Carrier 42NQ012N Service Manual
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Carrier 42NQ012N Service Manual

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FILE NO. SVM-10031
SERVICE MANUAL
AIR-CONDITIONER
SPLIT WALL TYPE
42NQ012N / 38NY012N
April, 2010

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Summary of Contents for Carrier 42NQ012N

  • Page 1 FILE NO. SVM-10031 SERVICE MANUAL AIR-CONDITIONER SPLIT WALL TYPE 42NQ012N / 38NY012N April, 2010...

  • Page 2: Table Of Contents

    FILE NO. SVM-10031 CONTENTS SPECIFICATIONS CONSTRUCTION VIEWS Indoor Unit Outdoor Unit WIRING DIAGRAM SPECIFICATION OF ELECTRICAL PARTS Indoor Unit Outdoor Unit REFRIGERANT CYCLE DIAGRAM CONTROL BLOCK DIAGRAM OPERATION DESCRIPTION Remote control Outline of Air Conditioner Control Description of Operation Mode Description of Safety and Reliability Prevention Function Hi POWER operation ECO operation...
  • Page 3 FILE NO. SVM-10031 10. PARTS REPLACE THE MAIN PARTS 11-1 Indoor Unit 11-2 Microcomputer 11-3 Outdoor Unit 11. EXPLODED VIEWS AND PARTS LIST 11-1 Indoor Unit (E-Parts Assy) 11-2 Indoor Unit 11-3 Outdoor Unit 11-4 Outdoor Unit (E-Parts Assy) − 2 −...

  • Page 4: Specifications

    FILE NO. SVM-10031 1. SPECIFICATIONS MODEL 42NQ012N/38NY012N ITEM Cooling Heating 220V 240V 220V 240V Capacity 3.70 3.74 4.10 4.20 Phase 1∅ 220 − 240 Power source 1.14 Power consumption 1.18 1.13 1.17 Power factor Running Indoor 0.15 current Outdoor 5.20 5.45...
  • Page 5 FILE NO. SVM-10031 Note : 1 • Capacity is based on the following temperature conditions. JIS C9612 Condition Temperature Cooling Heating (DB) 27°C 20°C Indoor unit inlet air temperature (WB) 19°C 15°C (DB) 35°C 7°C Outdoor unit inlet air temperature (WB) 24°C 6°C...

  • Page 6: Construction Views

    FILE NO. SVM-10031 2.CONSTRUCTION VIEWS 2-1. Indoor Unit < > Air filter Heat exchanger Air inlet Front panel Knock out system Knock out system 65 68 Installation plate hanger Wireless remote controller Installation plate hanger Drain hose (0.50m) Connecting pipe (0.35m) Connecting pipe (0.40m) (Flare ∅12.70mm) (Flare...

  • Page 7: Outdoor Unit

    FILE NO. SVM-10031 2.2. 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 8: Wiring Diagram

    FILE NO. SVM-10031 3. WIRING DIAGRAM OUTDOOR OUTDOOR TERMINAL BLOCK CHASSIS SOLENOID COIL SOLENOID COIL CAPACITOR CAPACITOR COMPRESSOR COMPRESSOR MOTOR MOTOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR − 7 −...

  • Page 9: Specification Of Electrical Parts

    FILE NO. SVM-10031 4. SPECIFICATION OF ELECTRICAL PARTS 4-1. Indoor Unit Parts name Type Specifications Fan motor (for indoor) AFN-220-20-4D AC Motor with 145 C thermo fuse ° Thermo sensor (TA-sensor) 10k at 25 C ° Power Module (M01) GPS-9W-AA DC370V, Secondary DC13V Microcontroller unit (IC30) TMP87CM40ANG-6P68...

  • Page 10: Refrigeration Cycle Diagram

    FILE NO. SVM-10031 5. REFRIGERATION CYCLE DIAGRAM Indoor unit Heat exchanger Cooling 0.39m 0.49m Heating (Connecting pipe) (Connecting pipe) ∅12.7 ∅6.35 Cross flow fan O.D.:12.7mm O.D.:6.35mm Packed valve Packed valve (∅12.7) (∅6.35) Heating Cooling 4-way valve Heating Cooling Compressor PA145G1C-4FT1 Capillary tube Capillary tube ∅1.2x500l...

  • Page 11: Control Block Diagram

    FILE NO. SVM-10031 6. CONTROL BLOCK DIAGRAM Main Unit Control Panel M.C.U. Operation Heat Exchange sensor Functions Display Timer • Louver Control Thermo. Sensor Display Filter Sign • 3-minutes Delay at Restart Current Sensor Display for Compressor (Compressor Current) Hi Power Infrared Rays Signal Reciver Sign Display •...

  • Page 12: Operation Description

    FILE NO. SVM-10031 7. OPERATION DESCRIPTION 7-1. Remote control 7-1-1. Remote control and its functions Infrared signal emitter Start/Stop button ( Mode select button ( Temperature button ( Fan speed button ( PRESET Swing louver button ( MODE Set louver button ( On timer button ( Off timer button ( OF F...
  • Page 13 FILE NO. SVM-10031 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). 6.
  • Page 14 FILE NO. SVM-10031 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 15 FILE NO. SVM-10031 7-1-3. 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 16: Outline Of Air Conditioner Control

    FILE NO. SVM-10031 • Turning off the compressor and outdoor fan 7-2. Outline of Air Conditioner Control when the outdoor unit receives the shutdown This is a fixed capacity type air conditioner, which uses command a AC motor for an indoor fan. The AC motor drive •...

  • Page 17: Description Of Operation Mode

    FILE NO. SVM-10031 7-3-2. Cooling operation 7-3. Description of Operation Mode ([MODE] button on the remote control is set (1) When turning on the breaker, the operation lamp to the cooling operation.) blinks. This means that the power is on (or the (1) The compressor, 4-way valve, outdoor fan and power supply is cut off.) operation display lamp are controlled as shown in...
  • Page 18 FILE NO. SVM-10031 7-3-3. Dry operation 7-3-4. Heating operation ([MODE] button on the remote control is set ([MODE] button on the remote control is set to the dry operation.) to the heating operation.) (1) The compressor, 4-way valve, outdoor fan and (1) The compressor, 4-way valve, outdoor fan and operation display lamp are controlled as shown in operation display lamp are controlled as shown in...

  • Page 19: Cooling Operation

    FILE NO. SVM-10031 (3) The indoor heat exchanger restricts revolving 7-3-5. Automatic operation speed of the fan motor to prevent a cold draft. The ([MODE] button on the remote control is set upper limit of the revolving speed is shown in to the automatic operation.) Fig.

  • Page 20: Description Of Safety And Reliability Prevention Function

    FILE NO. SVM-10031 7-4. Description of Safety and Reliability Prevention Function 7-4-1. High-Temperature Limit Control 7-4-3. Defrost Operation The microcontroller detects the indoor heat exchanger temperature to prevent pressure of a refrigerating cycle During the heating operation, the outdoor heat from increasing excessively.
  • Page 21 FILE NO. SVM-10031 minutes minutes minutes minutes Max 6 minutes 10 minutes 1 cycle Fig. 7-4-4 <In case of C> (1) The heating operation is performed for at least 90 minutes. (2) The defrost operating time is 10 minutes. Ending condition at defrost operation (1) When the compressor current becomes 5.10A or more during defrost operation, the defrost operation stops and the heating operation restarts.
  • Page 22 FILE NO. SVM-10031 7-4-4. Current Limit Control The microcontroller detects the input current so as to prevent it exceeds a specified value by means of controlling the outdoor fan control as described in (1) and (2). (1) Current limit control (Cooling operation) Control is performed as shown below by detecting the compressor operating current with a current sensor (C.T).

  • Page 23: Eco Operation

    FILE NO. SVM-10031 7-5. Hi POWER Mode 7-6. ECO Operation ([Hi POWER] button on the remote Cooling operation control is pressed.) · The preset temperature will increase 1ºC after the ECO mode has operated for 1 hour and the temperature When [Hi POWER] button is pressed while the indoor will increase another 1ºC after the ECO mode has unit is in Auto, Cooling or Heating operation, Hi...

  • Page 24: Auto Restart Function

    FILE NO. SVM-10031 7-8. 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 25 FILE NO. SVM-10031 7-8-2. 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 26: Installation Procedure

    FILE NO. SVM-10031 8. INSTALLATION PROCEDURE 8-1. Safety Cautions For general public use Power supply cord of parts of appliance for outdoor use shall be at least polychloroprene sheathed flexible cord (design H07RN-F), or cord designation 245 IEC66. (1.5 mm or more).
  • Page 27 Also, make sure the equipment is properly earthed. • Appliance shall be installed in accordance with national wiring regulations. If you detect any damage, do not install the unit. Contact your Carrier dealer immediately. CAUTION • Exposure of unit to water or other moisture before installation could result in electric shock.

  • Page 28: Installation Diagram Of Indoor And Outdoor Units

    FILE NO. SVM-10031 8-2. 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. Cut the piping Shield pipe hole sloped...

  • Page 29: Installation

    FILE NO. SVM-10031 8-3. Installation 8-3-1. Optional installation parts Part Parts name Q'ty Code Refrigerant piping Liquid side : ∅6.35 mm each ∅ Gas side 12.70 mm Pipe insulating material (polyethylene foam, 6 mm thick) Putty, PVC tapes each <Fixing bolt arrangement of outdoor unit> 108 mm 125 mm 28 mm...
  • Page 30 FILE NO. SVM-10031 8-3-2. Accessory and installation parts Part Part Part Part name (Q’ty) Part name (Q’ty) Part name (Q’ty) Mounting screw ∅4 x 25 x 6 Installation plate x 1 Remote control holder x 1 Pan head wood screw ∅...
  • Page 31 FILE NO. SVM-10031 8-3-3. 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 32: Indoor Unit

    FILE NO. SVM-10031 8-4-2. Cutting a hole and mounting installation 8-4. Indoor Unit plate 8-4-1. 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 33 FILE NO. SVM-10031 <When the installation plate is directly mounted on 8-4-3. 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 34 FILE NO. SVM-10031 8-4-4. Wiring connection Air inlet grille <How to connect the connecting cable> Front panel Wiring of the connecting cable can be carried out without removing the front panel. 1. Remove the air inlet grille. Open the air inlet grille upward and pull it toward Earth line you.
  • Page 35 FILE NO. SVM-10031 <How to fix the Drains Cap> 8-4-5. Piping and drain hose installation 1) Insert hexagonal wrench (∅4 mm) in a center head. <Piping and Drain Hose Forming> * Since dewing results in a machine trouble, make sure to insulate both the connecting pipes. (Use polyethylene foam as insulating material.) ∅4 mm Rear right...
  • Page 36 FILE NO. SVM-10031 <Left-hand connection with piping> 8-4-6. Indoor unit fixing Bend the connecting pipe so that it is laid within 43 mm above the wall surface. If the connecting pipe is laid 1. Pass the pipe through the hole in the wall, and hook exceeding 43 mm above the wall surface, the indoor the indoor unit on the installation plate at the upper unit may unstably be set on the wall.

  • Page 37: Outdoor Unit

    FILE NO. SVM-10031 8-5. Outdoor Unit 2. Put water in the drain pan and make sure that the water is drained out of doors. 8-5-1. Installation Place 3. When connecting extension drain hose, insulate the • A place which provides enough space around the connecting part of extension drain hose with shield outdoor unit as shown in the diagram.
  • Page 38 FILE NO. SVM-10031 8-5-2. Refrigerant Piping Connection <Tightening Connection> Align the centers of the connecting pipes and tighten <Flaring> the flare nut as much as possible with your fingers. 1. Cut the pipe with a pipe cutter. Then tighten the nut with a wrench and torque wrench as shown in the figure.
  • Page 39 FILE NO. SVM-10031 8-5-3. Evacuating CAUTION After the piping has been connected to the indoor unit, perform the air purge. • KEEP IMPORTANT 5 POINTS FOR PIPING WORK 1. Take away dust and moisture (inside of the AIR PURGE connecting pipes). 2.
  • Page 40 FILE NO. SVM-10031 Revised 8-5-5. Remote Controller A or B Selection Stripping length of connecting cable Setting When two indoor units ae installed in seperated rooms, Terminal block there is no need to change the selector switch. Terminal screw 1(L) 2(N) <Remote control selector switch>...
  • Page 41 FILE NO. SVM-10031 8-6. Test Operation 8-6-1. Gas Leak Test 8-6-3. Auto Restart Setting This product is designed so that, after a power failure, it can restart automatically in the same Check places for operating mode as before the power failure. the indoor unit.

  • Page 42: Troubleshooting Chart

    FILE NO. SVM-10031 9. TROUBLESHOOTING CHART 9-2-2. Incorrect cable connection between Indoor 9-1. Troubleshooting Procedure and outdoor units Follow the details of 9-2. Basic Check Items. The indoor unit is connected to the outdoor unit with If there is no troub le corresponding to 9-2, check 5 cables (Heat pump model) or 3 cables (Cooling Only whether or not there are faulty parts following model).

  • Page 43: Primary Judgement

    FILE NO. SVM-10031 9-3-2. Failure diagnosis 9-3. Primary Judgement The indoor unit diagnoses the operation condition and 9-3-1. Role of indoor unit controller indicates the information of the self-diagnosis with the The indoor unit controller receives the operation lamps on the display panel of the indoor unit. commands from the remote control and executes them.

  • Page 44: Self-Diagnosis By Remote Control (Check Code)

    FILE NO. SVM-10031 9-4. Self-Diagnosis by Remote Controller (Check Code) 1. If the lamps are indicated as shown B to G in Table 9-3-1, 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 45 FILE NO. SVM-10031 Table 9-4-1 Block level Diagnosis function Judgement and action Check Check Block Symptom Conditioner Condition code code status Indoor Thermo. sensor Indicated Continued 1.Check thermo sensor. P.C. board short/break. when detected operation. 2.If it is OK, check abnormal P.C.

  • Page 46: Troubleshooting Flowcharts

    FILE NO. SVM-10031 9-5. Troubleshooting Flowcharts 9-5-1. Power can not be turned on (No operation at all) <Preliminary checks> Operation (1) Is the supply voltage normal? (2) Is the connection to the AC output OK.? Check Items Main cause Shut off the power supply from AC outlet once and Countermeasure turn it on after 5 seconds.
  • Page 47 FILE NO. SVM-10031 9-5-2. Power can not be turned on after replacing indoor P.C. board <Checking Procedure> Connect the AC Power supply Return the wiring of the Does the OPERATION Is it wired as shown power relay is returned to lamp blink? in Figure below? the normal procedure.
  • Page 48 FILE NO. SVM-10031 9-5-3. Outdoor unit does not operate Shut off the power supply from AC outlet once and turn it on after 5 seconds. Does the OPERATION lamp blink? See "Power can not be turned on". Does the power turn on by pushing See "Power can not be turned on".
  • Page 49 FILE NO. SVM-10031 9-5-4. Only compressor does not operate Shut off the power supply from AC outlet once and turn it on after 5 seconds. Does the OPERATION lamp blink? See "Power can not be turned on". Does the power turn on by See "Power can not be turned on".
  • Page 50 FILE NO. SVM-10031 9-5-5. Only outdoor fan does not operate Shut off the power supply from AC outlet once and turn it on after 5 seconds. Does the OPERATION lamp blink? See "Power can not be turned on". Does the power turn on by See "Power can not be turned on".
  • Page 51 FILE NO. SVM-10031 9-5-6. Only 4-Way valve does not operate (During heating operation) Shut off the power supply from AC outlet once and turn it on after 5 seconds. Does the OPERATION lamp blink? See "Power can not be turned on". Does the power turn on by See "Power can not be turned on".
  • Page 52 FILE NO. SVM-10031 9-5-7. Only the indoor fan does not operate <Check procedure> Shut off the power supply once. Turn the power supply. Does the fan stop in Replace the P.C. board. Control P.C. board is defective. no operating status? Start the operation with low fan setting in cool operation.

  • Page 53: Troubleshooting For Remote Control (Including The Indoor P.c. Board)

    FILE NO. SVM-10031 9-6. Troubleshooting for Remote Control (Including the Indoor P.C. Board) <Primary check> Check that A or B selected on the main unit is matched with A or B selected on the remote controller. There is no beep from the indoor unit Push the [ ] button.
  • Page 54 FILE NO. SVM-10031 9-6-1 How to check the P.C. board (2) Inspection procedres 1) When a P.C. board is judged to be defective, (1) Operating precautions check for disconnection, burning, or discolora- 1) When removing the front panel or the P.C. board, tion of the copper foil pattern or this P.C.
  • Page 55 FILE NO. SVM-10031 (3) Checking procedure Table 9-6-1 Procedure Check Point (Symptom) Causes 1. • Application of shock voltage. Shut off the power supply and 1. Is the fuse blown? • Overload by short-circuit of the remove the P.C. board assembly from the electronic parts base.
  • Page 56 FILE NO. SVM-10031 Table 9-6-2 App ximate resistance alue of thermo sensor (kΩ) empe ature °C 20°C 30°C 25°C 10°C Resistance v alue 33.8 20.35 12.59 10.00 7.99 9-6-2. How to shorten time of restart delay timer (1) Set the operation mode, temperature, and air flow rate to be applied with the timer short mode.

  • Page 57: How To Replace The Main Parts

    FILE NO. SVM-10031 10. 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 58 FILE NO. SVM-10031 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 59 FILE NO. SVM-10031 Part name Procedures Remarks ‚ ‚ Electric parts 1) Follow the procedure up to 3) in above. box assembly 2) Remove screw of earth lead attached to the end plate of the evaporator. 3) 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 60 FILE NO. SVM-10031 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.) „ ƒ 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 61 FILE NO. SVM-10031 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 62 FILE NO. SVM-10031 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 63 FILE NO. SVM-10031 Part name Procedures Remarks ‡ Cross flow fan <Caution at reassembling> Fan motor D shaft Double point set screw 1) To incorporate the fan motor incorporate the motor into the position in the following figure, and then install the fan motor. •...
  • Page 64 FILE NO. SVM-10031 10-2. Outdoor Unit Part name Procedures Remarks 2-Screws Ø4 x 16L Common Cord clamp 1) Stop the operation of air-conditioner, and procedure disconnect the power cord from the AC supply. 2) Remove packed valve cover and Electric parts cover.

  • Page 65: Exploded Views And Parts List

    FILE NO. SVM-10031 11. EXPLODED VIEWS AND PARTS LIST 11-1. Indoor Unit (E-Parts Assy) Location Part Location Part Description Description 43T60385 TERMINAL BLOCK ; 2P 43T69641 PC BOARD ASSY; WRS-LED 43T60365 TERMINAL BLOCK; 3P (Made in Thailand) 43T69004 SENSOR;HEAT EXCHANGER 43T60077 FUSE, TEMPERATURE, 73C 43T69005...
  • Page 66 FILE NO. SVM-10031 11-2. Indoor Unit Location Part Location Part Description Description 43T21397 LOUVER MOTOR (Made in Thailand) 43T39328 MOTOR BAND (LEFT) (Made in Thailand) 43T21409 FAN MOTOR (Made in Thailand) 43T39329 MOTOR BAND (RIGHT) (Made in Thailand) 43T22312 BEARING ASSY, MOLD (Made in Thailand) 43T09409 HORIZONTAL LOUVER (Made in Thailand) 43T70313...
  • Page 67 FILE NO. SVM-10031 11-3. Outdoor Unit Location Part Location Part Description Description 43T42328 BASE PLATE ASSEMBLY 43T19332 FAN GUARD 43T41435 COMPRESSOR 43T04301 PARTITION 43T49008 CUSHION,RUBBER 43T39333 MOTOR BASE CONNECTION PLATE 43T97001 43T39318 MOTOR BASE 43T43383 CONDENSER ASSEMBLY 43T19330 PACKED VALVE COVER 43T00448 FIXING PLATE VALVE 43T00460...
  • Page 68 FILE NO. SVM-03008 – 87 –...

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