Mitsubishi Electric PK12FK Technical & Service Manual page 38

(1) Initial setting
A. When power is turned to on, or when the compressor restarts after interval of 30 minutes or more :
If the outdoor coil thermistor reads 46˚F or above, the fan output step becomes 100.
If the outdoor coil thermistor reads below 46˚F, the fan output step becomes 200.
B. When the compressor restarts within 30 minutes after stop, the fan output step is the same as the fan output before the
compressor stops.
C. When the operation mode is changed within 30 minutes after the compressor stop, the fan output step becomes 100.
D. When the operation mode is changed after the compressor interval of more than 30 minutes, the fan output step is the
same as described in A.
(2) For the first 2 minutes after the compressor start-up, the fan operates at the initial setting output, and then every other 30
seconds, the fan output is adjusted depending on the difference between the outdoor coil temperature and the target tem-
perature. But as soon as the outdoor coil temperature becomes 122˚F or above, the fan output step becomes 255.
(3) When the outdoor coil thermistor reads 122˚F or above, the fan output step becomes 255.
(4) When the high pressure switch (63H1) functions, the fan output step becomes 255. After that, when the switch returns, the
fan control returns to the normal control.
8-5 Crankcase heater control
(1) With jumper wire J3
The crankcase heater is ON from the power is turned to on till the compressor starts, and turns to ON 1 hour after the com-
pressor stop.
(2) Without jumper wire J3
The crankcase heater is ON from the power is turned to on till the compressor starts, and repeats ON/OFF on a 1-hour
schedule.
8-6 Fixed fan-output
While the compressor is operating and the fan output step is indicated by LED, pushing SW2 fixes the fan output of that time.
The fixed fan-output can be released when either of the following conditions is satisfied.
1 SW2 is pushed again.
2 SW3 setting is changed.
3 The compressor stops.
4 Defrosting operation starts. (for heat pump unit)
8-7 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-switch)
For further information, please refer to page 76.
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