Mitsubishi Electronics PCH24GK OC277-28, Indoor Unit Control, How to operate, Compressor control

2. INDOOR UNIT CONTROL

2-1 COOL operation

		SWING
TIMER OFF TIMER	CLOCK AUTO AUTO	FAN
CHECK SET TEMP.	START STOP		FILTER
		SPEED
		AUTO	CHECK MODE
		RETURN

TEST RUN

<COOL operation time chart>

<How to operate>

1Press POWER ON/OFF button.

2Press the MODE button to display COOL.

3Press the SET TEMP. button to set the desired temperature. NOTE: Set temperature changes 2°F when the SET TEMP. button

is pressed one time. Cooling 65 to 87°F.

		Operation starts by			Room temperature	Room temperature		Operation stops by
		P O W E R b u t t o n			becomes equal to	rises	above set	P O W E R b u t t o n
		ON.			set temperature.	temperature.		OFF.
Thermostat	ON
	OFF
			LOW or HIGH				LOW or HIGH
	ON
Indoor fan	OFF
Auto vane	ON
	OFF
	ON			OFF
Booster heater	OFF
Compressor	ON
	OFF						w1
					Minimum 3 minutes

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.

The compressor maintains the previous state when the room temperature minus the set temperature is 0 degrees or more, or lower than 2 degrees.

3 The compressor stops in check mode or during protective functions.

4Coil frost prevention

To prevent indoor coil frost, the compressor will stop when the indoor coil thermistor (RT2) reads 34°F or below after the compressor has been continuously operated for at least 16 minutes or more. When the indoor coil temperature rises to 50°F or above, the compressor will start in a 3-minute(w2) time delay.

w2 When the indoor coil temperature is 30°F or less, the compressor starts in 6 minutes.

NOTE : By turning OFF the dip switch SW1-3 on indoor controller board, the start temperature of coil frost prevention changes from 34°F to 36°F.

OC277-28