Toshiba RAS-13YAV-E, RAS-13YKV-E, RAS-10YKV-E, RAS-10YAV-E Defrost control, 5Louver control

(˚C)	TO
temp.	16,0	10,8A
air	15,5
Outside	11,0	10,3A
	10,5
		9,8A

Fig. 8-2-8

(4)Defrost control

1)Detection of frost

In heating operation, time duration while the compressor operates is counted, and defrost operation starts by any condition described below.

a.The counted time is 28 minutes or more, and status that temperature of the outdoor heat exchanger detected by the outdoor heat exchanger is –20°C or lower contin- ued for 2 minutes or more.

b.The counted time is 28 minutes or more, and status that temperature of the outdoor heat exchanger detected by the outdoor heat exchanger is –7°C or lower and temperature lowered by 2,5 °C than the minimum value of the outdoor heat ex- changer during 10 to 15-minutes count time continued for 2 minutes or more.

c.The counted time is 34 minutes or more, and status that temperature of the outdoor heat exchanger detected by the outdoor heat exchanger is –5°C or lower and temperature lowered by 3,0 °C than the minimum value of the outdoor heat ex- changer during 10 to 15-minutes count time continued for 2 minutes or more.

d.If the following three conditions are satis- fied, defrost operation (Timer defrost) starts after heating operation for 37 minutes.

Q Setting on remote control, HEAT (mode), HIGH (Fan), 30°C (temp.).

R Room temp. is 19°C to 24°C, and outside air temp. is 5°C or lower.

SDefrost operation has been already performed once.

2)Defrost operation

Operation of the compressor is stopped once, turn off power coupler for four-way valve after 10 seconds, and then exchange the four-way valve.

After 20 seconds, restart operation of the compressor. Turn off the outdoor fan just when the compressor stopped.

If temperature of the indoor heat exchanger lowered than 38°C, stop the indoor fan.

3)Defrost reset

Resetting operation from defrost to heating is performed when any one of the following conditions is satisfied.

a.Temperature of the outdoor heat ex- changer rose to +8°C or higher.

b.A status that temperature of the outdoor heat exchanger is +5°C or higher contin- ued for 80 seconds.

c.Defrost operation continued for 10 min- utes.

In resetting defrost operation, the compressor stops for 50 seconds if defrost has started under condition a. to c. in item 1), but the compressor is reset to heating operation keeping operated if defrost has started under condition d. in item 1).

(5)Louver control

The vertical air flow louvers are automatically set to heating position or heat memory position. When the compressor is turned off by high-temp. release control, the vertical air flow louvers close once and then return to the position of previous time.

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