outdoor unit. (Max.
Page 58 INSTALLATION & OPERATION < 380-415V/50Hz, 380V/60Hz > Outdoor Unit A (Main) Outdoor Unit B (Sub) L1 L2 L3 N 1 2 3 4 L1 L2 L3 N Earth Earth Main Switch TB : Terminal Board PCB : Printed Circuit Board FUSE : Field Wiring : Transmission Line (Shielded Twist Pair Cable)
Page 59 INSTALLATION & OPERATION < 380-415V/50Hz, 380V/60Hz > Outdoor Unit A (Main) Outdoor Unit B (Sub) L1 L2 L3 N 2 3 4 L1 L2 L3 N TB : Terminal Board PCB : Printed Circuit Board : Field Wiring Earth Earth : Transmission Line (Shielded Twist Pair Cable) Main Switch DC5V (Non-Pole Transmission H-LINK System)
Page 60: Dip Switch Setting Of Outdoor Unit
INSTALLATION & OPERATION Dip Switch Setting of Outdoor Unit TURN OFF all power sources before setting. Without turning OFF, the switches do not work and the contents of the setting are invalid. (However, DSW4-No.1, 2, 4 can be operated during power source is ON.) The mark of “...
Page 61 INSTALLATION & OPERATION ● Setting for Transmitting It is required to set the outdoor unit Nos., refrigerant cycle Nos. and end terminal resistance for this Hi- NET system. ● Setting of Outdoor Unit No. In case of the combination of base unit, set DSW6 as shown below. Combination of Base Unit Base Unit Unit A...
Page 62 INSTALLATION & OPERATION • Function Setting External Input/Output and Function Setting Press PSW1 once. Start of Setting Menu Mode Turn ON DSW4-No.4. Arrangement of Dip Switch Setting Press PSW1 for 3 seconds or more. “Menu Mode” will be indicated. For more details, Check Mode refer to “Checking of PSW2...
Page 63: Additional Refrigerant Charge
INSTALLATION & OPERATION 8. Additional Refrigerant Charge Air-Tight Test (1) Check to ensure that the stop valves are closed completely before air-tight test. < Tightening Check of Stop Valves > a) After connecting the pipe, remove the cap of stop valve for high pressure gas, low pressure gas (heat recovery system only) and liquid gas.
Page 64 INSTALLATION & OPERATION (4) Check for any gas leakage at the flare nut connections, or brazed parts by gas leakage tester or by use of a foaming agent or gas leak detector. Recommended Forming Agent Manufacturer Guproflex Yokogawa & CO.,Ltd (5) Insulate high pressure and low pressure (heat recovery system only) gas piping side and liquid piping side.
Page 65: Vacuuming
INSTALLATION & OPERATION Vacuuming (1) Connect a manifold gauge and vacuum pump to the check joints*. High Pressure Gas Stop Valve Heat Pump System Liquid Stop Valve High Pressure Gas Stop Valve Heat Recovery System Low Pressure Gas Stop Valve Liquid Stop Valve (2) Continue vacuum pumping work until the pressure reaches -0.1MPa (-756mmHg) or lower for one to two hours.
Page 66: Additional Refrigerant Charge Calculation
INSTALLATION & OPERATION Additional Refrigerant Charge Calculation Table 8.1 Additional Refrigerant Charge Calculation Although refrigerant has been charged into this unit, additional refrigerant charge is required according to piping length. Determine the additional refrigerant quantity according to the following procedure, and charge it into the system. Record the additional refrigerant quantity to facilitate maintenance and servicing activities thereafter.
Page 67: Charging Work
INSTALLATION & OPERATION Charging Work After vacuum pumping work, check that the high pressure gas valve, low pressure gas valve (low pressure gas valve is for heat recovery system only) and liquid stop valve are fully closed. Charge the additional refrigerant (refer to Table 8.1) from the check joint of liquid stop valve (Charging Refrigerant Amount Tolerance: 0.5kg).
Page 68: Automatic Simple Judgement System For Refrigerant Amount
INSTALLATION & OPERATION Automatic Simple Judgement System for Refrigerant Amount NOTE 1. This function is applicable when outdoor air temperature is 0 to 43 C DB and indoor air temperature is 10 to 32 C DB. 2. For 190 to 510kBtu/h, the operation and 7-segment indication check should be performed at outdoor unit A (main).
Page 69 INSTALLATION & OPERATION ● Special Attention Regarding Refrigerant Gas Leakage Pay attention to the critical gas concentration to avoid accidental refrigerant gas leakage before installing air conditioning systems. Totally Charged Refrigerant Quantity in System (kg) < Critical Concentration (kg/m Room Space for each Indoor Unit (m 0.3 kg/m * In case of KHK S 0010, this value should be decided according to the each country’s regulation such as ISO5149 and EN378.
Page 70: Test Run
INSTALLATION & OPERATION 9. Test Run Test run should be performed according to the Item 9.2. And use the Table 9.1 for recording test run. Do not operate the system until all the check points have been cleared. ● As for the test run of indoor unit, check “Installation & Maintenance Manual” attached to the indoor unit and Switch Box.
Page 71 INSTALLATION & OPERATION Caution for Insulation Resistance If total unit insulation resistance is lower than 1 megohm, the compressor insulation resistance may be low due to retained refrigerant in the compressor. This may occur if the unit has not been used for long periods.
Page 72: Test Run
INSTALLATION & OPERATION Test Run (1) Check to ensure that the stop valves of the outdoor unit are fully opened (low pressure gas: heat recovery system only), and then start the system. (In case of the combination of base units, check that the stop valves of all the connected outdoor units are fully opened.) (2) Perform the test run of indoor units one by one sequentially and then check accordance of the refrigerant piping system and electrical wiring system.
Page 73 INSTALLATION & OPERATION d) Depress “AUTO LOUVER” switch and check that the louver is activated normally without abnormal sound. Depress “AUTO LOUVER” again so that the louver will stop. If abnormal sound is heard, remove the panel and adjust the fitting condition of connection parts in the panel corner cover. Ensure that the panel is mounted correctly to the unit body, otherwise the panel may be deformed.
Page 74 INSTALLATION & OPERATION Table 9.1 Test Run and Maintenance Record MODEL: SERIAL. No. COMPRESSOR MFG. No. CUSTOMER'S NAME AND ADDRESS: DATE: 1. Is the rotation direction of the indoor fan correct? 2. Is the rotation direction of the outdoor fan correct? 3.
Page 75 INSTALLATION & OPERATION Table 9.2 Alarm Code Code Category Content of Abnormality Leading Cause Activation of Float Switch (High Water Level in Drain Pan, Indoor Unit Activation of Protection Device (Float Switch) Abnormality of Drain Pipe, Float Switch or Drain Pan) Activation of Protection Device Activation of PSH (Pipe Clogging, Excessive Outdoor Unit...
Page 76 INSTALLATION & OPERATION Code Category Content of Abnormality Leading Cause Incorrect Capacity Code Setting of Combination Incorrect Capacity Setting of Outdoor Unit and Excessive or Insufﬁcient Indoor Unit Total Indoor Unit Capacity Code System Incorrect Setting of Indoor Unit No. Duplication of Indoor Unit No.
Page 77: Safety And Control Device Setting
INSTALLATION & OPERATION 10. Safety and Control Device Setting • Compressor Protection The compressor is protected by the following devices and their combinations. (1) High Pressure Switch: This switch cuts out the operation of the compressor when the discharge pressure exceeds the setting. (2) Oil Heater: This band type heater protects against oil foaming during cold starting, as it is energized while the compressor is stopped.
Page 78: Common
INSTALLATION & OPERATION 11. Common 11.1 Caution of Outdoor Unit Installation (1) Consideration to Seasonal Wind Avoid the installation that the air intake side (Rear) of the unit is faced directly against a seasonal strong wind. Correct Correct Incorrect Windbreak Fence Seasonal Wind Seasonal Wind Air Intake...
Page 79 INSTALLATION & OPERATION (4) Dimensions of the Hood (Field-Supplied) • Following figures show the recommended dimensions of air discharge hood and air intake hood for the outdoor unit. • Apply steel plate of thickness 1mm for hood part, and of thickness 1.6mm for flange part and stay part. • Apply steel plate with holes for hood part of air intake hood. • Apply munsell code 1.0Y 8.5/0.5 beige color for painting the hood •...
Page 80 INSTALLATION & OPERATION AVWT-136~170FE(7)(9)SS (Cabinet: W1210mm) Unit: mm Front Side Right Side 1158 Air Flow Direction Air Flow Direction (Front Side) (Rear Side) Outdoor Unit 1210 Outdoor Unit Rear Side (View from P) Part Name Air Discharge Hood Rear Suction Hood Left Suction Hood Right Suction Hood Safety Wire Rope (to prevent overturning)
Page 81 INSTALLATION & OPERATION < Enlarged View of A, B and C > Enlarged View of A Enlarged View of B 2-Fixing Screw 2-Fixing Screw 2-Fixing Screw 2-Fixing Screw 2-Fixing Screw 2-Fixing Screw Enlarged View of Enlarged View of C Punch Mark (4 places) Drill a pilot hole into the punch mark and mount the fixing plate.
Page 82 INSTALLATION & OPERATION < Air Discharge and Rear Suction Hood for AVWT-76~114FESR > Unit: mm • Air Discharge Hood Fixing Screw (Accessory) 2 x φ8 2 x φ8 (Hole for fixing screw to (Hole for fixing screw to Prevent overturning) Prevent overturning) Fixing Screw Fixing Screw <935>...
Page 83 INSTALLATION & OPERATION < Air Discharge and Rear Suction Hood for AVWT-136~170FESS > Unit: mm • Air Discharge Hood 1158 Fixing Screw (Accessory) 2 x φ8 2 x φ8 (Hole for fixing screw to (Hole for fixing screw to Prevent overturning) Prevent overturning) Fixing Screw Fixing Screw <1194>...
Page 84 INSTALLATION & OPERATION < Left and Right Suction Hood for AVWT-76~170> Unit: mm • Left Suction Hood Fixing Hole Enlarged View of A Fixing Hole φ15 Enlarged View of B <605> Quantity Part Name Left Suction Hood Right Suction Hood Right Plate Left Plate Front Panel (1) Front Panel (2)
Page 85: Refrigerant Piping Provision
INSTALLATION & OPERATION 11.2 Refrigerant Piping Provision < Suspension of Refrigerant Piping > Use the specified non-flammable refrigerant (R410A) to the outdoor unit in the refrigerant cycle. Do not charge material 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.
Page 86: For Heat Pump System
INSTALLATION & OPERATION 11.3 Distribution Method by Branch Pipe (Optional Parts) ■ Applicable Outdoor Units ■ Before Installation These multiple manifold pipes can be applied to Confirm the number of the following parts by the R series. referring to the model printed on the package before unpacking. ■...
Page 87 INSTALLATION & OPERATION ■ Installation Position (Horizontal Installation) Locate the branch pipes on the same horizontal plane. (Inclination within +15 Make the straight length a minimum of 500mm after the vertical bend. Incorrect installation may lead to a failure of outdoor unit. Upward Straight Length Inclination...
Page 88 INSTALLATION & OPERATION ■ Piping Connection (3) Make sure that all stop valves of the outdoor (1) Use clean copper pipes without any moisture unit are closed completely. or foreign materials on inner surface of pipes. When connecting refrigerant pipe, cut (4) Blow the inside of the pipes with nitrogen the copper pipes with a pipe cutter as shown gas when brazing.
Page 89 INSTALLATION & OPERATION < Line Branch (Models: HFQ-102F, HFQ-162F, HFQ-242F, HFQ-302F > [ Installation Work ] ■ Piping Connection Size Piping shall be supported with adequate space. The ends of the branch pipes are finished as Bent pipes and bypass piping (horizontal loop) shown in the following figures. Cut the end of shall also be installed in order to absorb piping the pipe to meet with the pipe size.
Page 90 INSTALLATION & OPERATION ■ Installation Position (1) Horizontal Installation Locate the branch pipes on the same horizontal plane. (Inclination within 30 Make the straight length a minimum of 0.5m after the vertical bend. Upward Straight Length Inclination within +30 500mm (Min.) Inclination Downward Horizontally...
Page 91 INSTALLATION & OPERATION ■ Piping Connection (3) Make sure that all stop valves of the outdoor (1) Use clean copper pipes without any moisture unit are closed completely. or foreign materials on inner surface of pipes. When connecting refrigerant pipe, cut (4) Blow the inside of the pipes with nitrogen the copper pipes with a pipe cutter as shown gas when brazing.
Page 92: For Heat Recovery System
INSTALLATION & OPERATION 11.3.2 For Heat Recovery System < Manifold Pipe (Models: HFQ-M202F, HFQ-M212F, HFQ-M302F) > [ Installation Work ] ■ Piping Connection Size Piping shall be supported with adequate space. The ends of the branch pipes are finished as Bent pipes and bypass piping (horizontal loop) shown in the following figures. Cut the end of shall also be installed in order to absorb piping the pipe to meet with the pipe size.
Page 93 INSTALLATION & OPERATION ■ Installation Position (Horizontal Installation) Locate the branch pipes on the same horizontal plane. (Inclination within +15 Make the straight length a minimum of 500mm after the vertical bend. Incorrect installation may lead to a failure of outdoor unit. Upward Straight Length Inclination...
Page 94 INSTALLATION & OPERATION ■ Piping Connection (3) Make sure that all stop valves of the outdoor (1) Use clean copper pipes without any moisture unit are closed completely. or foreign materials on inner surface of pipes. When connecting refrigerant pipe, cut (4) Blow the inside of the pipes with nitrogen the copper pipes with a pipe cutter as shown gas when brazing.
Page 95 INSTALLATION & OPERATION < Line Branch (Models: HFQ-M142F, HFQ-M282F, HFQ-M452F, HFQ-M562F, HFQ-M692F, HFQ-M902F > [ Installation Work ] ■ Piping Connection Size Piping shall be supported with adequate space. The ends of the branch pipes are finished as Bent pipes and bypass piping (horizontal loop) shown in the following figures. Cut the end of shall also be installed in order to absorb piping the pipe to meet with the pipe size.
Page 96 INSTALLATION & OPERATION ■ Installation Position (1) Horizontal Installation Locate the branch pipes on the same horizontal plane. (Inclination within 30 Make the straight length a minimum of 0.5m after the vertical bend. Upward Straight Length Inclination within +30 500mm (Min.) Inclination Downward Horizontally...
Page 97 INSTALLATION & OPERATION ■ Piping Connection (3) Make sure that all stop valves of the outdoor (1) Use clean copper pipes without any moisture unit are closed completely. or foreign materials on inner surface of pipes. When connecting refrigerant pipe, cut (4) Blow the inside of the pipes with nitrogen the copper pipes with a pipe cutter as shown gas when brazing.
Page 98: Switch Box (Optional Parts)
INSTALLATION & OPERATION 11.4 Switch Box (Optional Parts) 11.4.1 Safety Summary Do not perform installation work, refrigerant Do not install the Switch Box and cable ● within approximately 3 meters from strong piping work and electrical wiring connection electromagnetic wave radiators such as without referring to our installation manual.
Page 99: Switch Box Installation
INSTALLATION & OPERATION 11.4.4 Switch Box Installation Factory-Supplied Accessories ■ Check to ensure that the following accessories are packed with the Switch Box. Do not install the Switch Box in a flammable ● environment to avoid fire or an explosion. NOTE If any of these accessories are not packed with the unit, please contact your contractor. Check to ensure that the ceiling slab is strong ●...
Page 100 INSTALLATION & OPERATION Initial Check ■ • Check to ensure that the ceiling is sufficiently • Install the Switch Box with a proper clearance strong to sustain the Switch Box. If the ceiling is around it for maintenance working space, as weak, abnormal sound and vibration may occur. shown in the below figure. • The refrigerant flow sound may be heard from Unit: mm the Switch Box when the electric expansion valve in the Switch Box is activated.
Page 101 INSTALLATION & OPERATION Suspension Bolts ■ Step 1 Unit: mm (1) Select a final location and installation direction of the Switch Box paying careful attention to the space for the piping, wiring (For Suspension Bolt) Suspension Bracket and maintenance. 2-11 x 34 Slotted Hole (2) Mount suspension bolts after selecting the final location of the Switch Box.
Page 102 INSTALLATION & OPERATION Installation ■ < Changing the Location of Electrical Box > Depending on the installation space, changing the location of electrical box is available. In case of changing the location of electrical box, follow the procedure below. (1) Remove the service cover for the electrical box. (2) Remove the service cover for the electronic expansion valve.
Page 103 INSTALLATION & OPERATION Marking of the Positions of the Suspension Bolts (2) Hanging the Switch Box ■ and Wiring Connections (a) Hang the Switch Box by putting hands on (1) Mark the positions of the suspension bolts, the bottom of the cabinet. refrigerant piping connections and wiring (b) Insert the suspension bolt into the connection.
Page 104: Refrigerant Piping Work
INSTALLATION & OPERATION 11.4.5 Refrigerant Piping Work ● Flaring Dimension Perform the flaring work as shown below. Use the specified non-flammable refrigerant (mm) (R410A) to the outdoor unit in the refrigerant cycle. Do not charge material other than Diameter -0.4 (fd) φA R410A into the unit such as hydrocarbon R410A refrigerants (propane or etc.), oxygen, 6.35 flammable gases (acetylene or etc.) or 9.53...
Page 105 INSTALLATION & OPERATION ● Cautions for Piping Connection Work (a) Connect the indoor/outdoor connecting pipes. Fix the pipes and pay attention not to contact with weak materials such as ceiling. (Otherwise, abnormal sound may be heard due to the vibration of the piping.) (b) Apply refrigerant oil slightly on the sheet surface of the pipe and flare nut before the flaring work. And then tighten the flare nut with the specified tightening torque using two...
Page 106 INSTALLATION & OPERATION Refrigerant Piping Work ■ Provide the refrigerant pipe in the field. Make sure that the refrigerant pipe should be connected to the same refrigerant cycle unit. (1) Position of Piping Connection Service Cover for Electronic Expansion Valve Electrical Box Gas Pipe Connection (Available for (φA Flare Nut) Both Sides) Low Pressure...
Page 107 INSTALLATION & OPERATION (3) Piping Connection Perform the piping connection according to “Refrigerant Piping” in Item 11.4.5. Connected Indoor Unit Capacity HCH-160D (kBtu/h) Field Flaring Work Low Pressure Gas Pipe 7 to 14 (Field-Supplied) (φ15.88) SW Unit (Upper Surface) Gas Pipe High Pressure Gas Pipe (Field-Supplied) (Field-Supplied) (φ12.7)
Page 108 INSTALLATION & OPERATION (4) Piping Insulation Insulation Clamp (ID38) Insulation Insulation (ID38) SW Unit (ID16) (Upper Surface) HCH-160D Insulation Clamp Insulation (ID16) (ID38) Insulation (ID43) Clamp Insulation Insulation (ID22) (ID43) SW Unit HCH-280D (Upper Surface) Insulation Insulation Clamp (ID20) Insulation (ID22) (ID43) NOTE:...
Page 109: Electrical Wiring
INSTALLATION & OPERATION 11.4.6 Electrical Wiring Turn off the main power switch to the Switch Box, the indoor unit and the outdoor unit before ● electrical wiring work or a periodical check is performed. Protect the wires, drain pipe, electrical parts, etc. from rats or other small animals. If not protected, ●...
Page 110 INSTALLATION & OPERATION Electrical Wiring Connection ■ The electrical wiring connection for the Switch Box is shown in the below figure. (1) Turn OFF the main power switch and take off the electrical box cover of Switch Box. (2) Connect the power supply and earth wires to the terminals in the electrical box. (3) Connect the wires of the operating line to the terminals in the electrical box.
Page 111 INSTALLATION & OPERATION • Example of Electrical Wiring The following figure shows the example of electrical wiring around the Switch Box. Refer to the item 7.4 regarding the electrical wiring of the whole system. Outdoor Unit Connect the operating line for Outdoor Unit the outdoor unit to the terminal Power Supply “1” and “2” of TB2 on the Switch Box. AC1φ...
Page 112: Test Run
INSTALLATION & OPERATION 11.4.7 Test Run NOTICE Refrigerant piping and connecting wires should be connected to the same refrigerant cycle system. If they are connected to the dissimilar refrigerant cycle systems, a malfunction may occur. Special Attention Regarding Refrigerant Gas Leakage ●...
Page 113 INSTALLATION & OPERATION 11.5 Hi-NET System Hi-NET is the wiring system that multiple refrigerant cycles link together with transmission wires connecting indoor units and outdoor units. There is no limitation on the connecting order of the units and the number of wiring branch. (It is essential to ensure that all units are connected.) This Hi-NET system facilitates wiring design and field wiring work, and also it helps total cost reduce.
Page 114 TROUBLESHOOTING Troubleshooting...
Page 115 TROUBLESHOOTING - CONTENTS - 1. Initial Troubleshooting ..........................2-3 Checking of Electrical Wiring and Power Source ................2-3 Checking of Rotary Switch and Dip Switch Setting ............... 2-8 Checking by 7-Segment Display ....................2-11 Function Setting ..........................2-12 Checking of Alarm Code History ....................2-14 Emergency Operation ........................
Page 116: Initial Troubleshooting
TROUBLESHOOTING 1. Initial Troubleshooting Checking of Electrical Wiring and Power Source Inspect the following items when abnormality is found during the system activation. Check Item Check Method Is power source breaker or fuse Check the voltage (secondary side) of the breaker and also blown out? check the conductivity of fuse by a tester.
Page 117 TROUBLESHOOTING Example for Electrical Wiring Connection (Heat Pump System) < 380-415V/50Hz, 380V/60Hz > Outdoor Unit A (Main) Outdoor Unit B (Sub) L1 L2 L3 N L1 L2 L3 N Earth Earth Main Switch TB : Terminal Board PCB : Printed Circuit Board FUSE : Field Wiring : T ransmission Line (Shielded Twist Pair Cable)
Page 118 TROUBLESHOOTING Example for Electrical Wiring Connection (Heat Recovery System) < 380-415V/50Hz, 380V/60Hz > Outdoor Unit A (Main) Outdoor Unit B (Sub) L1 L2 L3 N L1 L2 L3 N 1 2 3 4 TB : Terminal Board PCB : Printed Circuit Board : Field Wiring Earth Earth...
Page 119 TROUBLESHOOTING Table 1.1 Electrical Data and Recommended Wiring, Breaker Size/1 Outdoor Unit Maximum Power Nominal Running Fuse Nominal Supply Line Model Power Supply Sensitive Current Current Current (fmm) (mA) AVWT-76FE(7)SR 16.1 MLFC 2.0SQ AVWT-96FE(7)SR MLFC 3.5SQ MLFC 5.5SQ AVWT-114FE(7)SR 380-415V/50Hz 380V/60Hz MLFC 5.5SQ AVWT-136FE(7)SS...
Page 120 TROUBLESHOOTING NOTES: 1) Follow local codes and regulations when selecting field wires. 2) The wire sizes marked with *1 in the table of previous page are selected at the maximum current of the unit according to the European Standard, EN60 335-1. Use the wires which are not lighter than the ordinary tough rubber sheathed flexible cord (code designation H05RN-F) or ordinary polychloroprene sheathed flexible cord (code designation H05RN-F).
Page 121: Checking Of Rotary Switch And Dip Switch Setting
TROUBLESHOOTING Checking of Rotary Switch and Dip Switch Setting The following figures indicate the normal setting (before shipment) of DSW on PCB in the indoor and outdoor unit. When simultaneous operation control of multiple units or room thermo control is operated, DSW setting will be different with the following figures.
Page 122 TROUBLESHOOTING (2) Indoor Unit (before shipment) Mark of “ ” indicates the position of dip switches. ■ a. Unit No. Setting (RSW1 & DSW6) < Except for AVS Models > Setting is required. Set the unit No. of all indoor units respectively and serially by following setting position shown in the table below.
Page 123 TROUBLESHOOTING c. Refrigerant Cycle No. Setting (RSW2 & DSW5) < Except for AVS Models > Setting is required. Setting positions before shipment are all OFF. Refrigerant Cycle No. Setting DSW5 (Tens Digit) RSW2 (Units Digit) Ex.) Set at No.5 Cycle DSW5 Set by inserting Setting...
Page 124: Checking By 7-Segment Display
TROUBLESHOOTING Checking by 7-Segment Display • Simple Checking by 7-Segment Display / Turn on All Indoor Units / All the Indoor Units Connected to the Outdoor Unit Turn on the Outdoor Unit Auto-addressing Starts During auto-addressing, the following items can be checked using the outdoor unit's on-board 7-segment LED display.
Page 125: Function Setting
TROUBLESHOOTING Function Setting 7-Segment Display Setting Item Contents SEG2 SEG1 No setting Circular at Heating Function Thermo-off Indoor fan forced ON and OFF (2 min. ON / 6 min. OFF) No Setting Night-Shift Setting of night-shift No setting For heating Cancellation of Outdoor Ambient Temperature Limit For cooling...
Page 126 TROUBLESHOOTING 7-Segment Display Setting Item Contents SEG2 SEG1 Initial setting (300~650PK) 2000 pulse Indoor Expansion Valve 1400 pulse Initial Opening of Thermo-ON 1000 pulse Indoor Unit in Heating Mode 600 pulse 05~09 Not prepared (If set, the setting item will be ignored by the control PCB.) Initial setting Cooling operation initial opening -2% Fine Adjustment of...
Page 127: Checking Of Alarm Code History
TROUBLESHOOTING Checking of 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. PSW1 PSW2(▲) History is displayed up to 15 cases at the maximum in alarm occurrence order.
Page 128 TROUBLESHOOTING (1) Register of Alarm Code History Cause of Indication of Alarm Code History Stoppage Alarm Code Alarm Code (Alarm Code Contents Time Alarm or Stoppage or Stoppage O.U. Comp. Fan No. Code Code) Unit No. ○ ○ Activation of protection device Accumulated Time Abnormality transmitting between indoor units and outdoor units Accumulated Time...
Page 129 TROUBLESHOOTING Cause of Indication of Alarm Code History Stoppage Alarm Code Alarm Code (Alarm Code Contents Time Alarm or Stoppage or Stoppage O.U. Comp. Fan No. Code Code) Unit No. ○ Accumulated Time Abnormality of low compression ratio ○ d1-11 Accumulated Time ○...
Page 130 TROUBLESHOOTING (2) Deletion of Alarm Code History Press PSW1 and PSW3 for 5 seconds to clear the alarm code history while the history data is displayed. (All history can be deleted.) PSW2(▲) In order to delete all the history, press PSW1 and PSW3 ( ) PSW3( ) for 5 seconds PSW5( )
Page 131: Emergency Operation
TROUBLESHOOTING Emergency Operation (1) Emergency Mode Operation from Remote Control Switch (AVWT-190FESZ to AVWT-510FESZ Only) If compressor is failed, emergency operation mode is available by the remote control switch. Even if the compressor is failed, the air conditioning operation is continuously available until the troubleshooting is performed.
Page 132 TROUBLESHOOTING (2) Emergency Mode Operation from Outdoor Unit PCB for Inverter Compressor Failure (AVWT-136FESS to AVWT-170FESS Only) This operation is an emergency operation by the constant speed compressor when the inverter compressor is failed. <Alarms Corresponding to Inverter Compressor Failure> 04: Abnormality Transmitting between inverter PCB and Outdoor Unit PCB 06: Abnormality of Inverter Voltage 23: Abnormality of Discharge Gas Thermistor...
Page 133 TROUBLESHOOTING (3) Emergency Mode Operation from Outdoor Unit PCB for Constant Speed Compressor Failure (AVWT-136FESS to AVWT-170FESS Only) This operation is an emergency operation by the other compressor when the constant speed compressor is failed. <Alarms Corresponding to Constant Speed Compressor Failure> 23: Abnormality of Discharge Gas Thermistor 39: Abnormality of Running Current at Constant Speed Compressor (a) Procedure...
Page 134 TROUBLESHOOTING (4) Emergency Mode Operation from Outdoor Unit PCB for Compressor Failure (AVWT-190FESZ to AVWT-510FESZ Only) Turn DSW5-No.1 or No.2 ON to stop the compressor operation. If set, all the compressors in the failed outdoor unit will NOT be operated. Set control PCB1 in the failed outdoor unit.
Page 135: Failure Of Power Supply To Indoor Unit And Remote Control Switch
TROUBLESHOOTING Failure of Power Supply to Indoor Unit and Remote Control Switch Lights and LCD are not Indicated. ● Not Operated ● If fuses are melted or a breaker is activated, investigate the cause of over current and take necessary action. Action Phenomenon Cause...
Page 136: Abnormal Transmission Between Remote Control Switch And Indoor Unit
TROUBLESHOOTING (1.7 Failure of Power Supply to Indoor Unit and Remote Control Switch) Check it by Replace remote Failure of Remote Control Switch self-checking mode *1). control switch if failed. Unconnected Wires Correctly connect Check connectors. to PCB wires. Failure of PCB Check it by Failure of PCB Replace PCB if failed.
Page 137: Abnormalities Of Devices
TROUBLESHOOTING Abnormalities of Devices In the case that no abnormality (Alarm Code) is indicated on the remote control switch, and normal operation is not available, take necessary action according to the procedures mentioned below. Action Phenomenon Cause Check Item (Turn OFF Main Switch) Disconnected Measure coil Coil...
Page 138 TROUBLESHOOTING (1.9 Abnormalities of Devices) Action Phenomenon Cause Check Item (Turn OFF Main Switch) Check Setting Condition of "Thermistor of Remote Control Switch" by Optional Setting * Setting and Control "00": Control by Indoor Thermistor for Suction Air In case that "01": Control by Incorrect Optional thermistor of remote...
Page 139 TROUBLESHOOTING (1.9 Abnormalities of Devices) Action Phenomenon Cause Check Item (Turn OFF Main Switch) Failure of Failure of Thermistor Replace or correctly Discharge Check thermistor by connect wiring when Air Temp. self-checking *2). Disconnected it is abnormal. Thermistor Wire of Thermistor Failure of Remote Indoor Fan...
Page 140 TROUBLESHOOTING (1.9 Abnormalities of Devices) Action Phenomenon Cause Check Item (Turn OFF Main Switch) Indoor Heat Load is Greater Calculate heat load. Use a bigger unit. than Cooling Capacity Gas Leakage Correctly charge or Shortage Measure superheat. refrigerant after of Refrigerant repairing gas leakage.
Page 141 TROUBLESHOOTING (1.9 Abnormalities of Devices) Action Phenomenon Cause Check Item (Turn OFF Main Switch) Check Clogging of Outdoor Unit Remove clogging. Heat Exchanger. Obstacles at inlet or Insufficient outlet of outdoor unit Remove obstacles. Air Flow to heat exchanger? Outdoor Unit Heat Is service space for Secure service space.
Page 142 TROUBLESHOOTING (1.9 Abnormalities of Devices) Action Phenomenon Cause Check Item (Turn OFF Main Switch) Indoor Heat Load is Greater Replace the unit with Calculate heat load. than Heating Capacity a bigger unit. Gas Leakage Correctly charge or Insufficient refrigerant after gas Measure superheat.
Page 143 TROUBLESHOOTING (1.9 Abnormalities of Devices) Action Phenomenon Cause Check Item (Turn OFF Main Switch) Check for filter clogging. Remove clogging. Insufficient Air Flow to Check for any obstacles Indoor Unit at inlet or outlet of Remove obstacles. Heat indoor unit. Exchanger Check indoor fan speed.
Page 144 TROUBLESHOOTING (1.9 Abnormalities of Devices) Action Phenomenon Cause Check Item (Turn OFF Main Switch) Foreign Particles Inside Remove foreign Check it by viewing. of Fan Casing particles. Indoor Unit Fan Runner Adjust position of Check it by viewing. is Hitting Casing fan runner.
Page 145: Troubleshooting Procedure
TROUBLESHOOTING Troubleshooting Procedure Alarm Code Indication of Remote Control Switch ● Indoor Unit Alarm Code Model Code Connected No. Alarm Code Number of Indoor Units COOL COOL ADDS. RN Indicated for a second ABNML ABNML alternately Alarm Code Table Code Category Content of Abnormality Leading Cause...
Page 146 TROUBLESHOOTING Code Category Content of Abnormality Leading Cause Incorrect Capacity Code Setting of Combination Incorrect Capacity Setting of Outdoor Unit and Indoor Unit Capacity Code System Incorrect Setting of Indoor Unit No. Duplication of Indoor Unit No. in same Ref. Gr. Incorrect of Indoor Unit CombinationI ndoor Unit is Designed for R22 Failure of Protection Detecting Device...
Page 147: Troubleshooting By Alarm Code
TROUBLESHOOTING Troubleshooting by Alarm Code Alarm Activation of Protection Device in Indoor Unit Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 148 TROUBLESHOOTING Alarm Activation of Protection Device in Outdoor Unit Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 149 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF Main Switch) Clogging of Heat Remove clogging. Exchanger? Check for dust on Remove dust. air filter. Insufficient Air Flow to Heat Exchanger Check for any obstacles (Outdoor Heat Exchanger at inlet or outlet of Remove obstacles.
Page 150 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF Main Switch) Check for clogging. Remove clogging. Check connecting Replace connector. wiring and connectors. Faulty or Malfunction of Check operating sound Replace coil. Expansion Valve from coil. Check discharge gas Replace thermistor. thermistor.
Page 151 TROUBLESHOOTING Heat Pump System Alarm Abnormal Transmitting between Indoor Units and Outdoor Units Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, or ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 152 TROUBLESHOOTING PCB1: Control PCB in Outdoor Unit PCB: Indoor Unit PCB Is DSW10-1P (Terminating Resistance) Set it correctly. on PCB1 ON? Is the voltage Check the fuses of Is LED1 (red) between faston terminal outdoor unit power on PCB1 ON? "R1"...
Page 153 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF Main Switch) Measure voltage by Power Failure or No Power Supply Supply power. tester. Check for breakage Remove short circuit Short Circuit between Wires of insulation. and replace fuse. Short Circuited Wire Measure insulation Remove short circuit to Melted Fuse for...
Page 154 TROUBLESHOOTING Heat Recovery System Alarm Abnormal Transmitting between Indoor Units and Outdoor Units Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, or ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 155 TROUBLESHOOTING PCB1: Control PCB in Outdoor Unit PCB: Indoor Unit PCB PCB(1): Switch box PCB Is DSW10-1P (Terminating Resistance) Set it correctly. on PCB1 ON? Is the voltage Check the fuses of Is LED1 (red) on between faston terminal outdoor unit power "R1"...
Page 156 TROUBLESHOOTING Is PCB setting Set it correctly. Non-pole operating. Is LED3 (yellow) Is LED3 (yellow) ON even if #1 and #2 Faulty PCB. on PCB ON? on TB2 is removed? Check other indoor units. Is LED3 (yellow) on Check wiring between PCB flashing more than switch box and indoor units Indoor...
Page 157 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF Main Switch) Measure voltage Power Failure or No Power Supply Supply power. by tester. Short Circuit between Check for breakage Remove short circuit Wires of insulation. and replace fuse. Short Circuited Wire Measure insulation Remove short circuit to Melted Fuse for...
Page 158 TROUBLESHOOTING Alarm Abnormal Transmitting between Inverter PCB and Outdoor PCB Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 159 TROUBLESHOOTING Alarm Abnormal Transmitting between Fan Controller and Outdoor PCB Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 160 TROUBLESHOOTING Alarm Abnormality Power Source Phase Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 161 TROUBLESHOOTING Alarm Abnormal Inverter Voltage Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the alarm code is indicated on the display of the outdoor unit PCB1. PCB1: Control PCB in Outdoor Unit ★...
Page 162 TROUBLESHOOTING Alarm Abnormal Fan Controller Voltage Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the alarm code is indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when voltage between terminal “R” and “S” of Fan Controller is insufficient and its occurrence is three times in 30 minutes.
Page 163 TROUBLESHOOTING Alarm Decrease in Discharge Gas Superheat Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 164 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF Main Switch) Ref. Cycle is Different from Check ref. cycle and Repair wiring. the Electrical System the electrical system. Correctly charge Overcharged Refrigerant Check pressures. refrigerant. Check expansion valve. Replace expansion valve Faulty Expansion Valve if faulty.
Page 165 TROUBLESHOOTING Alarm Increase in Discharge Gas Temperature at the Top of Compressor Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 166 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF Main Switch) Ref. Cycle is Different from Check ref. cycle and Repair wiring. the Electrical System the electrical system. Correctly charge Undercharge of Refrigerant Check pressures. refrigerant. Check expansion valve. Replace expansion valve Faulty Expansion Valve if faulty.
Page 167 TROUBLESHOOTING Alarm Abnormality Transmitting between Outdoor Units Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. PCB1: Control PCB in Outdoor Unit O.U.: Outdoor Unit...
Page 168 TROUBLESHOOTING Alarm Incorrect Outdoor Unit Address Setting Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. PCB1: Control PCB in Outdoor Unit O.U.: Outdoor Unit...
Page 169 TROUBLESHOOTING Abnormality of Thermistor for Indoor Unit Inlet Air Temperature Alarm (Air Inlet Thermistor) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 170 TROUBLESHOOTING Abnormality of Thermistor for Indoor Unit Discharge Air Temperature Alarm Code (Air Outlet Thermistor) “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 171 TROUBLESHOOTING Abnormality of Thermistor for Indoor Unit Heat Exchanger Liquid Alarm Code Refrigerant Pipe Temperature (Freeze Protection Thermistor) “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 172 TROUBLESHOOTING Abnormality of Thermistor for Indoor Unit Heat Exchanger Alarm Code Gas Refrigerant Pipe Temperature (Gas Piping Thermistor) “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★...
Page 173 TROUBLESHOOTING Activation of Protection Device for Indoor Fan Motor Alarm Code (AVC-Model) “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the alarm code is indicated on the display of the outdoor unit PCB. ★...
Page 174 TROUBLESHOOTING Activation of Protection Device for Indoor Fan Motor Alarm Code (except AVC Model) “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● alarm code is indicated on the display of the outdoor unit PCB1. ★...
Page 175 TROUBLESHOOTING Alarm Abnormality of High Pressure Sensor for Outdoor Unit Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the pressure sensor voltage decreases lower than 0.1V or increases higher than 4.9V during running. PCB1: Control PCB in Outdoor Unit Is the connection CN7 of the outdoor unit Connect correctly. PCB1 abnormal? Is 12 VDC applied across #1 and #3 of the Faulty PCB1. connector CN7 of the outdoor unit PCB1? Is voltage under 0.1 VDC or over 4.9VDC...
Page 176 TROUBLESHOOTING Abnormality of Thermistor for Outdoor Air Temperature Alarm Code (Outdoor Unit Ambient Thermistor) “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the thermistor is short-circuited (less than 0.2 kW) or cut (greater than 500 kW) during running. PCB1: Control PCB in Outdoor Unit Outdoor Unit Is it connected to Ambient Thermistor Connect it. THM7 (Ta) of PCB1? (THM7) Is resistance of THM7 between 0.2kΩ and Faulty Thermistor 500kΩ? Refer to "Alarm Code 11"...
Page 177 TROUBLESHOOTING Abnormality of Thermistor for Discharge Gas Alarm Code Temperature on the Top of Compressor “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, or ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. If abnormality with the thermistor is found, check all the thermistors as shown below. ★ This alarm is indicated when the thermistor is short-circuited (less than 0.9 kW) or cut (greater than 5,946 kW) during running. PCB1: Control PCB in Outdoor Unit Position of Thermistor Is the setting of DSW2 Set DSW2 on PCB1 THM8 (Td1) THM9 (Td2) on PCB1 right? correctly. for Inverter Drive for Constant Speed Drive Are discharge gas thermistors (THM8, AVWT-76* to AVWT-114* THM9) connected to Connect them. THM8 (TD1) and AVWT-136* to AVWT-170* THM9 (TD2) on PCB1? Characteristics of Thermistor Is resistance of discharge gas thermistors (THM8 and THM9) same Faulty Thermistor. with characteristic in right figure? R25=200kΩ...
Page 178 TROUBLESHOOTING Abnormality of Thermistor for Outdoor Unit Heat Exchanger Liquid Pipe Alarm Code (Te/Tchg) “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. If abnormality with the thermistor is found, check the thermistors as shown below. ★ This alarm is indicated when the thermistor is short-circuited (less than 0.2kW) or cut (greater than 840kW) for 8 minutes during running. If this thermistor is faulty, this alarm is indicated. Are thermistors connected to THM10 (Te) or THM17 (Tchg) Connect it. on PCB1? < Details for Thermistor > Te Thermistor (THM10) Tchg Thermistor (THM17) Is resistance of the thermistor between Faulty Thermistor 0.2kΩ...
Page 179 TROUBLESHOOTING Abnormality of Thermistor for Outdoor Unit Heat Exchanger Gas Pipe Alarm (Tg/Tbg) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. If abnormality with the thermistor is found, check all the thermistors as shown below. ★ This alarm is indicated when the thermistor is short-circuited (less than 0.2kW) or cut (greater than 840kW) for 8 minutes during running. If this thermistor is faulty, this alarm is indicated. Are thermistors connected to Connect it. THM11 (Tg) or THM23 (Tbg) on PCB1? < Details for Thermistor > Tg Thermistor (THM11), Tbg Thermistor (THM23) Is resistance of the thermistor between Faulty Thermistor 0.2kΩ...
Page 180 TROUBLESHOOTING Alarm Abnormality of Low Pressure Sensor for Outdoor Unit Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the pressure sensor voltage decreases lower than 0.1V or increases higher than 4.9V during running. PCB1: Control PCB in Outdoor Unit Is the connection CN8 of the outdoor unit Connect correctly. PCB1 abnormal? Is 12 VDC applied across #1 and #3 of the connector Faulty PCB1 CN8 of the outdoor circuit board PCB1? Is voltage under 0.1 VDC or over 4.9 VDC across...
Page 181 TROUBLESHOOTING Alarm Incorrect Capacity Setting of Indoor Unit and Outdoor Unit Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, ● and the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the capacity setting dip switch, DSW2 on the outdoor unit PCB1, is not set (all the settings from #1 to #6 are OFF) or mis-setting. ★ This alarm is indicated when the total indoor unit capacity is smaller than 50% or greater than 130% of the combined outdoor unit capacity. PCB1: Control PCB in Outdoor Unit PCB: Indoor Unit PCB Are #1-#6 of DSW2 on the outdoor unit PCB1 Set the capacity for PCB1. set incorrectly? Are #1-#4 of DSW3 on the indoor unit PCB set Set the capacity for PCB.
Page 182 TROUBLESHOOTING Alarm Abnormal Transmitting between Outdoor Units Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, ● and the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the following condition occurs after normal transmitting between outdoor unit and outdoor unit is maintained; • Abnormality is maintained for 30 seconds. • Abnormality is maintained for 30 seconds even after micro-computer reset (automatically). PCB1: Control PCB in Outdoor Unit Faulty Is LED1 turned ON on PCB1 Check the power supply Turn ON the power supply. of outdoor unit B and C? of outdoor unit.
Page 183 TROUBLESHOOTING Alarm Incorrect Indoor Unit No. Setting Code “ RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, ● and the alarm code is indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated 5 minutes after power is supplied to the outdoor unit when the indoor unit No. connected to the outdoor unit is duplicated by setting of DSW and RSW. Alarm Incorrect Indoor Unit Combination Code “ RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, ● and the alarm code is indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the indoor unit connected to outdoor unit is designed for refrigerant R22 type. PCB1: Control PCB in Outdoor Unit 2-70...
Page 184 TROUBLESHOOTING Alarm Abnormality of Picking up Circuit for Protection in Outdoor Unit Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and the alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when AC 220V or 240V is not detected in A* during inverter compressor stoppage. PCB1: Control PCB in Outdoor Unit Is AC220V or 240V applied Faulty PCB1 A* during stopping? PCB1 is normal Check wiring connection of other PCB1. *1) Power Supply 380-415V/50Hz Between terminal #3 of PCN2, PCN16 and faston terminal 380V/60Hz “N1” on PCB1 Between terminal #3 of PCN2, PCN16 and faston terminal 220V/60Hz “S1” on O.U. PCB1 Action...
Page 185 TROUBLESHOOTING Alarm Abnormality of Running Current at Constant Speed Compressor Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the following conditions occurs; • The running current of the constant speed compressor exceeds the value of overcurrent limitation during operating. • The running current of the constant speed compressor is detected 0A and retry when 3 minutes are passed after all compressors are stopped, and this phenomenon occurs three times within 30 minutes. PCB1: Control PCB in Outdoor Unit Does the CMC2 Check wiring connection turn ON? around PCB1. Check fuses and wiring Does the constant speed between CMC2 and compressor operate? constant speed compressor.
Page 186 TROUBLESHOOTING Action Phenomenon Cause Check Item (Turn OFF Main Switch) Excessively High or Operate within Low Voltage of 380-415V + 10% Power Source Excessively Large Running Current of Imbalance Among Adjust voltage between Compressor Motor Phase at Power Source each phase. Excessively High Check for causes. Discharge Pressure Melted Fuse for Replace the fuses. Power Source Looseness of Screws Single Phase OperationT ightly fix screws. for Power Source Overcurrent Deterioration of Contact Replace magnetic of Compressor of Magnetic Switch for contactor. Motor Compressor Failure of Compressor Locked-up? Replace compressor.
Page 187 TROUBLESHOOTING Alarm Abnormality of Outdoor Unit Capacity Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, ● and the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the total capacity of outdoor unit connected to O.U.~O.U. transmission terminal exceeds 54HP. PCB1: Control PCB in Outdoor Unit O.U. Outdoor Unit Set the DSW2 of the Has PCB1 of outdoor unit replaced PCB1 correctly. A, B or C been replaced? Is the operating line between Set the DSW6 of the outdoor unit and outdoor unit replaced PCB1 correctly.
Page 188 TROUBLESHOOTING Alarm Abnormality Transmitting between Main Unit and Sub Unit(s) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, ● and the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when transmission to outdoor unit B or C is NOT maintained for 30 seconds. (Alarm code “31” will be indicated when transmission to all the outdoor units connected to O.U.~O.U. transmission terminal is NOT maintained.) PCB1: Control PCB in Outdoor Unit O.U.: Outdoor Unit Faulty Is LED1 turned ON on PCB1 Check the power supply Turn ON the power supply. of outdoor unit B and C? of outdoor unit. Good Is fuse of outdoor unit Inspect the cause and...
Page 189 TROUBLESHOOTING Alarm Activation of Low Compression Ratio Protection Device Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when a compression ratio, ε= {(Pd + 0.1) / (Ps + 0.06)} is calculated from a discharge pressure (Pd MPa) and suction pressure (Ps MPa) and the condition lower than ε < 1.8 occurs more than three times (including three) in one hour. PCB1: Control PCB in Outdoor Unit Does the inverter operate? Check the inverter. Check the compressor and Does the compressor operate? power cable. Is the reversing valve spindle Replace the reversing valve if faulty. mounted at middle position? Are the high-pressure sensor and Replace the high-pressure sensor...
Page 190 TROUBLESHOOTING Alarm Activation of Low Pressure Increase Protection Device Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ In case that compressor is operated under the condition that is higher than 1.4MPa of suction pressure (Ps) for 1 minute, all compressors are stopped and retry operation is started after 3 minutes. However this alarm is indicated when same phenomenon is occurred at two times within the next 30 minutes. PCB1: Control PCB in Outdoor Unit Is there a leak in the Replace the solenoid valve (SVA) solenoid valve (SVA)? if faulty. Is the reversing valve spindle Replace the reversing valve if faulty. mounted at middle position? Replace the low-pressure sensor Is the low-pressure sensor normal?
Page 191 TROUBLESHOOTING Alarm Activation of High Pressure Increase Protection Device Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ In case that compressor is operated under the condition that is higher than 3.8MPa of discharge pressure (Pd) for 1 minute, all compressors are stopped and retry operation is started after 3 minutes. However this alarm is indicated when same phenomenon is occurred at two times within the next 30 minutes. PCB1: Control PCB in Outdoor Unit PCB: Indoor Unit PCB Is there a leakage of the Replace the solenoid valve (SVA) solenoid valves (SVA)? if faulty. Is the outdoor unit stop valve Open the stop valve.
Page 192 TROUBLESHOOTING Activation of Low Pressure Decrease Protection Device Alarm (Vacuum Operation Protection) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when a suction pressure (Ps) is lower than 0.09 MPa for over 12 minutes and its state occurs more than three times PCB1: Control PCB in Outdoor Unit (including three) in one hour. PCB: Indoor Unit PCB Is the amount of refrigerant correctly? Correctly charge refrigerant. Is the outdoor stop valve open? Open the stop valve. Is refrigerant leaking? Repair leaks.
Page 193 TROUBLESHOOTING Alarm Activation of Inverter Overcurrent Protection Device (1) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when inverter electronic thermal protection is activated at six times within 30 minutes. (Retry operation is performed up to the occurrence of five times.) Conditions of Activation: Inverter current with 105% of the rated current runs for 30 seconds continuously. Inverter current runs intermittently and the accumulated time reaches up to 3 minutes, in 10 minutes. PCB1: Control PCB in Outdoor Unit PCB2: Inverter PCB Is the cause of "2" stoppage " " of Refer to next page. troubleshooting by 7-segments display Restart operation. "2" or "4"? "4" Yes (Transistor Module is normal.) Is the compressor current larger than activation current? Is discharge pressure high? Smaller than activation current. Check pressure and refrigeration cycle. Check for clogging of the heat exchanger.
Page 194 TROUBLESHOOTING Alarm Activation of Inverter Overcurrent Protection Device (2) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when instantaneous overcurrent occurs at six times within 30 minutes. (Retry operation is performed up to the occurrence of five times.) Conditions of Activation: Inverter current with 150% of the rated current PCB1: Control PCB in Outdoor Unit PCB2: Inverter PCB Turn OFF power and disconnect U, V, W from Faulty compressor terminals. Restart operation. Check Replace Turn ON #1 of DSW1 on Does it trip soon? inverter PCB *1) inverter PCB.
Page 195 TROUBLESHOOTING Alarm Abnormality of Inverter Current Sensor Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ In case that the abnormality of current transformer (0A detecting) occurs three times within 30 minutes, this alarm is indicated at the third time. (Retry operation is performed up to second time of abnormality occurrence.) Condition of Activation: When the frequency of compressor is maintained at 15 to 18Hz after compressor is started, one of the absolute value of running current detected by the current transformer at each phase U+, U-, V+ and V- is less than 1.5A (including 1.5A). PCB1: Control PCB in Outdoor Unit Restart operation. PCB2: Inverter PCB Faulty PCB2 Compressor stops and replace PCB2. *2) immediately. (nearly 18Hz) How is compressor operation when restarted? Compressor is not operated.
Page 196 TROUBLESHOOTING Alarm Inverter Error Signal Detection Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ IPM (Transistor Module) has detecting function of abnormality. This alarm is indicated when the transistor module detects the abnormality seven times in 30 minutes. (Retry operation is performed up to the occurrence of six times.) Conditions of Activation: Abnormal Current to the Transistor Module such as Short Circuited or Grounded or A bnormal Temperature of the Transistor Module or Control Voltage Decrease PCB1: Control PCB in Outdoor Unit PCB2: Inverter PCB No (It trips after a certain period.) Restart operation. Check the compressor. Does it trip soon? (Itc=21) Is high pressure increased? (It trips immediately.) Check pressure and refrigerant cycle.
Page 197 TROUBLESHOOTING NOTE: When the unit is applied the excessive surge current due to lighting or other causes, this alarm code “53” or the inverter stoppage code (IT) “11” will be indicated and the unit can not be operated. In this case, check to ensure the surge absorber/surge arrester (SA) on the noise filter (NF1). The surge absorber may be damaged if the inner surface of the surge absorber is black. In that case, replace the surge absorber. If the inside of the surge absorber is normal, turn OFF the power once and wait for PCB2’s LED201 (red) OFF (approx. 5 min.) and turn ON again. < Position of Surge Absorber > Surge Absorber (SA) (Surge Arrester) < Position of Surge Absorber > Surge Absorber (SA) (Surge Arrester) Surge Absorber (SA) (Surge Arrester) Surge Absorber (SA) (220V) SP-226-1 OKAYA 250VAC/30A LFB-14930-3MA Surge Absorber (SA) (Surge Arrester) (380-415V) 2-84...
Page 198 TROUBLESHOOTING Alarm Abnormality of Inverter Fin Temperature Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ In case that the abnormality of inverter fin temperature occurs three times within 30 minutes, this alarm is indicated at the third time. (Retry operation is performed up to second time of abnormality occurrence.) Conditions of Activation: This alarm is indicated when the temperature of the inverter fin thermistor for Transistor Module is higher than 90 PCB1: Control PCB in Outdoor Unit PCB2: Inverter PCB Normal Restart operation. Check the thermistor. Replace the PCB2. *1) Does it trip soon? Faulty Replace the thermistor. Is the heat exchanger of Remove clogging.
Page 199 TROUBLESHOOTING Alarm Inverter Failure Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ T his alarm is indicated when the following phenomenon occurs three times in 30 minutes. (Retry operation is performed up to the occurrence of two times.) Actual frequency from PCB2 is less than 10Hz (after inverter frequency output from PCB1). Conditions of Activation: This alarm is indicated when PCB2 is not performed normally. PCB1: Control PCB in Outdoor Unit PCB2: Inverter PCB Turn off power (LED201 OFF) PCB2 is normal. and restart operation. Check the noise filter. *1) Is alarm code “55” indicated again? Replace the PCB2.
Page 200 TROUBLESHOOTING < Position of Surge Absorber > Surge Absorber (SA) (Surge Arrester) Surge Absorber (SA) (220V) SP-226-1 OKAYA 250VAC/30A LFB-14930-3MA Surge Absorber (SA) (Surge Arrester) (380-415V) 2-87...
Page 201 TROUBLESHOOTING Alarm Activation of Fan Controller Protection Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ IPM (Transistor Module) has detecting function of abnormality. This alarm is indicated when the abnormality is detected ten times within 30 minutes. (Retry operation is performed up to the occurrence of nine times.) Conditions of Activation: Abnormal Current to the Transistor Module such as Short Circuited or Grounded or Overcurrent or Control Voltage Decrease PCB1: Control PCB in Outdoor Unit Turn OFF the power supply. Disconnect the faston terminal (U, V, W) Check the fan motor. and turn ON the DSW1-#1 of fan controller. And then restart the operation.
Page 202 TROUBLESHOOTING < Position of Surge Absorber > Surge Absorber (SA) (Surge Arrester) Surge Absorber (SA) (220V) SP-226-1 OKAYA 250VAC/30A LFB-14930-3MA Surge Absorber (SA) (Surge Arrester) (380-415V) 2-89...
Page 203 TROUBLESHOOTING Alarm Abnormality of Fan Controller Fin Temperature Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when the abnormality of fin temperature occurs ten times within 30 minutes. (Retry operation is performed up to the occurrence of nine times.) Conditions of Activation: This alarm is indicated when the thermistor temperature inside the transistor module exceeds 100 PCB1: Control PCB in Outdoor Unit Restart operation. Replace the fan controller. Does it trip soon? Coat the silicon grease to all Is the silicon grease coated all over the touched face between between the transistor module and the the transistor module and the radiated fin?
Page 204 TROUBLESHOOTING Alarm Activation of Fan Controller Overcurrent Protection Device (1) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when fan controller electronic thermal protection is activated at ten times within 30 minutes. (Retry operation is performed up to the occurrence of nine times.) Conditions of Activation: Electric current with 105% of the rated current runs for 30 seconds continuously. Electric current runs intermittently and the accumulated time reaches up to 3 minutes, in 10 minutes. PCB1: Control PCB in Outdoor Unit Is the cause of "2" stoppage " " of troubleshooting by Refer to next page. 7-segments display Restart operation. "2" or "4"? "4" Cause of fan controller overload Yes (Fan controller is normal.) Is the fan controller current larger than activation current? Does the fan stop by the foreign matter? Smaller than activation current. Is fan rotated reversely due to contrary wind? Check for clogging of the heat exchanger.
Page 205 TROUBLESHOOTING Alarm Activation of Fan Controller Overcurrent Protection Device (2) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ This alarm is indicated when instantaneous overcurrent occurs at ten times within 30 minutes. (Retry operation is performed up to the occurrence of nine times.) Conditions of Activation: Fan controller current with 150% of the rated current. PCB1: Control PCB in Outdoor Unit PCB2: Inverter PCB Turn off power and disconnect U, V, W Faulty from fan controller Restart operation. Replace Check terminals. Does it trip soon? fan controller. fan controller *1) Turn ON #1 of DSW1 It trips on PCB2 and restart. Normal immediately. Does it trip? Is there any cause It trips. Check the fan motor. of instantaneous voltage decrease? Check the capacity It trips after a and wiring of the certain period.
Page 206 TROUBLESHOOTING Alarm Abnormality of Fan Controller Sensor Code ★ C onditions of Activation: This alarm is indicated when the following condition occurs. ● After fan motor operation is started, fan controller current does NOT exceed 1.5A. ● Before fan motor operation is started, fan controller peak current does NOT exceed 4A. Restart operation. Faulty fan controller Fan motor stops and replace immediately. fan controller. *1) How is fan motor operation when restarted? Fan motor is not operated. Abnormal Is the fan motor coil Check the fan motor.
Page 207 TROUBLESHOOTING Alarm Incorrect Setting of Unit and Refrigerant Cycle No. Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● alarm code is indicated on the display of the outdoor unit PCB. ★ This alarm is indicated under the following conditions. Turn off the power source and check for DSW and RSW settings. Conditions Action Unit No. (DSW6 and RSW1) or Refrigerant Cycle No. (DSW5 and RSW2) are set above “64”. Set Unit No. and Refrigerant Cycle No. below “63”. Or, more than 2 pins are set at DSW5 and DSW6. Alarm Incorrect Indoor Unit Connection No. Setting Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code is indicated on the display of the outdoor unit PCB1. (“35” is indicated on the display of the remote control switch.) 2-94...
Page 208 TROUBLESHOOTING Alarm Incorrect Indoor Unit Connection (Switch Box) Code “RUN” light flashes and “ALARM” is indicated on the remote control switch. ● The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and ● the unit No. and alarm code are indicated on the display of the outdoor unit PCB1. ★ <Heat Recovery System> This alarm is indicated when two or more Switch Boxes are connected between outdoor unit and indoor unit. PCB1: Control PCB in Outdoor Unit PCB(1): Switch Box PCB Is wiring connection for Switch Box Correctly connect the wiring incorrect? and reset the power supply. Failure of PCB(1) in Switch Box • Alarm Code "C1" will be indicated when the units are connected as follows. Alarm Code "C1" will be indicated in this Switch Box. Outdoor Unit Switch Box Switch Box Switch Box Indoor Unit Indoor Unit Indoor Unit Indoor Unit 2-95...
Page 209 TROUBLESHOOTING Alarm Incorrect Indoor Unit Connection No. Setting (Switch Box) Code The unit No., alarm code (“35”) and the unit code is alternately indicated on the set temperature ● section of indoor unit connected to Switch Box. LED (LED4, 5, 6 ) on PCB(1) in Switch Box flashes. ● ★ <Heat Recovery System> This alarm is indicated when nine or more indoor units are connected to Switch Box. PCB1: Control PCB in Outdoor Unit PCB(1): Switch Box PCB Are 9 or more indoor units Correctly connect the wiring connected to Switch Box? and reset the power supply. Failure of PCB(1) in Switch Box • Alarm Code "C2" will be indicated when the units are connected as follows. Outdoor Unit (Ref. Cycle Group: 1) Switch Box Indoor Unit 1 Indoor Unit 2 Indoor Unit 3 Indoor Unit 9 (Ref. Cycle Group: 1) (Ref. Cycle Group: 1) (Ref. Cycle Group: 1) (Ref. Cycle Group: 1) 2-96...
Page 210 TROUBLESHOOTING Alarm Incorrect Indoor Unit Connection (Switch Box) Code The unit No., alarm code (“35”) and the unit code is alternately indicated on the set temperature ● section of indoor unit connected to Switch Box. LED (LED5, 6) on PCB(1) in Switch Box flashes. ● ★ <Heat Recovery System> This alarm is indicated when indoor unit with different refrigerant cycle group is connected to Switch Box. PCB1: Control PCB in Outdoor Unit PCB(1): Switch Box PCB Is wiring connection for Switch Box Correctly connect the wiring incorrect? and reset the power supply. Set refrigerant cycle group Is the refrigerant cycle group setting (RSW2, DSW5) correctly for indoor unit connected to and reset the power supply. Switch Box incorrect? Failure of PCB(1) in Switch Box • Alarm Code "C3" will be indicated when the units are connected as follows. Outdoor Unit Alarm Code "C3" will be indicated in this Switch Box. (Ref. Cycle Group: 1) Switch Box Switch Box Switch Box Indoor Unit Indoor Unit Indoor Unit Indoor Unit (Ref. Cycle Group: 1) (Ref. Cycle Group: 1) (Ref. Cycle Group: 1)
Page 211: Troubleshooting In Check Mode By Remote Control Switch
TROUBLESHOOTING Troubleshooting in Check Mode by Remote Control Switch Use the remote control CHECK switch in the following cases. (1) When the RUN lamp is flashing. (2) To trace back the cause of trouble after restarting from stoppage with the RUN lamp flashing. (3) To check during normal operation or stoppage.
Page 212 TROUBLESHOOTING Although the wireless remote controller is used for wall type indoor unit with built-in receiver part, the alarm code can be checked by connecting wired controller to the connector of the unit and pressing the operation switch. NOTES: 1. The unit is not operated by pressing operation switch. 2.
Page 213 TROUBLESHOOTING Thermo Temp. of Remote Control Heating Thermo-ON Alarm Cooling Thermo-ON Switch Dark Indication on Micro-Computer Input/Output Micro-Computer Input/Output in 52C1 Indoor Unit 20A1 52C2 Micro-Computer Input/Output in 20CHG 20F1 Outdoor Unit 20F2 Operation OFF, Power OFF Thermo-OFF (NOTE 1), Activating Float Switch Alarm (NOTE 2) Freeze Protection, Overheating Protection Instantaneous Power Failure at Outdoor Unit, Reset...
Page 214 TROUBLESHOOTING Compressor Pressure/Frequency Indication Discharge Pressure (High) (x 0.1 MPa) Suction Pressure (Low) (x 0.01 MPa) Control Information This is an indication for internal information for the remote control switch. This does not have any specific meaning. Operation This is an indication for frequency of Inverter. Frequency (Hz) Indoor Unit Capacity Indication The capacity of the indoor unit is indicated as shown...
Page 215 TROUBLESHOOTING (2) Contents of Check Mode 2 The latest data of the first three indoor units only connected serially are indicated when more than three indoor units are connected to one remote control switch. By pressing the part of “TEMP” switch, the next display is indicated, If the part of “TEMP” switch is pressed, the previous display is indicated. Indication of Category Code Temperature Indication Indication of Temperature, etc.
Page 216 TROUBLESHOOTING Compressor Pressure/Frequency Indication Discharge Pressure (High) (x 0.1 MPa) Suction Pressure (Low) (x 0.01 MPa) Control Information This is an indication for internal information for the remote control switch. This does not have any specific meaning. Operating This is an indication for frequency of inverter. Frequency (Hz) Expansion Opening Indication Indoor Unit...
Page 217: Troubleshooting By 7-Segment Display
TROUBLESHOOTING Troubleshooting by 7-Segment Display Only the authorized person can check with this method. Operating conditions and each part of refrigeration cycle can be checked by 7-segments and push switches on the PCB1 in the outdoor unit. (1) Before Checking (a) Turn ON main power source.
Page 218 TROUBLESHOOTING (3) Protection Control Code on 7-Segment Display * Protection control code is displayed on 7-segment during operation when a protection control is activated. * Protection control code is displayed while function is working, and goes out when released. * When several protection control are activated, code number with higher priority will be indicated (see below for the priority order).
Page 219 TROUBLESHOOTING (4) Activating Condition of Protection Retry Control Code Protection Control or Retry Control is performed to prevent the abnormal operation. The activating conditions are shown in the table below. Code Protection Control Activating Condition Remarks Compression Ratio e>8.5 Pressure Ratio Protection Control Compression Ratio e<2.0 Discharge Pressure...
Page 220 TROUBLESHOOTING (5) Alarm Code Refer to the item 2.1. (6) Checking Method by Checking Mode Menu Press PSW1 for once. To Start Checking Press PSW1 more than (A) Outdoor Combination Unit No. Check Mode 3 seconds. “CHEC” The outdoor combination unit No. is “Menu”...
Page 221 TROUBLESHOOTING (C) Outdoor Unit Information Unit Indication Select the outdoor combination unit No. for indication. When the selection is changed, press PSW4 ( ) to forward or PSW2 ( ) to backward. Unit A (No.0) Select the outdoor combination unit No. for indication by pressing PSW4 or PSW2. Unit B (No.2) Press PSW3 ( ) for details information.
Page 222 TROUBLESHOOTING (D) Indoor Unit Information Unit No. Indication This information is indicated on the unit A (main unit) only. Select the indoor unit number for the information indication. No.0 Press PSW4 ( ) to forward or press PSW2 ( ) for backward. No.1 Select the indoor unit No.
Page 223 TROUBLESHOOTING (F) Alarm Code History Information 7-Segment Display This information is indicated on the unit A (main unit) only. Data No. If history of abnormality exists, it is indicated maximum 15 case in chronological order. SEG2 SEG1 Press PSW4 ( ) to forward or press PSW2 ( ) for backward.
Page 224 TROUBLESHOOTING (7) Running Current of Compressor Inverter Primary Current ● The inverter primary current is estimated from the running current of the compressor MC1 indicated on 7-segment, as chart below. 220V 380-415V Upper Limit Upper Limit Lower Limit Lower Limit Running Current of Compressor MC1 Running Current of Compressor MC1 Indicated on 7- segment...
Page 225: Function Of Rsw, Dsws And Leds
TROUBLESHOOTING Function of RSW, DSWs and LEDs <380-415V/50Hz,380V/60Hz> The Interior of the Electrical Control Box Front Side Front Side (Sub Electrical Control Box, ＡＶＷＴ－１３６～１７０＊ <220V/60Hz> Model: AVWT-86~114* Front Side The Interior of the Electrical Control Box Model: AVWT-136~170* Front Side The Interior of the Electrical Control Box 2-112...
Page 226 TROUBLESHOOTING Purpose ■ Symbol Purpose PCB1 for Control 1. Transmitting between Indoor Unit and Outdoor 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 227 TROUBLESHOOTING < Dip Switch Setting of Outdoor Unit > TURN OFF all power sources before setting. Without turning OFF, the switches do not work and the contents of the setting are invalid. (However, DSW4-No.1, 2, 4 and push switches can be operated during power source is ON.) The mark of “...
Page 228 TROUBLESHOOTING Part Name Contents of Functions Power Source Indication for PCB1 (Low Voltage) LED1 (Red) Normal Condition: Activated Abnormal Condition: Deactivated This LED2 indicates the transmission state between the PCB1 and PCB2. LED2 (Green) Normal Condition: Flashing Abnormal Condition: Activated or Deactivated This LED3 indicates the transmission state between the indoor unit and outdoor unit.
Page 229 TROUBLESHOOTING c. Fan Controller < 380-415V/50Hz, 380V/60Hz > CN206 DCL1 CN207 LED202 (Yellow) DCL2 HIC1 DSW1 (L3) LED501 (Red) < 220V/60Hz > CN206 DCL1 CN207 LED202 (Yellow) DCL2 HIC1 DSW1 (L3) LED501 (Red) Part Name Contents of Functions Power Source Indication for Fan Controller LED501 (Red) Normal Condition: Activated...
Page 230: Procedure Of Checking Each Main Parts
TROUBLESHOOTING 3. Procedure of Checking Each Main Parts Self-Checking of PCBs using Remote Control Switch The following troubleshooting procedure is utilized for function test of PCBs in the indoor unit and outdoor unit. RUN/STOP Press Stop Operation TEMP Simultaneously depress PCB Check Mode CHECK two switches for 3 seconds.
Page 231 TROUBLESHOOTING from previous page In case that there is a second unit. TEMP CHECK <Self-checking Indication of the Next Unit> Press (ex.) Repetition of Self-checking of Unit No. "1". Indication of ADDS. RN Unit No. "2" After 7 Seconds Result After 1 to 5 Seconds After 1 Second Repetition...
Page 232: Self-Checking Of Remote Control Switch
TROUBLESHOOTING Self-Checking of Remote Control Switch Changing of LCD Indication Indicating Only for Turn ON the power source. LCD Indication Period cancellation (sec.) of EEPROM, depress the Simultaneously depress the following following 3 switches. (During 3 switches 1 second operation, they can be depressed.) simultaneously during changing MODE...
Page 233 TROUBLESHOOTING The LCD indication changes as shown below. The detected temperature of remote control thermostat is indicated at the part (A) in the figure below. If the number "- -" or "FF" is indicated at the (A) part, the remote control thermostat is abnormal. In case of depressing the RESET switch or The LCD indication changes as leaving the switches for 15 seconds, the data...
Page 234: Procedure Of Checking Other Main Parts
TROUBLESHOOTING Procedure of Checking Other Main Parts (1) High Voltage Discharge Work for Replacing Parts Perform this high voltage discharge work to avoid an electric shock. < Procedure > (a) Turn OFF the main switches and wait for three minutes. Check to ensure that no high voltage exists.
Page 235 TROUBLESHOOTING Remove all the terminals of the transistor module before check. If items (a) to (d) are performing and the results are satisfactory, the transistor module is normal. Measure it under 1kΩ range of a tester. Do not use a digital tester. (a) By touching the + side of the tester to the P terminal of transistor module and the - side of tester to U, V and W of transistor module, measure the resistance.
Page 236 TROUBLESHOOTING If items (a) to (d) are performing and the results are satisfactory, the diode module is normal. Measure it under 1kΩ range of a tester. Do not use a digital tester. (a) By touching the + side of the tester to the + terminal of diode module and the - side of tester to the ~ terminals (3 NOs.) of the diode module, measure the resistance.
Page 237 TROUBLESHOOTING (6) Checking of Fan Controller (a) Turn OFF the power source switches before this work. Also ensure that LED501 (Red) on the fan controller is turned OFF. If LED501 is ON, electrical shock may occur. (b) Disconnect all the wirings connected to the fan controller. Measure the resistance between terminals using the tester.
Page 238 TROUBLESHOOTING (7) Checking Method of Electronic Expansion Valve Indoor Unit Electronic Expansion Valve Outdoor Unit Electronic Expansion Valve Locked Check for the liquid pipe temperature during It is abnormal if the liquid pipe pressure does with heating operation. not increase during cooling operation Fully Closed It is abnormal if the temperature does not increase.
Page 239 TROUBLESHOOTING (8) Checking of Electrical Coil Parts Resistance Name of Parts Electrical Wiring Diagram Wiring No. (Ω) DC Fan Motor U: Red for Outdoor Unit White-Black (AVWT-76 to AVWT-114) 2.58+0.3 Black-Red at 20 Red-White V: White W: Black DC Fan Motor U: Red for Outdoor Unit White-Black...
Page 240 TROUBLESHOOTING (9) 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 TROUBLESHOOTING 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 small by detecting the temperatures even if the actual discharge gas temperature is high.
Page 242: Test Run
TROUBLESHOOTING Test Run Turn OFF all the power source switches. Use a tester and make sure that all the switches are turned OFF. Before test run, check that the unit is appropriately installed according to Installation & Maintenance Manual. After that, inspect the following items. Check Item Contents Damage...
Page 243: Test Run By Remote Control Switch
TROUBLESHOOTING Test Run by Remote Control Switch (1) Turn ON the power source of the indoor and outdoor units. (2) Set the TEST RUN mode by the remote control switch. Counting Number of Connected Units epress the "MODE" and the "CHECK" switches HIGH SET TEMP.
Page 244: Test Run From Outdoor Unit Side
TROUBLESHOOTING Test Run from Outdoor Unit Side The procedure of test run from the outdoor unit side is indicated below. Setting of this dip switch is available with the power source ON. Setting of Dip Switch (Before Shipment) DSW4 Switch for Setting of Service Operation and Function 1.
Page 245 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 to operate immediately and the indoor unit is under the condition of Thermo- OFF.
Page 246: Checking At Test Run
TROUBLESHOOTING Checking at Test Run (1) Indoor and Outdoor Fan Inspect that the indoor fan and outdoor fan rotate correctly and the air flow is smooth. (2) Power Supply Voltage < Voltage Change > Check the power supply. If the power supply is abnormal, contact with electric Initial Voltage power company. Operating Voltage Usually, voltage drop will occur when starting as shown in the figure (V In order to protect device, comply with the following Starting Voltage...
Page 247: Checking List For Refrigerant Cycle
TROUBLESHOOTING Checking List for Refrigerant Cycle CHECK LIST ON TEST OPERATION CLIENT: INSTALLER: DATE: O.U. MODEL: O.U. SERIAL NO.: CHECKER: I.U. Model I.U. Serial No. I.U.: Indoor Unit, O.U.: Outdoor Unit Piping Length: Additional Refrigerant Charge: (1) General Check Item Result <Combination of Base Units>...
Page 248 TROUBLESHOOTING (3) Check Item after Sampling Data a. Cooling Operation (It is applicable when outdoor temperature is higher than 15°C.) Check Item Standard Causes Result 1 Is fan actually running when • Fan Motor Failure Fo (Air Flow Rate of O.U. Fan) is not “0”? •...
Page 249 TROUBLESHOOTING Heating Operation (It is applicable when outdoor temperature is higher than 0°C.) Check Item Standard Causes Result 1 Are oE1 and oE2 (O.U. Ex. Valves Opening) • Excessive abnormally low or high when TdSH is 15 Refrigerant to 45 deg.? •...
Page 250: Reset For Accumulated Operation Time Of Compressor 1-2 After Maintenance (Cuj1-Cuj2)
TROUBLESHOOTING Reset for Accumulated Operation Time of Compressor 1-2 after Maintenance (cUJ1-cUJ2) <Procedure> Press PSW1 and PSW3 for 5 seconds while the accumulated operation time of compressor data is displayed. <Example of Compressor 1> “cUJ1” (Accumulated Operation Time of Compressor 1) will be indicated. PSW2 PSW3 Press PSW1 and PSW3 for 5 seconds while the accumulated operation time is...

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