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Carrier 42NQV025H Service Manual

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SERVICE MANUAL

<High Wall, Heat Pump Type>
42NQV025H
42NQV035H
42NQV035M
42NQV045H
42NQV045M
R410A
Indoor Unit
FILE NO. SVM-07013-1
SPLIT TYPE
Outdoor Unit
<Heat Pump Type>
38NYV025H
38NYV035H
38NYV035M
38NYV045H
38NYV045M
Revised May, 2007

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Summary of Contents for Carrier 42NQV025H

  • Page 1: Service Manual

    FILE NO. SVM-07013-1 SERVICE MANUAL SPLIT TYPE Indoor Unit Outdoor Unit <High Wall, Heat Pump Type> <Heat Pump Type> 42NQV025H 38NYV025H 42NQV035H 38NYV035H 42NQV035M 38NYV035M 42NQV045H 38NYV045H 42NQV045M 38NYV045M R410A Revised May, 2007...

  • Page 2: Table Of Contents

    FILE NO. SVM-07013 CONTENTS SAFETY PRECAUTIONS ..................... 3 SPECIFICATIONS ......................5 3. REFRIGERANT R410A ....................8 4. CONSTRUCTION VIEWS ..................... 16 5. WIRING DIAGRAM ....................... 18 6. SPECIFICATIONS OF ELECTRICAL PARTS .............. 20 7. REFRIGERANT CYCLE DIAGRAM ................21 . CONTROL BLOCK DIAGRAM ..................25 9.

  • Page 3: Safety Precautions

    FILE NO. SVM-07013 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-07013 • 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-07013 2. SPECIFICATIONS 2.1 Specification Unit model Indoor 42NQV025H 42NQV035M 42NQV035H Outdoor 38NYV025H 38NYV035M 38NYV035H Cooling capacity (kW) Cooling capacity range (kW) 1.1-3.0 1.1-3.9 0.8-4.0 Heating capacity (kW) Heating capacity range (kW) 0.9-4.7 0.9-4.9 0.9-5.7 1Ph/50Hz/220-240V Power supply...
  • Page 6 FILE NO. SVM-07013 Unit model Indoor 42NQV045M 42NQV045H Outdoor 38NYV045M 38NYV045H Cooling capacity (kW) Cooling capacity range (kW) 0.8-4.9 0.8-4.9 Heating capacity (kW) Heating capacity range (kW) 0.9-6.1 0.9-6.8 Power supply 1Ph/50Hz/220-240V Electric Indoor Operation mode Cooling Heating Cooling Heating characteristic Running current 0.21-0.19...

  • Page 7: Operation Characteristic Curve

    2-2. Operation Characteristic Curve FILE NO. SVM-07013 <Cooling> <Heating> 42NQV045H 42NQV045H 42NQV045M 42NQV035H 42NQV045M 42NQV025H 42NQV035H 42NQV035M 42NQV035M 42NQV025H Conditions Conditions Indoor : DB 27 C/WB 19 Indoor : DB 20 Outdoor : DB 35 Outdoor : DB 7 C/WB 6...

  • Page 8: Refrigerant R410A

    FILE NO. SVM-07013 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 9 FILE NO. SVM-07013 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 10 FILE NO. SVM-07013 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 11 FILE NO. SVM-07013 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 12 FILE NO. SVM-07013 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 13: Recharging Of Refrigerant

    FILE NO. SVM-07013 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 14 FILE NO. SVM-07013 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 15 FILE NO. SVM-07013 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 16: Construction Views

    FILE NO. SVM-07013-1 4.CONSTRUCTION VIEWS 4-1. Indoor Unit Air filter Air inlet Front panel Heat exchanger Knock out system Knock out system Installation plate hanger Wireless remote controller Installation plate hanger Drain hose (0.50m) Connecting pipe (0.35m) Connecting pipe (0.40m) (For 42NQV025M, 035M, 035H;...

  • Page 17: Outdoor Unit

    FILE NO. SVM-07013 4.2 Outdoor Unit Ø6 hole R5.5 Ø6 hole Ø11x14 hole A detail Drawing (Back leg) Ø 11 x 14 Hole 25 Drain outlet Ø B Detail Drawing (Front leg) (For 8 - 10 anchor bolt) Ø Ø FAN-GUARD Ø...

  • Page 18: Wiring Diagram

    FILE NO. SVM-07013 5. WIRING DIAGRAM 5-1. 42NQV025H / 38NYV025H, 42NQV035H / 38NYV035H 42NQV035M / 38NYV035M – 18 –...
  • Page 19 FILE NO. SVM-07013 5-2. 42NQV045H / 38NYV045H, 42NQV045M / 38NYV045M – 19 –...

  • Page 20: Specifications Of Electrical Parts

    FILE NO.SVM-07013 6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type Specifications 42NQV025H, 42NQV035H, MMF-240-20-4B AC240/220V, 20W Fan motor 42NQV035M (for indoor) DC 340V, 30W ICF-340-30-2 42NQV045H, 42NQV045M ( − ) Room temp. sensor (TA-sensor) at 25°C Ω...

  • Page 21: Refrigerant Cycle Diagram

    FILE NO. SVM-07013 7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram 42NQV025H / 38NYV025H 42NQV035M / 38NYV035M Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 1m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Outer dia.
  • Page 22 FILE NO. SVM-07013 42NQV035H / 38NYV035H 42NQV045M / 38NYV045M Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 1m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Charge : 20g/m Outer dia. : 6.35mm Vacuum pump connecting port (16 to 20m) Thickness : 0.8mm...
  • Page 23 FILE NO. SVM-07013 42NQV045H / 38NYV045H Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 1m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Outer dia. : 6.35mm Charge : 20g/m Vacuum pump connecting port (16 to 20m) Thickness : 0.8mm...
  • Page 24 Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 27/19 35/- 42NQV025H 0.9 to 1.1 12 to 14 37 to 39 High High 42NQV035M 0.8 to 1.0 11 to 13 39 to 41 High High 42NQV035H 0.8 to 1.0...

  • Page 25: Control Block Diagram

    FILE NO. SVM-07013 8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit 42NQV035M Indoor Unit Control Unit M.C.U. Louver Functions Motor Heat Exchanger Sensor (Tc) • Cold draft preventing Function Room Temperature Sensor (Ta) Louver Motor • 3-minute Delay at Restart for Compressor Drive Control Infrared Rays Signal Receiver •...
  • Page 26 FILE NO. SVM-07013 42NQV025H, 42NQV035H Indoor Unit Control Unit M.C.U. Louver Functions Motor Heat Exchanger Sensor (Tc) • Cold draft preventing Function Room Temperature Sensor (Ta) Louver Motor • 3-minute Delay at Restart for Compressor Drive Control Infrared Rays Signal Receiver •...
  • Page 27 FILE NO. SVM-07013 42NQV045M Indoor Unit Control Unit M.C.U. Louver Functions Motor • Cold draft preventing Function Room Temperature Sensor (Ta) Louver Motor • 3-minute Delay at Restart for Compressor Drive Control Infrared Rays Signal Receiver • Fan Motor Starting Control and Indication Indoor Fan Motor Control...
  • Page 28 FILE NO. SVM-07013 42NQV045H Indoor Unit Control Unit M.C.U. Louver Functions Motor • Cold draft preventing Function Room Temperature Sensor (Ta) Louver Motor • 3-minute Delay at Restart for Compressor Drive Control Infrared Rays Signal Receiver • Fan Motor Starting Control and Indication Indoor Fan Motor Control...
  • Page 29 FILE NO. SVM-07013 8-2. Outdoor Unit – 30 –...

  • Page 30: Operation Description

    FILE NO. SVM-07013 9. OPERATION DESCRIPTION 9-1. Outline of Air Conditioner Control • Detection of inverter input current and current release operation This air conditioner is a capacity-variable type air • Over-current detection and prevention operation conditioner, which uses AC or DC motor for the indoor to IGBT module (Compressor stop function) for motor and the outdoor fan motor.
  • Page 31 FILE NO. SVM-07013 9-2. Operation Description 1. Basic operation ......................30 1. Operation control ....................30 2. Cooling/Heating operation ..................31 3. AUTO operation ..................... 31 4. DRY operation ......................31 2. Indoor fan motor control ..................... 32 3. Outdoor fan motor control ................... 34 4.

  • Page 32: Operation Control

    FILE NO. SVM-07013 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 33: Cooling/Heating Operation

    FILE NO. SVM-07013 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 34 *5 : Fan speed = (M + –L) x 1/4 + L +1.0 +0.5 (Linear approximation L(W6) from M+ and L) (Table 1) Indoor fan air flow rate Fan speed 42NQV025H 42NQV035M 42NQV035H 42NQV045M 42NQV045H level COOL HEAT DRY Fan speed...
  • Page 35 FILE NO. SVM-07013 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 36: Outdoor Fan Motor Control

    FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 3. Outdoor fan The blowing air volume at the outdoor unit side is controlled. 1) The operation command sent motor control from the remote controller is Receiving the operation command from the controller of processed by the indoor unit indoor unit, the controller of outdoor unit controls fan speed.

  • Page 37: Capacity Control

    FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 4. Capacity The cooling or heating capacity depending on the load is 1) The difference between set control adjusted. temperature on remote controller (Ts) and room temperature (Ta) According to difference between the setup value of tempera- is calculated.
  • Page 38 FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 6. 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 39: Defrost Control (Only In Heating Operation)

    FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 7. 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 40: Louver Control

    FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 8. 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 41: 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 42NQV025H 42NQV035M 42NQV035H 42NQV045M,42NQV045H Cool min DRY max <Heating operation>...

  • Page 42: Temporary Operation

    FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 10. 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 43 FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 12. Pulse This function controls throttle amount of the 1) When starting the operation, move the Modulating refrigerant in the refrigerating cycle. valve once until it fits to the stopper. valve (P.M.V.) (Initialize) According to operating status of the air conditioner,...
  • Page 44 FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 13. Romote-A or B 1. Purpose Setting the remote controller 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 45: Hi-Power Mode

    FILE NO. SVM-07013 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 46 FILE NO. SVM-07013 Item Operation flow and applicable data, etc. Description 16. Short Timer In the normal condition, after switching one circuit Purpose breaker, 3-minute delay time for compressor To start the unit immediately for the purpose of is set for the maintenance of the unit. testing, trial...etc, short timer can be used.

  • Page 47: Auto Restart Function

    FILE NO. SVM-07013 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 48: How To Cancel The Auto Restart Function

    FILE NO. SVM-07013 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 49: Remote Control And Its Functions

    FILE NO. SVM-07013 9-5. Remote control 9-5-1. Remote control and its functions 1 Infrared signal emitter 2 Start/Stop button ( ) 3 Mode select button ( ) 4 Temperature button ( ) 5 Fan speed button ( ) 6 Swing louver button ( ) 7 Set louver button ( ) 8 On timer button ( ) 9 Off timer button ( )
  • Page 50 FILE NO. SVM-07013 3. DRY OPERATION (COOLING ONLY) For dehumidification, a moderate cooling performance is controlled automatically. 1. Press MODE : Select Dry 2. Press MODE : Set the desired temperature. 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.
  • Page 51 FILE NO. SVM-07013 8. PRESET OPERATION Set your preferred operation for future use. The setting will be memorized by the unit for future operation (except air flow direction). 1. Select your preferred operation. 2. Press and hold PRESET for 3 seconds to memorize the setting. The mark displays.

  • Page 52: Name And Functions Of Indications On Remote Controller

    FILE NO. SVM-07013 9-5-3. Name and Functions of Indications on Remote Controller [Display] All indications, except for the clock time indicator, are displayed by pressing the button. 1 . Transmission mark 5 . 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...

  • Page 53: Installation Procedure

    FILE NO. SVM-07013 10. INSTALLATION PROCEDURE 10-1. 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. Do not allow the drain hose to get slack.
  • Page 54 Parts name Q’ty Refrigerant piping Indoor unit name Gas side (Outer diameter) Liquid side (Outer diameter) 1 ea. 42NQV025H,42NQV035H,42NQV035M 6.35 mm 9.52 mm 42NQV045H,42NQV045M 6.35 mm 12.7 mm Shield pipe (for extension drain hose) (polyethylene foam, 6 mm thick) Attachment bolt arrangement of outdoor unit Elongated •...
  • Page 55 FILE NO. SVM-07013 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 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 56: Indoor Unit

    FILE NO. SVM-07013-1 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 57 FILE NO. SVM-07013 10-3-3. Electrical Work When the installation plate is directly mounted on the wall 1. The supply voltage must be the same as the rated voltage of the air conditioner. 1. Securely fit the installation plate onto the wall by 2.
  • Page 58 FILE NO. SVM-07013 10-3-5. Piping and Drain Hose Installation CAUTION CAUTION Piping and drain hose forming • Be sure to refer to the wiring system diagram 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 59 FILE NO. SVM-07013 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 60 FILE NO. SVM-07013 10-3-7. Drainage CAUTION 1. Run the drain hose at a downward sloped angle. • Bind the auxiliary pipes (two) and connecting cable with facing tape tightly. NOTE : In case of leftward piping and rear-leftward • Hole should be made at a slight downward slant piping, bind the auxiliary pipes (two) only with on the outdoor side.
  • Page 61 FILE NO. SVM-07013 10-4. Outdoor Unit Precautions for adding refrigerant 10-4-1. Installation Place • Use a scale having a precision with at least 10 g per index line when adding the refrigerant. • A place which provides enough space around the outdoor unit as shown in the diagram.
  • Page 62 FILE NO. SVM-07013 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 63 FILE NO. SVM-07013-1 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 64 FILE NO. SVM-07013 Revised Packed Valve handling precautions • Open the valve stem all the way; but do not try to open it beyond the stopper. 1 2 3 • Securely tighten the valve stem cap with torque in the following table: Gas side (Ø12.7 mm) 50 to 62 N•m (5.0 to 6.2 kgf•m) Earth line...

  • Page 65: Test Operation

    FILE NO. SVM-07013 10-5. Test Operation 10-5-4. Remote Controller A or B Selection Setting 10-5-1. Gas Leak Test When two indoor units ae installed in seperated rooms, • Check the flare nut connections for gas leaks with there is no need to change the selector switch. a gas leak detector and/or soapy water.

  • Page 66: How To Diagnose The Trouble

    FILE NO. SVM-07013 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...
  • Page 67 FILE NO. SVM-07013 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.

  • Page 68: First Confirmation

    FILE NO. SVM-07013 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 69: Primary Judgment

    FILE NO. SVM-07013 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 70 FILE NO. SVM-07013-1 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 71 FILE NO. SVM-07013 11-4-2. Caution at Servicing 1. After servicing, press the START/STOP 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 72 FILE NO. SVM-07013 Block distinction Operation of diagnosis function Judgment and action Check Check Block Cause of operation conditioner Remarks code code status Outdoor P.C. Inverter over-current All off Displayed when Even if trying operation again, all board protective circuit error is detected.

  • Page 73: Judgment Of Trouble By Every Symptom

    1. Is the supply voltage normal? 2. Is the normal voltage provided to the outdoor unit? 3. Is the crossover cable connected properly? 4. Is the fuse (F01) blown? Operation (42NQV025H, 42NQV035H, 42NQV035M) Check Item Considerable principle cause Turn off power supply once, and Measures 5 second later, turn it on again.
  • Page 74 FILE NO. SVM-07013 (42NQV045H, 42NQV045M) Operation 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 Does transmission mark power supply by pushing on remote controller flash Remote controller is defective.
  • Page 75 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.) (42NQV025H, 42NQV035H, 42NQV035M) Turn off power supply once, and turn it on again.
  • Page 76 FILE NO. SVM-07013 (42NQV045H, 42NQV045M) Turn off power supply once, and turn it on again. Is it possible to detect DC 1V or more between Does fan motor + and – of continue to operate? Peplace indoor motor connector (CN31). fan motor.
  • Page 77 FILE NO. SVM-07013 (4) Indoor fan motor automatically starts to rotate by turning on power supply (For DC fan motor in 42NQV045H, 42NQV045M) <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.
  • Page 78 FILE NO. SVM-07013 (For AC fan motor in 42NQV025H, 42NQV035H, 42NQV035M) <Inspection procedure> 1. Remove the front panel. (Remove 2 screws.) 2. Remove the cover of the fan motor lead wires. 3. Check AC voltage with CN31 connector while the fan motor is rotating.
  • Page 79 FILE NO. SVM-07013 (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 START/STOP button. Operation lamp on indoor unit is not indicated.
  • Page 80 FILE NO. SVM-07013 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 81 FILE NO. SVM-07013 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 82: How To Diagnose Trouble In Outdoor Unit

    FILE NO. SVM-07013 11-7. How to Diagnose Trouble in Outdoor Unit 11-7-1. Summarized Inner Diagnosis of Inverter Assembly Table 11-7-1 Diagnosis/Process flowchart Item Contents Summary Preparation Turn “OFF” the power supply breaker, and remove 3P Remove connector connector which connects of compressor.

  • Page 83: How To Check Simply The Main Parts

    FILE NO. SVM-07013 Diagnosis/Process flowchart Item Contents Summary Check Check winding resistance between phases of compres- sor, and resistance between outdoor frames by using a tester. → OK if 10MΩ or more • Is not grounded. Replace control board assembly. ...
  • Page 84 FILE NO. SVM-07013 (3) Check procedures (42NQV025H, 42NQV035H, 42NQV035M) Table 11-8-1 Procedure Check points Causes Turn off the power supply breaker Check whether or not the fuse (F01) Impulse voltage was applied or the and remove the P.C. board is blown.
  • Page 85 FILE NO. SVM-07013 Table 11-8-1 Check points Causes Procedure 1. Check it is impossible to detect 1. The indoor fan motor is defective. Connect the motor connector to the voltage (AC120V or higher (Protected operation of P.C. board.) the motor and turn on the power voltage) between red and black supply.
  • Page 86 FILE NO. SVM-07013 (42NQV045H, 42NQV045M) Table 11-8-1 Procedure Turn off the power supply breaker Check whether or not the fuse (F01) Impulse voltage was applied or the and remove the P.C. board is blown. indoor fan motor short-circuited. assembly from electronic parts base.
  • Page 87 FILE NO. SVM-07013 Table 11-8-1 Check points Causes Procedure 1. Check it is impossible to detect Connect the motor connector to 1. The indoor fan motor is defective. the voltage (DC 15V) between 3 the motor and turn on the power (Protected operation of P.C.
  • Page 88 FILE NO. SVM-07013 11-9. P .C . Board Layout (42NQV025H, 42NQV035H, 42NQV035M) +12V [1] Sensor characteristic table TD : Discharge temp. sensor TA : Room temp. sensor TC : Heat exchanger temp. sensor TO : Outdoor temp. sensor TA, TC, TO, TE, TS TE : Outdoor heat exchanger temp.
  • Page 89 FILE NO. SVM-07013 (42NQV045H, 42NQV045M) +12V [1] Sensor characteristic table TD : Discharge temp. sensor TA : Room temp. sensor TC : Heat exchanger temp. sensor TO : Outdoor temp. sensor TA, TC, TO, TE, TS TE : Outdoor heat exchanger temp. sensor TS : Suction temp.
  • Page 90 FILE NO. SVM-07013 11-9-2. 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 91 FILE NO. SVM-07013 11-9-4. 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 92: How To Simply Judge Whether Outdoor Fan Motor Is Good Or Bad

    FILE NO. SVM-07013 11-10. 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 tens 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 93: How To Replace The Main Parts

    FILE NO. SVM-07013 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 94 FILE NO. SVM-07013 Part name Procedures Remarks  Front panel 4) Press "PUSH" part under the front panel and remove hooks of the front panel from Installation plate the installation plate. Front panel Press 5) Remove the front panel fixing screws. (2 pcs.) 6) Take off three hooks of panel from rear side.
  • Page 95 6) Remove the fixing screw that secures the electric parts box assembly, and remove the assembly. Fixing screw AC fan motor connector (42NQV025H, 42NQV035H, Louver motor 42NQV035M) connecto <How to assemble the electric parts box> 1) Hook the top part of the electric parts box assembly onto the claws on the back body, and secure it using the fixing screw.
  • Page 96 FILE NO. SVM-07013 Part name Procedures Remarks ƒ 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 97 FILE NO. SVM-07013 Part name Procedures Remarks „ … Bearing 1) Follow to the procedure in the item 2) Remove the two screws used to secure the bearing base. Two screws 3) Remove the bearing base. <Caution at assembling> • If the bearing is out from the housing, push it into the specified position and then incorporate it in the main body.
  • Page 98 FILE NO. SVM-07013 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 99 FILE NO. SVM-07013 Part name Procedures Remarks ‡ Cross flow fan <Caution at reassembling> 5 mm 1) To incorporate the fan motor, remove the fan motor rubber (at shaft core side), incorporate the motor into the position in the following figure, and then install the fan motor.
  • Page 100 P .C. board ass’y. 2) Remove the front panel. • Remove the 2 fixing screws. 3) Remove the electrical part base. <P.C. board layout> (42NQV025H, 42NQV035H, 42NQV035M) CN33 CN31 FUSE IC12 CN51 C121 C133 –...
  • Page 101 FILE NO. SVM-07013 (42NQV045H, 42NQV045M) +12V – 101 –...
  • Page 102 FILE NO. SVM-07013 12-2. Outdoor Unit Part name Procedure Remarks  Common 1. Detachment procedure Upper cabinet NOTE Wear gloves for this job. Otherwise, you may injure your hands on the parts, etc. Waterproof cover 1) Stop operation of the air conditioner, and turn off the main switch of the breaker for air conditioner.
  • Page 103 FILE NO. SVM-07013 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 104 FILE NO. SVM-07013 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 upper part of the front cabinet. P.C. board (Soldered surface) •...
  • Page 105 FILE NO. SVM-07013 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 CN600 CN701...
  • Page 106 FILE NO. SVM-07013 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 107 FILE NO. SVM-07013 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, and disconnect lead wire of the compressor Partition...
  • Page 108 FILE NO. SVM-07013 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 109 FILE NO. SVM-07013 Part name Procedure Remarks TE sensor (outdoor heat exchanging temperature sensor) • Attachment Install the sensor onto the straight pipe part of the condenser output pipe. Arrow D Detail B Detail C Detail A Detail C for 38NYV025H Detail C for 38NYV035H,38NYV045H 38NYV035M 38NYV045M...

  • Page 110: Exploded Views And Parts List

    13-1. Indoor Unit (1) Location Part Location Part Description Description 43T21397 LOUVER MOTOR 43T00491 PANEL SERVICE ASSEMBLY 43T21399 FAN MOTOR ASSEMBLY(42NQV035H) (42NQV035H),(42NQV025H), (42NQV035M),(42NQV025H) (42NQV045H) 43T21371 FAN MOTOR(42NQV045H,42NQV045M) 43T00490 PANEL SERVICE ASSEMBLY 43T22312 MOLD BEARING ASSEMBLY (42NQV045M),(42NQV035M) 43T70313 DRAIN HOSE 43T80321...
  • Page 111 TC SENSOR 43T69633 PC BOARD ASSY,WRS-LED 43T60002 TERMINAL BLOCK; 3P (42NQV035M),(42NQV045M) 43T50318 TEMPERATURE SENSOR 43T69635 PC BOARD(42NQV045M) 43T62003 CORD CLAMP 43T69636 PC BOARD(42NQV045H) 43T69634 PC BOARD ASSY,WRS-LED 43T69637 PC BOARD(42NQV035M) (42NQV025H),(42NQV035H), 43T69638 PC BOARD(42NQV025H) (42NQV045H) 43T69639 PC BOARD(42NQV035H) − 111 −...
  • Page 112 FILE NO. SVM-07013 13-3. Outdoor Unit For model 38NYV025H, For model 38NYV035H, 38NYV035M 38NYV045M,38NYV045H 19 : BIMETAL THERMO 29 : DRAIN NIPPLE 31 : HOLDER,SENSOR(TE) (FOR PIPE O.D. ∅ 6.35) 32 : HOLDER,SENSOR(TD) (FOR PIPE O.D. ∅ 8.0) 33 : HOLDER,SENSOR(TS) (FOR PIPE O.D. ∅ 9.52) –...
  • Page 113 FILE NO. SVM-07013 Location Part Location Part Description Description 43T00468 FRONT CABINET 43T47333 BONNET, 12.70 DIA(38NYV045H, 43T00459 LEFT CABINET 38NYV045M) 43T42336 ASM-BASE 43T00448 FIXING PLATE VALVE 43T00452 UPPER CABINET 43T00451 RIGHT CABINET ASSEMBLY 43T19332 FAN GUARD 43T46342 BODY-PMV 43T19330 PACKED VALVE COVER 43T63314 COIL-PMV 43T62325...
  • Page 114 FILE NO. SVM-07013 13-4. P.C. Board Layout Location Part Location Part Description Description 43T62320 HEATSINK(38NYV025H, 43T69657 PC BOARD(38NYV045M) 38NYV035H,38NYV035M) 43T60384 TERMINAL BLOCK,6P 43T62321 HEATSINKA(38NYV045H, 43T60326 FUSE 38NYV045M) 43T60377 TEMPERATURE SENSOR 43T69630 PC BOARD(38NYV025H) 43T50304 SENSOR;HEAT EXCHANGER 43T69631 PC BOARD(38NYV035H) 43T62313 BASE-PLATE-PC 43T69656 PC BOARD(38NYV035M)
  • Page 115 FILE NO. SVM-03005 TOSHIBA CARRIER (THAILAND) CO.,LTD. 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND. – 56 –...

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