On Off - Mitsubishi Electric PK-2.5FLD Technical & Service Manual

2-6 Emergency operation
When the remote controller or microprocessor malfunctions and no other trouble exists, emergency operation is available
by setting the dip switch on the controller board.
[Check items]
(1) Make sure the compressor and the fans are running normally.
(2) Locate the trouble with the self-diagnostic function.If the self-
diagnostic function indicates that the protection device (such
as coil frost protection) is functioning, the sources must be
removed before attempting emergency operation.
Emergency operation ON/OFF is activated not with the
remote controller but with the circuit breaker.
[Emergency operation procedure]
(1) Cooling operation is available by setting the dip switch SW3
1and 2 ON and 3 OFF on the indoor controller board.
(2) To start emergency operation, turn the outdoor side circuit
breaker ON first, and then the indoor side circuit breaker ON.
(3) During emergency operation, the indoor fan runs on HIGH
speed, the compressor runs continuously, and the louver
stops.
(4) Thermostat will not function.
(5) Do not use emergency cooling operation for more than 10
hours, as the indoor coil may freeze.
2-7 Function of jumper wire and dip switch on indoor controller board
1. Jumper wire
1 JR01:Jumper wire for the auto vanes
Cut JR01 for the unit WITHOUT auto vanes.
2 JR02:Jumper wire for the temperature to start coil frost prevention
Cutting JR02 changes the temperature from +1°C to -3°C.
3 JR03:Jumper wire for set temperature adjustment in HEAT mode
In HEAT operation, heated air stagnates in the upper part of the room. The indoor unit installed in the upper part of
the room will detect the air temperature higher than the actual temperature in the living space. This difference is
about 4 degrees. Therefore, the temperature detected by the room temperature thermistor should be corrected 4
degrees down. The unit with JR04 attached will make this adjustment.
4 JR04:Jumper wire for the indoor fan speed during thermostat OFF in HEAT mode
Cutting JR04 Changes the speed from Extra-Low to Low.
5 JR05:Jumper wire for detecting abnormalities in the outdoor unit
Cutting JR05 makes this detection unavailable. (Occurrence of abnormality can not be detected.)
6 JR06:Jumper wire for auto restart function
Cutting JR06 makes the auto restart function available.
2. Dip switch
1 SW1 (Function switch)
ON
OFF
SW1-1) Switch for power supply
ON :220V
OFF:230V, 240V
SW1-2) Switch for single or twin control
ON :Twin control
OFF:Single control
SW1-3) Switch for unit number in twin control (This switch is valid when SW1-2 is ON.)
ON :Unit No.2
OFF:Unit No.1
1 2 3 4 5 6 7 8
SW3 INDOOR CONTROLLER BOARD
SW3
ON
OFF
1 2 3
COOLING
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