Toshiba RAV-SM304SDT-TR Service Manual page 68

10. Defrost control
<SP56 only>
1) In heating operation, defrost operation is performed when TE sensor satisfies any condition in A zone to D
zone.
2) During defrosting operation, it finishes if TE sensor continued 12°C or continued 5°C ≤ TE < 12°C for
80 seconds. The defrost operation also finishes when it continued for 15 minutes even if TE sensor tem-
perature was 5°C or lower.
3) After defrost operation was reset, the compressor stopped for approx. 40 seconds and then the heating
operation starts.
Start of heating operation
TE [˚C]
0 10 15
–4
–6
–10
–25
∗
∗ The minimum TE value and To value between 10 and 15 minutes after heating operation has started are
stored in memory as TE0 and To0, respectively.
A zone
B zone
C zone
D zone
29 35
In normal To
When status (TE0 – TE) – (To0 – To) ≥ 3°C
continued for 20 seconds
When status (TE0 – TE) – (To0 – To) ≥ 2.5°C
continued for 20 seconds
When the status (TE ≤ –26°C) continued for 20 seconds
When the status (TE ≤ –10°C) continued for 20 seconds
A zone A zone
B zone B zone
C zone C zone
When status (TE0 – TE) ≥ 3°C
When status (TE0 – TE) ≥ 2.5°C
– 68 –
91
In abnormal To
continued for 20 seconds
continued for 20 seconds
[min.]
D zone D zone