Toshiba RAV-SM1403AT-E1 service manual Coil heating control, Heating fan control, Normal time

4-2. Heating fan control

1)An outdoor fan is controlled by TE sensor, TO sensor and operation frequency. (It is controlled with W1 for minimum and the maximum is controlled according to the following table.)

2)At the start time, the fan is fixed for 3 minutes only with the maximum fan tap corresponded to the zone in the following table but it is controlled with TE sensor temperature after then.

3)When a status TE ≥ 24°C continues for 5 minutes, the operation stops. In this case, no error display

appears and the status is same as the normal thermo-OFF. The can restarts after approx. 2 minutes 30 seconds and this continuous operation is not an error.

4)When the above status as 3) occurs frequently, it is considered that filter of the suction part of the indoor unit is dirty. Clean the filter and restart the operation.

TE

24˚C

21˚C

18˚C

15˚C

–2 tap / 20 seconds (up to W1) Stop timer count

–2 tap / 20 seconds (up to W1)

–1 tap / 20 seconds (up to W1)

Rotational frequency hold

+1 tap / 20 seconds

(up to Max. tap of each zone)

	SM110	Under 31.2 Hz	Over 31.2,	Over 47.4 Hz
			under 47.4 Hz
Temp. range	SM140	Under 36.0 Hz	Over 36.0,	Over 55.8 Hz
			under 55.8 Hz
		MAX.	MAX.	MAX.
10˚C ≤ TO		W7	W8	W9
5˚C ≤ TO < 10˚C		W9	WB	WF
– 3˚C ≤ TO < 5˚C		WF	WF	WF
– 10˚C ≤ TO < – 3˚C		WF	WF	WF
TO < – 10˚C		WF	WF	WF
TO error		WF	WF	WF

5.Coil heating control

1)This control function heats the compressor by turning on the stopped compressor instead of a case heater. It purposes to prevent stagnation of the refrigerant inside of the compressor.

2)As usual, turn on power of the compressor for the specified time before a test run after installation; otherwise a trouble of the compressor may be caused.

As same as a test run, it is recommended to turn on power of the compressor beforehand when starting operation after power of the compressor has been interrupted and left as it is for a long time.

3)A judgment for electricity is performed by TD and TO sensors.

If TO sensor is defective, a backup control is automatically performed by TE sensor. For a case of defective TO sensor, judge it with outdoor LED display.

4)For every model, the power is turned off when TD is 30°C or more.

TO 0˚C

– 1˚C

•Power-ON condition

TD<30˚C – 2˚C

– 3˚C

(Normal time)	TE
	2˚C
No power
Intermittent power-ON	1˚C
	• Power-ON
10 minutes: ON /	condition
5 minutes: OFF	TD < 30˚C 0˚C
Output
[24W or equivalent]	– 1˚C
Continuous power-ON
Output
[24W or equivalent]

(In defective TO sensor)

No power

Intermittent power-ON 10 minutes: ON /

5 minutes: OFF Output

[24W or equivalent]

Continuous power-ON Output

[24W or equivalent]

REQUIREMENT

While heating the coil, the power sound may be heard. However it is not a trouble.

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