Toshiba RAV-SM304SDT-TR Service Manual page 65

3-2) Heating fan control
The outdoor fan is controlled by TE sensor, TO sensor and the operation frequency.
(Control from minimum W1 to maximum (according to the following table))
For 3 minutes after the operation has started, the maximum fan tap corresponding to the zone in
the following table is fixed and then the fan is controlled by temperature of TE sensor.
TE [˚C]
–2 taps / 20 sec. (Down to W1)
Stop timer count
24
–2 taps / 20 sec. (Down to W1)
21
–1 tap / 20 sec. (Down to W1)
18
Revolution frequency hold
15
+1 tap / 20 sec
(Up to the maximum tap of each zone)
<SP56>
20 Hz
or lower
Temp. range
10°C ≤ TO
5.5°C ≤ TO < 10°C
–5°C ≤ TO < 5.5°C
TO < –5°C
TO error
4. 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) SP80 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.
Using TD sensor and TE sensor, SP56 judges the power-on.
4) For every model, the power is turned off when TD is 30°C or more.
20Hz 45Hz
to 45Hz or higher
Max. Max. Max.
W7 W8 W9
WA WC WE
WD WE WF
WE WF WF
WE WF WF
When TE ≥ 24°C continues for 5 minutes, the
compressor stops.
It is the same status as the normal THERMO
OFF without error display.
The compressor restarts after approx. 2 minutes
30 seconds and this intermittent operation is not
abnormal.
In case that the status in item
frequently, stain on filter of the suction part of
the indoor unit is considered.
Clean the filter and then restart the operation.
Temp. range
10°C ≤ TO
5°C ≤ TO < 10°C
–3°C ≤ TO < 5°C
–10°C ≤ TO < –3°C
TO < –10°C
TO error
– 65 –
generates
<SP80>
20 Hz 20Hz 45Hz
or lower to 45Hz or higher
Max. Max. Max.
W7 W8
W9 WB
WD WD
WE WE
WF WF
WF WF
W9
WD
WE
WE
WF
WF