Hisense Hi-FLEXi S Series Technical, Installation, Maintenance
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Hisense Hi-FLEXi S Series Technical, Installation, Maintenance

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Qingdao Hisense Hitachi Air-conditioning Systems Co.,Ltd.
Add.: No. 218, Qianwangang Road, Economic and Technological Development Zone, Qingdao, China
http://www.hisensehvac.com E-mail: export@hisensehitachi.com
Specifications in this catalogue are subject to change without notice, in order that Hisense may
bring the latest innovations to their customers.
TCY12020008D
VRF AIR-CONDITIONER
「HEAT RECOVERY」
Technical, Installation
and Service Handbook
Hi-FLEXi S
SERIES (208V)
BASIC MODELS
AVWT-72FFFH
AVWT-96FFFH
AVWT-120FFFH
AVWT-144FFFH
AVWT-168FFFH
AVWT-192FFFH
COMBINATION MODELS
AVWT-216~ 456FFFH
TCY12020008D
Date: April. 2023

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Summary of Contents for Hisense Hi-FLEXi S Series

  • Page 1 AVWT-216~ 456FFFH Add.: No. 218, Qianwangang Road, Economic and Technological Development Zone, Qingdao, China http://www.hisensehvac.com E-mail: export@hisensehitachi.com Specifications in this catalogue are subject to change without notice, in order that Hisense may bring the latest innovations to their customers. TCY12020008D TCY12020008D Date: April.
  • Page 3 ● If you have any questions, contact your dealer or designated service center of HISENSE. ● To prevent the environment, please do not discard the product at will, and HISENSE can provide recycling services in accordance with the relevant provisions of the country and provide replaceable parts in accordance with national standard requirements.
  • Page 4 ● 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. In case of a fire, cut off the power at the first time; do not touch the electrical parts by hand to avoid electric shock hazard.
  • Page 5 The standard utilization of the unit shall be explained in these instructions. Please contact your local agent, as the occasion arises. ● HISENSE’s liability shall not cover defects arising from the alteration performed by a customer without HISENSE’s consent in a written form.

  • Page 6: Table Of Contents

    CONTENT DESIGN Introduction Models of Outdoor Unit Application Case Combination General Data General Data Component Data Safety and Control Device Setting Sound Data Dimensional Data Structure Piping System Connection of Refrigerant Pipes for 3 Pipes Heat Recovery System Connection of Refrigerant Pipes for 2 Pipes Heat Pump System Pipe Connection Design Guidance for 3 Pipes Heat Recovery System Pipe Connection Design Guidance for 2 Pipes Heat Pump System Calculation of Additional Refrigerant...
  • Page 7 Electrical Wiring Connection DIP Switch Setting of Outdoor Unit Additional Refrigerant Charge Air-Tight Test Vacuuming Charging Operation Test Run Before Test Run Test Run SERVICE Troubleshooting Initial Troubleshooting 1.1.1 Checking of Electrical Wiring and Power Supply 1.1.2 Checking of Rotary Switch and Dip Switch Setting 1.1.3 Checking by 7-Segment Display 1.1.4...
  • Page 8 2.18.1 Removing Service Cover for Electrical Box and Electronic Expansion Valve 2.18.2 Removing Electrical Components 2.18.3 Removing Electric Expansion Valve Coil Main Parts Inverter 3.1.1 Specifications of Inverter 3.1.2 Arrangement of Inverter Power Unit 3.1.3 Overload Protection Control Electronic Expansion Valve Pressure Sensor Noise Filter (NF1, NF2) Reactor (DCL1,DCL2) Optional Function...

  • Page 10: Introduction

    Introduction 1. Introduction 1.1 Models of Outdoor Unit 【Basic Unit】 Capacity 72(6RT) 96(8RT) 120(10RT) 144(12RT) 168(14RT) kBtu/h(RT) Model AVWT-72FFFH AVWT-96FFFH AVWT-120FFFH AVWT-144FFFH AVWT-168FFFH Capacity 192(16RT) kBtu/h(RT) Model AVWT-192FFFH Model 72~96 Model 120 Model 144~168 Model 192 【Combination Module】※ Capacity 216(18RT) 240(20RT) 264(22RT) 288(24RT)
  • Page 11 Introduction Model 216 Model 240 Model 264 Model 288~336 Model 360 Model 384 Model 408 Model 432~456...

  • Page 12: Application Case

    Introduction 1.2 Application Case Application Case 1: Three Pipes Heat Recovery System with Switch Box. Capacity Ratio High /Low pressure gas pipe Total Capacity Ratio 50%~150% Low pressure gas pipe Liquid pipe Total 50%~150% Without SW Indoor Unit 0%~50% Box(CoolingOnly) Water Module 0%~60% NOTE：...
  • Page 13 Introduction Application Case 3: Two Pipes Heat Pump System. High /Low pressure gas pipe Total Capacity Ratio 50%~150% Liquid pipe Indoor Unit 50%~150% Water Module 0%~60% NOTE: (1) The function setting of “H4” must be set to 2 on the outdoor unit PCB.

  • Page 14: Combination

    Introduction 1.3 Combination Utilizing an inverter control, a wide range of operation capacity control is also available. A maximum total combination capacity of 150% and a minimum total combination capacity of 50% can be chosen by combination of the indoor units when compared with the nominal outdoor unit capacity.

  • Page 15: General Data

    General Data 2. General Data 2.1 General Data Capacity(RT) Outdoor Model AVWT-72FFFH AVWT-96FFFH AVWT-120FFFH AVWT-144FFFH Model Conbination AVWT-72FFFH AVWT-96FFFH AVWT-120FFFH AVWT-144FFFH Power Supply 208/230V 3PH 60Hz Btu/h 69000 92000 114000 138000 Nominal Cooling Capacity Cooling 20.2 27.0 33.4 40.4 Power Consumption (Ducted/Non-ducted) 5.69/4.65 7.80/6.55 9.65/8.21...
  • Page 16 General Data Capacity(RT) Outdoor Model AVWT-168FFFH AVWT-192FFFH AVWT-216FFFH AVWT-240FFFH AVWT-168FFFH AVWT-192FFFH AVWT-96FFFH AVWT-120FFFH Model Combination AVWT-120FFFH AVWT-120FFFH Power Supply 208/230V 3PH 60Hz Btu/h 160000 184000 206000 228000 Nominal Cooling Capacity Cooling 46.9 53.9 60.4 66.8 Power Consumption (Ducted/Non-ducted） 14.57/13.52 16.14/15.53 17.45/14.76 19.30/16.42 Operation*1*2...
  • Page 17 General Data Capacity(RT) Outdoor Model AVWT-264FFFH AVWT-288FFFH AVWT-312FFFH AVWT-120FFFH AVWT-144FFFH AVWT-144FFFH Model Combination AVWT-144FFFH AVWT-144FFFH AVWT-168FFFH Power Supply 208/230V 3PH 60Hz Btu/h 252000 275500 298000 Nominal Cooling Capacity 73.8 80.8 87.3 Cooling Operation*1*2 Power Consumption (Ducted/Non-ducted） 22.35/19.59 25.40/22.76 27.27/24.90 EER (Ducted/Non-ducted） (Btu/h)/W 11.26/12.86 10.85/12.11...
  • Page 18 General Data Capacity(RT) Outdoor Model AVWT-336FFFH AVWT-360FFFH AVWT-384FFFH AVWT-168FFFH AVWT-168FFFH AVWT-192FFFH Model Combination AVWT-168FFFH AVWT-192FFFH AVWT-192FFFH Power Supply 208/230V 3PH 60Hz Btu/h 320000 344000 368000 Nominal Cooling Capacity 93.8 100.8 107.8 Cooling Operation*1*2 Power Consumption (Ducted/Non-ducted） 29.14/27.04 30.71/29.05 32.28/31.06 EER (Ducted/Non-ducted） (Btu/h)/W 10.99/11.84 11.19/11.84...
  • Page 19 General Data Capacity(RT) Outdoor Model AVWT-408FFFH AVWT-432FFFH AVWT-456FFFH AVWT-120FFFH AVWT-144FFFH AVWT-144FFFH Model Combination AVWT-144FFFH AVWT-144FFFH AVWT-144FFFH AVWT-144FFFH AVWT-144FFFH AVWT-168FFFH Power Supply 208/230V 3PH 60Hz Btu/h 389500 413500 435500 Nominal Cooling Capacity 114.2 121.2 127.7 Cooling Operation Power Consumption (Ducted/Non-ducted） 35.05/30.97 38.10/34.14 39.97/36.28 EER (Ducted/Non-ducted）...
  • Page 20 General Data High Efficiency and Energy Saving By improving the performance of the compressor and optimizing the refrigerant system, considerable energy savings for buildings will be achieved with the line-up of the heat pump system and the heat recovery system. Integrated Energy Efficiency Ratio (IEER) IEER ((Btu/h)/W) 32.00...

  • Page 21: Component Data

    General Data 2.2 Component Data Outdoor Heat Exchanger, Fan and Fan Motor Model AVWT-72* AVWT-96* AVWT-120* AVWT-144* Heat exchanger type Multi-way cross-flow finned tube type Material Copper Tube Outside diameter in.(mm) 9/32 (7) Rows Heat Material Aluminum Exchanger Pitch in.(mm) 1/16 (1.4) 1/16 (1.4) 1/16 (1.4)
  • Page 22 General Data Parameters of Compressor Compressor Model ANB52FZNMT ANB66FZNMT ANB78FZNMT High Side psi(MPa) 601(4.15) Design Pressure Low Side psi(MPa) 320(2.21) Model Three-phase sync motor Start-up mode Compressor Motor Polarities Insulation grade Brand FVC68D Refrigerator oil Quantity volume Model Compressor Model Compressor Quantity AVWT-72* ANB66FZNMT...

  • Page 23: Safety And Control Device Setting

    General Data 2.3 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.

  • Page 24: Sound Data

    General Data 2.4 Sound Data Measurement point: 3.3ft. (1m) from the service cover surface and 4.9ft.(1.5m) from floor level. AVWT-72FFFH AVWT-96FFFH mode mode Central Frequency (Cycle per Second) Central Frequency (Cycle per Second) AVWT-120FFFH AVWT-144FFFH mode mode Central Frequency (Cycle per Second) Central Frequency (Cycle per Second)
  • Page 25 General Data AVWT-168FFFH AVWT-192FFFH mode mode Central Frequency (Cycle per Second) Central Frequency (Cycle per Second)

  • Page 26: Dimensional Data

    General Data 2.5 Dimensional Data unit: in.(mm) ■ Outdoor Unit Model: AVWT-72*, AVWT-96* 2-43/64(68) 2-43/64(68) 31-31/32(812) Φ Φ Anchor bolt fixing hole Maintenance panel Electrical box Connection of refrigerant gas pipe (low pressure) Connecti on by welding Connection of refrigerant gas pipe (high/low pressure) Connection by welding Connection of refrigerant liquid pipe Connection with flare opening...
  • Page 27 General Data unit: in.(mm) Model：AVWT-120* 1-49/64(45) Drain port (Φ1-1/32(26)x 2) 4-9/64(105) 25-63/64(660) 7-9/16 192 ) 3-15/16 2-43/64(68) 2-43/64(68) 42-21/64(1075) (100) Drain pipe connector (optional) 4-1/16(103) 7-3/4(197) Drain port (Φ1-1/32(26)×2) Drain pipe connector (optional) Anchor bolt fixing hole Maintenance panel Electrical box Connection of refrigerant gas pipe Connection by welding Connection of refrigerant gas pipe...
  • Page 28 General Data unit: in.(mm) Model：AVWT-144*, AVWT-1 68* 4-9/64(105) 5-45/64(145) 8-11/32(212) 30-45/64(780) Drain port (Φ1-1/32(26)×5) 2-43/64(68) 47-29/32(1217) 2-43/64(68) Drain pipe connector (optional) 4×25/32(20)×19/32(15) 10-7/16(265) Anchor bolt fixing hole Maintenance panel Electrical box Connection of refrigerant gas pipe Connection by welding Connection of refrigerant gas pipe Connection by welding Connection of refrigerant liquid pipe Connection with flare opening...
  • Page 29 General Data unit: in.(mm) Model：AVWT-192* 8-31/32(228) 4-11/64(106) 8-15/64(209) 36-17/32(928) 57-41/64(1464) 2-43/64(68) 2-43/64(68) Drain port (Φ1-1/32(26) × 5 ) Drain pipe connector (optional) 4×25/32(20)×19/32(15) Anchor bolt fixing hole 12-13/32(315) Maintenance panel Electrical box Connection of refrigerant gas pipe Connection by welding Connection of refrigerant gas pipe Connection by welding Connection of refrigerant liquid pipe...

  • Page 30: Structure

    General Data 2.6 Structure AVWT-72*, AVWT-96* SN Part Name Part Name Compressor Solenoid valve (SVA) Heat exchanger Solenoid valve (SVC) Strainer Solenoid valve (SVG) Splitter Solenoid valve (SVJ) 4-way reversing valve (21-1) Solenoid valve (SVS) 4-way reversing valve (21-2) Capillary tube (SVA) Electronic expansion valve (EVO) Capillary tube (SVF) Electronic expansion valve (MV5)
  • Page 31 General Data Model：AVWT-120* Part Name Part Name Compressor Solenoid valve (SVA) Heat exchanger Solenoid valve (SVC) Strainer Solenoid valve (SVG) Splitter Solenoid valve (SVJ) Four-way valve (21-1) Solenoid valve (SVS) Four-way valve (21-2) Capillary tube (SVA) Electronic expansion valve (EVO) Capillary tube (SVF) Electronic expansion valve (MV5) Capillary tube (SVG)
  • Page 32 General Data Model：AVWT-144*, AVWT-168* Part Name Part Name Compressor 17 Solenoid valve (SVA) Heat exchanger 18 Solenoid valve (SVC) Strainer 19 Solenoid valve (SVG) Splitter 20 Solenoid valve (SVJ) Four-way valve (21-1) 21 Solenoid valve (SVS) Four-way valve (21-2) 22 Capillary tube (SVA) Electronic expansion valve (EVO) 23 Capillary tube (SVF) Electronic expansion valve (MV5)
  • Page 33 General Data Model: AVWT-192* Part Name Part Name 1 Compressor 17 Solenoid valve (SVA) 2 Heat exchanger 18 Solenoid valve (SVC) 3 Strainer 19 Solenoid valve (SVG) 4 Splitter 20 Solenoid valve (SVJ) 5 Four-way valve (21-1) 21 Solenoid valve (SVS) 6 Four-way valve (21-2) 22 Capillary tube (SVA) 7 Electronic expansion valve (EVO)

  • Page 34: Piping System

    Piping System 3. Piping System 3.1 Connection of Refrigerant Pipes for 3 Pipes Heat Recovery System Outdoor Unit To Indoor Unit Model (kBtu/h) 72 (6RT) 96 (8RT) 120 (10RT) 144 (12RT) 168 (14RT) 192 (16RT) Low Pressure 3/4(19.05) 7/8(22.2) 1-1/8(28.6) 1-1/8(28.6) 1-1/8(28.6) 1-1/8(28.6)
  • Page 35 Piping System Model (kBtu/h) 216 (18RT) 240 (20RT) 264(22RT) 288 (24RT) 312(26RT) Combination of Outdoor Unit A 120 (10RT) 120 (10RT) 144 (12RT) 144 (12RT) 168 (14RT) Basic Unit Outdoor Unit B 96 (8RT) 120 (10RT) 120 (10RT) 144 (12RT) 144 (12RT) Manifold Pipe HFQ-M202F...
  • Page 36 Piping System Indoor unit on the left Outdoor Unit B Outdoor Unit C side Outdoor Unit A To Indoor Units Manifold Pipe 1 Manifold Pipe 2 Indoor unit on the right Outdoor Unit A Outdoor Unit B side Outdoor Unit C Manifold Pipe 1 Manifold Pipe 2 To Indoor Units...

  • Page 37: Connection Of Refrigerant Pipes For 2 Pipes Heat Pump System

    Piping System 3.2 Connection of Refrigerant Pipes for 2 Pipes Heat Pump System Outdoor Unit To Indoor Unit Model (kBtu/h) 72 (6RT) 96 (8RT) 120 (10RT) 144 (12RT) 168 (14RT) 192 (16RT) High/Low 3/4(19.05) 7/8(22.2) 1-1/8(28.6) 1-1/8(28.6) 1-1/8(28.6) 1-1/8(28.6) Piping Size Pressure Gas Φ...
  • Page 38 Piping System Model (kBtu/h) 216 (18RT) 240 (20RT) 264(22RT) 288 (24RT) 312(26RT) Combination Outdoor Unit A 120 (10RT) 120 (10RT) 144 (12RT) 144 (12RT) 168 (14RT) of Basic Unit Outdoor Unit B 96 (8RT) 120 (10RT) 120 (10RT) 144 (12RT) 144 (12RT) Manifold Pipe HFQ-M32F...
  • Page 39 Piping System Indoor unit on the left side Outdoor Unit B Outdoor Unit C Outdoor Unit A To Indoor Units Manifold Pipe 1 Manifold Pipe 2 Indoor unit on the right side Outdoor Unit A Outdoor Unit B Outdoor Unit C Manifold Pipe 1 Manifold Pipe 2 To Indoor Units...

  • Page 40: Pipe Connection Design Guidance For 3 Pipes Heat Recovery System

    Piping System 3.3 Pipe Connection Design Guidance for 3 Pipes Heat Recovery System Outdoor Unit Outdoor Outdoor Unit Unit Manifold Manifold Pipe1 Pipe2 (*) Keep the straight line distance of 19-11/16in. ① (500mm) or more after the manifold pipe ③ First For single branch SW BOX: Branch...
  • Page 41 Piping System ①② Piping between outdoor unit Refer to section 3.1. ③ Main Pipe (Basic Unit or Manifold Pipe 1 to First Branch) Outdoor Unit Capacity Low Pressure Gas High/Low Pressure Gas Φ Liquid First Branch Model (kBtu/h) Φ in.(mm) in.(mm) Φ...
  • Page 42 Piping System ⑥ Pipe after first branch (2 pipes portion) ⑦ Pipe between last branch and indoor unit (2-pipe portion) 4-Way Cassette Type and Mini 4-Way Cassette Type Total Indoor Liquid Branch Unit (kBtu/h) (Φin.(mm)) (Φin.(mm)) Pipe Model Indoor Unit Air pipe Liquid pipe Q <...

  • Page 43: Pipe Connection Design Guidance For 2 Pipes Heat Pump System

    Piping System 3.4 Pipe Connection Design Guidance for 2 Pipes Heat Pump System (*) Keep the straight line distance of 19-11/16in. (500mm) or more after the manifold pipe Permitted Value ≥ Recommended < Recommended Connectable Item Mark Connectable Number Number of Indoor of Indoor Unit and Unit or Water Water Module...
  • Page 44 Piping System ①② Piping between outdoor unit Refer to section 3.2. ③ Main Pipe (Basic Unit or Manifold Pipe 1 to First Branch) Outdoor Unit Branch Gas (Φin.(mm)) Liquid (Φin.(mm)) capacity (kBtu/h) Pipe Model 3/4(19.05) 3/8(9.53) HFQ-102F 7/8(22.2) 3/8(9.53) 120~140 1-1/8(28.6) 1/2(12.7) HFQ-162F...
  • Page 45 Piping System Piping Branch Restrictions In the case that the piping length from the first branch to the farthest indoor unit (L2) is over 131.2ft.(40m), follow the instructions below when performing the field-supplied piping work. Example 1: Installation with Main Piping Branch In the case that piping length from the first branch to the terminal indoor units is within 131.2ft.(40m)-295.3ft.(90m).

  • Page 46: Calculation Of Additional Refrigerant

    Piping System 3.5 Calculation of Additional Refrigerant Table 3.1 Additional Refrigerant Charge Calculation Although refrigerant has been charged into this unit, additional refrigerant charge is required. 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 47 Piping System Maximum Additional Refrigerant Charge Total additional charge must not exceed the maximum additional refrigerant charge indicated in the following table. Accordingly, allowable total piping length may become shorter than maximum value due to the limitation of maximum additional refrigerant amount. Capacity (kBtu/h) 144~168 192~240 288~336 360~384 408~456...

  • Page 48: Piping Connection Kit Dimensions (Optional)

    Piping System 3.6 Piping Connection Kit Dimensions (optional) Reducer for Reducer for Model Gas Line Liquid Line Gas Line Liquid Line OD 1-1/4(31.75) ID 7/ 8( 22.2) ID 3/ 8 ( 9.53) ID 1-1/2(38.1) ID 1-1/8(28.6) ID 1( 25.4) ID 7/ 8( 22.2) ID 5/ 8 ( 15.88) ID 1-1/4 (31.75) ID 1-1/4(31.75)
  • Page 49 Piping System Reducer for Reducer for Liquid Line Gas Line Models Gas Line Liquid Line ID 1-1/8(28.6) ID 7/8(22.2) OD 1-1/4(31.75) Ø 1(25.4) Ø 1-1/4(31.75) ID 3/4(19.05) ID 1(25.4) ID 1-1/4(31.75) ID 7/8(22.2) ID 5/8(15.88) ID 1-1/2(38.1) ID 3/4(19.05) ID 3/8(9.53) ID 1(25.4) ID 3/8(9.53) ID 5/8(15.88)
  • Page 50 Piping System unit: in.(mm), ID: Inner Diameter, OD: Outer Diameter...
  • Page 51 Piping System Reducer for Reducer for Low Pressure High Pressure Reducer for Model Liquid Line Low Pressure High Pressure Gas Line Gas Line Liquid Line Gas Line Gas Line ID 3/8(9.53) ID 1( 25.4) ID 1 (25.4 ) ID 1-1/8 ( 28.6) ID 1-1/8 ( 28.6) ID 1/2(12.7) ID 1-1/8...
  • Page 52 Piping System Reducer for Reducer for High Pressure Low Pressure Reducer for Model Liquid Line High Pressure Low Pressure Liquid Line Gas Line Gas Line Gas Line Gas Line ID 5/8(15.88) ID 5/8(15.88) Ø 1/2(12.7) Ø 1/2(12.7) Ø 3/8(9.53) Ø 1(25.4) ID 1/2(12.7) ID 1/2(12.7) Ø...
  • Page 53 Piping System High Pressure Low Pressure Reducer for High Reducer for Low Reducer for Model Liquid Line Liquid Line Gas Line Gas Line Pressure Gas Line Pressure Gas Line Ø 1- 3/4 Ø 1- 3/4 ID 1-1/8 ID 1-1/8 ( 44.5 ) ( 44.5 ) ( 28.6) ( 28.6)

  • Page 54: Capacities And Selection Data

    Capacities and Selection Data 4. Capacities and Selection Data 4.1 Procedure for Selection of the System This section explains the procedure to select the most suitable outdoor unit , with the values to be taken into account and the necessary steps to be carried out. This procedure allows to select the unit with the best characteristics to provide the greatest level of efficiency and comfort, considering the building layout, the specifications of the indoor units to be installed and the distribution of air and refrigerant flows.

  • Page 55: Selection Parameters

    Capacities and Selection Data 4.1.2 Selection parameters To select the outdoor units, it will be necessary to consult and/or use a series of parameters shown in tables and graphics presented in the different chapters of this handbook. A summarized list is shown below: For cooling and heating capacities: manual of Engineering Data”.

  • Page 56: Check Points For System Installation

    Capacities and Selection Data 4.1.3 Check points for system installation For selecting the unit capacity, perform the system selection with checking the refrigerant concentration at leakage in order not to exceed the maximum permissible concentration. Calculate the heating load at both cooling Calculate heating load for each room.

  • Page 57: Selection Procedure Example

    Capacities and Selection Data Correction factor according to total indoor unit capacity: - Select the correction factor according to manual of Engineering Data. - Correction factor according to piping length: - Select the correction factor according to 4.2 “Capacity Correction Based on Refrigerant Piping Length”. - Correction factor according to defrosting condition (for heating operation): - Select the correction factor according to 4.3 “Correction Factor According to Defrosting Operation”.
  • Page 58 Capacities and Selection Data Piping dimensions: ● Equivalent pipe length between outdoor unit and indoor units: 196.85 ft. (60 m). ● Pipe height: 82.02 ft. (25 m). ● Cooling capacity correction factor depending on the pipe length =0.90. ● Heating capacity correction factor depending on the pipe length =0.95. ●...
  • Page 59 Capacities and Selection Data Defrost factor Due to frost build-up during heating, defrosting is needed so capacity is reduced. Defrost time is affecting overall capacity so capacity correction is necessary. In consideration of the frost or the defrosting operation, the heating capacity is corrected by the equation below. Corrected Heating Capacity = Correction Factor ×...
  • Page 60 Capacities and Selection Data Results: Concept Room 1 Room 2 Room 3 Room 4 Room 5 Room 6 Room 7 Model selected AVD-19* AVD-24* AVD-24* AVD-27* AVD-38* AVD-48* AVD-48* Actual cooling capacity (Btu/h) 14,745 18,683 18,683 21,153 29,336 37,056 37,056 Actual heating capacity (Btu/h) 14,172 17,977...

  • Page 61: Capacity Correction Based On Refrigerant Piping Length

    Capacities and Selection Data 4.2 Capacity Correction Based on Refrigerant Piping Length < Cooling Capacity > Correction factor for cooling capacity according to piping length. The correction factors are shown in the following figure. The cooling capacity should be corrected according to the Equivalent piping length for following formula: CCA=CC×F...
  • Page 62 Capacities and Selection Data <Heating Capacity > Correction factor for cooling capacity according to piping length. The correction factors are shown in the following figure. The heating capacity should be corrected according to the following Equivalent piping length for formula: HCA=HC×F ●...

  • Page 63: Correction Factor According To Defrosting Operation

    Capacities and Selection Data 4.3 Correction Factor According to Defrosting Operation The heating capacity in the preceding paragraph excludes the condition of the frost or the defrosting operation period. In consideration of the frost or the defrosting operation, the heating capacity is corrected by the equation below. Corrected Heating Capacity = Correction Factor ×...

  • Page 64: Control System

    Control System 5. Control System 5.1 Refrigerant Cycle AVWT-72*~96* Refrigerant flow direction(Cooling) Refrigerant flow direction(Heating) Field refrigerant Piping Flare connection Brazing connection Name Name Name Compressor Refrigerant cooler Solenoid valve Oil separator Subcooler Check valve Liquid High pressure switch 21-1 Stop valve High/Low pressure Gas 4-way reversing Presser sensor...
  • Page 65 Control System AVWT-120* Refrigerant flow direction(Cooling) Refrigerant flow direction(Heating) Field refrigerant Piping Flare connection Brazing connection Name Name Name Compressor Refrigerant cooler Solenoid valve Oil separator Subcooler Check valve Liquid High pressure switch 21-1 Stop valve High/Low pressure Gas 4-way reversing Presser sensor valve 21-2...
  • Page 66 Control System AVWT-144~192* Refrigerant flow direction(Cooling) Refrigerant flow direction(Heating) Field refrigerant Piping Flare connection Brazing connection Name Name Name Refrigerant cooler Compressor Solenoid valve Subcooler Oil separator Check valve Liquid High pressure switch Stop valve High/Low pressure Gas 21-1 4-way reversing Presser sensor valve Low pressure Gas...

  • Page 67: Control Logic

    Control System 5.2 Control Logic (1) Cycle Control Summary of Control Cooling Operation* Heating Operation Simultaneous Operation Control Device Purpose of Purpose of Purpose of Contents of Control Contents of Control Contents of Control Control Control Control Inverter Frequency Control is Mainly Cooling: Inverter Frequency Control Inverter Frequency Control...
  • Page 68 Control System (2) Heat Exchanger Mode Control In accordance with the connectable indoor unit operation mode, the outdoor unit heat exchanger is switched as shown in the table below. Heat Exchanger Mode at Cooling: Condenser COND Heat Exchanger Mode at Heating: Evaporator EVAP The Number of Outdoor Unit: 1 (one) Cooling Mode Mainly Cooling Mode...

  • Page 69: Standard Operation Procedure Chart

    Control System 5.3 Standard Operation Procedure Chart AVWT-72*~192* Cooling operation I.U.: Indoor Unit O.U.: Outdoor Unit Auto - louver Only for Indoor Unit with Auto-Louver 0 Reset Start of Transmitting between Power to Power to PCB I.U. and O.U. I.U.: ON in I.U.: ON Start of Transmitting between I.U.
  • Page 70 Control System Cooling operation I.U.: Indoor Unit Start of Auto-Louver Pressing Only for Air Panel AUTO-LOUVER Alternately or Indoor Unit Switch with Auto-Louver Stop of Auto-Louver Pressing RUN/STOP Switch After 3 min. MD Stop 20 sec. For Unit with Drain Pump Power to MIF : OFF RUN/STOP Lamp: OFF, COOL, Set Fan Speed STOP...
  • Page 71 Control System Dry run I.U.: Indoor Unit O.U.: Outdoor Unit Auto - louver Only for Indoor Unit 0 Reset with Auto-Louver Start of Transmitting between Power to PCB I.U. and O.U. Power to in I.U.: ON Start of Transmitting between I.U.: ON I.U.
  • Page 72 Control System Dry run I.U.: Indoor Unit Start of Auto-Louver Pressing Only for Air Panel AUTO-LOUVER Alternately or Indoor Unit Switch with Auto-Louver Stop of Auto-Louver Pressing RUN/STOP Switch After 3 min. MD Stop 20 sec. For Unit with Drain Pump Power to MIF : OFF RUN/STOP Lamp: OFF, COOL, Set Fan Speed &...
  • Page 73 Control System Freeze protection control during the cool run Power Supply Cooling Operation or Dry Operation Is compressor operated for more than *30 min.? * The judging time varies under the condition. Cooling Operation or Dry Operation Pipe Surface Temp. of >...
  • Page 74 Control System Heating operation I.U.: Indoor Unit O.U.: Outdoor Unit Start of Transmitting between Power to Power to PCB I.U. and O.U. Start of I.U.: ON in I.U.: ON Transmitting between I.U. and Remote Control Switch only for Indoor Unit Auto - louver with Auto-Louver 0 Reset...
  • Page 75 Control System Heating operation I.U.: Indoor Unit O.U. Outdoor Unit Start of Auto-Louver Pressing Only for Air Panel Auto-Louver Alternately or Indoor Unit Switch with Auto-Louver Stop of Auto-Louver Pressing RUN/STOP Indoor < 122°F(50 Switch Unit Discharge Indoor Fan Motor MIF : OFF Temp.
  • Page 76 Control System Defrosting operation Heating Small Temperature Difference Heating Operation Time between Outdoor Temperature 40 Minutes or Above and Evaporating Temperature (Te) at Heat Exchanger Defrosting Stop Heating Non-stop Heating :OFF RVR1 : ON RVR2 : OFF Outdoor FAN MOF1 : OFF when defrosting 1 Minute Later Compressor Operating High Frequency...
  • Page 77 Control System Supply air temperature overheat protection Heating Operation Discharge <149 °F(65 Temp. of Indoor Unit > 149 °F(65 Thermo-OFF Is it continuous more than 3 min.? > 60 Discharge Temp. of Indoor Unit < 140°F(60 Is setting temp. lower than inlet air temp. of Indoor Unit? Thermo-ON Thermo ON/OFF Control of Indoor Unit...
  • Page 78 AVWT-72*~120*...
  • Page 79 AVWT-144*~192*...

  • Page 81: Structure

    Structure 1. Structure 1.1 Outdoor Unit & Refrigeration Cycle Regarding structure drawings and refrigerant cycle diagram, please refer to corresponding sections. 1.2 Necessary Tools and Instrument List for Installation The design pressure for this product is 601psi(4.15MPa). To avoid accidental mixing of the different refrigerant or different refrigerant oil, the sizes of the charging connections have been changed.
  • Page 82 Structure ○: Interchangeable with current R22 :■ Only for Refrigerant R410A (not interchangeable with R22) × : Prohibited ●: Only for Refrigerant R407C (not interchangeable with R22) Interchangeability Measuring Instrument and Reason of Non-Interchangeability and Attention with R22 Application Tool ( ★...

  • Page 83: Transportation And Handling

    Transportation and Handling 2. Transportation and Handling 2.1 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 on the label attached to the outdoor unit. Do not hang the unit by the ropes at the wooden pallet.

  • Page 84: Hanging Method

    Transportation and Handling 2.2 Hanging Method When hanging the unit, ensure a balance of the unit, check to ensure safety and lift up smoothly. (1) Do not remove any packing materials. (2) Hang the unit in packaged state with two wire ropes, as shown in Fig.2.1. Wire Rope Angle of wire rope greater than 60°...

  • Page 85: Outdoor Unit Installation

    Outdoor Unit Installation 3. Outdoor Unit Installation 3.1 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, the space of 19-11/16in.(500mm) for the front side and 11-13/16in.(300mm) for the rear side is required.
  • Page 86 Outdoor Unit Installation (3) Walls on 4 Directions NOTE (1) Keep the upper side open to prevent mutual interference of inlet and outlet air of each outdoor unit. (2) The figure dimensions are sufficient spaces around outdoor units for operation and maintenance at typical installing conditions as follows.

  • Page 87: Factory-Supplied Accessories

    Outdoor Unit Installation 3.2 Factory-Supplied Accessories Check to ensure that the following accessories are packed with the outdoor unit. Table 3.1 Factory-Supplied Accessories unit: in.(mm) Accessory Accessory × 1 × 1 × 1 × 1 × 1 × 1 Pipe Pouch Electrical ×1 ×1...

  • Page 88: Foundation

    Outdoor Unit Installation 3.4 Foundation ● Concrete Foundations (1) The height of the foundation should be 5-29/32in.(150mm ) higher than the ground level. (2) Provide a drainage ditch around foundation for smooth drain. unit:in.(mm) Mortar Hole Φ3-15/16(100)×Depth 5-29/32(150) 2-31/64(63) 2-31/64(63) 24-9/16(624) Drainage Width 3-15/16(100)×Depth 25/32(20)

  • Page 89: Drain Water Treatment

    Outdoor Unit Installation (5) When installing the outdoor unit, fix the unit by anchor bolts (field-supplied). unit: in.(mm) Model: 72~96 Model: 120 2-43/64 2-43/64 2-43/64 2-43/64 (68) (68) (68) (68) 31-31/32 42-21/64 (812) (1075) 4×25/32(20)×19/32(15) 4×25/32(20)×19/32( 15) Hole of Anchor Bolt Hole of Anchor Bolt Model: 192 Model: 144-168...
  • Page 90 Outdoor Unit Installation (2) Do not install the unit over the walkways. Condensate water may fall on people. In case of installing the unit in such a place, provide the additional drain pan. (3) When drain piping is necessary for the outdoor unit, use the drain boss set (Optional, DC-01Q) Do not use drain boss and drain pan kit in the cold area.
  • Page 91 Outdoor Unit Installation Model: 192 unit: in.(mm) 8-31/32(228) 4-11/64(106) 8-15/64(209) 36-17/32(928) Drain port (Φ1-1/32(26)×5) Drain pipe connector (optional) Connection of power cable (Φ1-23/32(43.7) via hole) Connection of Refrigerant pipeline Connection of 12-13/32(315) communication cable (8-55/64(225)×4-1/4(108) (Ø55/64(22)×2 via hole) square hole) ●...

  • Page 92: Refrigerant Piping Work

    Refrigerant Piping Work 4. Refrigerant Piping Work ● Use refrigerant R410A in the refrigerant cycle. Do not charge oxygen, acetylene or other flammable and poisonous gases into the refrigerant cycle when performing a leakage test or an air-tight test. These types of gases are extremely dangerous and can cause an explosion.

  • Page 93: Flaring And Joint

    Refrigerant Piping Work ● Piping Thickness and Material Use the pipes as below. unit:in.(mm) R410A Diameter Thickness Material Φ1/4(6.35) 1/32(0.8) O material Φ3/8(9.53) 1/32(0.8) O material Φ1/2(12.7) 1/32(0.8) O material Φ5/8(15.88) 3/64(1.0) O material Φ3/4(19.05) 3/64(1.0) 1/2H material Φ7/8(22.2) 3/64(1.0) 1/2H material Φ1(25.4) 3/64(1.0)

  • Page 94: Caution About Outdoor Unit Installation

    Refrigerant Piping Work 4.3 Caution about Outdoor Unit Installation Outdoor Unit Alignment Taking three-module combination of outdoor unit as an example. Align the outdoor unit from large capacity as A>B>C, and outdoor Unit “A” should be located at the indoor unit side. Outdoor Unit Capacity: A≥B≥C Outdoor Unit Capacity: A≥B≥C Outdoor...
  • Page 95 Refrigerant Piping Work (4) Place the outdoor unit pipe horizontally or with down gradient toward indoor unit side, or refrigerant oil may accumulate in the pipe. Indoor Unit Side Indoor Unit Side Refrigerant oil accumulates in the pipe (5) For servicing, in case that the pipe is placed frontward of the outdoor unit, secure min.19-11/16in.(500mm) between the outdoor unit and the manifold Pipe.

  • Page 96: Piping Connection

    Refrigerant Piping Work 4.4 Piping Connection Perform piping connection for each outdoor unit. NOTE: Ensure that the refrigerant pipes are connected to a unit in the same refrigerant cycle. ● Prepare the refrigerant pipe in the field for the piping work. ●...

  • Page 97: Stop Valve

    Refrigerant Piping Work 4.4.1 Stop Valve <Gas Valve> (1) Make sure that all the stop valves are closed completely; (2) Connect the charging hose to the service port and release gas from the gas pipe; (3) Cut off the end of the closing pipe (Φ1/4in.) and check that no gas exists inside the gas pipe; (4) Remove the stop valve cover;...

  • Page 98: Piping Connection

    Refrigerant Piping Work 4.4.2 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 pipe as shown in Fig.4.2. 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 99 Refrigerant Piping Work Piping Size For Outdoor Unit unit: in.(mm) Model (kBtu/h) High/Low Pressure 3/4(19.05) 7/8(22.2) 1-1/8(28.6) 1-1/8(28.6) 1-1/8(28.6) 1-1/8(28.6) Piping Size (φmm) Liquid 3/8(9.53) 3/8(9.53) 1/2(12.7) 1/2(12.7) 1/2(12.7) 5/8(15.88) NOTE: If you need to change the piping size for connection, please use the accessory pipe. <...

  • Page 100: Electrical Wiring

    Electrical Wiring 5. Electrical Wiring ● Turn OFF the main power switch to the indoor unit and the outdoor unit and wait for more than 10 minutes before electrical wiring 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 101: Electrical Data

    Electrical Wiring 5.2 Electrical Data 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 an electrical shock or a fire. Perform the electrical work according to the regulations of each region and this manual. NOTE: Supply the power source of outdoor units and indoor units respectively.

  • Page 102: Electrical Wiring Connection

    Electrical Wiring Install a multi-pole main switch with a space of 1/8in.(3mm) or more between each phase. NOTES: (1) When the power supply wiring is longer, select the minimum wiring size of which the voltage drop is within 2%. (2) Power supply voltage should be satisfied with the followings: supply voltage: within +10% of rated voltage starting voltage: within -15% of rated voltage operating voltage: within ±10% of rated voltage...
  • Page 103 Electrical Wiring NOTES: (1) Do not lead the power supply wiring and transmission wiring through the same conduit. Moreover, keep a distance of at least 1-31/32(50mm) between the power supply wiring and transmission wiring. (2) Cut cross line at rubber bush and securely attach it to the knock-out hole for cable protection. (3) Attach the guard plate to avoid entrance of rats or other small animals into the unit.
  • Page 104 Electrical Wiring < Heat Pump System & Heat Recovery System Without Switch Box > Outdoor Unit B (Sub) Outdoor Unit A (Main) L1 L2 L3 1 2 3 4 L1 L2 L3 1 2 3 4 Earth Earth Main Switch Fuse Main Switch 208/230V...
  • Page 105 Electrical Wiring For Multi Branch SW BOX Connect communication cable from outdoor unit to the outdoor terminal H-NET Outdoor block(TB2) in Switch Box. 1 2 3 4 Switch Box HCHM-N08XB PCB1 HCHM-N04XB PCB1 PCB2 Indoor Indoor Outdoor Indoor Indoor Indoor Indoor Power Outdoor...

  • Page 106: Dip Switch Setting Of Outdoor Unit

    Electrical Wiring NOTES: ● When multiple indoor units are connected to the same single SW BOX, they are controlled with the same operation mode. ● When multiple indoor units are connected to the same branch of the multi SW BOX, they are controlled with the same operation mode.
  • Page 107 Electrical Wiring ● Setting of Refrigerant Cycle No. In the same refrigerant cycle, set the refrigerant cycle No. for the outdoor units as shown below. NOTE: In the same refrigerant cycle, set the same refrigerant cycle No. for the outdoor unit and the indoor unit. 0~9 Binary System Dip Setting Method for DSW8 Setting Switch tens digit...
  • Page 108 Electrical Wiring ● Function Setting External Input/Output and Function Setting Arrangement of DIP Switch Setting Press PSW1 once. Start of Setting Menu Mode Turn ON DSW4-No.4. Press PSW1 for at least 3 seconds. SEG2 SEG1 “Menu Mode” will be indicated. For more details, Check Mode refer to “Checking of...

  • Page 109: Additional Refrigerant Charge

    Additional Refrigerant Charge 6. Additional Refrigerant Charge 6.1 Air-Tight Test (1) Check to ensure that the stop valves are closed completely before air-tight test. (2) Connect the indoor units and the outdoor unit with field-supplied refrigerant piping. Suspend the refrigerant piping at specified points and prevent the refrigerant piping from touching weak parts of the building such as wall, ceiling, etc..

  • Page 110: Charging Operation

    Additional Refrigerant Charge 6.3 Charging Operation After vacuum pumping, check that the gas and liquid stop valves are completely closed. Charge additional refrigerant (tolerance: 1.1lbs(0.5kg)) from the check joint of liquid stop valve. If the specified refrigerant quantity can not be charged, follow the procedure below. (1) Fully open the stop valve for gas side (In case of heat recovery system, fully open the stop valve for high/low pressure and low pressure gas pipe).

  • Page 111: Test Run

    Test Run 7. Test Run Test run should be performed according to this section. ● Do not operate the system until all the check points have been cleared. As for the test run of indoor unit and water module, check Technical Catalog attached to the indoor unit and water module. 7.1 Before Test Run (1) Check to ensure that the refrigerant piping and transmission between outdoor unit, SW BOX, indoor units or water modules are connected to the same refrigerant cycle.

  • Page 112: Test Run

    Test Run (1) Confirm that field-supplied electrical components (main switch fuse, fuse-free breaker, earth leakage breakers, wires, conduit connectors and wire terminals) have been properly selected according to the electrical data given in the Technical and Installation Hand book of the unit and ensure that the components comply with national and local codes. (2) Use shielded wires (>18AWG(0.75mm²)) for field wiring to protect from electric noise obstacle (total length of shielded wire shall be less than 3230.8ft.(1000m), and size of shielded wire shall comply with local codes).
  • Page 113 SERVICE...

  • Page 114: Troubleshooting

    Troubleshooting 1. Troubleshooting 1.1 Initial Troubleshooting 1.1.1 Checking of Electrical Wiring and Power Supply Check the following items if there is abnormality to the activation of air conditioner. Check Item Check Method Check the voltage (secondary side) of the breaker and also check the Is power supply breaker or fuse blown out? conductivity of fuse by a tester.
  • Page 115 Troubleshooting Outdoor Unit PCB Push Switches Arrangement of Dip Switch Setting PSW2 For Checking PSW5 PSW3 PSW1 Enter Checking Checking PSW4 For Checking Ref. Cycle Setting is DSW1/ DSW8 No. Setting required. Setting Before Shipment DSW1 Tens Digit DSW8 Last Digit No Setting Emergency DSW5...

  • Page 116: Checking By 7-Segment Display

    Troubleshooting 1.1.3 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 117: Checking Of Alarm Code History

    Troubleshooting 1.1.4 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 History is displayed up to 15 cases at the maximum PSW2(▲) in alarm occurrence order.
  • Page 118 Troubleshooting (1) Register of Alarm Code History Indication of Alarm Code History Cause of Alarm Code Stoppage Alarm Code Contents (Alarm Code or Time * Alarm or Stoppage O.U. Comp. Fan No. Stoppage Code) Code Unit No. Activation of protection device Accumulated Time ○...
  • Page 119 Troubleshooting Indication of Alarm Code History Cause of Stoppage Alarm Code Alarm Code Contents (Alarm Code or Time *Alarm or Stoppage O.U. Comp. Fan No. Stoppage Code) Unit No. Code Accumulated Time ○ ○ Activation of inverter overcurrent protection device d1-17 Accumulated Time ○...

  • Page 120: Emergency Operation

    Troubleshooting 1.1.5 Emergency Operation (1) Emergency Mode Operation from Remote Control Switch for Compressor Failure If one compressor is failed, emergency operation mode is available by the remote control switch after excluding the failed compressor. Even if the compressor is failed, the air conditioning operation is continuously available until the troubleshooting is performed.
  • Page 121 Troubleshooting (2) Emergency Mode Operation from Outdoor Unit PCB for Compressor Failure ① For Combination of Outdoor Units This operation is an emergency operation by excluding the failed unit when the inverter compressor fails. <Alarms Corresponding to Inverter Compressor Failure> 06: Abnormality of inverter voltage 23: Abnormality of discharge thermistor 48: Activation of over current protection device...
  • Page 122 Troubleshooting ② For Outdoor Unit without Combination This operation is an emergency operation by excluding the failed inverter compressor. <Alarms Corresponding to Inverter Compressor Failure> 06: Abnormality of inverter voltage 23: Abnormality of discharge thermistor 48: Activation of over current protection device 51: Abnormality of inverter current sensor 53: Inverter error signal detection 54: Abnormality of inverter fin temperature...

  • Page 123: Failure Of Power Supply To Indoor Unit And Remote Control Switch

    Troubleshooting 1.1.6 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 actions. Action Phenomenon Cause...

  • Page 124: Abnormal Transmission Between Remote Control Switch And Indoor Unit

    Troubleshooting (1.1.6 Failure of Power Supply to Indoor Unit and Remote Control Switch) Check it by Replace remote Failure of Remote Control Switch self-checking mode. control switch if it fails. Unconnected Wires Correctly connect Check connectors. to Each PCB wires. Failure of Each PCB Check it by I.U./O.U.

  • Page 125: Abnormalities Of Devices

    Troubleshooting 1.1.8 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 actions according to the procedures mentioned below. Action Phenomenon Cause Check Item (Turn OFF Main Switch) Disconnected Measure coil...
  • Page 126 Troubleshooting (1.1.8 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 127 Troubleshooting (1.1.8 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 . Disconnected it is abnormal. Thermistor Wire of Thermistor Failure of Remote Replace remote control...
  • Page 128 Troubleshooting (1.1.8 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 129 Troubleshooting (1.1.8 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 130 Troubleshooting (1.1.8 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 131 Troubleshooting (1.1.8 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 132 Troubleshooting (1.1.8 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 133: Troubleshooting Procedure

    Troubleshooting 1.2 Troubleshooting Procedure ● Alarm Code Indication of Remote Control Switch Alarm Code Total No. of Indoor Unit in the same Refrigeration Cycle Refrigeration Cycle No. of Indoor as one Abnormality Occurs Unit which Abnormality Occurs Indoor Unit No. which Abnormality Occurs 1.2.1 Alarm Code Table Code...
  • Page 134 Troubleshooting Code Category Content of Abnormality Leading Cause Abnormality of Outdoor Unit Capacity Outdoor Unit Capacity > 54HP Incorrect Setting of Outdoor Unit Models Combination Incorrect Setting of Main and Sub Unit(s) Combination or Outdoor or Voltage Voltage Unit Abnormality Transmission between Main Unit and Sub Incorrect Wiring, Disconnect Wire, Breaking Wire, PCB Failure Unit(s) Activation of Low Compression Ratio Protection...

  • Page 135: Troubleshooting By Alarm Code

    Troubleshooting 1.2.2 Troubleshooting by Alarm Code Alarm Activation of Protection Device (Float Switch) in Indoor Unit Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 136 Troubleshooting Alarm Activation of Protection Device in Outdoor Unit Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 137 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 138 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 139 Troubleshooting Alarm Abnormal Transmitting between Indoor Units/Water Module and Outdoor Units Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD, or the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB.
  • Page 140 Troubleshooting Is voltage between “L1” Is LED1 (red) and and “N” of PCN1 on SW Check SW BOX wiring LED2 (red) on SW BOX PCB 220V? BOX PCB ON? Is the fuse for SW BOX Replace fuse PCB melted? Is LED4 (green) on SW BOX PCB flashing more than once in 10 seconds?
  • Page 141 Troubleshooting Action Phenomenon Cause Check Item (Turn OFF Main Switch) Measure voltage by Power Failure of No Power Supply Supply power. tester. Remove cause of Check for breakage short circuit. Short Circuit between Wires of insulation. Replace fuse and/or I.U./O.U. PCB if faulty. Remove cause of Short Circuited Wire Measure insulation...

  • Page 142: Abnormality Transmitting Between Inverter Pcb And Outdoor Unit Pcb

    Troubleshooting Alarm Abnormal Transmitting between Inverter PCB and Outdoor Unit PCB Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 143 Troubleshooting *1): When the unit is applied with excessive surge current due to lighting or other causes, this alarm code “04” 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, NF2).
  • Page 144 Troubleshooting Alarm Abnormal Transmitting between Inverter PCB and Fan Controller Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.

  • Page 145: Abnormality Of Power Supply Phase

    Troubleshooting Alarm Abnormality Power Supply Phase Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 146 Troubleshooting Alarm Abnormal Inverter Voltage Code (Insufficient Inverter Voltage or Overvoltage) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.

  • Page 147: Decrease In Discharge Gas Superheat

    Troubleshooting Alarm Decrease in Discharge Gas Superheat Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 148 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. Replace expansion valve Check expansion valve. Faulty Expansion Valve if faulty.
  • Page 149 Troubleshooting Alarm Increase in Discharge Gas Temperature at the Top of Compressor Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 150 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 151 Troubleshooting Alarm Abnormal Transmitting between Outdoor Units Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. Connect operating line between outdoor unit A and outdoor unit B Is operating line between outdoor...

  • Page 152: Incorrect Outdoor Unit Address Setting

    Troubleshooting Alarm Incorrect Outdoor Unit Address Setting Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. Is DSW6 setting for Set DSW6 correctly for outdoor unit B, C and D correct?
  • Page 153 Troubleshooting Alarm Abnormality of Thermistor for Indoor Unit Inlet Air Temperature Code (Inlet Air Thermistor) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 154 Troubleshooting Alarm Abnormality of Thermistor for Indoor Unit Outlet Air Temperature Code (Outlet Air Thermistor) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 155 Troubleshooting Alarm Abnormality of Thermistor for Liquid Refrigerant Pipe Temperature Code at Indoor Unit Heat Exchanger (Freeze Protection Thermistor) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 156 Troubleshooting Alarm Abnormality of Thermistor for Gas Refrigerant Pipe Temperature at Indoor Unit Heat Exchanger Code (Gas Pipe Thermistor) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 157 Troubleshooting Alarm Activation of Protection Device for Indoor Fan Motor Code (Indoor Unit with DC Motor ) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 158 Troubleshooting...
  • Page 159 Troubleshooting Alarm Activation of Protection Device for Indoor Fan Motor ( Indoor Unit with AC Motor ) Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.

  • Page 160: Abnormality Of High Pressure Sensor

    Troubleshooting Alarm Abnormality of High Pressure Sensor for Outdoor Unit Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.

  • Page 161: Abnormality Of Thermistor For Outdoor Air

    Troubleshooting Alarm Abnormality of Thermistor for Outdoor Air Temperature Code (Outdoor Unit Ambient Thermistor) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 162 Troubleshooting Alarm Abnormality of Thermistor for Discharge Gas Code Temperature on the Top of Compressor ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 163 Troubleshooting Alarm Abnormality of Thermistor for Outdoor Unit Heat Code Exchanger Liquid Pipe (Te1/Te2/Tchg/Tsc) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 164 Troubleshooting Alarm Abnormality of Thermistor for Outdoor Unit Heat Exchanger Gas Pipe (Tg/Tbg) Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 165 Troubleshooting Alarm Abnormality of Low Pressure Sensor for Outdoor Unit Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.

  • Page 166: Incorrect Indoor Unit No. Setting

    Troubleshooting Alarm Incorrect Capacity Setting of Indoor Unit and Outdoor Unit Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 167 Troubleshooting Alarm Abnormal Transmitting between Outdoor Units Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...

  • Page 168: Incorrect Indoor Unit Combination

    Troubleshooting Alarm Incorrect Indoor Unit No. Setting Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...

  • Page 169: Abnormality Of Picking Up Circuit For Protection In Outdoor Unit

    Troubleshooting Alarm Abnormality of Picking up Circuit for Protection in Outdoor Unit Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.

  • Page 170: Abnormality Of Outdoor Unit Capacity

    Troubleshooting Alarm Abnormality of Outdoor Unit Capacity Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD, or the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 171 Troubleshooting Alarm Abnormality Transmitting between Main Unit and Sub Unit(s) Code ● The RUN indicator (Red) is flashing The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD, or the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 172 Troubleshooting Alarm Activation of Low Compression Ratio Protection Device Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 173 Troubleshooting Alarm Activation of Low Pressure Increase Protection Device Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 174 Troubleshooting Alarm Activation of High Pressure Increase Protection Device Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 175 Troubleshooting Alarm Activation of High Pressure Decrease Protection Device Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 176 Troubleshooting Alarm Activation of Low Pressure Decrease Protection Device Code (Vacuum Operation Protection) ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 177 Troubleshooting Action Phenomenon Cause Check Item (Turn OFF Main Switch) Check charged ref. Repair leakage and Shortage of Ref. volume or check for correctly charge. leakage. Closed Stop Valve Check stop valve. Open stop valve. Abnormal Low or High Check connector Replace pressure Pressure Sensor for O.U.
  • Page 178 Troubleshooting Alarm Activation of Inverter Overcurrent Protection Device (1) Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 179 Troubleshooting Alarm Activation of Inverter Overcurrent Protection Device (2) Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 180 Troubleshooting Alarm Abnormality of Current Sensor Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 181 Troubleshooting Alarm Inverter Error Signal Detection Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 182 Troubleshooting Cause of inverter stoppage Activation of transistor module protection Ground fault detection Out-of-synchronism detection *1): When the unit is applied with excessive surge current due to lighting or other causes, this alarm code “53” 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, NF2).
  • Page 183 Troubleshooting Alarm Abnormality of Inverter Fin Temperature Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 184 Troubleshooting Alarm Inverter Failure Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 185 Troubleshooting Alarm Activation of Fan Controller Protection Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 186 Troubleshooting Alarm Abnormality of Fan Controller Fin Temperature Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 187 Troubleshooting Alarm Activation of Fan Controller Overcurrent Protection Device (1) Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 188 Troubleshooting Alarm Activation of Fan Controller Overcurrent Protection Device (2) Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD.
  • Page 189 Troubleshooting Alarm Abnormality of Fan Controller Sensor Code ★ Conditions of Activation: This alarm code is indicated when the following conditions occur. (1) After fan motor operation is started, fan controller current does NOT exceed 1.5A. (2) Before fan motor operation is started (at completing the phase positioning), the wave height value of running current for the phase positioning is less than 4A.
  • Page 190 Troubleshooting Alarm Abnormality of PCB Cooling Module Temperature Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB. ★...
  • Page 191 Troubleshooting Alarm Incorrect Setting of Unit and Refrigerant Cycle Number Code ● The RUN indicator (Red) is flashing ● The indoor unit number, the alarm code, the unit model code and the number of connected indoor units are displayed on LCD.
  • Page 192 Troubleshooting Alarm Incorrect Indoor Unit Connection (SW BOX) Code ● LED (LED10, 11, 12, 13) on SW BOX PCB flashes. ★ <Heat Recovery System> This alarm code is indicated when two or more SW BOXes are connected between outdoor unit and indoor unit. Is wiring connection for SW Correctly connect the wiring BOX incorrect?
  • Page 193 Troubleshooting Alarm Incorrect Indoor Unit Connection No. Setting (SW BOX) Code ● LED (LED10, 11, 12) on SW BOX PCB flashes(for multiple branch types SW BOX,only LED on PCBs with abnormality flashes). ★ <Heat Recovery System> This alarm code is indicated when nine or more indoor units are connected to SW BOX. Are 9 or more indoor units Correctly connect the wiring connected to SW BOX?
  • Page 194 Troubleshooting Alarm Incorrect Indoor Unit Connection (SW BOX) Code ● LED (LED5, 6 ) on SW BOX PCB flashes ★ <Heat Recovery System> This alarm code is indicated when indoor unit with different refrigerant cycle group is connected to SW BOX. Is wiring connection for SW Correctly connect the wiring BOX incorrect?

  • Page 195: Troubleshooting In Check Mode By Remote Control Switch

    Troubleshooting 1.2.3 Troubleshooting in Check Mode by Remote Control Switch 1.2.3.1 Check Mode Each "Check Menu" item and its function are explained in the following table. Check Menu Item Function Check 1 Sensor condition of air conditioner will be monitored and indicated. Check 2 Sensor data of air conditioner prior to alarm occurrence will be indicated.
  • Page 196 Troubleshooting (1) Contents of Check Mode 1 Indication of Category Code Temperature Indication Indication of Temperature, etc. Indoor Unit Temp . …… Temperature Displayed Normal Setting Thermistor Open-circuited or PCB Defected Abnormal Indoor Unit (Temp. for Top of Comp.: 129) Intake Air Temp.
  • Page 197 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 Indoor Unit 20A1 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 198 Troubleshooting Compressor Pressure/Frequency Indication Discharge Pressure (High) (x 0.1 psi) Suction Pressure (Low) (x 0.01 psi) 22 Control Information This is an indication for internal information for the remote control switch. This does not have any specific meaning. Operatio This is an indication for frequency of Inverter. equency (Hz) Indoor Unit Capacity Indication The capacity of the indoor unit is indicated as shown...
  • Page 199 Troubleshooting (2) Contents of Check Mode 2 Indication of Category Code Temperature Indication Indication of Temperature, etc. Indoor Unit Intake …… Temperature Displayed Normal Air Temp. at Thermistor (Thermistor Open-circuited or PCB Defected) Abnormal Indoor Unit (Temp. for Top of Comp.) Discharge Air Temp.
  • Page 200 Troubleshooting Compressor Pressure/Frequency Indication Discharge Pressure (High) (x 0.1 psi) Suction Pressure (Low) (x 0.01 psi) 11 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 201: Alarm History Display

    Troubleshooting 1.2.3.2 Alarm History Display The alarm history display is available to be set from the check menu. ● Setting Method ● Select “Alarm Record” ※To Erase Alarm Record Press “ ” when the abnormality record is indicated. After that, the confirmation interface will be displayed.

  • Page 202: Troubleshooting By 7-Segment Display

    Troubleshooting 1.2.4 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-segment and push switches on the PCB in the outdoor unit. (1) Before Checking (a) Turn ON main power supply.
  • Page 203 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 controls are activated, code number with higher priority will be indicated (see below for the priority order).
  • Page 204 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 ε>8.2 Pressure Ratio Protection Control Compression Ratio ε<2.0 Discharge Pressure High-Pressure Increase Protection...
  • Page 205 Troubleshooting (5) Alarm Code Refer to the item 1.2.1. (6) Checking Method by Checking Mode Menu Press PSW1 for once. To Start Checking Press PSW1 for more than (A) Outdoor Combination Unit No. Check Mode 3 seconds. “CHEC” The outdoor combination unit No. is “Menu”...
  • Page 206 Troubleshooting (B) Outdoor Unit Information Select the outdoor unit No. to be displayed, press PSW4 ( ▼ ) to forward or PSW2 Unit Indication ( ▲ ) to backward. Unit A (No.0) Select the outdoor combination unit No. for indication by pressing PSW4 or PSW2. Press PSW3( ▶...
  • Page 207 Troubleshooting ● Outdoor Unit Capacity Table Indication Capacity (HP) Model (kBtu/h) NOTE: In case of combination unit, the indication of outdoor unit capacity is total capacity of construction units. … … … HP×8 ≈HP×9.83 (C) Indoor Unit Information Unit No. Indication This information is indicated on the unit A (main unit) only.
  • Page 208 Troubleshooting (D) Cause of Alarm Code This information is indicated on the unit A (main unit) only. Press PSW4 ( ▼ ) to forward of press PSW2 ( ▲ ) for backward. The information will be indicated alternately as “Item”→“Details”. Details of Indication 7-Segment Display Item...
  • Page 209 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. ● Indicated Running Current of Compressor MC2 The running current of the compressor MC2 is detected by current sensor. (CT2) ●...

  • Page 210: Function Of Rsw, Dsws And Leds

    Troubleshooting 1.2.5 Function of RSW, DSWs and LEDs Arrangement Inside Electrical Box ● AVWT-72~96FFFH Front Side (Main) Interior of Electrical Control Box (Main)
  • Page 211 Troubleshooting ● AVWT-120FFFH Front Side (Main) Invert PCB Interior of Electrical Control Box (Main)
  • Page 212 Troubleshooting ● AVWT-144~192FFFH Front Side (Main) Invert PCB2 Invert PCB1 Interior of Electrical Control Box (Main)
  • Page 213 Troubleshooting ● LEDs and SEGs on PCB Part Name Contents of Functions Power Supply Indication for Outdoor Unit PCB (Low Voltage) LED1 (Red) Normal Condition: Activated Abnormal Condition: Deactivated This LED2 indicates the transmission state between the outdoor unit PCB and inverter PCB. LED2 (Green)a Normal Condition: Flashing...
  • Page 214 Troubleshooting ● Procedure of Checking Inverter PCB <Procedure> a . Turn OFF the main switches and wait for three minutes. Check to ensure that no high voltage exists. If LED3 is ON after start-up and LED3 is OFF after turning OFF power supply, the voltage will decrease lower than DC50V.
  • Page 215 Troubleshooting ● Procedure of Checking Fan Controller <Procedure> (a) Turn OFF the power supply switches before this work. Also ensure that LED501 (Red) on the fan controller is turned OFF. If LED501 is ON, electric shock may occur. (b) Disconnect all the wirings connected to the fan controller. Measure the resistance between terminals using the tester.
  • Page 216 Troubleshooting ● Checking Method of Electronic Expansion Valve Indoor Unit Electronic Expansion Valve Outdoor Unit Electronic Expansion Valve Check for the liquid pipe temperature during heating Locked (Fully It is abnormal if the liquid pipe pressure does not increase operation. Closed) during cooling operation It is abnormal if the temperature does not increase.
  • Page 217 Troubleshooting ● Checking of Electrical Coil Parts Resistance Name of Parts Model Electrical Wiring Diagram Wiring No. (Ω) U: Red DC Fan Motor for White-Black Outdoor Unit DMLBA05QH Black-Red 2.4+0.3 AVWT-72~96FFFH 750W Red-White AVWT-144~192FFFH V: White W: Black U: Red DC Fan Motor for White-Black DMLBA06QH...
  • Page 218 Troubleshooting ● Checking of Compressor CHECK LIST ON COMPRESSOR CLIENT: MODEL: DATE: Serial No.: Production Date: Checker: Check Item Check Method Result Remarks (1) Are wires of each thermistor correctly connected by viewing? Are THM8 and THM9 correctly connected? (2) Check to ensure that 7-segment indication of Td1 THM8 and THM9: Discharge Gas Thermistor is higher than Td2 when No.1 comp, is operating.
  • Page 219 Troubleshooting Additional Information for “CHECK LIST ON COMPRESSOR” Check Item Additional Information (Mechanism of Compressor Failure) 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 1 &...

  • Page 220: Servicing

    Servicing 2. Servicing Use the specified non-flammable refrigerant (R410A) to the outdoor unit in the refrigerant cycle. Do not charge materials other than R410A into the unit such as hydrocarbon refrigerants (propane or etc.), oxygen, flammable gases (acetylene or etc.) or poisonous gases when installing, maintaining and moving the unit.

  • Page 221: Attaching Front Service Cover

    Servicing TURN OFF all the power switches. 2.2 Attaching Front Service Cover (1) Attaching Piping Cover (a) Put the piping cover 45° obliquely (Refer to Fig.1), then insert the hook of the piping cover into the edge of the floor cover.

  • Page 222: Removing Top Cover

    Servicing TURN OFF all the power switches. 2.3 Removing Top Cover (1) Remove screws fixing in the top cover. AVWT-72~96FFFH: 8 screws AVWT-120~192FFFH:10 screws (2) Lift the top cover up. Tool Phillips Screwdriver ● AVWT-120~192FFFH ● AVWT-72~96FFFH Upper Side Upper Side Front/Rear Side Front/Rear Side...

  • Page 223: Removing Shroud

    Servicing TURN OFF all the power switches. 2.4 Removing Shroud (1) Remove the top cover according to the item 2.3 “Removing Top Cover”. (2) Remove the service cover according to the item 2.1 “Removing Front Service Cover”. (3) Remove screws fixing the upper cover and then lift the upper cover up. AVWT-72~96FFFH: 4 screws AVWT-120~192FFFH: 5 screws Tool...

  • Page 224: Removing Electrical Box Cover

    Servicing TURN OFF all the power switches. 2.5 Removing Electrical Box Cover (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Remove two (2) screws fixing in the electrical box cover and loosen the other two (2) fall-prevention screws. (3) Push the electrical box cover up and draw it frontward from the fall-prevention screws.

  • Page 225: Removing Electrical Box

    Servicing TURN OFF all the power switches. 2.6 Removing Electrical Box (1) Remove the service cover and front cover according to the item 2.1 “Removing Front Service Cover”. (2) Remove the electrical box cover according to the item 2.5 “Removing Electrical Box Cover”. (3) Remove the M4 bolts (3 for single fan, 6 for dual fan) in position ①...

  • Page 226: Removing E-Box Stay

    Servicing TURN OFF all the power switches. 2.7 Removing E-Box Stay (1) Remove the electrical box according to the item 2.6 “Removing Electrical Box”. (2) Remove the screws fixing in the E-Box stay. AVWT-72~96FFFH: 4 screws AVWT-120~192FFFH: 6 screws The position of the screws can be seen in the figures below. Lift the E-Box stay up.

  • Page 227: Removing Air Grille

    Servicing TURN OFF all the power switches. 2.8 Removing Air Grille (a) Remove the screws (4 for single fan, 8 for double fan) fixing in the air grille. (b) Remove the air grille. Tool Phillips Screwdriver Screw Screw Screw Air Outlet Grille Air Outlet Grille Shroud...

  • Page 228: Removing Outdoor Fan

    Servicing TURN OFF all the power switches. 2.9 Removing Outdoor Fan (1) Remove the air grille according to the item 2.8 “Removing Air Grille”. Adjustable Wrench, Spanner, Puller, Tool Phillips Screwdriver, Nippers, Box Wrench Fan Motor Fan Motor (2) Remove the closing nut and the flawasher fixing in the propeller fan onto the motor shaft with an box wrench. (3) Remove the propeller fan from the motor shaft (Lift the propeller fan up).
  • Page 229 Servicing TURN OFF all the power switches. (4) Removing Wire (a)Remove the service cover and the electrical box cover according to the item 2.1 “Removing Front Service Cover” and the item 2.5 “Removing Electrical Box Cover”. (b) Disconnect the wire connector for the fan motor in the electrical box. (c) Unfix the lead wire connecting the electrical box and the fan motor.

  • Page 230: Removing Compressor

    Servicing TURN OFF all the power switches. 2.10 Removing Compressor (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Remove the electrical box cover according to the item 2.5 “Removing Electrical Box Cover”. (3) Remove the electrical box according to the item 2.6 “Removing Electrical Box”.
  • Page 231 Servicing TURN OFF all the power switches. (7) Release the bind lace and Nylon strap for the RC cover to remove. NOTE: 1. When removing the RC cover, take special care not to deform the piping around the cover. The brazing parts may be damaged due to pipe deformation.
  • Page 232 Servicing TURN OFF all the power switches. (8) Remove the terminal box cover for the compressor and disconnect the wiring to the compressor terminals. Then, check the terminal Nos. and the mark band Nos.. Match the terminal Nos. with the mark band Nos. when rewiring the compressor.
  • Page 233 Servicing TURN OFF all the power switches. (10) Disconnect the discharge and suction pipes and the oil discharge pipes and refrigerant injection pipes from the compressor. Check that the air pressure in the piping is equal to the atmospheric pressure. Then, cut the pipes at the closer position to the compressor from each brazing part.
  • Page 234 Servicing TURN OFF all the power switches. (11) Remove four (4) nuts fixing the compressor and remove the compressor. Adjustable Wrench, Box Wrench, Tool Phillips Screwdriver, Spanner View from Top of Compressor Nut Fixing Position Compressor Suction Pipe Discharge Pipe Oil Discharge Pipe Nut Fixing Position Nut Fixing Position...
  • Page 235 Servicing TURN OFF all the power switches. (12) Withdraw the remaining refrigerant oil in the compressor from the discharge pipe,and measure the oil quantity. NOTE: 1. Additional refrigerant oil charge is required if: remaining refrigerant oil quantity in the old compressor > pre-charged refrigerant oil in the new compressor 2.
  • Page 236 Servicing TURN OFF all the power switches. (13) Mount the new compressor. Attaching the nuts first and then perform brazing according to the following order: (a) Oil Discharge Pipe (b) Discharge Pipe (c) Suction Pipe (d) Injection Pipe NOTE: 1. When mounting the new compressor on the base, take special care not to contact the piping. If contacted, piping may be deformed.
  • Page 237 Servicing TURN OFF all the power switches. (14) Wind the crankcase heater around the compressor. (15) Attach the RC cover to the compressor. (16) Reconnect all wires. (a) The crankcase heater lead wire and the power line shall be fixed inside the RC cover with tacks T), without contacting the piping.
  • Page 238 Servicing TURN OFF all the power switches. (c) Fix the cover firmly with two tacks to prevent water from entering from the clearance between the RC cover and the sound proof cover. (Example) Sound Proof Cover Notch (Outlet for Td Thermistor Lead Wire) Suction Pipe Notch (Outlet for PSH Lead Wire)
  • Page 239 Servicing TURN OFF all the power switches. (17) Perform the final check for wiring conditions referring to the figure below. NOTE: Check that all wires do not contact the compressor, piping and plate edges. If any of the wires contacts with them, wire breakage or fire may occur.

  • Page 240: Replacing Refrigerant Oil

    Servicing TURN OFF all the power switches. 2.11 Replacing Refrigerant Oil 2.11.1 Replacing Refrigerant Oil (No Clogging in Return Oil Circuit) (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Close (A) high / low pressure gas stop valve and (C) liquid stop valve, then open (B) low pressure gas stop valve. NOTE: For heat recovery system, If the refrigerant piping are removed, seal (B) low pressure gas stop valve with a copper cap at the brazing portion before open it.

  • Page 241: Replacing Refrigerant Oil (Clogging In Return Oil Circuit) And Replacing Return Oil Circuit

    Servicing TURN OFF all the power switches. 2.11.2 Replacing Refrigerant Oil (Clogging in Return Oil Circuit) and Replacing Return Oil Circuit (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Remove the electrical box, wirings and E-box stay according to the item 2.6 “Removing Electrical Box” (3) Close (A) high / low pressure gas stop valve and (C) liquid stop valve, then open (B) low pressure gas stop valve.
  • Page 242 Servicing TURN OFF all the power switches. (5) Brazing (G) return oil circuit from (J) oil separator outlet port and (I) suction pipe brazing port at the point indicated in the figure. Remove (G) return oil circuit from the unit. Then seal (I) suction pipe brazing port with 3M tape. Make sure the high pressure gas can not leak from here.
  • Page 243 Servicing TURN OFF all the power switches. (6) Connect a charging hose to (J) brazing part of oil separator outlet port. Then, charge nitrogen (22psi (0.15MPa)) from (E) Low Pressure Check Joint, and collect refrigerant oil in (H) Oil Separator. NOTE: In the case that the unit has two (2) return oil circuits and two (2) oil separators, collect the refrigerant oil at the same time.

  • Page 244: Removing Coils

    Servicing TURN OFF all the power switches. 2.12 Removing Coils The following figures indicate the position of coils <Coil Position> ● AVWT-72~96FFFH SVA: Solenoid Valve Coil SVC: Solenoid Valve Coil SVG1: Solenoid Valve Coil SVG2: Solenoid Valve Coil SVJ: Solenoid Valve Coil SVS: Solenoid Valve Coil RVR1: Reversing Valve Coil RVR2: Reversing Valve Coil...
  • Page 245 Servicing AVWT-144~192FFFH...

  • Page 246: Removing Expansion Valve Coil (Mv5, Evb, Evo1, Evo2)

    Servicing TURN OFF all the power switches. 2.12.1 Removing Expansion Valve Coil (MV5, EVB, EVO1, EVO2) (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Turn the expansion valve coil in a counterclockwise direction as shown in the figure below . Remove the expansion valve coil bracket from the expansion valve slot.

  • Page 247: Removing Solenoid Valve Coil (Sva, Svc, Svg, Svj, Svs)

    Servicing TURN OFF all the power switches. 2.12.2 Removing Solenoid Valve Coil (SVA, SVC, SVG, SVJ, SVS)、 (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Remove one (1) screw fixing the solenoid valve coil with a phillips screwdriver. If the screw is difficult to remove, use a spanner or an adjustable wrench.

  • Page 248: Removing Solenoid Valve (Sva ,Svc,Svg,Svj And Svs)

    Servicing TURN OFF all the power switches. 2.12.3 Removing Solenoid Valve (SVA ,SVC,SVG,SVJ and SVS) (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) <Heat Pump System> Close the high / low pressure gas stop valve and the liquid stop valve. <Heat Recovery System>...

  • Page 249: Removing Reversing Valve Coil (Rvr1, Rvr2)

    Servicing TURN OFF all the power switches. 2.12.4 Removing Reversing Valve Coil (RVR1, RVR2) (1) Remove one (1) screw fixing the reversing valve coil with a phillips screwdriver. If the screw is difficult to remove, use a spanner or an adjustable wrench (2) Remove the reversing valve coils.

  • Page 250: Removing Reversing Valve

    Servicing TURN OFF all the power switches. 2.12.5 Removing Reversing Valve (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Remove the electrical box, wirings and E-box stay according to the item 2.6 “Removing Electrical Box” and the item 2.7 “Removing E-Box Stay.”...
  • Page 251 Servicing TURN OFF all the power switches. Adjustable Wrench or Spanner, Tool Phillips Screwdriver, Burner, Pipe Cutter, Pliers, Pincher, Charging Hose <Reversing Valve Position> ● AVWT-72~96FFFH RVR2 RVR1 Brazing Part Brazing Part Brazing Part ● AVWT-120~192FFFH RVR1 RVR1 Brazing Part Brazing Part...

  • Page 252: Removing Stop Valve

    Servicing TURN OFF all the power switches. 2.13 Removing Stop Valve (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Collect all the refrigerant in the refrigerant cycle. (3) When removing (A) high / low pressure gas stop valve and (B) low pressure gas stop valve, cover the stop valves with wet cloth for cooling and then remove the brazing.

  • Page 253: Removing High Pressure Switch, High Pressure Sensor, Low Pressure Sensor And Thermistor

    Servicing TURN OFF all the power switches. 2.14 Removing High Pressure Switch, High Pressure Sensor, Low Pressure Sensor and Thermistor (1) Remove the front service cover according to Item 2.1 “Removing Front Service Cover”. (2) High Pressure Switch (PSH1 and PSH2), High Pressure Sensor, Low Pressure Sensor and Thermistor (Tg, Tsc, Tchg, Tbg ,Td and Te) are fixed as shown in the figure below.
  • Page 254 Servicing ● AVWT-120FFFH High Pressure Sensor Low Pressure Sensor PSH1 Tg Thermistor (High Pressure Switch) (Evaporation Gas Line) Te2 Thermistor Tbg Thermistor (Evaporation Liquid Line) (Sub Cooling Bypass Line) (inlet pipe of the subcooler） Te1 Thermistor Td1 Thermistor (Evaporation Liquid Line) (Compressor) Tchg Thermistor (Sub Cooling Main Line)

  • Page 255: Removing High Pressure Switch (Psh1 And Psh2)

    Servicing TURN OFF all the power switches. 2.14.1 Removing High Pressure Switch (PSH1 and PSH2) (1) Collect the refrigerant. (2) Disconnect the fasten terminals. (3) Remove the high pressure switch from the brazing part of the discharge pipe with a burner. NOTE: 1.

  • Page 256: Removing Thermistor For Liquid Pipe

    Servicing TURN OFF all the power switches. 2.15 Removing Thermistor for Liquid Pipe (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Remove the electrical box cover according to the item 2.5 “Removing Electrical Box Cover”. (3) Remove the rubber cement.

  • Page 257: Removing Thermistor For Ambient Temperature

    Servicing TURN OFF all the power switches. 2.16 Removing Thermistor for Ambient Temperature (1) Remove the front service cover according to the item 2.1 “Removing Front Service Cover”. (2) Remove the electrical box cover according to the item 2.5 “Removing Electrical Box Cover”. (3) Remove the upper cover according to the item 2.3 “Removing Top Cover”.

  • Page 258: Removing Other Electrical Components

    Servicing TURN OFF all the power switches. 2.17 Removing Other Electrical Components NOTE: 1. When reassembling the electrical components, match the terminal Nos. with the mark band Nos. . If they are incorrectly connected, malfunction may occur or the electrical components may be damaged. 2.

  • Page 259: Removing Outdoor Unit Pcb And Electrical Components For Electrical Box

    Servicing TURN OFF all the power switches. 2.17.1 Removing Outdoor Unit PCB and Electrical Components for Electrical Box < Removing Outdoor Unit PCB > (1) Remove all the connectors for wiring connected to the outdoor unit PCB. (2) Put you hand on the buckle,then,Push the buckle outward,Remove the outdoor unit PCB.(Refer to fig.1) <...
  • Page 260 Servicing TURN OFF all the power switches. Tool Phillips Screwdriver, Long-Nose Pliers, Pliers ● AVWT-72~96FFFH (Screw for Outdoor Unit PCB Fixing Plate) Front Side (For Main) The Interior of the Electrical Box (For Main) DCL1 DCL1 Invert PCB1 Invert PCB1 ●...
  • Page 261 Servicing ● AVWT-144~192FFFH Front Side (For Main) The Interior of the Electrical Box (For Main) (Screw for Outdoor Unit PCB Fixing Plate) DCL1 DCL2 DCL1 DCL2 Invert PCB1 Invert PCB1 Invert PCB1 Invert PCB1 Item Part Name Item Part Name Outdoor Unit PCB Inverter PCB1/PCB2 Inverter PCB...

  • Page 262: Removing Inverter Pcb

    Servicing TURN OFF all the power switches. Do not touch any electrical components while LED3 (Red) on Inverter PCB is ON. Otherwise, an electric shock will occur. 2.17.2 Removing Inverter PCB (1) Disconnect all the wirings connected to the CN3, CN4, CN5, CN206, CN207, PCN1, PCN2. (2) Disconnect the wirings for the Inverter PCB(U,V,W,T,S,R,N,N1,DCL1,DCL2).

  • Page 263: Mount The Electrical Box In The Reverse Procedure

    Servicing TURN OFF all the power switches. 2.17.3 Mount the electrical box in the reverse procedure. NOTE: 1. Check to ensure that the tube end of waterproof vinyl pipe and the connectors are in the electrical box. Fix them firmly with a cord clamp when wiring up as shown in the figure below. 2.

  • Page 264: Removing Components For Switch Box

    Servicing TURN OFF all the power switches. 2.18 Removing Components for Switch Box 2.18.1 Removing Service Cover for Electrical Box and Electronic Expansion Valve (1) Remove the screws securing the electrical box cover and the electronic expansion valve cover. HCHS-N06XB,HCHS-N10XB Service Cover for Electrical Box: 2 screws Service Cover for Electronic Expansion Valve: 2 screws...
  • Page 265 Servicing HCHM-N04XB Service Cover for Electronic Expansion Valve Electrical Box Cover Service Cover for HCHM-N08XB Electronic Expansion Valve Electrical Box Cover Service Cover for HCHM-N12XB Electronic Expansion Valve Electrical Box Cover HCHM-N16XB Service Cover for Electronic Expansion Valve Electrical Box Cover...
  • Page 266 Servicing TURN OFF all the power switches. 2.18.2 Removing Electrical Components Removing Switch Box PCB (1) Remove all the connectors for wiring connected to the switch box PCB. (2) Remove the communication wirings connected to the switch box PCB. Do not touch the electrical components on the switch box PCBs during the work.
  • Page 267 Servicing HCHM-N04XB Pinch here with long nose pliers to remove the switch box PCB. Switch Box PCB Board Electrical Box Holder Board Holders Electrical Box Cross Section P-P Securing Screw (M4) for Terminal Block (TB1) Board Holders Securing Screw (M4) for Terminal Block (TB2) Securing Screws (M3.5) for Wiring of Terminal Block (TB4)
  • Page 268 Servicing HCHM-N12XB Pinch here with long nose pliers to remove the switch box PCB. Switch Box PCB Board Holder Electrical Box Cross Section P-P Board Holders Board Holders Securing Screw (M4) for Electrical Box Terminal Block (TB1) Securing Screws (M3.5) for Screws (M3.5) for Screws (M3.5) for Wiring of...
  • Page 269 Servicing TURN OFF all the power switches. 2.18.3 Removing Electric Expansion Valve Coil (1) Remove the front service cover . (2) Removing Electronic Expansion Valve (MVD1~4, MVS1~4) (a) Turn the electronic expansion valve coil. Remove the electronic expansion valve coil bracket from the electronic expansion valve slot.
  • Page 270 Servicing HCHM-N04XB Cable Bands Wire Clips MVD1 MVD2 MVD3 MVD4 MVS2 MVS3 MVS4 MVS1 Electrical Box HCHM-N08XB Cable Bands Wire Clip Wire Clips MVD1 MVD1 MVD2 MVD3 MVD4 MVD2 MVD3 MVD4 Cable Band MVS1 MVS2 MVS3 MVS4 MVS2 MVS3 MVS4 MVS1 Electrical Box Wire Clip...
  • Page 271 Servicing HCHM-N16XB...
  • Page 272 Main Parts 3. Main Parts 3.1 Inverter 3.1.1 Specifications of Inverter Applicable Model AVWT-72-192* Applicable Power Supply 3 Phase, 208/230V10%, 60Hz Output Voltage (Maximum) 295-325V Output Current (Maximum) Inverter PCB Fan Controller Control Method Vector PWM Control Range Output Frequency 7 - 88Hz Inverter PCB Fan Controller...
  • Page 273 Main Parts Current Rated Current of Power Integrated Module (PIM) Rated Current ×105% Protection Function Overcurrent Protection for Inverter 10ms 50ms Time (1) Short-Circuit Trip of Arm (2) Instantaneous Overcurrent Trip (3) Instantaneous Overcurrent Trip When detecting current is more than rated current of Power Integrated Module, overcurrent is detected.
  • Page 274 Main Parts 3.1.3 Protective Function (1) Excessive High or Low Voltage for Inverter (a)Level of Detection When the voltage of direct current is greater than 388V, abnormalities are detected. When the voltage of direct current is smaller than 192V, abnormalities are detected. (b)Function When abnormalities are detected, the inverter compressor is stopped and transmit the signal code of stoppage cause to outdoor unit PCB.
  • Page 275 Main Parts (6) Earth Detection (a) Level of Detection ① When the terminal U, V, W and earth of the compressor are short-circuited before compressor activation, abnormalities are detected. ② When the output terminals (U, V, W) of transistor module (PIM) are short-circuited, abnormalities are detected. (b) Function When abnormalities are detected, the inverter compressor is stopped and the signal code of stoppage cause is transmitted to outdoor unit PCB.
  • Page 276 Main Parts 3.2 Electronic Expansion Valve Micro-Computer Pulse Signal Pulse Motor 2-Phase Permanent Magnetic Pulse Motor Control 0 to 2950 Pulse by 1 Pulse (EVO) Control 0 to 480 Pulse by 1 Pulse (EVB/MV5) Refrigerant Flow Control Precise Control Needle Specification Items Specification...
  • Page 277 Main Parts 3.3 Pressure Sensor (1) High Pressure Control The high pressure during heating operation is detected by a high pressure sensor, and compressor frequencies are controlled by the proportional controlling method with operating capacity of indoor units (or PID Control for Compressor Frequency) so that the high pressure is controlled in an appropriate range.
  • Page 278 Main Parts 3.4 Noise Filter (NF1, NF2) The noise filter decreases the leakage of noise made by the inverter to the power supply side. Terminals indicated with “OUTPUT” are connected to the inverter side and terminals indicated with “INPUT” to the power supply side. 208/230V,60Hz (NF1) Items Specification...
  • Page 279 Main Parts 208/230,60Hz (NF2) Items Specification Model NFT-060500-HHB0 Rated Current AC 208/230V 50A Permissible Temperature Range -13 to 140°F(-25℃ to +60℃ ) Circuit Diagram unit: in.(mm) 6* Φ11/64± 1/64 (Φ4.2±0.2) 17/64 (7.0) 3-15/64±1/64 (82±0.5) 4-41/64±1/64 (118±0.5) 8-27/64±3/64 (214±1.0)
  • Page 280 Main Parts 3.5 Reactor (DCL1,DCL2) This part is used for changing the alternative current to the direct current for the inverter. 208/230,60Hz (DCL1) Items Specification Character 0.7mH±10% (at 1kHz) Rated Current Direct Current Resistance 11mΩ± 15% (at 68°F(20℃ )) Permissible Temperature Range -4 to 158°F (-20℃...
  • Page 281 Main Parts 208/230V,60Hz (DCL2) Items Specification Character 0.7mH±10% (at 1kHz) Rated Current Direct Current Resistance 11mΩ± 15% (at 68°F(20℃ )) Permissible Temperature Range -4 to 158°F (-20℃ to +70℃ ) unit: in.(mm) 2-13/16±3/64 (71.5±1.0) 2-23/64±7/32 (60±5) 27-35/64±25/32 (700±20) 29-9/64±25/32 (740±20) 41/64±5/64 (16.25±2) Max.27/32(21.5)
  • Page 282 Optional Function 4. Optional Function 4.1 Setting Method Setting PSW on the outdoor unit PCB is required for “External Input and Output Setting” and “Function Setting”. As for combination of outdoor units, this must be set from the PSW in outdoor unit A. (Setting from the PSW in outdoor unit B,C and D is invalid.) After the setting is completed, press PSW1 for 3 seconds when “Menu Mode”...
  • Page 283 Optional Function 4.2 External Input and Output Setting On the outdoor unit PCB, there are three input terminals (CN17, CN18) to receive external signals and two output terminals (CN16) to send signals outwards. Control functions shown in the table below are available by setting input and output terminals.
  • Page 284 Optional Function ● Setting of External Input and Output In the case that the setting alteration is required at site, perform the following procedures. For the combination of outdoor units, perform the setting to the outdoor unit A. (1) By selecting “External Input and Output Setting”, the following appears on the 7-segment display. (The setting should be performed during the outdoor unit stoppage.) SEG2 SEG1...
  • Page 285 Optional Function 4.2.1 Input Fixing Heating Operation Mode (Control Function No.1), Input Fixing Cooling Operation Mode (Control Function No.2) When the input terminals for fixing operation mode on the outdoor unit PCB are short-circuited, the operation mode can be fixed at the cooling or heating mode Short Circuit between Terminals 1 and 2 of CN17: Fixed Heating Operation Mode Short Circuit between Terminals 2 and 3 of CN17: Fixed Cooling Operation Mode During this fixed heating (or cooling) mode, no cooling (or heating) operation is available.
  • Page 286 Optional Function 4.2.3 Input Outdoor Fan Motor Start/Stop (Control Function No.4) This is an auxiliary function to protect the outdoor unit from snow. When the input terminals for Outdoor Fan Motor Start/Stop on the outdoor unit PCB are short-circuited during the compressor stoppage, all the outdoor fan motors start operating. If the compressor restarts operating, the outdoor fan motors will be restored to normal operation.
  • Page 287 Optional Function 4.2.4 Input Forced Stoppage (Control Function No.5) When the input terminals for the forced stoppage on the outdoor unit PCB are short-circuited during running, the compressor and the indoor fan motor are stopped. However, the remote control switch display remains the same mode as the stoppage code No.
  • Page 288 Optional Function 4.2.6 Input Low Noise Setting 1, 2, 3 (Control Function No.11 to 13) ) When the input terminals for low noise setting on the outdoor unit PCB are short-circuited, the compressor frequency and outdoor fan rotation frequency are controlled and the operating sound of the outdoor unit will be given as shown in the table below.
  • Page 289 Optional Function Table 4.1 Specifications of Required Main Part Parts Specification Remarks Auxiliary Relay (X1, X2) Mini-Power Relay, MY1F (or 2F) made by OMRON 208V/230V Changeover Switch (SS2, SS3) Manual Switch 208V/230V PCC-1A Five Cords with 3 Pin Connector Cord (Connected to JST Connector, XARP-3) Connectors as One Set Low Volt.
  • Page 290 Optional Function ● External Output Function Setting The following signals can be picked up from the outdoor unit PCB. Refer to the table 4.2 for the required main parts. 4.2.7 Output Operation Signal (Control Function No.1) This function is utilized to receive the operation signal. Auxiliary relay contacting (RYa) is closed during the operation.
  • Page 291 Optional Function 4.2.9 Output Compressor ON Signal (Control Function No.3) This function is utilized to receive the compressor operation signal. Auxiliary relay contacting (RYa) is closed during the compressor operation. • Setting Example Alarm Signal at Output 2 (between 1 and 3 pins of CN16) Auxiliary Relay 3P Connector Housing 1 2 3...
  • Page 292 Optional Function 4.3 Function Setting (1) The setting should be performed during the outdoor unit stoppage. For the combination of outdoor units, set it to the outdoor unit A. (The setting can not be performed to the outdoor unit B, C and D.) The outdoor unit A is the unit to which the control cable between outdoor unit and indoor unit is connected.
  • Page 293 Optional Function PSW4 ( ) PSW2 ( ) Setting Item (for setting item No.1) is indicated. Select a setting condition while setting items PSW4 ( ) PSW2 ( ) are indicated. Press PSW3 (on the right side) to increase the setting condition number. Setting Item (for setting item No.2) is indicated.
  • Page 294 Optional Function 4.3.1 Circulator Function at Heating Thermo-OFF (Control Function FA) Press “PSW3” and select the setting conditions “0 to 4” in the circulator function at heating Thermo-OFF “FA”. Normally, the fan speed is changed to “LOW” at heating Thermo-OFF. (There is a case that the room temperature is too high at the heating Thermo-OFF.) However, the indoor fan motor is operated at “LOW”...
  • Page 295 Optional Function 4.3.2 Night-Shift (Low Noise) Press “PSW3” and select the setting condition “1” at the night shift (low noise) “ ”. Then, this function can be set. This setting is available when the ambient temperature is 86°F(30℃ ) or less at the cooling operation. The outdoor fan operation is controlled by fan controller as shown below.
  • Page 296 Optional Function 4.3.3 Cancellation of Outdoor Ambient Temperature Limit Press “PSW3” and select the setting condition “0” to “3” at the cancellation of outdoor ambient temperature limit of “ ”. Then, this function can be set. The heating operation is continued even under a high outdoor temperature or the cooling operation is continued even under a low temperature.
  • Page 297 Optional Function 4.3.5 SLo Defrost Setting (1) Press “PSW3” and select the setting condition “0” to “5” at the SLo defrost setting “ “. (2) This function “ “=0 can stop indoor fan during the defrost operation and at the start of the heating operation. (3) However, this function “...
  • Page 298 Optional Function db=9 db=8 db=7 Outdoor Unit Capacity Capacity Capacity Operating Noise Operating Noise Operating Noise Capacity(kBtu/h) (Compared to (Compared to (Compared to (Targeted Value) (Targeted Value) (Targeted Value) dB=0) dB=0) dB=0) 46db 48db 50db 46db 48db 50db 48db 50db 52db 49db 51db...
  • Page 299 Optional Function 4.3.9 Wave Function Setting Press “PSW3” and select the setting condition “0” to “4”, so that the wave function setting “ ” can be set. While this function is activated, the maximum limit of running current is changed from 40% to 80% as shown in the figure NOTE: In the case that the demand current control by external input is set and the external input signal is available, this function is not available even when the demand current control by external input signal is performed.
  • Page 300 Optional Function 4.3.12 Outdoor Fan Motor Intermitted Operation Setting Press “PSW3” and set the Outdoor Fan Motor Intermitted Operation Setting “ ” (auxiliary function) to protect the outdoor fan motor from snow. Set this function to the PCB of the outdoor unit set as the main outdoor unit. All the outdoor fan motors start intermitted operation (t1/600s).
  • Page 301 Optional Function 4.3.13 Function Setting 7-Segment Display Setting Item Contents SEG2 SEG1 Not Available (Default Setting) Indoor fan forced ON and OFF (2 min, ON 16 min, OFF) Circular at heating Indoor fan forced ON and OFF (2 min. ON /13 min. OFF) function Thermo-off Indoor fan forced ON and OFF (2 min.
  • Page 302 Optional Function 7-Segment Display Setting Item Contents SEG2 SEG1 Default Setting (refer to control parameters) Expansion valve opening 150~325 Initial opening of indoor Expansion valve opening 05~19kBtu/h: 175 pulse, 22kBtu/h or over: 300 pulse expansion valve at heating Expansion valve opening 05~19kBtu/h: 100 pulse, 22kBtu/h or over: 150 pulse operation stoppage Expansion valve opening 05~19kBtu/h: 90 pulse, 22kBtu/h or over: 100 pulse Expansion valve opening 05~19kBtu/h: 40 pulse, 22kBtu/h or over: 40 pulse...
  • Page 303 Field Work Instruction 5. Field Work Instruction Refer to “Troubleshooting” when dealing with troubles. If the trouble cannot be solved, contact your dealer. 5.1 Caution for Refrigerant Leakage In the room where the packaged air conditioner is installed, the refrigerant gas should be controlled not to exceed the limit concentration in case of the refrigerant leakage.
  • Page 304 Field Work Instruction 5.2 Maintenance Work (1) For Outdoor Unit and Indoor Unit (a) Fan and Fan Motor ●Lubrication - All fan motors are pre-lubricated and sealed at the factory. Therefore, no lubricating maintenance is required. ●Sound and Vibration - Inspect for abnormal sound and vibration. ●Rotation - Inspect for clockwise rotation and rotating speed.
  • Page 305 Field Work Instruction 5.3 Service and Maintenance Record by 7-Segment Display Customer’s Name DATE: Outdoor Unit Model (Serial No. (Serial No. (Serial No. (1) Operation Mode (2) Test Run Start Time (3) Data Collect Start Time (4) Read Out Data from 7-Segment in Outdoor Unit Protection Control Code Operating Capacity Outdoor Total Connecting Capacity...
  • Page 306 Field Work Instruction 5.4 Service and Maintenance Record by Remote Control Switch Data Sheet for Checking by Remote Control Switch Time I.U. Model I.U. Serial No. I.U. No. / Alarm Code Check Check 1 • 2 1 • 2 1 • 2 1 •...
  • Page 307 Field Work Instruction 5.5 Service & Maintenance Record Service and Maintenance Record Check Item Action Judgement Is service space sufficient YES or NO Short Circuit of Discharge Air? YES or NO Any Heat Influence YES or NO Is earth wire connected? YES or NO Refrigeration Piping GOOD or NOT GOOD...
  • Page 308 Field Work Instruction 5.6 Saturation Curve for Refrigerant 580(4.0) R407C R404A R507A R410A 508(3.5) R134a R407E 435(3.0) 363(2.5) 290(2.0) 218(1.5) 145(1.0 73(0.5) 0.0(0.0) REFPROP Ver.5.10 -73(-0.5) (10) (-30) (-20) (-10) (20) (50) (60) (30) (40) Saturation Temperature (Liquid)
  • Page 309 Field Work Instruction 5.7 Pressure-enthalpy Diagram for R410A...
  • Page 310 Test Run 6. Test Run Turn OFF all the power supply 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.
  • Page 311 Test Run 6.1 Test Run by Remote Control Switch Taking HYXE-J01H as an example: (1) Turn ON the power supply for all the indoor units. (2) For the models with the auto-address function, wait for 3 minutes approximately. The addressing is automatically performed.
  • Page 312 Test Run (6) The temperature detections by the thermistors are invalid though the protection devices are valid during the test run. (7) To finish the test run, press “ ” (run/stop) again or pass over the set test run time. When changing the test run time, press “...
  • Page 313 Test Run 6.2 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 supply ON. Setting of Dip Switch (Before Shipment) DSW4 Switch for Setting of Service Operation and Function 1.
  • Page 314 Test Run 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, the frequently. Set DSW4-4 ON. compressor stops to operate immediately and the indoor unit is under the condition of Thermo- OFF.
  • Page 315 Test Run 6.3 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. Initial Voltage If the power supply is abnormal, contact with electric power company.
  • Page 316 Test Run 6.4 Checking List for Refrigerant Cycle The refrigerant cycle data can be checked on 7-segment of outdoor unit PCB during the test run and the troubleshooting. However, it may take time for the checking because the operation cycle changes depending on the operating condition. To check the quality of refrigerant cycle, the following check list shall be used at the test run, troubleshooting and emergency check.
  • Page 317 Test Run (3) Check Item after Sampling Data a . Cooling Operation (It is applicable when outdoor temperature is higher than 59°F(15°C.) Check Item Standard Causes Result • Fan Motor Failure Is fan actually running when • O.U. PCB Failure Fo (Air Flow Rate of O.U.

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