Indoor Unit Control - Mitsubishi Electric PCH-2GKHA Service Manual

2. INDOOR UNIT CONTROL

2-1COOL operation
4
<COOL operation time chart>
Operation starts by
P O W E R b u t t o n
ON.
ON
Thermostat
OFF
ON
Indoor fan
OFF
30!
discharge
Auto vane
position
ON
Drain pump
(OPTIONAL)
OFF
ON
Booster heater OFF
ON
Compressor OFF
w1 Even if the room temperature rise above the set temperature during this period, the compressor will not start until this period has ended.
(1) Compressor control
1 3-minute time delay
To prevent overload, the compressor will not start within 3 minutes after stop.
2 The compressor runs when room temperature is higher than set temperature.
The compressor stops when room temperature is equal to or lower than the set temperature.
3 The compressor stops in check mode or during protective functions.
4 Coil frost prevention
To prevent indoor coil frost, the compressor will stop when the indoor coil thermistor (RT2) reads 1°C or below after the
compressor has been continuously operated for at least 16 minutes or more. When the indoor coil temperature rises to
10°C or above, the compressor will start after a 3-minute time delay.
NOTE : By cut off the J-5 (Jumper resistance)on indoor controller board, the start temperature of coil frost prevention
changes from 1°C to -3°C.
<How to operate>
1 Press POWER ON/OFF button.
2 Press the a button to display " f ".
3 Press the i TEMP button to set the desired temperature.
NOTE: Set temperature changes 1°C when the
FILTER
CHECK MODE
TEST RUN
Room temperature
becomes equal to
set temperature.
LOW or HIGH
Initially horizontal
(Changeable by remote controller setting)
OFF
Minimum 3 minutes w1
button is pressed one time.
Cooling 19°C to 30°C
Room temperature Operation stops by
rises above set P O W E R b u t t o n
temperature. OFF.
LOW or HIGH
30!
or
discharge
position
3 minutes
27