Mitsubishi Electric PUH-P8YE Technical & Service Manual page 43

4) Emergency operation method
Piping work complete?
Check that mains power is OFF
Turn on emergency operation switch
(SWE) on indoor controller board
Short CN31
connector) on outdoor controller board
Set operation mode (cooling or heating) with SW4-2 on outdoor board
(SW4-1 not used)
Cooling
Turn on indoor power *1
Check that emergency operation starts,
and that operation mode display flashes
5) Emergency operation release method
1
Turn off mains power. (Outdoor, indoor)
*1
2
Turn off emergency operation switch
(SWE) on indoor controller board
3
Open CN31 (emergency operation
connector) on outdoor controller board
4
Set SW4-2 as shown below
5
Turn on mains power
Start
YES
(emergency operation
SW4
OFF ON
1
2
Heating
Turn on mains power
SW4
OFF ON
1
2
* Before starting, recheck that the trouble allows
emergency operation.
NO
*1 Only when PEH-P8YE or P10YE indoor unit
connected.
*1. When PEH-P8YE or P10YE indoor unit is con-
nected, first turn off the outdoor unit power, then
turn off the indoor unit power.
–41–