Mitsubishi Electric FDC100VNA, Техническое руководство

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- 114 -
'11 • PAC-T-160
(5) Defrosting
(a) Defrosting start conditions
If all of the following defrosting conditions A or conditions
B are met, the defrosting operation starts.
1) Defrosting conditions A
a) Cumulative compressor operation time after the
end of defrosting has elapsed 37 [45] minutes,
and the cumulative compressor operation time
after the start of heating operation (remote
controller ON) has elapsed 30 minutes.
b) After 5 minutes from the compressor ON
c) After 5 minutes from the start of outdoor unit fan
d) After satisfying all above conditions, if temperatures
of the outdoor unit heat exchanger temperature
thermistor (Tho-R1, R2) and the outdoor air
temperature thermistor (Tho-A) become lower
than the defrosting start temperature as shown
by the right figure for 15 seconds continuously,
or the suction gas saturation temperature (SST)
and the outdoor air temperature (Tho-A), which
are obtained from the value detected by the
low pressure sensor (LPT) stay for 3 minutes
within the range below the defrosting operation
start temperature as shown by the right figure.
However, it excludes for 10 minutes after the start
of compressor and the outdoor air temperature is
as shown by the lower figure.
LPT detection
Outdoor air temp. (°C)
2 4
LPT invalid
Note (1) Figures in [ ] is for model 71.
2) Defrosting conditions B
a) When previous defrosting end condition is the
time out of defrosting operation and it is in the
heating operation after the cumulative compressor
operation time after the end of defrosting has
become 30 minutes.
b) After 5 minutes from the start of compressor
c) After 5 minutes from the start of outdoor unit fan
(b) Defrosting end conditions
When any of the following conditions is satisfied, the
defrosting end operation starts.
1) When it has elapsed 8 minutes and 20 seconds after the start of defrosting. (After 10 minutes and 20 seconds for model 71)
2) When the outdoor unit heat exchanger temperatures (Tho-R1, R2), whichever the lower, becomes 12°C or higher for
10 seconds continuously.
Outdoor air temp.
(
͠
)
㨇
Tho-A
㨉
Outdoor air temp.
(
͠
)
㨇
Tho-A
㨉
Suction saturation temp.
(
͠
)
㨇
SST
㨉
Suction saturation temp.
(
͠
)
㨇
SST
㨉
-20
-25
-28.6
-30
-24
-15
-10
-8
-15 -10 -5 0 5 6 10 -20 -25
Defrost operation start temperature (Standard)
Defrost operation start temperature (SW3-1 ON)
-20
-25
-30
-31
-24
-15
-10
-8
-35
-15 -18 -10 -5 0 5 6 10 -25 -20
-18
Defrost operation start temperature (SW3-1 ON)
Defrost operation start temperature (Standard)
Defrost operation start
temperature zone
Defrost operation start
temperature zone
Model 71
Models 100 ~ 140
Outdoor air temp. (
͠
)
㨇
Tho-A
㨉
-20
-25
-27
-30
-15
-10
-5
-6
-2
-15 -10 -5 0 5 6 10 -20 -25
Defrost operation start
temperature zone
Defrost operation start temperature (Standard)
Defrost operation start temperature (SW3-1 ON)
Outdoor unit heat exchanger temp.
(
͠
)
㨇
Tho-R
㨉
-18
Models 71 ~ 140