Defrost Control; Start Of Heating Operation - Toshiba Carrier RAV-SP180AT2-UL Service Manual

11. Defrost control

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 53.6°F (12°C) or continued 41°F (5°C) ≤
TE < 53.6°F (12°C) for 80 seconds. The defrost operation also finishes when it continued for 15 minutes
even if TE sensor temperature was 41°F (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

0 10 15
TE
˚F (˚C)
24.8 (–4)
21.2 (–6)
14 (–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.
When status (TE0 – TE) – (To0 – To) ≥ 37.4°F (3°C)
A zone
When status (TE0 – TE) – (To0 – To) ≥ 36.5°F (2.5°C)
B zone
C zone
D zone
29 35
In normal To
continued for 20 seconds
continued for 20 seconds
When the status (TE ≤ –14.8°F (–26°C)) continued for 20 seconds
When the status (TE ≤ 14°F (–10°C)) continued for 20 seconds
A zone A zone A zone
B zone B zone B zone
C zone C zone C zone
When status (TE0 – TE) ≥ 37.4°F (3°C)
continued for 20 seconds
When status (TE0 – TE) 36.5°F (2.5°C)
continued for 20 seconds
– 37 –
91
D zone D zone D zone
In abnormal To
[min.]