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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model names]
PCA-RP71HAQ
PCA-RP125HAQ
INDOOR UNIT
Model name
indication
TEMP.
REMOTE CONTROLLER
(Option)
[Service Ref.]
PCA-RP71HAQ
PCA-RP125HAQ
ON/OFF
Note:
• This manual describes only
service data of the indoor units.
• RoHS compliant products have
<G> mark on the spec name
plate.
• For servicing of RoHS com-
pliant products, refer to the
RoHS Parts List.
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PART NAMES AND FUNCTIONS .................... 7
4. SPECIFICATIONS ............................................ 9
5. NOISE CRITERION CURVES ........................ 10
6. OUTLINES AND DIMENSIONS ...................... 11
7. WIRING DIAGRAM ............................................. 13
8. REFRIGERANT SYSTEM DIAGRAM ............. 14
9. TROUBLESHOOTING .................................... 15
10. SPECIAL FUNCTION ..................................... 26
11. DISASSEMBLY PROCEDURE ....................... 29
PARTS CATALOG (OCB492)
December 2010
No. OCH492
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Table of Contents
Troubleshooting
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Summary of Contents for Mitsubishi Electric PCA-RP71HAQ
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Page 1: Table Of Contents
SPLIT-TYPE, AIR CONDITIONERS December 2010 No. OCH492 SERVICE MANUAL Indoor unit [Model names] [Service Ref.] Note: PCA-RP71HAQ • This manual describes only PCA-RP71HAQ service data of the indoor units. • RoHS compliant products have PCA-RP125HAQ PCA-RP125HAQ <G> mark on the spec name plate. -
Page 2: Reference Manual
REFERENCE MANUAL 1-1. OUTDOOR UNIT’S SERVICE MANUAL Service Ref. Service Manual No. PUHZ-RP71VHA4 OCH451 PUHZ-RP125/140VKA OCB451 PUHZ-RP125/140/250YKA PU(H)-P71VHAR3.UK OC379 PU(H)-P71/125/140YHAR3.UK PUHZ-P125/140VHA3R2.UK OCH415 / OCB415 PUHZ-P125/140YHAR1.UK PUHZ-P250YHA3R2 OCH424 / OCB424 1-2. TECHNICAL DATA BOOK Series (Outdoor unit) Manual No. PUHZ-RP • HA4 OCS16 PUHZ-RP •... -
Page 3: Safety Precaution
SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R407C Do not use the existing refrigerant piping. Use liquid refrigerant to charge the system. The old refrigerant and lubricant in the existing piping If gas refrigerant is used to seal the system, the composition contains a large amount of chlorine which may cause the... - Page 4 [1] Cautions for service · After recovering the all refrigerant in the unit, proceed to working. · Do not release refrigerant in the air. · After completing the repair service, recharge the cycle with the specified amount of liquid refrigerant. [2] Refrigerant recharging (1) Refrigerant recharging process 1Direct charging from the cylinder.
- Page 5 CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R410A Use new refrigerant pipes. Do not use refrigerant other than R410A. In case of using the existing pipes for R22, be careful with If other refrigerant (R22 etc.) is used, chlorine in refrige- the followings.
- Page 6 Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant. Tool name Specifications Gauge manifold · Only for R410A · Use the existing fitting specifications . (UNF1/2) · Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·...
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Page 7: Part Names And Functions
PART NAMES AND FUNCTIONS Indoor (Main) Unit Left/right guide vanes Change the direction of airflow Air outlet from the horizontal blower. Oil filter (Air intake) It prevents oil from Up/down guide vanes getting into the unit. Change the direction of airflow from the Air intake vartical blower. - Page 8 Display “Sensor” indication Displays when the remote controller sensor is used. Day-of-Week For purposes of this explanation, Shows the current day of the week. all parts of the display are shown. During actual operation, only Time/Timer Display the relevant items will be lit. “Locked”...
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Page 9: Specifications
SPECIFICATIONS Service Ref. PCA-RP71HAQ Mode Cooling Heating Power supply(phase, cycle, voltage) Single phase, 50Hz, 230V Input 0.09 0.09 Running current 0.43 0.43 Starting current 0.86 0.86 External finish Stainless steel Heat exchanger Plate fin coil Fan(drive) × No. Sirocco fan (direct) × 2 Fan motor output 0.04... -
Page 10: Noise Criterion Curves
NOISE CRITERION CURVES PCA-RP125HAQ PCA-RP71HAQ NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR NC-20 HEARING FOR NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000... -
Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS PCA-RP71HAQ Unit : mm... - Page 12 Unit : mm PCA-RP125HAQ...
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Page 13: Wiring Diagram
WIRING DIAGRAM PCA-RP71HAQ PCA-RP125HAQ [LEGEND] Check code Symptom SYMBOL NAME SYMBOL NAME P. B INDOOR POWER BOARD MF1, MF2 FAN MOTOR Abnormality of room temperature thermistor TH1) I. B INDOOR CONTROLLER BOARD C1, C2 CAPACITOR (FAN MOTOR Abnormality of pipe temperature thermistor/Liquid... -
Page 14: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PCA-RP71HAQ PCA-RP125HAQ Strainer Heat exchanger Refrigerant GAS pipe connection (Flare) Condenser/evaporator temperature thermistor (TH5) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Pipe temperature thermistor/liquid Room temperature (TH2) thermistor (TH1) Strainer Distributor... -
Page 15: Troubleshooting
TROUBLESHOOTING 9-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit. Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents below before investigating details. -
Page 16: Self-Diagnosis Action Table
Note: Refer to the manual of outdoor unit for the details of display 9-2. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause Room temperature thermistor (TH1) 1 Defective thermistor 1–3 Check resistance value of thermistor. - Page 17 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is oper- (Cooling or drying mode) (Cooling or drying mode) ating 1 Clogged filter (reduced airflow) 1 Check clogs of the filter. 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove blockage.
- Page 18 Abnormal point and detection method Countermeasure Error Code Cause Pipe temperature thermistor / 1 Defective thermistor 1–3 Check resistance value of thermistor. Condenser-Evaporator (TH5) For characteristics, refer to (P1) above. characteristics 2 Check contact failure of connector (CN44) 1 The unit is in 3-minute resume protec- 2 Contact failure of connector on the indoor controller board.
- Page 19 Abnormal point and detection method Countermeasure Error Code Cause Indoor/outdoor unit communication 1 Contact failure, short circuit or, * Check LED display on the outdoor control error (Signal receiving error) circuit board. (Connect A-control service miswiring (converse wiring) of 1 Abnormal if indoor controller board tool, PAC-SK52ST.) indoor/outdoor unit connecting cannot receive any signal normally for 6...
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Page 20: Troubleshooting By Inferior Phenomena
9-3. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (1)LED2 on indoor controller board • When LED1 on indoor controller board is also off. 1 Check the voltage of outdoor power 1 Power supply of rated voltage is not supplied to out- supply terminal block (L, N) or (L3, N). - Page 21 Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (2)LED2 on indoor controller board • When LED1 on indoor controller board is also blinking. Check indoor/outdoor unit connecting wire Connection failure of indoor/outdoor unit connecting for connection failure.
- Page 22 9-5. HOW TO CHECK THE PARTS PCA-RP71HAQ PCA-RP125HAQ Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) (At the ambient temperature 10 ~30 ) Pipe temperature thermistor (TH2) Normal Abnormal (Refer to <Thermistor Characteristic graph> for a detail.) Condenser/Evaporator 4.3k ~9.6k...
- Page 23 9-6. TEST POINT DIAGRAM 9-6-1. Power board PCA-RP71HAQ PCA-RP125HAQ CN2S Connect to the indoor controller board (CN2D) Between 1 to 3 12.6-13.7V DC (Pin1 (+)) CNSK Connect to the indoor controller board (CNDK) Between 1 to 3 220-240V AC...
- Page 24 9-6-2. Indoor controller board PCA-RP71HAQ PCA-RP125HAQ CN2D LED1 LED3 Connector to the indoor LED2 Power supply Transmission power board (CN2S) Power supply (I.B) (Indoor/outdoor) (12.5~13.7V DC) (R.B) CN3C Transmission – (Indoor/outdoor) (0~24V DC) CN22 Remote controller connecting wire – (10.4~14.6V DC)
- Page 25 For service board Model settings Service board MODELS Capacity 1 2 3 4 5 settings PCA-RP71HAQ 1 2 3 4 5 PCA-RP125HAQ <Initial setting> Wireless remote controller: 0 Control PCB setting Wireless remote Control PCB: (for both J41 and J42)
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Page 26: Special Function
SPECIAL FUNCTION 10-1. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) 10-1-1. Operation (1) Rotation function (and Back-up function) • Outline of functions · Main and sub unit operate alternately according to the interval of rotation setting. w Main and sub unit should be set by refrigerant address. (Outdoor Dip switch setting) Refrigerant address "00"... - Page 27 10-1-2. How to set rotation function (Back-up function, 2nd stage cut-in function) You can set these functions by wired remote controller. (Maintenance monitor) NOTICE Both main and sub unit should be set in same setting. Every time replacing indoor controller board for servicing, the function should be set again. (1) Request Code List Rotation setting Setting No.
- Page 28 (2) Setting method of each function by wired remote controller B: Refrigerant address C: Data display area D: Request code display area 1. Stop operation( ). 2. Press the button ( ) for 3 seconds so that [Maintenance mode] appears on the screen ( ). TEST After a while, [00] appears in the refrigerant address number display area.(at 3.
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Page 29: Disassembly Procedure
DISASSEMBLY PROCEDURE PCA-RP71HAQ PCA-RP125HAQ OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 1. Removing the oil filter Figure 1 (1) Slide the oil filter towards you to remove. (See Figure 1) Oil filter Photo 1 2. Removing the terminal block box cover Filter rails Fan guard (1) Remove the oil filter. - Page 30 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 4. Removing the fan motor Photo 4 (1) Remove the oil filter. (See Figure 1) (2) Remove the control box cover. (See Photo 2) Filter rail (3) Remove the room temperature thermistor connector (CN20) on the indoor controller board. (See Photo 3) (4) Remove a filter rail that is the nearest to the control box.
- Page 31 OPERATING PROCEDURE PHOTOS 6. Removing the pipe temperature thermistor Photo 8 Relay connector (1) Remove the oil filter. (See Figure 1) (2) Remove the fan guard. (See Photo 1) (3) Remove the terminal block box cover. (4) Remove the white relay connector (2P) in the terminal block box.
- Page 32 Heat exchanger (left) HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Dec. 2010 CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Specifications subject to change without notice. Distributed in Dec. 2010 No.OCH492 Made in Japan...
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