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6. Defrost control
Q In heating operation, defrost operation is performed when TE sensor temperature satisfies any condition
in A zone to D zone.
R The defrost operation is immediately finished if TE sensor temperature has become 12°C or more, or it
also is finished when condition of 7°C < TE < 12°C has continued for 1 minute. The defrost operation is
also finished when defrost operation has continued for 10 minutes even if TE sensor temperature has
become 7°C or lower.
S After defrost operation has finished, the compressor and the outdoor fan start heating operation after
stopped for approx. 50 seconds.
Start of heating operation
0
10
15
c
b
a
d
[min.]
TE [ºC]
–4 (–5)
A zone
zone
–6 (–10)
–10 (–13)
B zone
zone
–25 (–18)
D zone
zone
C zone
zone
*
Numerals enclosed with parentheses represent numeral values of SM110 and SM140.
* 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 > 3 continued for T seconds.
B zone
Defrost operation is performed in this zone when TE0-TE > 3 continued for T seconds.
C zone
Defrost operation is performed when this zone continued for T seconds.
D zone
Defrost operation is performed when this zone continued for T seconds.
SM56, SM80
SM110, SM140
a
35
50
b
29
35
c
29
30
d
90
90
T
20
20
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