Carrier 38NYV025M Service Manual
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Carrier 38NYV025M Service Manual

Air-conditioner split wall type
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FILE NO. SVM-07009
SERVICE MANUAL
AIR-CONDITIONER
SPLIT WALL TYPE
42NQV025M / 38NYV025M
42NQV025M-A / 38NYV025M-A
March, 2007

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Summary of Contents for Carrier 38NYV025M

  • Page 1 FILE NO. SVM-07009 SERVICE MANUAL AIR-CONDITIONER SPLIT WALL TYPE 42NQV025M / 38NYV025M 42NQV025M-A / 38NYV025M-A March, 2007...

  • Page 2: Table Of Contents

    FILE NO. SVM-07009 CONTENTS 1. SAFETY PRECAUTIONS ................3 2. SPECIFICATIONS ..................5 3. REFRIGERANT R410A ................7 4. CONSTRUCTION VIEWS ................ 15 5. WIRING DIAGRAM .................. 18 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 20 7. REFRIGERANT CYCLE DIAGRAM ............21 8.

  • Page 3: Safety Precautions

    FILE NO. SVM-07009 1. SAFETY PRECAUTIONS For general public use Power supply cord of outdoor unit shall be more than 1.5 mm (H07RN-F or 60245IEC66) polychloroprene sheathed flexible cord. • Read this “SAFETY PRECAUTIONS” carefully before servicing. • The precautions described below include the important items regarding safety. Observe them without fail. •...
  • Page 4 FILE NO. SVM-07009 • DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS. FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION. • TO PREVENT THE INDOOR UNIT FROM OVERHEATING AND CAUSING A FIRE HAZARD, PLACE THE UNIT WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEAT REGISTORS, FURNACE, STOVES, ETC.

  • Page 5: Specifications

    FILE NO. SVM-07009 1. SPECIFICATIONS 1-1. Specifications 42NQV025M, 42NQV025M-A Unit model Indoor 38NYV025M, 38NYV025M-A Outdoor Cooling capacity (kW) 1.1 - 2.9 Cooling capacity range (kW) Heating capacity (kW) Heating capacity range (kW) 0.9 - 4.0 Power supply 1Ph/50Hz/220-240V Cooling Heating...

  • Page 6: Operation Characteristic Curve

    FILE NO. SVM-07009 2-2. Operation Characteristic Curve 42NQV025M, 42NQV025M-A <Cooling> <Heating> Conditions Conditions Indoor : DB 27 C/WB 19 Indoor : DB 20 Outdoor : DB 35 Outdoor : DB 7 C/WB 6 Air Flow : High Air Flow : High...

  • Page 7: Refrigerant R410A

    FILE NO. SVM-07009 3. REFRIGERANT R410A This air conditioner adopts the new refrigerant HFC 6. When an air conditioning system charged with a (R410A) which does not damage the ozone layer. large volume of refrigerant is installed in a small room, it is necessary to exercise care so that, The working pressure of the new refrigerant R410A even when refrigerant leaks, its concentration...
  • Page 8 FILE NO. SVM-07009 Table 3-2-1 Thicknesses of annealed copper pipes Thickness (mm) Nominal diameter Outer diameter (mm) R410A 6.35 0.80 0.80 9.52 0.80 0.80 12.70 0.80 0.80 15.88 1.00 1.00 2. Joints For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants. a) Flare Joints Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm.
  • Page 9 FILE NO. SVM-07009 d) Flare Processing Make certain that a clamp bar and copper pipe have been cleaned. ØD By means of the clamp bar, perform the flare processing correctly. Use either a flare tool for R410A or conven- tional flare tool. Flare processing dimensions differ according to the type of flare tool.
  • Page 10 FILE NO. SVM-07009 Table 3-2-6 Flare and flare nut dimensions for R22 Dimension (mm) Nominal Outer diameter Thickness Flare nut width diameter (mm) (mm) (mm) 6.35 9.52 13.0 13.5 12.70 16.2 16.0 12.9 15.88 19.7 19.0 16.0 19.05 23.3 24.0 19.2 Fig.
  • Page 11 FILE NO. SVM-07009 3-3. Tools 3-3-1. Required Tools The service port diameter of packed valve of the outdoor unit in the air-water heat pump using R410A is changed to prevent mixing of other refrigerant. To reinforce the pressure-resisting strength, flare processing dimensions and opposite side dimension of flare nut (For Ø12.7 copper pipe) of the refrigerant piping are lengthened.

  • Page 12: Recharging Of Refrigerant

    FILE NO. SVM-07009 3-4. Recharging of Refrigerant When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following steps. Recover the refrigerant, and check no refrigerant remains in the equipment. When the compound gauge’s pointer has indicated –0.1 Mpa (–76 cmHg), place the handle Low in the fully closed position, and turn off the vacuum pump’s power switch.

  • Page 13: Brazing Of Pipes

    FILE NO. SVM-07009 1. Be sure to make setting so that liquid can be charged. 2. When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down. It is necessary for charging refrigerant under condition of liquid because R410A is mixed type of refrigerant. Accordingly, when charging refrigerant from the refrigerant cylinder to the equipment, charge it turning the cylinder upside down if cylinder is not equipped with siphon.
  • Page 14 FILE NO. SVM-07009 2. Characteristics required for flux 3-5-3. Brazing • Activated temperature of flux coincides with the As brazing work requires sophisticated techniques, brazing temperature. experiences based upon a theoretical knowledge, it must be performed by a person qualified. •...

  • Page 15: Construction Views

    FILE NO. SVM-07009 4. CONSTRUCTION VIEWS 4-1. Indoor Unit Air filter Front panel Air inlet Heat exchanger Air outlet Knock out system 60 55 Connecting pipe (0.37m) (Flare 6.35) Drain hose (0.5m) Connecting pipe (0.32m) Hanger (Flare 9.52) For stud bold ( For stud bold ( Hanger Wireless remote control...
  • Page 16 FILE NO. SVM-07009 4-2. Outdoor Unit − 16 −...

  • Page 17: Wiring Diagram

    FILE NO. SVM-07009 5. WIRING DIAGRAM 5-1. Indoor Unit – 17 –...
  • Page 18 FILE NO. SVM-07009 – 18 –...

  • Page 19: Specifications Of Electrical Parts

    FILE NO. SVM-07009 6. SPECIFICATION OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type Specifications AC Motor with 145°C thermo fuse Fan motor AFS-220-20-4AR DC Motor Over Heat protection circuit Thermo. sensor (TA-sensor) 10 kΩ at 25°C Micro power module (T101) µRM1260V Micro controller unit (IC81) µPD780076GK-703-9ET-A...

  • Page 20: Refrigerant Cycle Diagram

    FILE NO. SVM-07009 7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram 42NQV025M / 38NYV025M 42NQV025M-A / 38NYV025M-A Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 10m Min. : 1m Pressure measurement Deoxidized copper pipe Chargeless : 10m Gauge attaching port Outer dia.
  • Page 21 Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 9 to 11 47 to 49 42NQV025M 27/19 35/- 0.9 to 1.1 High High 9 to 11 47 to 49 42NQV025M-A 0.9 to 1.1 High High <Heating>...

  • Page 22: Control Block Diagram

    FILE NO. SVM-07009 8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit Indoor Unit Control Panel M.C.U. Functions Operation Heat Exchanger Sensor • Louver Control Display Timer • 3-minute Delay at Restart for Compressor Temperature Sensor Display • Motor Revolution Control Infrared Rays Signal Receiver •...
  • Page 23 FILE NO. SVM-07009 8-2. Outdoor Unit (38NYV025M, 38NYV025M-A) – 23 –...

  • Page 24: Operation Description

    FILE NO. SVM-07009 9. OPERATION DESCRIPTION • Detection of inverter input current and current 9-1. Outline of Air Conditioner Control release operation This air conditioner is a capacity-variable type air • Over-current detection and prevention operation conditioner, which uses AC motor both the indoor to IGBT module (Compressor stop function) fan motor and the outdoor fan motor.
  • Page 25 FILE NO. SVM-07009 9-2. Operation Description 1. Basic operation ......................26 1. Operation control ....................26 2. Cooling/Heating operation ..................27 3. AUTO operation ..................... 27 4. DRY operation ......................27 2. Indoor fan motor control ..................... 28 3. Capacity control ......................30 4.

  • Page 26: Operation Description

    FILE NO. SVM-07009 9-2. Operation Description Item Operation flow and applicable data, etc. Description 1. Basic 1. Operation control operation Receiving the user’s operation condition setup, the operation statuses of indoor/outdoor units are controlled. 1) The operation conditions are selected by the remote controller as shown in the below. 2) A signal is sent by ON button of the remote controller.

  • Page 27: Cooling/Heating Operation

    FILE NO. SVM-07009 Item Operation flow and applicable data, etc. Description 1. Basic 2. Cooling/Heating operation operation The operations are performed in the following parts by controls according to cooling/heating conditions. 1) Receiving the operation ON signal of the remote controller, the cooling or heating operation signal starts being transferred form the indoor controller to the outdoor unit.

  • Page 28: Indoor Fan Motor Control

    *5 : Fan speed = (M + –L) x 1/4 + L +0.5 (Linear approximation L(W6) from M+ and L) (Table 1) Indoor fan and air flow rate Fan speed 42NQV025M level COOL HEAT DRY 42NQV025M-A Fan speed Air flow rate (rpm)
  • Page 29 FILE NO. SVM-07009 Item Operation flow and applicable data, etc. Description 2. Indoor fan <In heating operation> 1) When setting the fan speed to L, motor control L+, M, M+ or H on the remote controller, the operation is per- formed with the constant speed HEAT ON shown in Fig.

  • Page 30: Capacity Control

    Current decrease which does not exceed the specified value. Capacity control continues. Outdoor temp. Cooling current release value Heating current release value 42NQV025M 42NQV025M 42NQV025M-A 42NQV025M-A 45°C 3.60A 7.72A 40°C 44°C 5.17A...

  • Page 31: Release Protective Control By Temperature Of Indoor Heat Exchanger

    FILE NO. SVM-07009 Item Operation flow and applicable data, etc. Description 5. Release protective <In cooling/dry operation> 1) When temperature of the indoor control by tempera- heat exchanger drops below 5°C, (Prevent-freezing control for indoor heat exchanger) ture of indoor heat the compressor speed is In cooling/dry operation, the sensor of indoor heat exchanger...

  • Page 32: Defrost Control (Only In Heating Operation)

    FILE NO. SVM-07009 Item Operation flow and applicable data, etc. Description 6. Defrost control (This function removes frost adhered to the outdoor The necessity of defrost operation is (Only in heating heat exchanger.) detected by the outdoor heat exchanger operation) temperature.

  • Page 33: Louver Control

    FILE NO. SVM-07009 Item Operation flow and applicable data, etc. Description 7. Louver control This function controls the air direction of the indoor unit. • The position is automatically controlled according to the operation 1) Louver mode (COOL/HEAT). position • The set louver position is stored in memory by the microcomputer, and the louver returns to the stored position when the next operation is performed.

  • Page 34: Eco Operation

    * 10 (DRY max - COOL min) /6 x 3 + COOL min * 9 (DRY max - COOL min) /6 x 2 + COOL min * 8 (DRY max - COOL min) /6 x 1 + COOL min 42NQV025M, 42NQV025M-A Cool min Dry max <Heating operation>...

  • Page 35: Temporary Operation

    FILE NO. SVM-07009 Item Operation flow and applicable data, etc. Description 9. Temporary Pressing [RESET] button starts the temporary opera- 1) When pressing [RESET] button, the operation tion of [AUTO] operation. When keeping [RESET] temporary [AUTO] operation starts. button pressed for 10 seconds or more, the temporary 2) When keeping [RESET] button pressed [COOL] operation is performed.

  • Page 36: Remote-A Or B Selection

    FILE NO. SVM-07009 Item Operation flow and applicable data, etc. Description 11. Romote-A or B Setting the remote controller 1. Purpose selection To separate using of remote control for each indoor This operation is to operate only one unit in case of 2 air conditioner are installed nearly. indoor unit using one remote controller.

  • Page 37: Hi-Power Mode

    FILE NO. SVM-07009 Item Operation flow and applicable data, etc. Description 12. Hi-POWER ([Hi-POWER] button on the remote controller Mode is pressed) When [Hi-POWER] button is pressed while the indoor unit is in Auto, Cooling or Heating operation, Hi- POWER mark is indicated on the display of the remote controller and the unit operates as follows.

  • Page 38: Auto Restart Function

    FILE NO. SVM-07009 9-3. Auto Restart Function This indoor unit is equipped with an automatic restarting function which allows the unit to restart operating with the set operating conditions in the event of a power supply being accidentally shut down. The operation will resume without warning three minutes after power is restored.

  • Page 39: How To Cancel The Auto Restart Function

    FILE NO. SVM-07009 9-3-2. How to Cancel the Auto Restart Function To cancel auto restart function, proceed as follows : Repeat the setting procedure : the unit receives the signal and beeps three times. The unit will be required to be turned on with the remote controller after the main power supply is turned off. •...

  • Page 40: Remote Control

    FILE NO. SVM-07009 9-4. Remote control 9-4-1. Remote control and its functions Infrared signal emitter Start/Stop button ( Mode select button ( Temperature button ( Fan speed button ( Swing louver button ( Set louver button ( On timer button ( Off timer button ( OF F Sleep timer button (...
  • Page 41 FILE NO. SVM-07009 5. ECO OPERATION To automatically control room to save energy (except in DRY and FAN ONLY mode) Press : Start and stop the operation. Note: Cooling operation; the set temperature will increase automatically 1 degree/ hour for 2 hours (maximum 2 degrees increase). For heating operation the set temperature will decrease.
  • Page 42 FILE NO. SVM-07009 9. AUTO RESTART OPERATION To automatically restart the conditioner after the power failure (Power of the unit must be on.) Setting 1. Press and hold the RESET button on the indoor unit for 3 seconds to set the operation.

  • Page 43: Name And Functions Of Indications On Remote Controller

    FILE NO. SVM-07009 9-4-3. Name and Functions of Indications on Remote Controller [Display] All indications, except for the clock time indicator, are displayed by pressing the button. Transmission mark Hi-POWER indicator This transmission mark indicates when the Indicates when the Hi-POWER operation starts. remote controller transmits signals to the indoor Press the Hi-POWER button to start and press it unit.
  • Page 44 FILE NO. SVM-07009 9-5. Hi-POWER Mode ([Hi-POWER] button on the remote controller is pressed) When [Hi-POWER] button is pressed while the indoor unit is in Auto, Cooling or Heating operation, Hi-POWER mark is indicated on the display of the remote controller and the unit operates as follows. 1.

  • Page 45: Installation Procedure

    FILE NO. SVM-07009 10. INSTALLATION PROCEDURE 10-1-1. Installation Diagram of Indoor and Outdoor Units For the rear left and left piping Hook Installation plate Wall Insert the cushion between the indoor unit and wall, and tilt the indoor unit for better operation.
  • Page 46 FILE NO. SVM-07009 10-1-2. Optional installation parts Part Parts name Q'ty Code Refrigerant piping Liquid side : ∅6.35 mm each Gas side ∅ 9.52 mm Pipe insulating material (polyethylene foam, 6 mm thick) Putty, PVC tapes each <Fixing bolt arrangement of outdoor unit> 500 mm Air inlet 97 mm...
  • Page 47 FILE NO. SVM-07009 10-1-3. Accessory and installation parts Part Part Part Part name (Q’ty) Part name (Q’ty) Part name (Q’ty) Mounting screw ∅4 x 25 s x 6 Installation plate x 1 Remote control holder x 1 Pan head wood screw ∅3.1 x 16 s x 2 Wireless remote control x 1 Nano-Silver Ginseng filter x 1...
  • Page 48 FILE NO. SVM-07009 10-1-4. Installation/Servicing Tools <Changes in the product and components> In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being charged accidentally, the service port diameter of the outdoor unit control valve (3 way valve) has been changed. (1/2 UNF 20 threads per inch) •...

  • Page 49: Indoor Unit

    FILE NO. SVM-07009 10-2-2. Cutting a hole and mounting installation 10-2. Indoor Unit plate 10-2-1. Installation place <Cutting a hole> • A place which provides the spaces around the When installing the refrigerant pipes from the rear. indoor unit as shown in the above diagram. •...
  • Page 50 FILE NO. SVM-07009 <When the installation plate is directly mounted on 9-2-3. Electrical work the wall> 1. The supply voltage must be the same as the rated 1. Securely fit the installation plate onto the wall by voltage of the air conditioner. screwing it in the upper and lower parts to hook up 2.
  • Page 51 FILE NO. SVM-07009 10-2-4. Wiring connection 10-2-5. Piping and drain hose installation <How to connect the connecting cable> <Piping and Drain Hose Forming> Wiring of the connecting cable can be carried out * Since dewing results in a machine trouble, make without removing of the front panel.
  • Page 52 FILE NO. SVM-07009 <How to fix the Drains Cap> <Left-hand connection with piping> 1) Insert hexagonal wrench (∅4 mm) in a center head. Bend the connecting pipe so that it is laid within 43 mm above the wall surface. If the connecting pipe is laid exceeding 43 mm above the wall surface, the indoor unit may unstably be set on the wall.
  • Page 53 FILE NO. SVM-07009 10-2-6. Indoor unit fixing 2. Put water in the drain pan and make sure that the water is drained out of doors. 1. Pass the pipe through the hole in the wall, and hook 3. When connecting extension drain hose, insulate the the indoor unit on the installation plate at the upper connecting part of extension drain hose with shield hooks.

  • Page 54: Outdoor Unit

    FILE NO. SVM-07009 10-3-2. Refrigerant piping connection 10-3. Outdoor Unit <Flaring> 10-3-1. Installation place 1. Cut the pipe with a pipe cutter. • A place which provides the spaces around the outdoor unit as shown in the left diagram. • A place which can bear the weight of the outdoor Roughness Obliquity Warp...
  • Page 55 FILE NO. SVM-07009 10-3-3. Evacuating (Unit : N•m) After the piping has been connected to the indoor unit, Outer dia. Tightening torque you can perform the air purge together at once. of copper pipe AIR PURGE ∅6.35 mm 16 to 18 (1.6 to 1.8 kgf·m) Evacuate the air in the connecting pipes and in the ∅...
  • Page 56 (0.9 to 1.0 kgf·m) Earth line Earth line Hexagonal wrench is required. Power cord Connecting cable Fig. 10-3-8 Model 42NQV025M, 42NQV025M-A Power source 50 Hz, 220 - 240 V~ Single phase Fig. 10-3-8 Maximum running current 10-3-4. Wiring connection Installation fuse rating 1.
  • Page 57 FILE NO. SVM-07009 10-3-5. Gas leak test 10-3-8. Remote Controller Selector Switch Check places for indoor unit (Flare Setting nut connection) When two indoor units are installed in the separated rooms, Valve cover it is not necessary to change the selector switches. Remote control selector switch •...

  • Page 58: How To Diagnose The Trouble

    FILE NO. SVM-07009 11. HOW TO DIAGNOSE THE TROUBLE The pulse modulating circuits are mounted to both NOTE: indoor and outdoor units. Therefore, diagnose troubles A large-capacity electrolytic capacitor is used in the according to the diagnosis procedure as described outdoor unit controller (inverter).

  • Page 59: Primary Judgement

    FILE NO. SVM-07009 11-1-3. Operation which is not a trouble (Program operation) For controlling the air conditioner, the program operations are built in the microcomputer as described in the following table. If a claim is made for running operation, check whether or not it meets to the contents in the following table.

  • Page 60: Judgment By Flashing Led Of Indoor Unit

    FILE NO. SVM-07009 11-3. Judgment by Flashing LED of Indoor Unit While the indoor unit monitors the operation status of the air conditioner, if the protective circuit operates, the contents of self-diagnosis are displayed with block on the indoor unit indication section. Table 11-3-1 Check Item...
  • Page 61 FILE NO. SVM-07009 11-4. Self-Diagnosis by Remote Controller (Check Code) 1. If the lamps are indicated as shown B to E in Table 11-3-1, execute the self-diagnosis by the remote controller. 2. When the remote controller is set to the service mode, the indoor controller diagnoses the operation condi- tion and indicates the information of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 62 FILE NO. SVM-07009 11-4-2. Caution at servicing (1) After servicing, push the [ ] button to return to the normal mode. (2) After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power supply again so that memory in the microcomputer returns the initial status.
  • Page 63 FILE NO. SVM-07009 Block distinction Operation of diagnosis function Judgement and action Check Check Air conditioner Block Cause of operation Remark code code status Outdoor Inverter over-current All off Displayed when Even if trying operation again, all P.C. board protective circuit operates. error is detected.

  • Page 64: Judgement Of Trouble By Every Symptom

    FILE NO. SVM-07009 11-5. Judgement of Trouble by Every Symptom 11-5-1. Indoor unit (Including remote controller) (1) Power is not turned on (Does not operate entirely) Turn off power Operation supply once, and 5 second later, turn it Check item on again.
  • Page 65 FILE NO. SVM-07009 (2) Power is not turned on though Indoor P.C. board is replaced <Confirmation procedure> Turn on power supply. Is wired correctly to white and black Correct wiring. Does operation lamp flash? lead wires of terminal board? To item of “Power is not turned on”.
  • Page 66 FILE NO. SVM-07009 (3) Only the indoor fan does not operate. <Check procedure> Shut off the power supply once. Turn the power supply. Does the fan stop in Control P.C. board is defective. Replace the P.C. board. no operating status? Start the operation with low fan setting in cool operation.
  • Page 67 FILE NO. SVM-07009 (4) Troubleshooting for remote control The unit does not beep at all. Press [ OPERATION lamp on indoor button. unit is not indicated. Is transmission mark indicated? Press RESET button on remote control with tip of pencil. Is receiver on indoor unit exposed to direct sunlight?
  • Page 68 FILE NO. SVM-07009 11-5-2. Wiring Failure (Interconnected and serial signal wire) (1) Outdoor unit does not operate. 1) Is the voltage between 2 and 3 of the indoor terminal block varied? Confirm that transmission from indoor to outdoor is correctly performed based on the following diagram. NOTE: •...
  • Page 69 FILE NO. SVM-07009 11-6. Check Code 1C (Miswiring in indoor/outdoor units) and 1E <Check procedure> Operation Check item Gas leakage, disconnection of Discharge temp. TS/TC sensors (Check code error, gas leakage Conceivable principle 02, 1C) (Check code 03, 1E) cause Measure Item by symptoms Valve drive check...
  • Page 70 FILE NO. SVM-07009 Diagnosis/Process flowchart Item Contents Summary → OK if 10MΩ or more Check Check winding resistance → OK if 0.51Ω → between phases of compressor, and 0.57Ω (Check by a resistance between digital tester.) outdoor frames by using a Check tester.
  • Page 71 FILE NO. SVM-07009 (3) Checking procedure. Table 11-6-1 Causes Procedure Check Point (Symptom) Shut off the power supply and 1. Is the fuse blown? 1. Application of shock voltage. remove the P.C. board assembly Overload by short-circuit of the from the electronic parts base. parts.

  • Page 72: How To Diagnose Trouble In Outdoor Unit

    FILE NO. SVM-07009 11-7. How to Diagnose Trouble in Outdoor Unit 11-7-1. Summarized inner diagnosis of inverter assembly Diagnosis/Process flowchart Item Contents Summary Preparation Turn “OFF” the power Remove breaker, and remove 3P connector of compressor. connector which connects inverter and compressor. •...
  • Page 73 FILE NO. SVM-07009 11-8-2. P.C. board layout Sensor characteristic table TD : Discharge temp. sensor TA : Room Temperature sensor TC : Heat exchanger temp. sensor TO : Outdoor temp. sensor TA, TC, TO, TE TE : Outdoor heat exchanger temp. sensor Temperature (°C) –...
  • Page 74 FILE NO. SVM-07009 11-8-3. Indoor unit (Other parts) Part name Checking procedure Room temp. (TA) sensor Disconnect the connector and measure the resistance value with Heat exchanger (TC) sensor tester. (Normal temp.) Temperature 10°C 20°C 25°C 30°C 40°C Sensor 20.7 12.6 10.0 TA, TC (kΩ)
  • Page 75 FILE NO. SVM-07009 11-8-6. Checking method for each part Part name Checking procedure Electrolytic capacitor (For 1. Turn OFF the power supply breaker. raising pressure, smoothing) 2. Discharge all four capacitors completely. 3. Check that safety valve at the bottom of capacitor is not broken. 4.

  • Page 76: How To Simply Judge Whether Outdoor Fan Motor Is Good Or Bad

    FILE NO. SVM-07009 11-9. How to Simply Judge Whether Outdoor Fan Motor is Good or Bad 1. Symptom • Outdoor fan motor does not rotate. • Outdoor fan motor stops within several ten seconds though it starts rotating. • Outdoor fan motor rotates or does not rotate according to the position where the fan stopped., etc. 2.

  • Page 77: Part Replacement

    FILE NO. SVM-07009 12. PART REPLACEMENT 12-1. Indoor Unit Part name Procedures Remarks Front panel How to remove the front panel 1) Stop the operation of the air conditioner and turn off its main power supply. 2) Pull the air inlet grille toward you to open it and remove the air inlet grille.
  • Page 78 FILE NO. SVM-07009 Part name Procedures Remarks Heat exchanger 1) Remove the front panel, electrical part and the horizontal louver following procedure 3. 2) Remove the pipe holder at the rear side of main unit. 3) Remove the 2 screws on the heat exchanger at the base bearing.
  • Page 79 FILE NO. SVM-07009 12-2. Microcomputer Part name Procedures Remarks Common 1) Turn the power supply off to stop the operation Replace the thermal fuse, terminal procedure of air conditioner. block, microcomputer ass’y and the 2) Remove the front panel. P.C. board ass’y •...
  • Page 80 FILE NO. SVM-07009 <P.C. board layout> Solder side – 80 –...
  • Page 81 FILE NO. SVM-07009 12-3-1. Outdoor Unit Part name Procedures Remarks Common 1. Detachment Upper cabinet procedure 1) Stop operation of the air conditioner, and turn off the main switch and breaker of the Wiring cover air conditioner. 2) Remove the valve cover. (ST1T∅4 x 10s Valve cover 1 pc) •...
  • Page 82 FILE NO. SVM-07009 Part name Procedures Remarks 1) Perform work of item 1 of 1. Inverter Inverter cover assembly 2) Remove screw (ST1T∅4 x 10s 1 pc.) of PC board the upper part of the front cabinet. (Soldered surface) • If removing the inverter cover in this condition, the P.C.
  • Page 83 FILE NO. SVM-07009 Part name Procedures Remarks Control board 1) Disconnect lead wires and connectors CN602 CN601 assembly connected from the control board CN300 CN701 assembly to other parts. CN500 1. Lead wires • Connection with terminal block : 3 wires (Black, White, Orange) •...
  • Page 84 FILE NO. SVM-07009 Part name Procedures Remarks ƒ 1) Perform work of item 1 of 1 and 1 of 2. Fan motor 2) Remove the flange nut fixing the fan motor Fan motor and the propeller fan. Propeller fan • Flange nut is loosened by turning clockwise.
  • Page 85 FILE NO. SVM-07009 Part name Procedures Remarks † Fan guard 1. Detachment 1) Perform work of item 1 of 1 and 1 of 2. Requirement: Perform the work on a corrugated cardboard, cloth, etc. to prevent scratches to the product. 2) Remove the front cabinet, and place it down so that the fan guard side faces downwards.
  • Page 86 FILE NO. SVM-07009 Part name Procedures Remarks Replacement of 1) Cut the sensor 100 mm longer than old Cutting here Thermal temperature one. sensor part Connector sensor for 2) Cut the protective tube after pulling out it servicing only (200 mm). 3) Move the protective tube toward the Cutting here Common service...

  • Page 87: Exploded Views And Parts List

    FILE NO. SVM 07009 13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit (E-Parts Assy) Location Part Location Part Description Description 43T60365 TERMINAL BLOCK; 3P 43T69612 PC BOARD ASSY ;WRS-LED 43T69319 TEMPERATURE SENSOR 43T62003 CORD CLAMP 43T69320 TEMPERATURE SENSOR 43T69629 ASM-PCB-SERV −...

  • Page 88: File No. Svm

    FILE NO. SVM-07009 13-2. Indoor Unit Electric Parts Assembly Location Part Location Part Description Description 43T00479 FRONT PANEL ASSY 43T19333 FIX-PIPE-SENSOR 43T09405 GRILLE OF AIR INLET (ORIGINAL) 43T22312 ASM-BEAR-MOLD GRILLE OF AIR INLET 43T09407 43T39323 BEARING BASE (OPTIONAL;GRAY) 43T03357 BACK BODY ASSY 43T20323 ASSY CROSS FLOW FAN 43T80317...
  • Page 89 FILE NO. SVM-07009 13-3. Outdoor Unit (38NYV025M, 38NYV025M-A) Location Part Location Part Description Description 43T19334 FAN GUARD 43T49327 CUSHION,RUBBER 43T20324 PROPELLER FAN 43T50316 BIMETAL THERMO 43T00482 FRONT CABINET 43T41358 COMPRESSOR(Made in China) 43T43403 CONDENSOR ASSEMBLY 43T19337 PACKED VALVE COVER 43T62323 TERMINAL COVER 43T00481 UPPER CABINET...
  • Page 90 FILE NO. SVM-07009 13-4. Outdoor Unit (E-Parts Assy) Location Part Location Part Description Description 43T62320 HEATSINK 43T60377 TEMPERATURE SENSOR 43T69620 ASM-PCB-SERV 43T50304 SENSOR;HEAT EXCHANGER 43T60352 TERMINAL BLOCK; 6P 43T62313 BASE-PLATE-PC 43T60326 FUSE 43T55325 CAPACITOR; PLASTIC-FILM − 90 −...
  • Page 91 FILE NO. SVM-03008 – 87 –...

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