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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model names]
PMH-P25BA
PMH-P35BA
PMH-P50BA
INDOOR UNIT
TEMP.
REMOTE CONTROLLER
[Service Ref.]
PMH-P25BA
PMH-P35BA
PMH-P50BA
ON/OFF
NOTE:
• This manual describes only
CONTENTS
1. REFERENCE MANUAL ······································2
2. SAFETY PRECAUTION···································2
3. PART NAMES AND FUNCTIONS ···················4
4. SPECIFICATIONS ············································6
5. NOISE CRITERION CURVES ··························7
6. OUTLINES AND DIMENSIONS ·······················8
7. WIRING DIAGRAM··············································9
8. REFRIGERANT SYSTEM DIAGRAM ··················10
9. TROUBLESHOOTING ···································11
10. DISASSEMBLY PROCEDURE ······················22
11. PARTS LIST ···················································25
July 2005
No. OC333
service data of the indoor
units.
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Table of Contents
Related Manuals for Mitsubishi Electric Mr.Slim PMH-P25BA
Summary of Contents for Mitsubishi Electric Mr.Slim PMH-P25BA
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS July 2005 No. OC333 SERVICE MANUAL Indoor unit NOTE: [Model names] [Service Ref.] • This manual describes only service data of the indoor PMH-P25BA units. PMH-P25BA PMH-P35BA PMH-P35BA PMH-P50BA PMH-P50BA CONTENTS 1. REFERENCE MANUAL ······································2 2. -
Page 2: Reference Manual
REFERENCE MANUAL 1-1. OUTDOOR UNIT’S SERVICE MANUAL Service Manual No. Service Ref. PU(H)-P·VGAA.UK OC336 PU(H)-P·YGAA.UK 1-2. TECHNICAL DATA BOOK Manual No. Series (Outdoor unit) PU(H)-P·VGAA.UK OCS02 PU(H)-P·YGAA.UK SAFETY PRECAUTION CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R407C Do not use the existing refrigerant piping. - Page 3 [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.
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Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS Indoor Unit Auto Air Swing Vane Guide vane Disperses airflow up and Air flow can be changed to horizontally down and adjusts the angle by moving the Guide vane to the left or right. of airflow direction. Horizontal Air Outlet Filters Air intake... - Page 5 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 6: Specifications
SPECIFICATIONS Service Ref. PMH-P25BA Cooling Mode Heating Power supply(phase, cycle, voltage) Single phase, 50Hz, 230V 0.04 0.04 Input Running current 0.19 0.19 0.21 Starting current 0.21 External finish Unit : Galvanized sheets with gray heat insulation, Grille munsell 0.98Y 8.99/0.63 Heat exchanger Plate fin coil Fan(drive) o No. -
Page 7: Noise Criterion Curves
NOISE CRITERION CURVES PMH-P25BA PMH-P35BA SPL(dB) LINE SPL(dB) LINE NOTCH NOTCH High High Medium1 Medium1 Medium2 Medium2 NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE THRESHOLD OF APPROXIMATE THRESHOLD OF HEARING FOR NC-20 NC-20 HEARING FOR CONTINUOUS CONTINUOUS NOISE NOISE... -
Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS PMH-P25BA Unit : mm PMH-P35BA PMH-P50BA... -
Page 9: Wiring Diagram
WIRING DIAGRAM PMH-P25BA PMH-P35BA PMH-P50BA [LEGEND] NOTES: SYMBOL NAME INDOOR CONTROLLER BOARD 1.Since the outdoor side electric wiring may change be sure CN2L CONNECTOR(LOSSNAY) to check the outdoor unit electric wiring for servicing. CN32 CONNECTOR(REMOTE SWITCH) 2.Indoor and outdoor connecting wires are made with polarities, CN41 CONNECTOR(HA TERMINAL-A) make wiring matching terminal numbers (S1, S2, S3). -
Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit : mm PMH-P25BA PMH-P35BA PMH-P50BA 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 11: 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 inferior phenomenon reoccurrence at field are summarized in the table below. Check the contents below before investigating details. - Page 12 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. Error Code Meaning of error code and detection method Countermeasure Cause 1 Defective thermistor 1–3 Check resistance value of thermistor. Abnormality of room temperature thermistor (TH1) characteristics.
- Page 13 Error Code Meaning of error code and detection method Countermeasure Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) working 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 14 Error Code Meaning of error code and detection method Countermeasure Cause Abnormality of pipe temperature ther- 1 Defective thermistor 1–3 Check resistance value of thermistor. mistor / Condenser-Evaporator (TH5) For characteristics, refer to (P1) above. characteristics 2 Check contact failure of connector (CN29) 1 The unit is in three-minute resume pro- 2 Contact failure of connector on the indoor controller board.
- Page 15 Error Code Meaning of error code and detection method Countermeasure Cause ∗ Check LED display on the outdoor control cir- Indoor/outdoor unit communication 1 Contact failure, short circuit or, error (Signal receiving error) cuit board. (Connect A-control service tool, mis-wiring (converse wiring) of 1 Abnormal if indoor controller board PAC-SK52ST.) indoor/outdoor unit connecting...
- Page 16 9-3. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Factor Countermeasure (1)LED2 on indoor controller board • When LED1 on indoor controller board is also off. 1 Power supply of 220~240V is not supplied to outdoor 1 Check the voltage of outdoor power is off.
- Page 17 9-4. WHEN WIRED REMOTE CONTROLLER OR INDOOR UNIT MICRO COMPUTE TROUBLES 1. If there is not any other wrong when trouble occurs, emergency operation starts as the indoor controller board switch (SWE) is set to ON. During the emergency operation the indoor unit is as follows; (1) Indoor fan high speed operation (2) Drain-up machine operation 2.
- Page 18 Check method of indoor fan motor (fan motor / control p.c.board) Notes · High voltage is applied to the connecter (FAN) for the fan motor. Give attention to the service. · Do not pull out the connector (Fan) for the motor with the power supply on. (It causes trouble of the control p.c.board) Self check...
- Page 19 <Thermistor Characteristic graph> Room temperature thermistor(TH1) Thermistor for < Thermistor for lower temperature > Pipe temperature thermistor(TH2) lower temperature Condenser/evaporator temperature thermistor(TH5) Thermistor R =15kΩ ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+t 15kΩ 9.6kΩ 6.3kΩ 5.4kΩ...
- Page 20 9-6. TEST POINT DIAGRAM Indoor controller board PMH-P25BA PMH-P35BA PMH-P50BA CN22 CN90 CN32 Connect to the terminal block (TB5) Connect to the wireless Connector (Remote controller connecting wire) remote controller board (Remote switch) (10~16V DC) – + CN31 Drain sensor (DS) CN20 Room temperature thermistor (TH1)
- Page 21 9-7. FUNCTIONS OF JUMPER WIRE Each function is controlled by the jumper wire on control p.c. board. For service parts, J11- J15 and J21-J24, DIP switches (SW1 and SW2) are equipped with jumper wire. (Marks in the table below) Jumper wire ( : Short : Open) DIP switch...
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Page 22: Disassembly Procedure
DISASSEMBLY PROCEDURE PMH-P25BA PMH-P35BA Be careful on removing heavy parts. PMH-P50BA OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS Photo 1 1. Removing the intake grille Opening the air intake grille (1) Press the of the air intake grille.(See figure 1) PUSH (2) Put your figure on the both end of nut of the air intake grille and put it down after the grille clicked. - Page 23 OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS Photo 2 2. Removing the electrical parts box Claw in middle Stabilizer Electrical parts of stabilizer (1) Remove the panel. (2) Remove the cover. (3) Remove the electrical parts cover. (4) Disconnect the connectors of fan motor, vane motor, drain pump, room temperature thermistor, pipe temperature thermistor, condenser/evaporator temperature thermistor and drain sensor on the electrical controller board.
- Page 24 OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS Photo 6 Drain sensor Drain pump 5. Removing the drain pump (1) Remove the panel. (2) Unhook the claw in the middle of stabilizer and remove the drain pan. (3) Remove the cover. (4) Remove the electrical parts cover. (5) Disconnect the connector of drain pump.
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Page 25: Parts List
PARTS LIST PANEL PARTS PMH-P25BA PMH-P35BA PMH-P50BA TEMP. ON/OFF Q'ty/set Price Wiring Recom- Remarks Diagram mended Part No. Part Name Specification (Drawing No.) PMH-P25/35/50BA Unit Amount Symbol Q'ty AIR OUTLET GRILLE T7W E11 003 LATCH R01 E00 055 HANGER (DT88D360H03) —... - Page 26 FUNCTIONAL PARTS PMH-P25BA PMH-P35BA PMH-P50BA SLEEVE BEARING VANE MOTOR VANE SLEEVE CONDENSER / EVAPORATOR TEMPERATURE THERMISTOR PIPE TEMPERATURE THERMISTOR / LIQUID ROOM TEMPERATURE THERMISTOR Part number that is circled is not shown in the figure. Q'ty/set Price Wiring Recom- Remarks PMH-P·BA Diagram mended...
- Page 27 ELECTRICAL PARTS PMH-P25BA PMH-P35BA PMH-P50BA Q'ty/set Price Wiring Recom- Remarks PMH-P25/35/50 Diagram mended Part No. Part Name Specification (Drawing No.) Unit Amount Symbol Q'ty CONTROL BOX (RG02B337G16) — TERMINAL BLOCK T7W E13 716 3P (S1, S2, S3) TERMINAL BLOCK T7W 515 716 2P (1, 2) FUSE T7W 520 239...
- Page 28 HEAD OFFICE : MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication, effective Jul. 2005. Distributed in Jul. 2005 No.OC333 PDF 9 Specifications subject to change without notice. Made in Japan.