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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 12°C or higher for 3 seconds or continued
7°C ≤ TE < 12°C for 1 minute.
The defrost operation also finishes when it continued for 10 minutes even if TE sensor temperature was
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.
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)
0 10 15 39 45 55 d
[min.]
∗
TE [˚C]
–2
–5
–10
–23
A z
A z
one
one
B z
B z
one
one
C z
C z
one
one
D z
D z
one
one
A zone
B zone
C zone
D zone
Start of heating operation
A zone
B zone
C zone
D zone
In normal To In abnormal To
When status (TE0 – TE) – (To0 – To) ≥ 3°C When status (TE0 – TE) ≥ 3°C
continued for 20 seconds continued for 20 seconds
When status (TE0 – TE) – (To0 – To) ≥ 2°C When status (TE0 – TE) ≥ 2°C
continued for 20 seconds continued for 20 seconds
When status (TE ≤ –23°C) continued for 20 seconds
When compressor operation status of TE < –2°C is calculated by d portion
J805 J806
¡¡
¡
×
×
¡
××
d
150 minutes
Setting at shipment
90 minutes
60 minutes
30 minutes
¡
: Short circuit,
×
: Open