Fujitsu ARTG36LHTB - Page 130

01-16
3. Defrost Flow Chart
Outdoor heat exchanger temp. < -17°C
(at outside air temp. > -10°C)
Outdoor heat exchanger temp. < Outside air temp.- 7°C
or Outdoor heat exchanger temp. < -20°C
(at outside air temp. < -10°C)
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Com
p
re
sso
r
OFF
O
u
tdo
o
r f
a
n mo
tor
OFF
30
se
c
la
t
e
r 4-
wa
y
val
v
e
OF
F
35
se
c
la
t
e
r c
o
mp
r
esso
r O
N (7
5r
p
s)
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
(Not defrosted for 10 minutes)
Heating operation start : Compressor ON
Outdoor heat exchanger temperature:
Over +13°C
or
Compressor ON time: Maximum 15 minutes
Defrost end
Compressor
integrating
operation:
Over 22 min.
Outdoor
heat exchanger
temperature:
Below - 9°C
Outdoor
heat exchanger
temperature:
Below - 5°C
Compressor
integrating
operation:
Over 35 min.
2nd and later defrost
Integrating defrost
(Constant monitoring)
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Defrost start
Tn-Tn10 < - 5deg
Tn-Tnb < - 2deg
However, Tn <- 6°C
Compressor
OFF count :
40 times
(Less than 10min.)
1st defrost
Compressor
integrating
operation:
Over 62 min.
Compressor
integrating
operation:
Over 240 min.
Outdoor
heat exchanger
temperature:
Below - 3°C
Compressor
integrating
operation:
Over 215 min.
Outdoor
heat exchanger
temperature:
Below - 5°C
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