Toshiba RAV-SM563UT-E Service Manual page 79

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
TE [ºC]
–4 (–5)
–6 (–10)
–10 (–13)
–25 (–18)
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.
Defrost operation is performed in this zone when TE0-TE > 3 continued for T seconds.
A zone
Defrost operation is performed in this zone when TE0-TE > 3 continued for T seconds.
B zone
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.
a
b
c
d
T
10 15
*
SM56, SM80
35
29
29
90
20
c b a
B z B zone B zone one
C z C zone C zone one
SM110, SM140
50
35
30
90
20
– 79 –
d [min.]
A zone A zone A z one
D zone D zone D z one