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4) The time of above d can be changed by
exchanging jumper [J805] and [J806] of the
outdoor control P.C. board.
(Setting at shipment: 150 minutes)
A zone
B zone
C zone
D zone
In normal To In abnormal To
When status (TE0 – TE) – (To0 – To) ≥ 37.4°F (3°C) When status (TE0 – TE) ≥ 37.4°F (3°C)
continued for 20 seconds continued for 20 seconds
When status (TE0 – TE) – (To0 – To) ≥ 35.6°F (2°C) When status (TE0 – TE) ≥ 35.6°F (2°C)
continued for 20 seconds continued for 20 seconds
When status (TE ≤ –9.4°F (–23°C)) continued for 20 seconds
When compressor operation status of TE < 28.4°F (–2°C) is calculated by d portion
¡
: Short circuit,
×
: Open
10. 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 higher for 3 seconds or
continued 44.6°F (7°C) ≤ TE < 53.6°F (12°C) for 1 minute.
The defrost operation also finishes when it continued for 10 minutes even if TE sensor temperature was
44.6°F (7°C) or lower.
3) After defrost operation was reset, the compressor stopped for approx. 40 seconds and then the heating
operation starts.
∗ 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.
0 10 15 39 45 55 d
[min.]
∗
TE ˚F (˚C)
28.4 (–2)
23.0 (–5)
14.0 (–10)
–9.4 (–23)
A zone
A zone
B zone
B zone
C zone
C zone
D zone
D zone
A zone
B zone
C zone
D zone
Start of heating operation
J805
¡
¡
×
×
d
150 minutes
Setting at shipment
90 minutes
60 minutes
30 minutes
J806
¡
×
¡
×