Mitsubishi Heavy Industries SRK60ZJX-S, Technical Manual

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134
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'10 • SR-T-091
(f) Heating overload protective control
1) Operating conditions:
When the outdoor air temperature (TH2) is 22ºC (model 50, 60 : 17ºC) or higher continues for
30 seconds while the compressor command speed other than 0 rps.
2) Detail of operation:
a) Taking the upper limit of compressor command speed range at 60 rps (model 50, 60 : 50 rps), if the output speed
obtained with the fuzzy calculation exceeds the upper limit, the upper limit value is maintained.
b) The lower limit of compressor command speed is set to 40 rps (model 50, 60 : 35 rps) and even if the calculated
result becomes lower than that after fuzzy calculation, the speed is kept to 40 rps (model 50, 60 : 35 rps). However,
when the thermo becomes OFF, the speed is reduced to 0 prs.
c) Inching prevention control is activated and inching prevention control is carried out with the minimum speed set at
40 rps (model 50, 60 : 35 rps).
d) The outdoor fan is set on 2nd speed.
e) The indoor fan is stepped up by 1 speed step. (Upper limit 8th speed)
3) Reset conditions:
The outdoor air temperature (TH2) is lower than 21ºC (model 50, 60 : 16ºC).
(e) Heating high pressure control
1) Purpose: Prevents anomalous high pressure operation during heating.
2) Detector:
Indoor heat exchanger sensor (Th2)
3) Detail of operation:
A
B C D
Indoor heat exchanger temperature(°C)
4rps (1) 8rps (2)
8rps (2) 4rps (1)
0rps
After lapse of 20 sec. or over (3)
After lapse of 20 sec. or over (3)
After lapse of 20 sec. or over (3)
lower limit
speed 30(model 50, 60:35)rps
(Example) Fuzzy
Notes (1) When the indoor heat exchanger temperature is in the range of B~C ºC, the speed is reduced by 4 rps at each 20 seconds.
(2) When the indoor heat exchanger temperature is in the range of C~D ºC, the speed is reduced by 8 rps at each 20 seconds. When the temperature is D ºC
or higher continues for 1 minute, the compressor is stopped.
(3) When the indoor heat exchanger temperature is in the range of A~B ºC, if the compressor command speed is been maintained and the operation has contin-
ued for more than 20 seconds at the same speed, it returns to the normal heating operation.
(4) Indoor blower retains the fan tap when it enters in the high pressure control. Outdoor blower is operated in accordance with the speed.
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Temperature list
A B C D
RPSmin < 50
48 53 55 58
50 <= RPSmin < 95
48.5 56 58 61
95 <= RPSmin < 97
48.5 56 ~ 55.5 58 61
97 <= RPSmin < 104
48.5 55.5 ~ 51.5 58 ~ 53.5 61
104 <= RPSmin < 115
48.5 ~ 42.1 51.5 ~ 44 53.5 ~ 47.3 61
115 <= RPSmin
42.1 44 47.3 61
Note (1) RPSmin: The lower one between the outdoor speed and the compressor command speed
Models 20~35
A B C D
RPSmin < 88
48.5 56 58 61
88 <= RPSmin < 108
44 51.5 53.5 56.5
108 <= RPSmin
39 46.5 48.5 51.5
Models 50, 60
Unit : ºC
Note (1) RPSmin: The lower one between the outdoor speed and the compressor command speed
Unit : ºC