Outdoor Fan Control At Low Outdoor Temperature; Refrigeration Cycle System Protection - Mitsubishi Heavy Industries SRK20ZSPR-S Technical Manual

Inverter wall mounted type residential air-conditioners
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(p)
Outdoor fan motor protection
(q)

Outdoor fan control at low outdoor temperature

(i)
Cooling
1)
Operating conditions:
2)
Detail of operation:
a)
b)
c)
3)
Reset conditions:
a)
b)
(ii)
Heating
1)
Operating conditions:
2)
Detail of operation:
3)
Reset conditions:
a)
The outdoor air temperature (TH2) is 6ºC (model SRK45 : 2ºC) or higher.
b)
(r) Refrigeration cycle system protection
(i) Starting conditions
1)
When 5 minutes have elapsed after the compressor ON or the completion of the defrost operation.
2)
Other than the defrost operation.
3)
When, after satisfying the conditions of 1) and 2) above, the compressor speed, indoor air temperature (Th1) and indoor
heat exchanger temperature (Th2) have satisfied the conditions in the following table for 10 (model SRK45 : 5) minutes:
Operation mode
Cooling
Heating(1)
Except that the fan speed is HI in heating operation.
(ii) Contents of control
1)
When the conditions of (i) above are satisfied, the compressor stops.
2)
Error stop occurs when the compressor has stopped 3 times within 60 minutes.
(iii) Reset condition
When the compressor has been turned OFF.
min
- 1
Outdoor temperature > 10˚C
Outdoor temperature < = 10˚C
When the outdoor air temperature (TH2) is 4ºC (model SRK45 : 0ºC) or lower continues
for 30 seconds while the seconds while thecompressorcommand speed is other than 0 rps.
Compressor speed (N)
Indoor air temperature (Th1)
< =
50 N
10 Th1 40
0 Th1 40
50 N
< =
-
Outdoor fan
Indoor air temperature (Th1)/
Indoor heat exchanger temperature (Th2)
< =
< =
< =
< =
75
-
'17 • SRK-T-206
Th1 4<Th2
Th2<Th1+6

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