Инструкция на Кондиционеры серии SRK-GZ бренда Mitsubishi Heavy Industries

WALL MOUNTED TYPE ROOM AIR-CONDITIONER Split system, Air to air heat pump type ( ) SRK25GZ-L1, SRK35GZ-L1, SRK502Z-L 1

GENERAL INFORMATION 1.1.1 Specific features The “Mitsubishi Daiya” room air-conditioner: SRK series are of split and wall mounted type and the unit consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or heating equipment…

SELECTION DATA 1.2.1 Specifications Model SRK25GZ-L1 (Indoor unit) SRC25GZ-L1 (Outdoor unit) Model SRK25GZ-L1 Item Refrigerant piping Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current…

Model SRK35GZ-L1 (Indoor unit)

SRC35GZ-L1 (Outdoor unit) Model SRK35GZ-L1 Item Refrigerant piping Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP (Cooling) Noise level Exterior dimensions Height × Width ×…

Model SRK502Z-L (Indoor unit)

SRC502Z-L (Outdoor unit) Model SRK502Z-L Item Refrigerant piping Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP (Cooling) Noise level Exterior dimensions Height × Width × Depth…

Range of usage & limitations (a) Cooling operation Outdoor air temp. ºC D.B. (1) Inlet air temperature Applicable temp. range (b) Heating operation Applicable temp. range Indoor air temp. ºC D.B. JIS-Cooling JIS-Heating Indoor air temp. ºC W.B. Note: The chart is the result from the continuous…

Exterior dimensions (1) Indoor unit Model SRK25GZ-L1 Unit: mm A 178 Room temp. thermistor Piping hole right (left) 236.5 Terminal block 746.9 40 4.5 Remote controller 7.5 62 62 7.5 Piping for Gas (Ø9.52) 370 40 Piping hole (Ø65) 37 Piping for Liquid (Ø6.35) 420 Piping hole (Ø65) VIEW A Model…

Unit: mm

SRK502Z-L Remote controller (2) Outdoor unit Model SRC25GZ-L1 50 Unit: mm 13.5 12 44 274.5 245 42 Drain holes 300 192.5 23 12 372.5 82.5 480 645 82.5 2-Ø12 61.5 Terminal block 33.3 Service valve (Liquid) Flare connecting Ø6.35 (1/4˝) 39.7 540 127.7 100.3 14.4 40˚ 40˚ Service valve (Gas) Flare…

SRC35GZ-L1

50 55 Unit : mm MAX.80 Drain holes 45° 45° 16 12 (Oval holes) for unit fixing 65 2 places Model 413 Terminal block Drain holes 142.5 510 142.5 33 Service Service Valve Valve (Gas) (Liquid) Flare connecting Flare connecting Ø6.35 (1/4¨) Ø12.7 (1/2¨) SRC502Z-L Unit: mm 10

Piping system Model SRK25GZ-L1 Indoor unit Outdoor unit Cooling cycle Heating cycle Flare connecting Piping (Gas) ø9.52 Service valve (Gas) Outdoor air temp. thermistor Check joint 4 way valve Accumulator Room temp. thermistor Discharge temp. thermistor Heat exchanger thermistor Heat exchanger Heat…

SRK502Z-L

1.3 ELECTRICAL DATA 1.3.1 Electrical wiring Meaning of marks Symbol CFI Parts name Capacitor for FMI Symbol RE Parts name Reactor Symbol Tr Parts name Transformer CM Compressor motor SM Flap motor ZNR Varistor F1,2 Fuse Th1 Room temp. thermistor 20S 4 way valve (coil) FMI Fan motor (Indoor) Th2 Heat…

Violet

Light blue

OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Remote control switch Remote control switch Models All models HI POWER operation indicator Indicators during HI POWER operation. FAN SPEED indicator ECONOMY operation indicator Indicators the ¡ for the fan speed which has been set. Indicators during…

RUN (HOT KEEP) lamp (green) TIMER • Illuminates during operation. • Flashing at stop blowing due to the hot keep. RUN TIMER lamp (yellow) Illuminates during TIMER operation. SRK35GZ Model SRK502Z-L RUN (HOT KEEP) lamp (green) TIMER lamp (yellow) Illuminates during TIMER operation. • Illuminates…

(3) Flap control

Control the flap by AIRFLOW button on the wireless remote control. (a) Natural flow (AUTO) The flap will be automatically set to the angle of air flow best to operation. (i) Starting time of operation Models SRK25GZ-L1, 35GZ-L1 In case of heating s operation t In case of cooling s and dry operation…

(4) Comfort timer setting

If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation is selected, the comfort timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the relationship between…

(iii) Continuous mode operation (Temperature setting button on remote controller: Continuous)

Model Item SRK25GZ-L1 AUTO HI Inverter frequency 104Hz Indoor fan 6th speed SRK35GZ-L1 MED LO AUTO 98Hz 50Hz 98Hz 5th speed 4th speed Outdoor fan HI 7th speed ON SRK502Z-L MED LO AUTO 94Hz 58Hz 5th speed 3rd speed ON MED LO 144rps HI 110rps 50rps 8th speed 7th speed 5th speed 5th speed 4th speed 2nd…

(v) Defrosting operation

S Models SRK25GZ-L1, 35GZ-L1 1) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.) ¡ Model SRK25GZ-L1 1 After start of heating operation → When it elapsed 40 minutes. (Accumulated operation time) 2 After end of defrosting operation → When it…

S Model

SRK502Z-L 1) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.) 1 After start of heating operation → When it elapsed 60 minutes. (Accumulated operation time) 2 After end of defrosting operation → When it elapsed 60 minutes. (Accumulated…

(6) Outline of cooling operation

(a) Air capacity selection (i) Frequency of inverter changes within the range of selected air flow. Model SRK25GZ-L1 Air flow selection AUTO Frequency MED LO SRK502Z-L 34~102Hz 18~118rps 34~92Hz Air flow HI SRK35GZ-L1 Depends on frequency. Frequency 34~92Hz 34~102Hz 18~118rps Air flow 5/6th speed…

(i) Cooling oriented dehumidifying S SRK25, 35GZ-L1 Room temperature is checked at 3-minute intervals after selecting the cooling or heating oriented dehumidifying in order to determine the operation range. Operation range D C Low B –1 A 0 +2 Hight Room temperature – Setting temperature (deg)…

(ii) Heating oriented dehumidifying

After interrupting the compressor operation for 3 minutes (by the 3-minute timer) following the determination of heating oriented dehumidifying, the unit enters in the heating operation. If the room temperature exceeds the setting temperature by 2ºC or more, the unit checks the room temperature at…

(9) Economical operation (ECONO button on remote controller: ON)

Pressing the economy button initiates a soft operation with the power suppressed in order to avoid an excessive cooling or heating. The unit operates 1.5ºC higher than the setting temperature for the LO air flow during cooling or 2.5ºC lower than that during heating. (10) Protective control function…

(g) Cooling overload protective control

(i) Operating conditions: When the unit is operating with the outdoor unit frequency other than 0 Hz(rps) or when the outdoor temperature sensor temperature rose beyond 41ºC for 2 minutes continuously. (ii) Detail of operation S SRK25GZ-L1 1) Indoor fan speed is raised forcibly by 1 step. However…

(k)

High pressure control (i) Purpose: Prevents abnormally high pressure operation during heating. (ii) Detector: Indoor unit heat exchanger thermistor (Th2) (iii) Detail of operation: (Example) Fuzzy 8 Hz (8 rps) (1), After lapse of 6 min. or over (3) (4) 8 Hz (8 rps) After lapse of 6 min. or over (3)…

When stopped by indoor unit controller Function Operation Inverter frequency (Command frequency) 0 Indoor fan (Frequency dependent) OFF Indoor power relay ON Outdoor fan 4-way valve Heating, heating oriented dehumidifying Cooling, cooling oriented dehumidifying 3 min.(1) 3 min.(1) When stopped or…

APPLICATION DATA SAFETY PRECAUTIONS ¡ Please read these “Safety Precautions” first then accurately execute the installation work. ¡ Though the precautionary points indicated herein are divided under two headings, WARNING and CAUTION , those points which are related to the strong possibility of an…

Selection of location for installation (1) Indoor unit (a) Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. (b) A solid place where the unit or the wall will not vibrate. (c) A place where there will be enough space for servicing. (Where space 4 cm…

Installation of indoor unit (1) Installation of installation board (a) Fixing of installation board Lock for the inside wall structures (Intermediate support or pillar) and fairly install the unit after level surface has been checked. Adjustment of the installation board in the horizontal direction…

(3) Preparation of indoor unit

(a) Mounting of connecting wires S SRK25, 35GZ-L1 (i) Remove lid (ii) Remove cover, terminal block cover Earth Wiring Terminal Terminal Block Wiring Clamp Connecting Wiring (iii) Insert connecting wire to terminal block securely. 1 Insert connecting wire up to the terminal block securely. If poor…

¡ When arranging the pipe through a hole opened at the center, open the knockout hole using nippers, etc. Chute Wall Note (1) It is designed to collect moisture accumulated on the rear face in the drain pan. Be sure not to accommodate the power cable, etc. above the chute. Pipe accommodation space…

Refrigerant piping (1) Preparation Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them. Outdoor unit side Indoor unit side Dimension A Liquid side (φ6.35): 9-9.5 dia Gas side (φ9.52): 13.2-14 dia (φ12.7): 16.2-17 dia Press (Do not turn) Remove Remove…

(4) Insulation of connecting portion

(a) Cover the connecting portion of the refrigerant piping with the pipe cover and seal them. If neglecting to do so, moisture occurs on the piping and water will drip out. To cover the connecting portion with insulation material materials, cut upper portion and then seal it with insulation…

Precautions for wireless remote controller installation and operation (1) Wireless remote controller covers the following distances: (a) When operating facing the air conditioner: 6 m or le ss or Wireless remote controller 6 m or less or les s or less Notes (1) The remote controller is correctly…

MAINTENANCE DATA 1.6.1 Trouble shooting (1) Trouble shooting to be performed prior to exchanging PCB, (Printed circuit board) [Common to all models] All the models described in this chapter are controlled by a microcomputer. When providing maintenance service to customers it is necessary to…

RUN lamp

2 time flash RUN lamp ON (1) RUN lamp keeps flashing TIMER lamp ON 3 time flash 3 time flash Note (1) SRK502Z-L only 2 time flash 2 time flash 6 time flash 2 time flash 2 time flash 6 time flash 1 time flash 1 time flash 5 time flash OFF 4 time flash 5 time flash OFF 2 time flash 1 time flash OFF…

(3) Inspection procedures corresponding to detail of trouble

[Broken thermistor wire, connector poor connection] Thermistor error Is connector connection good? NO Correct connection. YES NO Is thermistor resistance value good? Replace thermistor. YES Replace PCB. Temperature (˚C) Resistance (kΩ) Temperature (˚C) Resistance (kΩ) 8.7 7.3 6.2 5.3 4.5 3.9 3.3 2.9…

[Broken power transistor

broken compressor wire] Outdoor unit error NO Is output voltage applied to all 3 phases of power transistor? Defective inverter YES NO Is compressor wiring connected securely? Connect securely. YES Inspect compressor. [Overload operation, compressor lock, overcharge] Current safe stop NO Is…

[Wiring error including power cable, defective indoor/

outdoor unit PCB, error on power supply system] Serial signal transmission error Does error persist after power reset? NO Trouble by transient cause, not unit trouble. YES Is there any wrong connection on indoor/outdoor unit wiring? NO Correct improper wire connection on indoor/ outdoor unit. YES Is…

(4) Phenomenon observed after shortcircuit, wire breakage on thermistor

(a) Indoor unit Phenomenon Sensor Operation mode Room temperature thermistor Cooling Release of continuous compressor operation command Continuous compressor operation command is not released. Heating Continuous compressor operation command is not released. Release of continuous compressor operation…

(6) Inspection procedures of indoor electrical equipment

NO Is fuse (3.15A) blown? Replace fuse. YES Is voltage applied between CNC 1~2 at transformer’s secondary side? (Approx. 12V) NO Notes (1) Since the communication timing signal is transmitted only when the 52C is turned ON, check it under the operating condition. (2) Check the voltage on the…

RD

WH NK F(15A) ◆ Inspection of serial signal Check the voltage between terminals 2~3on the terminal block.(It is normal if the needle swing in the range of DC 0~Approx.12V) ◆ Inspection of input to PCB ¡ Check the voltage between terminals 1~2 on the terminal block. (It is normal if AC220/240V is…

RD WH NK F(20A) ◆ Inspection of serial signal Check the voltage between terminals 2~3on the terminal block.(It is normal if the needle swing in the range of DC 0~Approx.12V) ◆ Inspection of input to PCB ¡ Check the voltage between terminals 1~2 on the terminal block. (It is normal if AC220/240V is…

Power source

1 Phase 220/240V 50Hz ● Power source and serial signal inspection 1 to 2: AC220/240V 2 to 3: Normal if the voltage oscillates between DC 0 and approx. 12V 2 3 } CNE EEV CNA 20S CNB S.OUT CNB AC.S GY 52X2-4 Printed circuit board Fuse 250V 25A AC.R BL ~ ~ DS – + WH Re ● Inspection of electronic…

Servicing (1) Evacuation The evacuation is an procedure to purge impurities noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R22 is very insoluble in water, even a small amount of moisture left in the refrigerant equipment will freeze…

Power supply remote operation When the remote part on indoor unit PCB is modified, the air conditioner is turned ON-OFF by power supply ON-OFF operation without using remote control switch. After the power supply remote operation, the operation contents can be modified by the remote controller. AUTO…

WALL MOUNTED TYPE ROOM AIR-CONDITIONER Split system, Air to air heat pump type ( ) SRK328HENF-L2, SRK408HENF-L2 SRK501HENF-L, SRK561HENF-L 51

GENERAL INFORMATION 2.1.1 Specific features The “Mitsubishi Daiya” room air conditioner: SRK series are of split and wall mounted type and the unit consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or heating equipment…

SELECTION DATA 2.2.1 Specifications Model SRK328HENF-L2 (Indoor unit) SRC328HENF-L2 (Outdoor unit) Model SRK328HENF–L2 Item (1) Cooling capacity Heating capacity(1) W W 3000/3000 3800/3800 Cooling input kW 1 Phase, 220/240V, 50Hz 1.39/1.49 Running current (Cooling) Heating input A kW 6.9/6.9…

Model SRK408HENF-L2 (Indoor unit)

SRC408HENF-L2 (Outdoor unit) Model SRK408HENF-L2 Item SRC408HENF-L2 (1) W 3500/3500 Heating capacity(1) Power source W 4100/4100 1 Phase, 220/240V, 50Hz Cooling input Running current (Cooling) kW A 1.320/1.405 6.4/6.4 Heating input Running current (Heating) kW A 1.335/1.460 6.5/6.5 Inrush current…

Model SRK501HENF-L (Indoor unit)

SRC501HENF-L (Outdoor unit) Model SRK501HENF–L Item Cooling capacity(1) Heating capacity(1) W W 4500/4500 5700/5800 Cooling input kW 1 Phase, 220/240V, 50Hz 1.78/1.88 Running current (Cooling) Heating input A kW 8.4/8.2 1.76/1.89 Running current (Heating) Inrush current A A 8.5/8.3 39/42 Power…

Model SRK561HENF-L (Indoor unit)

SRC561HENF-L (Outdoor unit) Model SRK561HENF–L Item Cooling capacity(1) Heating capacity(1) W W 5000/5000 6200/6300 Cooling input kW 1 Phase, 220/240V, 50Hz 2.08/2.18 Running current (Cooling) Heating input A kW 10.2/9.53 2.02/2.15 Running current (Heating) Inrush current A A 10.5/9.95 44/48…

Range of usage & limitations (1) Inlet air temperature (a) Cooling operation (b) Heating operating Applicable temp. range JIS-Cooling Indoor air temp. ºC D. B. Outdoor air temp. ºC D. B. Applicable temp. range JIS-Heating Indoor air temp. ºC W. B. Note: The chart is the result from the continuous…

Exterior dimensions (1) Indoor unit Models SRK328HENF-L2, 408HENF-L2 A Unit: mm Room temp. sensor 56 275 Piping hole right (left) 9 Terminal block 187.5 Piping for Gas (Ø12.7) Piping for Liquid (Ø6.35) 440 Drain hose 600 (Ø16) Piping hole (Ø65) Piping hole (Ø65) VIEW A Models SRK501HENF-L, 561HENF-L…

(2) Outdoor unit

Models SRC328HENF-L2, 408HENF-L2 Unit: mm 55 Drain holes MAX x12 (Oval holes) for unit fixing 2 places Terminal block 45˚ 50 45˚ Drain holes 510 142.5 50 58 142.5 33 14 Service Service valve (Liquid) valve (Gas) Flare fitting Flare fitting Ø6.35 (1/4˝) Ø12.7 (1/2˝) 300 Models SRC501HENF-L, 561HENF-L…

Piping system Model SRK328HENF-L2 Cooling cycle Heating cycle Outdoor unit Indoor unit Service valve (Gas) High pressure switch (63H) (for fan motor control) Flare connecting Piping (Gas) Ø12.7 Heat exchanger Room temperature sensor Heat exchanger sensor Check joint Discharge Compressor Accumulator…

Models

SRK501HENF-L, 561HENF-L Indoor unit Cooling cycle Heating cycle Outdoor unit Service valve (Gas) Flare connecting Piping (Gas) Ø12.7 High pressure switch(63H) (for fan motor control) Check joint 4way valve Room temperature thermistor Heat exchanger thermistor Heat exchanger Discharge Accumulator…

Models SRK501HENF-L, 561HENF-L

OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 2.4.1 Table for operation control Refering page Functions High efficiency, low input rotary compressor Wireless remote control Dry ON TIMER 3 Hot system [Heat Pump type only] (in heating operation) Automatic fan control Micro computer control…

Details of operation control (1) Flap control Control the flap by the flap button on the wireless remote control (a) AUTO (Natural flow) The flap will be automatically set to the angle of air flow best to operation mode 1) Starting time of operation In case of cooling and s dry operation In case of…

(2) Back-up Switch

When the remote controller batteries become weak, or if the remote controller is lost or malfunctioning, this switch may be used to turn the unit on and off. (a) Operation Push the switch once to place the unit in the automatic mode. Push it once more to turn the unit off. (b) Details of operation…

(4) Operation control function by remote control switch

¡ 32, 40 models Remote control switch OPERATION MOOD select button S Operation section Each time the button is pushed, the • indicator is switched over in turn. CONT AUTO HI MED LO FAN SPEED button Each time the button is pushed, the • indicator is switched over in turn. ON/OFF button Press for…

¡ 50, 56 models

The diagram below shows the heat pump type. The cooling only type does not have the items relating to heating. Remote control switch Air flow indicator HI POWER operation indicator Indicaters the selected air flow rate. Indicators during HI POWER operation. ECONOMY operation indicator Indicators…

(a) Comfort timer settings

Temperature is checked beginning 1 hour before the set time, and the power is turned on before the timer setting as necessary to bring the temperature to the proper level by the set time. Operation mode Under 5˚C Operating start time (amount of time previous to set time that operation begins) 60…

(e)

Fan control 1) Fan speed change Mode COOL Fan speed knob HEAT AUTO See below LOW Speed 1 (Speed 1) Speed 2 (Speed 2) Speed 1 (Speed 1) MED Speed 2 (Speed 2) Speed 3 (Speed 3) Speed 2 (Speed 2) HIGH Speed 3 (Speed 4) Speed 4 (Speed 5) Speed 3 (Speed 3) Notes (1) (2) 2) FAN Please refer to page 73…

Function a) The indoor fan motor is controlled in accordance with the temperature of the indoor heat exchanger to send warm air from the start. b) When the air flow increases at heating starting as shown below, the temperature of the indoor heat exchanger become lower since the intake air…

(6) DRY operation

(a) Choose the appropriate operation block area by the difference between room temperature and thermostat setting temperature as shown below. ¡Operation block area D Block C Block B Block A Block –2 0 +3 Room temp. – Setting temp.(deg) (b) Start up operation C.D Block A.B Block Compressor ON and…

(7) Dew condensation prevention control for cooling operation

This prevents dew condensation, in the indoor unit, from occurring. (a) Operating condition: when 52C is kept ON for 30 min. after the unit starts operation. (b) Operation content: forces the indoor fan to change from Speed 1 to Speed 2. (c) Resetting condition: When 52C is off, or when dew…

(10) Forced defrosting (Heat pump type only)

To test forced defrosting in the operation test mode, the unit may be operated once in the forced defrost mode as shown below. S32, 40 models Temporarily turn off the power source and then perform the following operation using the remote controller within 20 seconds after the power is turned back…

(14) High power operation (Remote controller “HI POWER” button on) [50, 56 model only]

The indoor unit fan rotates at speed 4 for 15 minutes, and carries out continuous cooling and heating. (15) Economy operation (Remote controller “ECONO” button on) [50, 56 model only] (a) Cooling economy operation The indoor unit fan operates 2ºC higher than the set temperature at speed 1. (b)…

APPLICATION DATA SAFETY PRECAUTIONS ¡ Please read these “Safety Precautions” first then accurately execute the installation work. ¡ Though the precautionary points indicated herein are divided under two headings, WARNING and CAUTION , those points which are related to the strong possibility of an…

Selection of location for installation (1) Indoor unit (a) Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. (b) A solid place where the unit or the wall will not vibrate. (c) A place where there will be enough space for servicing. (Where Right side…

Installation of indoor unit (1) Installation if installation board (a) Fixing of installation board Lock for the inside wall structures (Intermediate support or pillar) and firmly install the unit after level surface has been checked. Adjustment of the installation board in the horizontal direction…

(3) Preparation of indoor unit

(a) Mounting of connecting wires S 32, 40 models (i) Remove lid. (ii) Remove cover, terminal block cover. (iii) Connect the connection wire securely to the terminal block. 1 Earth Wiring Terminal Connecting Wiring Terminal Block Wiring Clamp Affix the connection wire securely to the terminal block.…

[When the pipe is extended to left and taken out from the rear center]

(Drain pipe relocation procedure) 1. Remove the drain pipe. 2. Remove the drain cap. 3. Insert the drain cap. 4. Connect the drain pipe. ¡ Loosen the spring clamp to ¡ Remove by hand or use ¡ Securely insert the drain cap ¡ Loosen the spring clamp and remove. cutting pliers, etc. removed in the step…

Refrigerant piping (1) Preparation Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them. Indoor unit side Outdoor unit side Remove Remove ¡ Remove the flared nuts. (on both liquid and gas sides) (2) Press Press (Do not turn) Dimension A Liquid side…

Additional refrigerant charge

When refrigerant piping exceeds 7.5m conduct additional refrigerant charge after refrigerant sweeping. Max. 10m Additional charge amount per meter = 20g/m* 10m over 15m Additional charge amount per meter = 30g/m *In case of cooling only unit charge amount is 10g/m [Example for heat pump units] How…

(220/240V)

Model Item High pressure MPa(kgf/cm2) Low pressure MPa(kgf/cm2) Temp. difference between suction air and discharge air (˚C) Running current (A) SRK501HENF-L SRK561HENF-L Cooling – Heating 1.67~1.86 (17 ~ 19) 1.76 ~ 1.96 (18 ~ 20) – Cooling 0.39 ~ 0.49 (4 ~ 5) 0.34 ~0.44 (3.5 ~ 4.5) Heating…

MAINTENANCE DATA 2.6.1 Trouble shooting (1) Trouble shooting to be performed prior to exchanging PCB, (Printed circuit board) [Common to all models] All the models described in this chapter are controlled by a microcomputer. When providing maintenance service to customers it is necessary to…

(2) Indication of Self Diagnosis (Indoor unit)

TIMER lamp is lights continuously. RUN lamp is lights continuously. Connect of Defect Place of defect RUN lamp is flashing. (1 Time flash.) Abnormality of heat exchanger thermistor. ¡ Disconnection of heat exchanger thermistor. RUN lamp is flashing. (2 Time flash.) Abnormality of room temperature…

Anormality of thermistor

Disconnection of thermistor and defective connection of connector Chart for thermistor temperature resistance characteristics Is connection to connector good? No Repair connector. (Disconnection) Is thermistor resistance value normal? No Resistance value Yes Replace thermistor. Yes (kΩ) Replace PCB.…

(5) Trouble shooting chart for the room temperature thermistor (Th1), heat exchanger thermistor (Th2) and defrost thermostat (23DH) Unit Thermistor Function Operation Room temperature thermistor (1) (Th1) except for “continuous” thermal setting. Short circuit Cooling Indoor unit Heating Cooling will…

Servicing (1) Evacuation The evacuation is an procedure to purge impurities noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R407C is very insoluble in water, even a small amount of moisture left in the refrigerant equipment will freeze…

Power supply remote operation When the remote part on indoor unit PCB is modified, the air conditioner is turned ON-OFF by power supply ON-OFF operation without using remote control switch. After the power supply remote operation, the operation contents can be modified by the remote controller. (1)…

S50,56 models

Cut the jumper wire for the “REMOTE” section on the printed circuit board. Carefully position the jumper wire so that it does not come in contact with other parts. CNG CNE REMOTE CUSTOM CNH 23D 52C 20S CNU (FMI) FUSE1 (250V3, 15A) 52X1 CNM 91

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