Mitsubishi Electric Mr.SLIM PEH Series Technical & Service Manual page 40

3-7 Service functions
(1) Compulsory defrosting
1When all of the following conditions are satisfied, pressing SW2 starts the compulsory defrosting.
During HEAT mode
The compressor is ON.
The outdoor coil temperature is being displayed by LED. (Outdoor controller board dip switch SW3-1 : OFF, SW3-2 :
ON)
The outdoor coil thermistor reads 8°C or below.
2The operation state and the termination conditions of the compulsory defrosting are the same as those of the normal
defrosting. As an exception, the defrost interval after the defrosting completion is 50 minutes.
(2) Fixed fan-output
While the compressor is operating (exept during defrosting) and the fan output step is indicated by LED, pressing SW2
fixes the fan output. The fixed fan-output can be released when any of the following conditions are satisfied.
1SW2 is pressed again.
2SW3 setting is changed.
3The compressor stops.
4Defrosting operation starts.
(3) Function of switches on the outdoor controller board
SW1: Clears the check code memory (push-button switch)
SW2: Switches the output state indication and the check code display (push-button switch)
SW3-1,2: Switches the output state indication items (dip swtich)
For further information, refer to page 47.
(4) 100% fan output
Fan output is fixed to 100% by shorting the connector CN22. However, the fan stops during compressor OFF or defrosting.
Open-circuit of CN22 restarts the normal fan control.
(5) Time shorterning
Short circuit of the connector CN21 shortens the time as follows
1Fan control period
2Three-minutes time delay function
3Max. time of defrosting
4Defrost interval
5Compressor ON/OFF time for bypass valve ON/OFF : 30 minutes
6Compressor ON time to start other functions
7Crankcase heater operation
40
: 30 seconds 3 seconds
: 3 minites 3 seconds
: 15 minites 15 seconds
: 30 ~ 120 minutes 3 ~ 12 seconds
3 seconds
: x minutes x seconds
: 1 hour 6 seconds