Toshiba RAS-B13SKVP-E Operation flow and applicable data, etc, Case of operation stop, Condition

Item		Operation flow and applicable data, etc.
7. Quick heating	This function quickens the starting of heating opera-
control	tion when indoor/outdoor temperature is low.
	(Available only in heating operation)
	When indoor temperature is low, this function stores
	the heat by heating winding depended on the outdoor
	temperature and then it enables the hot air blowing out
	quickly.
		In case of operation stop

		NO
The previous operation was heating and
2 hours passed after the operation had stopped.
	YES
Winding is not heated.

Description

When the following conditions are satis- fied, winding is heated by output varied by the outdoor heat exchanger temperature.

Condition 1 :

The previous operation was heating.

Condition 2 :

2 hours passed after operation stop.

Condition 3 :

The room temperature is 20°C or lower.

The indoor temperature sensor detects the room temperature.

If the detected room temperature is 20°C or lower, the outdoor heat exchanger temperature sensor detects the outdoor heat exchanger temperature. As shown in

20˚C	Outdoor heat exchanger temperature
Indoor temperature

0˚C

–1˚C

–6˚C

–7˚C

Heating output for winding

OFF

10W or equivalent

10W or equivalent

the left figure, winding of the compressor is heated for each division of the tempera- ture ( for each outdoor temperature) and the heat is stored.

8. Defrost control	(This function removes frost adhered to the outdoor
(Only in heating	heat exchanger.)
operation)	The temperature sensor of the outdoor heat ex-
	changer (Te sensor) judges the frosting status of the
	outdoor heat exchanger and the defrost operation is
	performed with 4-way valve reverse defrost system.

Start of heating operation

temperature	0’	10’ 15’	29’	35’	Operation time
					(Minute)
	–4˚C
exchanger
	–6˚C				C zone
				A zone
heat
	–25˚C
Outdoor				B zone
		*
	Te0 detection time

*The minimum value of Te sensor 10 to 15 minutes after start of operation is stored in memory as Te0.

Table 1

A zone	When Te0 - TE ≥ 2.5 continued for 2 minutes in A zone,
	defrost operation starts.
B zone	When the operation continued for 2 minutes in B zone,
	defrost operation starts.
C zone	When Te0 - TE ≥ 3 continued for 2 minutes in C zone,
	defrost operation starts.

The necessity of defrost operation is detected by the outdoor heat exchanger temperature. The conditions to detect the necessity of defrost operation differ in A, B, or C zone each. (Table 1)

<Defrost operation>

• Defrost operation in A to C zones

1)Stop operation of the compressor for 20 seconds.

2)Invert (ON) 4-way valve 10 seconds after stop of the compressor.

3)The outdoor fan stops at the same time when the compressor stops.

4)When temperature of the indoor heat exchanger becomes 38°C or lower, stop the indoor fan.

<Finish of defrost operation>

•Returning conditions from defrost operation to heating operation

1)Temperature of outdoor heat exchanger rises to +8°C or higher.

2)Temperature of outdoor heat exchanger is kept at +5°C or higher for 80 seconds.

3)Defrost operation continues for 15 minutes.

<Returning from defrost operation>

1)Stop operation of the compressor for approx. 50 seconds.

2)Invert (OFF) 4-way valve approx. 40 seconds after stop of the compressor.

3)The outdoor fan starts rotating at the same time when the compressor starts.

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