Mitsubishi Electric PCA-RP71HA Service Manual
Series pca split-type, heat pump air conditioners
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- Service manual (36 pages) ,
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model names]
PCA-RP71HA
PCA-RP125HA
INDOOR UNIT
Model name
indication
TEMP.
REMOTE CONTROLLER
[Service Ref.]
PCA-RP71HA
PCA-RP71HA#1
PCA-RP125HA
PCA-RP125HA#1
ON/OFF
REVISED EDITION-B
Revision:
• PCA-RP71·125HA#1 are added
in REVISED EDITION-B.
• Some descriptions have been
modified.
• Please void OC329
REVISED EDITION-A.
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. TECHNICAL CHANGES .................................. 2
2. REFERENCE MANUAL ................................... 2
3. SAFETY PRECAUTION ................................... 3
4. PART NAMES AND FUNCTIONS .................... 7
5. SPECIFICATIONS ............................................ 9
6. NOISE CRITERION CURVES ........................ 10
7. OUTLINES AND DIMENSIONS ...................... 11
8. WIRING DIAGRAM ................................................ . 13
9. REFRIGERANT SYSTEM DIAGRAM .................... 14
10. TROUBLESHOOTING .................................... 15
11. SPECIAL FUNCTION ..................................... 26
12. DISASSEMBLY PROCEDURE ....................... 29
13. PARTS LIST .................................................... 33
14. RoHS PARTS LIST ......................................... 36
May 2008
No. OC329
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric PCA-RP71HA
Summary of Contents for Mitsubishi Electric PCA-RP71HA
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Page 1: Table Of Contents
No. OC329 REVISED EDITION-B SERVICE MANUAL Indoor unit Revision: • PCA-RP71·125HA#1 are added [Model names] [Service Ref.] in REVISED EDITION-B. • Some descriptions have been PCA-RP71HA modified. PCA-RP71HA PCA-RP71HA#1 • Please void OC329 REVISED EDITION-A. PCA-RP125HA PCA-RP125HA Note: PCA-RP125HA#1 • This manual describes only service data of the indoor units. -
Page 2: Technical Changes
TECHNICAL CHANGES PCA-RP71HA PCA-RP71HA#1 PCA-RP125HA PCA-RP125HA#1 INDOOR CONTROLLER BOARD(I.B.) has been changed. REFERENCE MANUAL 2-1. OUTDOOR UNIT’S SERVICE MANUAL Service Ref. Service Manual No. PUHZ-RP35/50/60/71/100/125/140VHA OC334 PUHZ-RP100/125/140YHA PUHZ-RP71/100/125/140VHA OC337 PUHZ-RP200/250YHA OC338 (1)(2) PUHZ-RP200/250YHA OC339 PU(H)-P • VGAA.UK OC336 PU(H)-P • YGAA.UK PUHZ-P100/125/140VHA.UK... -
Page 3: Safety Precaution
SAFETY PRECAUTION 3-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 3-2. 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 ·Only for R410A ·Use pressure performance of 5.09MPa·G or over.
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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 Displayed 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 as lit. 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-RP71HA, PCA-RP71HA#1 Cooling Heating Mode Power supply(phase, cycle, voltage) Single phase, 50Hz, 230V 0.09 0.09 Input Running current 0.43 0.43 0.86 0.86 Starting current External finish Stainless steel Heat exchanger Plate fin coil Fan(drive) x No. Sirocco fan (direct) x 2 Fan motor output 0.04... -
Page 10: Noise Criterion Curves
NOISE CRITERION CURVES PCA-RP125HA PCA-RP71HA NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High PCA-RP125HA#1 High PCA-RP71HA#1 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... -
Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS PCA-RP71HA Unit : mm PCA-RP71HA#1... - Page 12 Unit : mm PCA-RP125HA PCA-RP125HA#1...
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Page 13: Wiring Diagram
WIRING DIAGRAM PCA-RP71HA PCA-RP125HA PCA-RP71HA#1 PCA-RP125HA#1 [ LEGEND ] SYMBOL NAME SYMBOL NAME P. B INDOOR POWER BOARD MF1, MF2 FAN MOTOR I. B INDOOR CONTROLLER BOARD C1, C2 CAPACITOR(FAN MOTOR) FUSE FUSE (T6.3AL250V) DEW PREVENTION HEATER VARISTOR TERMINAL BLOCK(INDOOR UNIT... -
Page 14: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PCA-RP71HA PCA-RP71HA#1 PCA-RP125HA PCA-RP125HA#1 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) -
Page 15: Troubleshooting
TROUBLESHOOTING 10-1. 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 10-2. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause 1 Defective thermistor 1–3 Check resistance value of thermistor. Room temperature thermistor (TH1) 1 The unit is in 3-minute resume characteristics... - Page 17 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is work- (Cooling or drying mode) (Cooling or drying mode) 1 Clogged filter (reduced airflow) 1 Check clogs of the filter. 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove shields.
- Page 18 Abnormal point and detection method Countermeasure Error Code Cause 1 Defective thermistor 1–3 Check resistance value of thermistor. Pipe temperature thermistor / For characteristics, refer to (P1) above. Condenser-Evaporator (TH5) 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 Abnornal point and detection method Countermeasure Error Code Cause 1 Contact failure, short circuit or, Indoor/outdoor unit communication * 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
10-3. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure 1 Check the voltage of outdoor power (1)LED2 on indoor controller board • When LED1 on indoor controller board is also off. 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 10-5. HOW TO CHECK THE PARTS PCA-RP71HA PCA-RP71HA#1 PCA-RP125HA PCA-RP125HA#1 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>...
- Page 23 10-6. TEST POINT DIAGRAM 10-6-1. Power board PCA-RP71HA PCA-RP71HA#1 PCA-RP125HA PCA-RP125HA#1 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 10-6-2. Indoor controller board PCA-RP71HA PCA-RP71HA#1 PCA-RP125HA PCA-RP125HA#1 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 –...
- Page 25 For service board Model settings Service board MODELS Capacity 1 2 3 4 5 settings PCA-RP71HA 1 2 3 4 5 PCA-RP125HA <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 11-1. ROTATION FUNCTION(AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) For PCA-RP71/125HA#1 11-1-1. 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 11-1-2. 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-RP71HA PCA-RP125HA PCA-RP71HA#1 PCA-RP125HA#1 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 rail 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 reil (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 OPERATING PROCEDURE PHOTOS 9. Removing the guide vane Photo 13 Guide vane (1) Remove the oil filter. (See figure 1.) (2) Remove the 3 filter rails. (See photo 1, 4.) (3) Remove the under panel. (See photo 11.) (4) Remove the drain pan. (See photo 12.) (5) Remove the 3 screws (4 ×...
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Page 33: Parts List
PARTS LIST (non-RoHS compliant) STRUCTURAL PART PCA-RP71HA PCA-RP125HA Q'ty / set Wiring Recom- Remarks Specifications Parts No. Parts Name PCA-RP Diagram mended (Drawing No.) Symbol Q'ty 71HA 125HA R01 13N 809 LEG-L R01 13N 662 SIDE PLATE-L T7W E02 676... - Page 34 18,19 FAN PARTS PCA-RP71HA PCA-RP125HA Part numbers that are circled are not shown in the figure. Q'ty / set Wiring Recom- Remarks Specifications Parts No. Parts Name PCA-RP Diagram mended (Drawing No.) Symbol Q'ty 125HA 71HA R01 12N 110 T. CASING ASSY R01 13N 110 T.
- Page 35 ELECTRICAL PARTS PCA-RP71HA PCA-RP125HA 7, 8 TEMP. ON/OFF TO OUTDOOR TO REMOTE UNIT CONTROLLER Q'ty / set Wiring Recom- Remarks PCA-RP Parts No. Parts Name Specifications Diagram mended (Drawing No.) Symbol Q'ty 71HA 125HA R01 18J 054 SUPPORT T7W E41 310...
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Page 36: Rohs Parts List
RoHS PARTS LIST STRUCTURAL PART PCA-RP71/125HA PCA-RP71/125HA#1 Q'ty / set Wiring Recom- Remarks Parts No. Parts Name Specifications PCA-RP Diagram mended (Drawing No.) Symbol Q'ty 71HA 71HA#1 125HA#1 125HA LEG-L R01 14N 809 SIDE PLATE-L R01 14N 662 REAR PANEL T7W 14N 676 REAR PANEL T7W 15N 676... - Page 37 18,19 FAN PARTS PCA-RP71/125HA PCA-RP71/125HA#1 Part numbers that are circled are not shown in the figure. Q'ty / set Wiring Recom- Remarks Parts No. Parts Name Specifications PCA-RP Diagram mended (Drawing No.) Symbol Q'ty 71HA·71HA#1 125HA·125HA#1 R01 14N 110 T. CASING ASSY R01 15N 110 T.
- Page 38 ELECTRICAL PARTS PCA-RP71/125HA PCA-RP71/125HA#1 7, 8 TEMP. ON/OFF TO OUTDOOR TO REMOTE UNIT CONTROLLER Q'ty / set Wiring Recom- Remarks PCA-RP Parts No. Parts Name Specifications Diagram mended (Drawing No.) Symbol Q'ty 71HA 125HA#1 71HA#1 125HA R01 20J 054 SUPPORT T7W E51 310 CONTROLLER BOARD T7W E74 310...
- Page 40 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in May 2008 No.OC329 REVISED EDITION-B PDF 7 New publication, effective May 2008. Distributed in Jul. 2006 No.OC329 REVISED EDITION-A PDF 8 Specifications subject to change without notice.