Carrier 42NQV050M Service Manual
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Carrier 42NQV050M Service Manual

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SERVICE MANUAL
Indoor Unit
<High Wall, Heat Pump Type>
42NQV050M
42NQV060M
42NQV050M-N
42NQV060M-N
42NQV050M-A
42NQV060M-A
Outdoor Unit
<Heat Pump Type>
38NYV050M2
38NYV060M2
38NYV050M-A
38NYV060M-A
R410A
FILE NO. SVM-10052-3
SPLIT TYPE
Revised May, 2011

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Summary of Contents for Carrier 42NQV050M

  • Page 1 FILE NO. SVM-10052-3 SERVICE MANUAL SPLIT TYPE Indoor Unit <High Wall, Heat Pump Type> 42NQV050M 42NQV060M 42NQV050M-N 42NQV060M-N 42NQV050M-A 42NQV060M-A Outdoor Unit <Heat Pump Type> 38NYV050M2 38NYV060M2 38NYV050M-A 38NYV060M-A R410A Revised May, 2011...

  • Page 2: Table Of Contents

    FILE NO. SVM-10052 CONTENTS 1. SAFETY PRECAUTIONS ................2 2. SPECIFICATIONS ..................4 3. REFRIGERANT R410A ................8 4. CONSTRUCTION VIEWS ................ 16 5. WIRING DIAGRAM .................. 18 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 19 7. REFRIGERANT CYCLE DIAGRAM ............20 8.

  • Page 3: Safety Precautions

    1. SAFETY PRECAUTIONS FILE NO. SVM-10052 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-10052 • 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-10052 2. SPECIFICATIONS 2-1. Specifications 42NQV050M / 38NYV050M2 42NQV060M / 38NYV060M2 42NQV050M 42NQV060M Unit model Indoor Outdoor 38NYV050M2 38NYV060M2 Cooling capacity (kW) 1.1-6.0 1.2-6.7 Cooling capacity range (kW) Heating capacity (kW) Heating capacity range (kW) 0.8-6.3 1.0-7.5 1Ph/50Hz/220-240V, 1Ph/60Hz/220-230V...
  • Page 6 FILE NO. SVM-10052 42NQV050M-N / 38NYV050M2 42NQV060M-N / 38NYV060M2 42NQV050M-N 42NQV060M-N Unit model Indoor 38NYV050M2 38NYV060M2 Outdoor Cooling capacity (kW) 1.1-6.0 1.2-6.7 Cooling capacity range (kW) Heating capacity (kW) 0.8-6.3 1.0-7.5 Heating capacity range (kW) Power supply 1Ph/50Hz/220-240V, 1Ph/60Hz/220-230V Electric...
  • Page 7 FILE NO. SVM-10052-1 42NQV050M-A / 38NYV050M-A 42NQV060M-A / 38NYV060M-A 42NQV050M-A 42NQV060M-A Unit model Indoor 38NYV050M-A 38NYV060M-A Outdoor Cooling capacity (kW) Cooling capacity range (kW) 1.1-6.0 1.2-6.7 Heating capacity (kW) 0.8-6.3 1.0-7.5 Heating capacity range (kW) Power supply 1Ph/50Hz/220-240V Electric Indoor...
  • Page 8 Indoor Air-Flow Volume: High Pipe Length: 7.5m Pipe Length: 7.5m Capacity Ratio: 100%= Capacity Ratio: 100%= 5.0kW (42NQV050M,42NQV050M-N,42NQV050M-A) 5.8kW (42NQV050M,42NQV050M-N,42NQV050M-A) 6.0kW (42NQV060M,42NQV060M-N,42NQV060M-A) 7.0kW (42NQV060M,42NQV060M-N,42NQV060M-A) 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Outdoor Temperature ( Outdoor Temperature ( –...

  • Page 9: Refrigerant R410A

    FILE NO. SVM-10052 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 10 FILE NO. SVM-10052 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 11 FILE NO. SVM-10052 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 12 FILE NO. SVM-10052 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 16.0 16.2 12.9 15.88 19.0 19.7 16.0 19.05 23.3 24.0 19.2 Fig.
  • Page 13 FILE NO. SVM-10052 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 14 FILE NO. SVM-10052 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 15 FILE NO. SVM-10052 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 16 FILE NO. SVM-10052 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 17: Construction Views

    4.CONSTRUCTION VIEWS FILE NO. SVM-10052 4-1. Indoor Unit 42NQV050M,42NQV060M 42NQV050M-N,42NQV060M-N 42NQV050M-A,42NQV060M-A Wireless remote controller Remote controller holder − −...
  • Page 18 FILE NO. SVM-10052 4.2 Outdoor Unit Ø6 hole R5.5 Ø6 hole Ø11x14 hole A detail Drawing (Back leg) Ø 11 x 14 Hole Ø 25 Drain outlet B Detail Drawing (Front leg) (For 8 - 10 anchor bolt) Ø Ø FAN-GUARD Ø...

  • Page 19: Wiring Diagram

    R219 (SUCTION PIPE AC250V TEMP. SENSOR) CN602 POWER RELAY (OUTDOOR TEMP. SENSOR) CN601 (DISCHARGE PIPE RELAY TEMP. SENSOR) CN600 (CONDENSER PIPE TEMP. SENSOR) COIL 4WAY VALVE 220-240V~,50Hz / 220-230V~,60Hz : (42NQV050M,42NQV060M,42NQV050M-N,42NQV060M-N) 220-240V~,50Hz : 42NQV050M-A,42NQV060M-A Heat Exchanger GRN&YEL – 18 –...

  • Page 20: Specifications Of Electrical Parts

    FILE NO. SVM-10052 6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type Specifications Fan motor ICF-340-30-2B DC-340V, 30W (for indoor) ( − ) Ω Room temp. sensor (TA-sensor) at 25°C − Heat exchanger temp. sensor (TC-sensor) 10kΩ at 25°C Louver motor MP24Z3T Output (Rated) 1W, 16 poles, DC12V...

  • Page 21: Refrigerant Cycle Diagram

    FILE NO. SVM-10052 7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram 42NQV050M / 38NYV050M2 42NQV050M-N / 38NYV050M2 42NQV050M-A / 38NYV050M-A Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Pressure measurement Chargeless : 15m...
  • Page 22 FILE NO. SVM-10052 42NQV060M / 38NYV060M2 42NQV060M-N / 38NYV060M2 42NQV060M-A / 38NYV060M-A Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Charge : 20g/m Outer dia.

  • Page 23: Control Block Diagram

    Circuit Converter (D.C circuit) Noise Filter Serial Signal Transmitter/Receiver From Outdoor Unit Serial Signal Communication 220-240V~, 50Hz / 220-230V~, 60Hz : 42NQV050M,42NQV060M, (Operation Command and Information) 42NQV050M-N,42NQV060M-N 220-240V~, 50Hz : 42NQV050M-A,42NQV060M-A Remote Controller Infrared Rays, 36.7kHz REMOTE CONTROLLER Operation (...
  • Page 24 FILE NO. SVM-10052-1 8-2. Outdoor Unit (Inverter Assembly) – 23 –...

  • Page 25: Operation Description

    FILE NO. SVM-10052 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 DC motor for the indoor to IGBT module (Compressor stop function) for motor and the outdoor fan motor.
  • Page 26 FILE NO. SVM-10052 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. Outdoor fan motor control ................... 30 4.

  • Page 27: Basic Operation

    FILE NO. SVM-10052 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 28: Cooling/Heating Operation

    FILE NO. SVM-10052 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 29: 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 air flow rate 42NQV060M,42NQV060M-N 42NQV050M,42NQV050M-N 42NQV060M-A 42NQV050M-A Fan speed COOL HEAT DRY level Fan speed Air flow r ate...
  • Page 30 FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description 1) When setting the fan speed to L, 2. Indoor fan <In heating operation> L+, M, M+ or H on the remote motor control controller, the operation is per- formed with the constant speed HEAT ON shown in Fig.

  • Page 31: Outdoor Fan Motor Control

    FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description The blowing air volume at the outdoor unit side is controlled. 1) The operation command sent 3. Outdoor fan from the remote controller is motor control Receiving the operation command from the controller of processed by the indoor unit indoor unit, the controller of outdoor unit controls fan speed.

  • Page 32: Capacity Control

    FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description The cooling or heating capacity depending on the load is 1) The difference between set 4. Capacity adjusted. temperature on remote controller control (Ts) and room temperature (Ta) According to difference between the setup value of tempera- is calculated.

  • Page 33: Release Protective Control By Temperature Of Indoor Heat Exchanger

    FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description 1) When temperature of the indoor 6. Release protective <In cooling/dry operation> heat exchanger drops below 5°C, control by tempera- (Prevent-freezing control for indoor heat exchanger) the compressor speed is ture of indoor heat In cooling/dry operation, the sensor of indoor heat reduced.

  • Page 34: Defrost Control (Only In Heating Operation)

    FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description (This function removes frost adhered to the outdoor The necessity of defrost operation is 7. Defrost control heat exchanger.) detected by the outdoor heat exchanger (Only in heating temperature. The conditions to detect the operation) The temperature sensor of the outdoor heat ex- necessity of defrost operation differ in A,...

  • Page 35: Louver Control

    FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description 8. Louver control This function controls the air direction of the indoor unit. 1) Louver • The position is automatically controlled according to the operation position mode (COOL/HEAT). • 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 36: 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 42NQV050M, 42NQV060M, 42NQV050M-N...

  • Page 37: Temporary Operation

    FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description 10. Temporary Pressing [RESET] button starts the temporary opera- 1) When pressing [RESET] button, the tion of [AUTO] operation. When keeping [RESET] temporary [AUTO] operation starts. operation button pressed for 10 seconds or more, the temporary 2) When keeping [RESET] button pressed [COOL] operation is performed.

  • Page 38: Remote-A Or B Selection

    FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description 12. Remote-A or B Setting the remote controller 1. Purpose selection This operation is to operate only one To separate using of remote control for each indoor indoor unit using one remote controller. unit in case of 2 air conditioner are installed nearly.

  • Page 39: Hi-Power Mode

    FILE NO. SVM-10052 Item Operation flow and applicable data, etc. Description 14. 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 40: Auto Restart Function

    FILE NO. SVM-10052 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 41: How To Cancel The Auto Restart Function

    FILE NO. SVM-10052 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 42: Remote Controller And Its Fuctions

    FILE NO. SVM-10052 9-4. Remote Controller and Its Fuctions 9-4-1. Parts Name of Remote Controller • • Infrared signal emitter ‚ Start/Stop button ( ƒ Mode select button ( „ Temperature button ( … Fan speed button ( † Swing louver button ( ‡...
  • Page 43 FILE NO. SVM-10052 4. Hi-POWER OPERATION To automatically control room temperature and airflow for faster cooling or heating operation (except in DRY and FAN ONLY mode) Press HI-POWER : Start and stop the operation. 5. ECO OPERATION To automatically control room to save energy (except in DRY and FAN ONLY mode) Press : Start and stop the operation.
  • Page 44 FILE NO. SVM-10052 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 45: Name And Functions Of Indications On Remote Controller

    FILE NO. SVM-10052 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 TIMER and clock time indicator This transmission mark indicates when the The time setting for timer operation or the clock remote controller transmits signals to the indoor time is indicated.

  • Page 46: Installation Procedure

    FILE NO. SVM-10052 10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units For the rear left and left piping • Installation Hook plate Wall Insert the cushion between the indoor unit and wall, and tilt the indoor unit for better operation.
  • Page 47 Q’ty Refrigerant piping Indoor unit name Liquid side (Outer diameter) Gas side (Outer diameter) 1 ea. 42NQV050M,42NQV060M 6.35 mm 12.7 mm 42NQV050M-N,42NQV060M-N 42NQV050M-A,42NQV060M-A Shield pipe (for extension drain hose) (polyethylene foam, 6 mm thick) Attachment bolt arrangement of outdoor unit...
  • Page 48 FILE NO. SVM-10052 10-2-3. 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 acciden- tally, 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 FILE NO. SVM-10052 10-3. Indoor Unit 10-3-2. Drilling a Hole and Mounting Instal- lation Plate 10-3-1. Installation Place • A place which provides enough spaces around the Drilling a hole indoor unit as shown in the diagram. When install the refrigerant pipes from the rear. •...
  • Page 50 FILE NO. SVM-10052 10-3-3. Electrical Work When the installation plate is directly 1. The supply voltage must be the same as the mounted on the wall rated voltage of the air conditioner. 1. Securely fit the installation plate onto the wall by 2.
  • Page 51 FILE NO. SVM-10052 10-3-5. Piping and Drain Hose Installation CAUTION CAUTION • Be sure to refer to the wiring system diagram Piping and drain hose forming labeled inside the front panel. • Since condensation results in machine trouble, • Check local electrical regulations for any make sure to insulate both the connecting pipes specific wiring instructions or limitations.
  • Page 52 FILE NO. SVM-10052 How to attach the drain cap In case of bottom right or bottom left piping 1. Insert hexagonal wrench (4 mm). • After making slits on the front panel with a knife or similar tool, cut them out with a pair of nippers or an equivalent tool.
  • Page 53 FILE NO. SVM-10052-1 CAUTION Information • Bind the auxiliary pipes (two) and connecting The lower part of indoor unit may float, cable with facing tape tightly. due to the condition of piping and you In case of leftward piping and rear-leftward cannot fix it to the installation plate.
  • Page 54 FILE NO. SVM-10052 10-4. Outdoor Unit Precautions for adding refrigerant • Use a scale having a precision with at least 10 g 10-4-1. Installation Place per index line when adding the refrigerant. • A place which provides enough space around the outdoor unit as shown in the diagram.
  • Page 55 FILE NO. SVM-10052 10-4-2. Draining the Water 10-4-3. Refrigerant Piping Connection • Holes are provided on the base plate of the Flaring outdoor unit to ensure that the defrost water produced during heating operations is drained off 1. Cut the pipe with a pipe cutter. efficiently.
  • Page 56 FILE NO. SVM-10052 Tightening Connection Use a vacuum pump Align the centers of the connecting pipes and tighten Be sure to use a vacuum pump with counter-flow the flare nut as much as possible with your fingers. prevention function so that oil inside the pump does Then tighten the nut with a wrench and torque not flow back into the air conditioner pipes when the wrench as shown in the figure.
  • Page 57 42NQV060M-N, Model 42NQV050M-N, 42NQV060M-A 42NQV050M-A Hexagonal wrench is required. 220-240V ~50Hz / 220-230V ~60Hz, Single phase Power source (for 42NQV050M,42NQV060M,42NQV050M-N,42NQV060M-N) 220-240V ~50Hz, Single phase (for 42NQV050M-A,42NQV060M-A) Maximum running 12.0 A 13.5 A current 16 A breaker or fuse Installation fuse (All types can be used.)
  • Page 58 FILE NO. SVM-10052 10-5. Test Operation 10-5-4. Remote Controller A or B Selection Setting 10-5-1. Gas Leak Test When two indoor units are installed in the separated rooms, it • Check the flare nut connections for gas leaks with is not necessary to change the selector switches. a gas leak detector and/or soapy water.

  • Page 59: How To Diagnose The Trouble

    FILE NO. SVM-10052-1 11. HOW TO DIAGNOSE THE TROUBLE The pulse motor circuits are mounted to both indoor and outdoor units. Therefore, diagnose troubles according to the trouble diagnosis procedure as described below. (Refer to the check points in servicing written on the wiring diagrams attached to the indoor/outdoor units.) Table 11-1 Troubleshooting Procedure First Confirmation...
  • Page 60 FILE NO. SVM-10052 CAUTION A high voltage (equivalent to the supply voltage) is also energized to ground through the sensors, PMV and other low-voltage circuits. The sensor leads and other wires are covered with insulated tubes for protection. Nevertheless, care must be taken to ensure that these wires are not pinched. Take sufficient care to avoid directly touching any of the circuit parts without first turning off the power.
  • Page 61 FILE NO. SVM-10052 11-1. First Confirmation 11-1-1. Confirmation of Power Supply Confirm that the power breaker operates (ON) normally. 11-1-2. Confirmation of Power Voltage Confirm that power voltage is AC 220–230–240 ± 10%. If power voltage is not in this range, the unit may not operate normally. 11-1-3.
  • Page 62 FILE NO. SVM-10052 11-2. Primary Judgment To diagnose the troubles, use the following methods. 1) Judgment by flashing LED of indoor unit 2) Self-diagnosis by service check remote controller 3) Judgment of trouble by every symptom Firstly use the method 1) for diagnosis. Then, use the method 2) or 3) to diagnose the details of troubles. 11-3.
  • Page 63 FILE NO. SVM-10052 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 64 FILE NO. SVM-10052 11-4-2 Caution at Servicing 1. After using the service mode of remote controller finished, press the [ ] button to reset the remote controller to normal function. 2. After finished the diagnosis by the remote controller, turn OFF power supply and turn its ON again to reset the air conditioner to normal operation.
  • Page 65 FILE NO. SVM-10052 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Serial signal 1) Defective wiring of the Indoor unit Flashes when 1) to 3) The outdoor unit never and connecting connecting cable or operates...
  • Page 66 FILE NO. SVM-10052 Block distinction Operation of diagnosis function Judgment and action Check Check Block Cause of operation conditioner Remarks 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 67 FILE NO. SVM-10052 11-5. Judgement of Trouble by Every Symptom 11-5-1. Indoor unit (Including remote controller) Operation (1) Indoor unit is not operated. Check Item Considerable principle cause Turn off power supply once, and Measures 5 second later, turn it on again. Item by symptoms Is OPERATION indicator flashing? Is it possible to turn on...
  • Page 68 FILE NO. SVM-10052 (3) Only the indoor motor fan does not operate <Primary check> 1. Is it possible to detect the power supply voltage (AC220–240V) between on the terminal block? 2. Does the indoor fan motor operate in cooling operation? (In heating operation, the indoor fan motor does not operate for approximately 10 minutes after it is turned on, to prevent a cold air from blowing in.) Turn off power...
  • Page 69 FILE NO. SVM-10052 Is it possible to Does check display Replace change airflow level remote on remote show high? to “HIGH”? Change the new PC Replace board. Does fan speed motor change? Fan motor operates normally. Is it possible to Does check cross-flow Replace bearing rotate cross-flow fan by...
  • Page 70 FILE NO. SVM-10052 (4) Indoor fan motor automatically starts to rotate by turning on power supply <Cause> The IC is built in the indoor fan motor. Therefore the P.C. board is also mounted to inside of the motor. If the P .C. board is soldered imperfectly or the IC is defective, the fan motor may automatically rotate by turning on power supply.
  • Page 71 FILE NO. SVM-10052 (5) Troubleshooting for remote controller <Primary check> Check that A or B selected on the main unit is matched with A or B selected on the remote controller. The unit does not beep at all. Push the [ ] button.
  • Page 72 FILE NO. SVM-10052 11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire) (1) Outdoor unit does not operate 1) Is the voltage between of the indoor terminal block varied? Confirm that transmission from indoor unit to outdoor unit is correctly performed based upon the follow- ing diagram.
  • Page 73 FILE NO. SVM-10052 11-6. Check Code 1C (Miswiring in indoor/outdoor units) and 1E <Check procedure> Gas leakage, Discharge temp. error, disconnection of TS/TC gas leakage sensors (Check code 02, 1C) (Check code 03, 1E) Valve drive check Is coil of the pulse motor valve Set it correctly.
  • Page 74 FILE NO. SVM-10052 11-7. How to Diagnose Trouble in Outdoor Unit Check Power Supply (Voltage Rate ±10%) Turn OFF power supply. Remove connector of compressor. • Connect discharge Check 25A resistance (approx. 100Ω, fuse (F01) 40W) or soldering iron failure? (plug) between +, –...
  • Page 75 FILE NO. SVM-10052 Does outdoor fan operate normally? Turn OFF power supply. Does compresser operate normally? Remove connector CN300 of outdoor fan motor. Check winding resistance by ohmmeter are correct? Compressor Check rotor locking by rotate is normal with hand. Can it rotate? Turn OFF power supply.
  • Page 76 FILE NO. SVM-10052 11-8. How to Check Simply the Main Parts (2) Inspection procedures 1) When a P.C. board is judged to be defective, 11-8-1. How to check the P.C. board (Indoor unit) check for disconnection, burning, or discolora- tion of the copper foil pattern or this P.C. board. (1) Operating precautions 2) The P.C.
  • Page 77 FILE NO. SVM-10052 11-8-3. P.C. Board Layout +12V [1] Sensor characteristic table : Discharge temp. sensor : Room temp. sensor TC, TCJ : Heat exchanger temp. sensor : Outdoor temp. sensor TA, TC, TCJ, TO, TE, TS : Outdoor heat exchanger temp. sensor : Suction temp.
  • Page 78 FILE NO. SVM-10052 11-8-4. Indoor Unit (Other Parts) Part name Checking procedure Room temp. (TA) sensor Disconnect the connector and measure the resistance value with tester. Heat exchanger (TC) sensor (Normal temp.) Temperature 10°C 20°C 25°C 30°C 40°C Sensor TA, TC (kΩ) 20.7 12.6 10.0...
  • Page 79 FILE NO. SVM-10052 11-8-6. Checking Method for Each Part Part name Checking procedure Electrolytic capacitor 1. Turn OFF the power supply breaker. (For boost, smoothing) 2. Discharge all three capacitors completely. 3. Check that safety valve at the bottom of capacitor is not broken. 4.
  • Page 80 FILE NO. SVM-10052 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 10 seconds though it started rotating. • Outdoor fan motor rotates or does not rotate according to the position where the fan stopped, etc. Remote controller check code “02 : Outdoor block, 1A : Outdoor fan drive system error”...

  • Page 81: How To Replace The Main Parts

    FILE NO. SVM-10052 12. HOW TO REPLACE THE MAIN PARTS WARNING • Since high voltages pass through the electrical parts, turn off the power without fail before proceeding with the repairs. Electric shocks may occur if the power plug is not disconnected. •...
  • Page 82 FILE NO. SVM-10052 Part name Procedures Remarks Front panel 4) Press "PUSH" part under the front panel  and remove hooks of the front panel from the installation plate. Installation plate Front panel Press 5) Remove the front panel fixing screws. (4 pcs.) 6) Take off four hooks of panel from rear side.
  • Page 83 FILE NO. SVM-10052 Part name Procedures Remarks Electric parts ‚ 1) Remove screw of earth lead attached to the box assembly end plate of the evaporator. 2) Remove the lead wire cover, and remove connector for the fan motor and connec- tor for the louver motor from the electric parts box assembly.
  • Page 84 FILE NO. SVM-10052 Part name Procedures Remarks Horizontal louver 1) Remove shaft of the horizontal louver from the back body. (First remove the left shaft, and then remove other shafts while sliding the horizontal louver leftward.) Evaporator 1) Follow to the procedure in the item (Heat exchanger) 2) Remove the pipe holder from the rear side of the main unit.
  • Page 85 FILE NO. SVM-10052 Part name Procedures Evaporator 4) Remove three fixing screw at the right (Heat exchanger) side of the heat exchanger, and separate the heat exchanger from the back body. (Figure 4, 5) One screw (Figure 4) One screw (Figure 5) Bearing 1) Follow to the procedure in the item...
  • Page 86 FILE NO. SVM-10052 Part name Procedures Remarks Fan motor 1) Follow to the procedure till item „ 2) Loosen the set screw of the cross flow fan. 3) Remove two fixing screws of the motor cover and them remove the motor cover. 4) Remove two more fixing screws of the motor band and remove the motor band.
  • Page 87 FILE NO. SVM-10052 Part name Procedures Remarks Cross flow fan <Caution at reassembling> 1) To incorporate the fan motor incorporate the motor into the position in the following figure, and then install the fan motor. • Install the cross flow fan so that the right end of the 1st joint from the right of the cross flow fan is set keeping 5.0 mm from closed wall of the main unit.
  • Page 88 FILE NO. SVM-10052 12-2. Outdoor Unit Part name Procedure Remarks  Common 1. Detachment procedure NOTE Upper cabinet Wear gloves for this job. Otherwise, you may injure your • hands on the parts, etc. Waterproof cover 1) Stop operation of the air conditioner, •...
  • Page 89 FILE NO. SVM-10052 Part name Procedure Remarks ‚ Front cabinet 1. Detachment  1) Perform step 1 in 2) Remove the fixing screws (ST1TØ4 × 10L 2 pcs.) used to secure the front cabinet and inverter cover, the screws (ST1TØ4 ×...
  • Page 90 FILE NO. SVM-10052 Part name Procedure Remarks  ƒ Inverter 1) Perform work of item 1 in Inverter cover assembly 2) Remove screw (ST1TØ4 × 10L 2 pcs.) of the P.C. board upper part of the front cabinet. (Soldered surface) •...
  • Page 91 FILE NO. SVM-10052 Part name Procedure Remarks „ Control board 1. Disconnect the leads and connectors connected to assembly the other parts from the control board assembly. 1) Leads CN603 • 3 leads (black, white, orange) connected to terminal block. CN601 •...
  • Page 92 FILE NO. SVM-10052 Part name Procedure Remarks … Side cabinet 1. Side cabinet (right) ‚ 1) Perform step 1 in and all the steps in ƒ 2) Remove the fixing screw (ST1TØ4 × 10L 4 pcs.) used for securing the side cabinet to the bottom plate and valve fixing panel.
  • Page 93 FILE NO. SVM-10052 Part name Procedure Remarks  ‚ ƒ „ ‡ Compressor 1) Perform work of item 1 of … 2) Extract refrigerant gas. 3) Remove the partition board. (ST1TØ4 × 10L 3 pcs.) 4) Remove the sound-insulation material. 5) Remove terminal cover of the compressor, Compressor and disconnect lead wire of the compressor...
  • Page 94 FILE NO. SVM-10052 Part name Procedure Remarks ‰ Electronic 1. Detachment expansion valve ‚ ƒ 1) Perform step 1 in , all the steps in coil … and 1 in Lead 2) Remove the coil by rotating it at 90° connecting part toward either direction.
  • Page 95 FILE NO. SVM-10052 Part name Procedure Remarks TE sensor (outdoor heat exchanging temperature sensor) • Attachment With the leads pointing downward and the sensor leads pointing in the direction shown in the figure, install the sensor onto the straight pipe part of the condenser output pipe. Detail C for 38NYV050M2, Detail C for 38NYV060M2, 38NYV050M-A...

  • Page 96: Exploded Views And Parts List

    PIPE, SHIELD (Made in Thailand) 43T03014 BODY ASSY, BACK (Made in Thailand) 43T83003 HOLDER, REMOTE CONTROL 43T44030 EVAPORATOR ASSY (Made in Thailand) (Made in Thailand) (42NQV050M) 43T82008 PLATE, INSTALLATION 43T44031 EVAPORATOR ASSY (42NQV060M) (Made in Thailand) 43T09043 GRILLE ASSY, SUB...
  • Page 97 FILE NO. SVM-10052 Indoor Unit (Part-E) Location Part Location Part Description Description 43T50308 SENSOR HEAT EXCHANGER 43T69738 PC BOARD ASSY (42NQV050M, 43T60331 TERMINAL; 3P 42NQV050M-N,42NQV050M-A) 43T69739 PC BOARD ASSY (42NQV060M, 43T69320 TEMPERATURE SENSOR 42NQV060M-N,42NQV060M-A) (Made in Thailand) 43T21397 LOUVER MOTOR (Made in Thailand)
  • Page 98 FILE NO. SVM-10052-2 13-2. Indoor Unit 42NQV050M-A,42NQV060M-A 42NQV050M-N,42NQV060M-N Location Part Location Part Description Description 43T21371 MOTOR, FAN (42NQV050M-A, 43T79313 CAP, DRAIN (Made in Malaysia) 42NQV060M-A) 43T39020 BAND, MOTOR, LEFT 43T21430 MOTOR, FAN (42NQV050M-N, (Made in Thailand) 42NQV060M-N) 43T39023 BAND,MOTOR, RIGHT DOWN...
  • Page 99 FILE NO. SVM-10052 13-3. P.C. Board Layout (Outdoor) Location Part Location Part Description Description 43T60392 TERMINAL-5P 43T62320 HEATSINK (38NYV050M2, 38NYV050M-A) 43T60326 FUSE 43T62331 HEATSINK (38NYV060M2, 43T60377 TEMPERATURE SENSOR 38NYV060M-A) 43T50304 SENSOR;HEAT EXCHANGER 43T69880 PC BOARD (38NYV050M2, (Made in Thailand) 38NYV050M-A) 43T62313 BASE-PLATE-PC (Made in Thailand) 43T69881...
  • Page 100 FILE NO. SVM-10052 13-4. Outdoor Unit 38NYV050M2, 38NYV050M-A Location Part Location Part Description Description 43T00468 FRONT CABINET 43T63332 COIL-PMV 43T00459 LEFT CABINET (Made in Thailand) 43T58306 REACTOR (Made in Thailand) 43T42327 BASE PLATE ASSEMBLY 43T20319 PROPELLER FAN (Made in Thailand) (Made in Thailand) 43T21375 FAN-MOTOR...
  • Page 101 FILE NO. SVM-10052 13-5. Outdoor Unit 38NYV060M2, 38NYV060M-A Location Part Location Part Description Description 43T00468 FRONT CABINET 43T58306 REACTOR (Made in Thailand) 43T00459 LEFT CABINET (Made in Thailand) 43T20319 PROPELLER FAN (Made in Thailand) 43T42327 BASE PLATE ASSEMBLY 43T21375 FAN-MOTOR (Made in Thailand) 43T47001 NUT FLANGE (Made in Japan)
  • Page 102 TOSHIBA CARRIER (THAILAND) CO.,LTD. 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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