81
3)
Operation of function component in defrosting
4)
Conditions for finishing defrosting
When any of the following conditions is met, the defrosting finishing operation will start.
1
When the outdoor heat exchanger thermistor temperature is 13
°
C or more for 70 seconds.
2
When the outdoor heat exchanger thermistor temperature is 25
°
C or more.
3
When 10 minutes has passed after the start of defrosting.
(f)
Defrosting
(i)
When the following conditions are met, the defrosting operation will start.
1)
During normal operation
a)
When 30 minutes has passed since the start of heating or 30 minutes after the last defrosting (Cumulative actual
operating time of compressor other than the outdoor unit frequency 0 Hz).
b)
When the outdoor heat exchanger thermistor temperature is –2
°
C or less for 3 continuous minutes after 27 minutes
have passed.
c)
Outdoor thermistor temperature (Th6) – Outdoor gas piping thermistor temperature
≤
0.44
×
Outdoor thermistor
tempe A
°
C or more. Avalue : Th6
≤
–2
°
C · 4, Th6 < –2
°
C · 6
d)
When the compressor is operating.
u
In addition, defrosting operation will start when the count of the decision frequency has become 0 Hz reaches 10
times or more and when all the conditions presented above in a), b) and d) are met.
2)
During defrosting acceleration
a)
When 30 minutes has passed since the last defrosting (Cumulative actual operating time of compressor other than
the outdoor unit frequency 0 Hz).
b)
When the compressor is operating.
u
In addition, defrosting operation will start when the count of the decision frequency has become 0 Hz reaches 10
times or more and when all the conditions presented above in a) and b) are met.
Note (1) Defrosting acceleration is when the finishing of the previous defrosting is according to the defrosting conditions of the 10 minutes that have
passed.
Outdoor unit frequency
Outdoor unit fan
4-Way valve
Electronic Expansion valve
(EEVA, B, C, D)
[Operating units]
Electronic Expansion valve
(EEVA, B, C, D)
[Stopped units]
Decision frequency
According to outdoor unit frequency
OFF
ON
OFF
0 Pulses
100
Pulses
According to outdoor unit frequency
Starting defrosting operation
Defrosting operation
Finishing defrosting
operation 2.
Finishing defrosting
operation 1.
100
seconds
0Hz
200 Pulses
A Pulses
At 1 or 2 units in operation : 470 pules
At 3 or 4 units in operation : 150 pules
B Hz
At 1 or 2 units in operation : 58 Hz
At 3 or 4 units in operation : 80 Hz
A Pulses
B Hz
110
sec.
Max. 60Hz
80
sec.
3 minutes
0Hz
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