-
43
-
-20
-25
-23
-21
-17
-15
-10
-5
-2
-15
-10
-5
0
5 6
10
-20
-23
Outdoor heat exchanger temperature (˚C) [Tho-R]
Outdoor air temperature (˚C) [Tho-A]
Defrosting operation start temperature (SW3-1 ON)
Defrosting operation start
temperature zone
Defrosting operation start temperature (Standard)
-20
-25
-30
-31
-24
-15
-10
-8
Inteke gas saturation temperature (˚C) [SST]
outdoor air temperature (˚C) [Tho-A]
-35
-15
-18
-10
-5
0
5 6
10
-25
-20
Defrosting operation start temperature (Standaed)
Defrosting operation start temperature (SW3-1 ON)
Defrosting operation start
temperature zone
(f)
Defrosting
( i ) Defrosting start conditions
If all the following defrosting conditions A and B
are satisfied, defrosting operation starts.
1) Defrosting conditions A
a) If 30 minutes of cumulative compressor op-
eration passes and after defrosting ends
and if there is 37 minutes of cumulative
compressor operating time after heating
begins (with the remote control ON).
b) 5 minutes passes after the compressor goes
ON.
c) 5 minutes passes after the outdoor unit fan
runs.
d) After all the above conditions are satisfied,
if the temperature sensed by the outdoor
heat exchanger thermistor (Tho-R1) and
outdoor air temperature thermistor (Tho-A)
remains at the defrosting start temperature
or lower as shown in the figure at right for
15 seconds continuously, or the intake gas
saturation temperature (SST), obtained
from the low pressure sensor’s (LPT) de-
tected value and outdoor air temperature
(Tho-A) are within a range that is below
the defrosting start temperature range
shown in the figure at right for 3 minutes.
However, when 10 minutes have passed
since the compressor started and the out-
door air temperature is as shown in the fol-
lowing figure.
2
4
LPT Disabled
LPT Detecting
Outdoor air temperature (˚C)
2) Defrosting conditions B
a) The conditions for ending the previous defrosting operation are a defrosting operation time up and a heating
operation after a compressor running time of 30 minutes after defrosting ends.
b) 5 minutes have passed since the compressor started.
c) 5 minutes have passed since the outdoor unit’s fan started running.
(iii) If any of the following conditions is established, this control ends and the fan runs at the fan tap set in item (d). (iii).
1) The outdoor air temperature (Tho-A) is in Zone A and the outdoor heat exchanger temperature (Tho-R1) is sensed to
be 30
°
C or higher continuously for 40 seconds or longer.
2) The outdoor unit’s fan speed is 500 min
-1
, and the outdoor heat exchanger temperature (Tho-R1) is sensed to be
30
°
C or higher continuously for 40 seconds or longer.
3) The outdoor heat exchanger temperature (Tho-R1) is sensed to be 45
°
C or higher continuously for 40 seconds or
longer.
