Defrost Control - Toshiba RAV-SM404SDT-E Service Manual

6. Defrost control

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In heating operation, defrost operation is performed when TE sensor temperature satisfies any condition
in A zone to C zone.
‚
The defrost operation is immediately finished if TE sensor temperature has become 12°C or more, or it
also is finished when condition of 5°C < TE < 12°C has continued for 80 seconds.
The defrost operation is also finished when defrost operation has continued for 15 minutes even if TE
sensor temperature has become 5°C or lower.
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After defrost operation has finished, the compressor and the outdoor fan start heating operation after
stopped for approx. 40 seconds.
Start of heating operation
0
TE [˚C]
–4
–6
–10
–25
* The minimum TE value between 10 and 15 minutes after heating operation has started is stored in memory as TE0.
A zone Defrost operation is performed in this zone when TE0-TE > 2.5 continued for 20 seconds.
B zone Defrost operation is performed in this zone when TE0-TE > 3 continued for 20 seconds.
C zone Defrost operation is performed when this zone continued for 20 seconds.
10 15
*
29 35
A zone A zone A z
B zone B zone B z one
C zone C zone C z one
– 86 –
[min.]
one
D zone D z one