Mitsubishi Electric PCH-2GKHA Service Manual page 35

(3) Auto vane control
(a) STOP mode (fixed operation)
( i ) The airflow direction at the start-up of HEAT operation is the same as that of the previous operation.
( ii ) The airflow direction can be charged by the remote controller setting.
horizontal
In the following cases, airflow direction becomes horizontal regardless of the remote controller setting.
1 During the hot adjustment with fan speed at EXTRA-LOW
2 During defrosting with indoor fan OFF
3 During the thermostat OFF
(b) SWING mode
( i ) The vane motor turns ON when the SWING mode is selected.
The vane motor is continuously ON during SWING mode.
( ii ) In the following cases, the airflow direction is horizontal regardless of the remote controller setting.
1 During the hot adjustment with fan speed at EXTRA-LOW
2 During defrosting with indoor fan OFF
3 During thermostat OFF
(4) Booster heater control
When the room temperature is 3 degrees below from the set temperature, the booster heater will turn ON.
When the room temperature is equal to the set temperature, booster heater will turn OFF.
During the hot adjustment, the booster heater will not work.
< Overheat prevention >
When the indoor coil thermistor rises to 60: or above, the booster heater cannot work.
When the indoor coil thermistor falls to 55: or below, the booster heater can work.
(5) Detecting abnormalities in the outdoor unit
When the outdoor unit is determined to be abnormal by the following causes, the compressor will stop and the check code
" P8 " will appear on the remote controller display.
1 During compressor ON after hot adjustment
1 If the difference between the indoor coil temperature and room temperature is in the RANGE B, the indoor fan will
stop.
2 Within 20 minutes after entering RANGE B (except for the first 10 seconds),
a) If the temperature difference enters RANGE A, the hot adjustment stasrts,
b) If the temperature difference is still in RANGE B, the outdoor unit is deemed abnormal.
c) If the temperature difference enters RANGE C, defrosting starts.
Within 20 minutes after entering RANGE C,
If the temperature difference does not return to RANGE B,the outdoor unit is deemed abnormal.
If the temperature difference returns to RANGE B, the next 20 minutes is an allowance period. If the difference enter
RANGE A during the allowance, defrosting ends and the hot adjustment starts. If the difference does not enter
RANGE A during the allowance, the outdoor unit is deemed abnormal.
2 During compressor ON in hot adjustment
After 30 minutes of defrosting in hot adjustment, if the temperature difference is still in RANGE C, the outdoor unit is
determined to be abnormal.
3 During compressor OFF
After 20 minutes of thermostat OFF, if the indoor coil thermistor reads -25°C or below, the outdoor unit is determined to
be abnormal.
20° 40°
60° SWING
w1 (See the next page)
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