Mitsubishi Electric PUHZ-P125 Service Manual Page 55
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55
11-8. EMERGENCY OPERATION
(1) When the error codes shown below are displayed on outdoor unit or microcomputer for wired remote controller or indoor
unit has a failure, but no other problems are found, emergency operation will be available by setting the emergency opera-
tion switch (SWE) to ON and short-circuiting the connector (CN31) on outdoor controller board.
(2) Check the following items and cautions for emergency operation
1 Make sure that there is no abnormality in outdoor unit other than the above abnormalities. (Emergency operation will
not be available when error code other than the above are indicated.)
2 For emergency operation, it is necessary to set the emergency operation switch (SWE) on indoor controller board. Refer
to the electrical wiring diagram of indoor unit for how to set the indoor unit.)
3 During emergency operation, the air-conditioner will continuously be operated by supplying power and stopping it: It can
not be turned on or off by remote control, and temperature control is not possible.
4 Do not perform emergency heating operation for an extended period of time: If the outdoor unit starts defrosting during
this period, cold air will blow out from the indoor unit.
5 Do not perform emergency cooling operation for more than 10 hours: Neglecting this could result in freezing the heat
exchanger in indoor unit.
(3) Emergency operation procedure
1 Turn the main power supply off.
2 Turn on the emergency operation switch (SWE) on indoor controller board.
3 Set the shorting pins of emergency operation connector (CN31) on outdoor controller board to ON.
4 Use SW4-2 on outdoor controller board to set the operation mode (cooling or heating). (SW4-1 is not used.)
5 Turning the main power supply on will start the emergency operation.
SW4
1 2 Cooling
Heating
ON
ON
OFF
CN31
Shorting pins
(4) Releasing emergency operation
1 Turn the main power supply off.
2 Set the emergency operation switch (SWE) on indoor controller board to OFF.
3 Set the shorting pins of emergency operation connector (CN31) on outdoor controller
board to OFF.
4 Set SW4-2 on outdoor controller board as shown in the right.
w If shorting pins are not set on emergency operation connector (CN31), the setting remains OFF.
SW4
1 2 Coolin
g
Heatin
g
ON
Inspected content
Open/short of pipe thermistor (TH3/TH6)
Indoor/outdoor unit communication error • Signal receiving error (Outdoor unit)
Indoor/outdoor unit communication error • Transmitting error (Indoor unit)
Communication error other than outdoor unit
Communicaiton error between outdoor controller board and M-NET board (Serial communication error)
Error code
U4
E8
E9
E0 ~ E7
Ed
LWhen following abnormalities occur, emergency operation will be available.
- SERVICE MANUAL 1
- REFERENCE MANUAL 2
- TECHNICAL CHANGES 2
- SAFETY PRECAUTION 3
- Gravimeter 4
- [3] Service tools 4
- Dimension A 5
- Dimension B 5
- 4 FEATURES 6
- 5 SPECIFICATIONS 7
- MICROPHONE 9
- 6-4. STANDARD OPERATION DATA 10
- 7 OUTLINES AND DIMENSIONS 11
- Example of Notes 12
- Piping Knockout Hole Details 12
- PUHZ-P125VHA2 15
- .UK PUHZ-P140VHA21.UK 15
- • Synchronized triple 16
- • Synchronized twin 16
- 9-4. M-NET WIRING METHOD 19
- 10 REFRIGERANT SYSTEM DIAGRAM 21
- 11 TROUBLESHOOTING 23
- OUTDOOR BOARD LED Display 24
- 1, L2, L3 and 24
- TEST RUN 25
- Error code (2 or 4 digits) 26
- (Alternating Display) 26
- Power on indicator 27
- [Procedure] 28
- Beep Beep 29
- Continued to the next page 38
- From the previous page 39
- • Before repair 46
- 1.UK PUHZ-P140VHA21.UK 50
- DC DC250~330V 51
- CC DC15V 51
- Linear expansion valve 53
- <Composition> 54
- 11-8. EMERGENCY OPERATION 55
- 11-9. TEST POINT DIAGRAM 57
- Power consumption 61
- (Demand switch ON) 61
- Detailed 63
- 1 second 65
- SW2 setting 66
- Display detail 66
- Explanation for display Unit 66
- Explanation for display 67
- 1-phase open error 72
- 12 FUNCTION SETTING 73
- PEAD-EA(2) 74
- PKA-FAL(2) 74
- Setting number 75
- Mode number 75
- [Operating Procedure] 76
- Item 2Item 1 79
- Normal display 79
- 13 EASY MAINTENANCE FUNCTION 80
- 12,340 hours 81
- Waiting for response 81
- Blinking 81
- After approx 81
- 10 seconds 81
- Check Points 82
- 14-2. REQUEST CODE LIST 84
- Refer to 87
- 15 DISASSEMBLY PROCEDURE 93
- OPERATING PROCEDURE PHOTOS 94
- PHOTOS & ILLUSTRATION 98
- OPERATING PROCEDURE 100
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