Mitsubishi Electronics PKH24FL, PKH36FL, PKH30FL, PKH18FL service manual Cooling Operation

COOLING OPERATION

COOL operation
Four-way valve/OFF
NO	Initial
w 8	COOLING
	YES
	Vane initial
	setting

NO		Vane
		55 deg downward angle
		70 deg downward angle
	NO	YES
		Fan speed
		LOW
	NO	YES
		Downward discharge
		1 hour
		YES

Vane setting notch	Vane horizontal
	airflow

w9

Compressor YES thermostat ON

NO

Allowance cancel

NO	YES	3-minute
		time delay
		NO
	YES	6-minute				Allowance	YES
		time delay				period
		NO				NO
						6 minute
	NO	3-minute
						time delay
		compressor operation
		YES				Allowance set		Coil frost protection
		w 10	YES
		Coil frost
		protection
		NO
	w 11		NO
		Cooling area
		YES
	NO	10-minute		Indoor coil	NO	NO
		compressor operation					1 min continue
		YES		temperature is 50˚F
				or higher			YES
		Allowance cancel		YES
							FAN speed
		Coil frost	YES	Defrosting	NO		LOW
				protection detection
		prevention		temperature 30˚F			FAN speed	YES
		NO		or lower
				YES			LOW 5 min elapse
		16-minute
	NO						NO
		compressor operation
								Outdoor unit
				6-minute	3-minute
		YES						trouble
				time delay	time delay
		Indoor pipe	YES
		temperature is 34˚F
		or lower
		NO	Coil frost	Coil frost
			prevention	prevention release

Compressor ON

Compressor OFF

1

w8 When operation stops or changes to cooling or dry mode, the auto vane turns to a horizontal angle. If operation changes during auto vane SWING, the auto vane will continue to swing.

w9 When operating TEST RUN, the thermostat will be continuously ON.

w10 After 3 minute compressor operation, if the indoor coil thermistor reads 5°F or below for 3 minutes, the compressor will stop for 6 minutes.

w11Heating area : Indoor coil temperature is more than 9 degrees above the room temperature. Cooling area : Indoor coil temperature is more than 9 degrees below the room temperature. FAN area : Indoor coil temperature is within 9 degrees either way of the room temperature.

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