Panasonic R410A service manual 2-2Cold Draft Prevention Heating Cycle, Processes and functions

2. Processes and functions

2-2 Cold Draft Prevention (Heating Cycle)

The cold draft prevention function controls indoor fan speed so a strong draft of cold air will not blow out before the indoor heat exchange coils have warmed up.

STANDBY shows on the remote controller when the indoor fan speed is LL (very low) or OFF. This condition occurs in the following 3 cases:

•During Thermo OFF (refer to 2-1 B. Room Temperature Control, Heating)

•During the defrosting operation (refer to 2-10 Defrosting Control, Heating)

•Until either the coil temperature E2 reaches 81°F or when a maximum of 6 minutes

has past.

The indoor fan motor operates in L instead of LL for 3 seconds as it starts to give the fan an initial boost.

	92
		MAX. 6 MINUTES
INDOOR UNIT	88
COIL TEMP.
E2 (°F)	81

2		77
		50
	SET		AUTO OR H	LL		LL/OFF	LL	L	M	H
	FAN		M	LL		LL/OFF	LL	L	M	M
	SPEED
			L	LL		LL/OFF	LL	L	L	L
		“STANDBY”
						“STANDBY” APPEARS
		INDICATOR
					LL= Very low speed				M= Medium speed
					L= Low speed				H= High speed	1135_THS_I

Fig. 3

Chart Summary and Explanations

The main idea of this chart is to show that the indoor fan speed increases and gets closer to the set fan speed as the coil temperature E2 rises.

The indoor unit fs coil temperature is taken from sensor E2 located in the middle of the indoor heat exchange coil.

The dotted line shows that the indoor fan motor is OFF. When the temperature at sensor E2 falls below 50 ˚F, the indoor fan motor stops running.

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