Mitsubishi Heavy Industries SRK63ZR-W Technical Manual page 49

P1
Outdoor heat exchanger temperature (°C)
Notes(1) When the outdoor heat exchanger temperature is in the range of P2 - P3, the speed is reduced by 8 rps at each 20 seconds.
Notes(2) When the temperature is P3 or higher, the compressor is stopped.
Notes(3) When the outdoor heat exchanger temperature is in the range of P1 - P2, if the compressor command speed is been maintained and the operation has
continued for more than 30 seconds at the same speed, it returns to the normal cooling operation.
(e) Cooling low outdoor air temperature protective control
(i) Operating conditions
When the outdoor air temperature (TH2) is 22℃ or lower continues for 20 seconds while the compressor
command speed is other than 0 rps.
(ii) Detail of operation
1) The lower limit of the compressor command speed is set to B (D) rps and even if the speed becomes lower than
40 (30) rps, the speed is kept to 40 (30) rps. However, when the thermo OFF, the speed is reduced to 0 rps.
2) The upper limit of the compressor command speed is set to A (C) rps and even if the calculated result becomes
higher than that after fuzzy calculation, the speed is kept to A (C) rps.
Note(1) Values in ( ) are for outdoor air temperature is 0℃.
Upper limit C rps
ON
Lower limit D rps
0 3
Outdoor air temperature ( °C)
(iii) Reset conditions
When either of the following condition is satisfied.
1) The outdoor air temperature (TH2) is 25
2) The compressor command speed is 0 rps.
(f) Heating high pressure control
(i) Purpose
(ii) Detector
(iii) Detail of operation
(Example) Fuzzy
P4
fan
Temperature list
Model SRK63ZR-W
RPSmin < 45
< =
45 RPSmin < 115
115 < =
RPSmin < 120
120 < = RPSmin
Models SRK71, 80ZR-W
< =
RPSmin 50
< =
50 RPSmin < 90
< =
90 RPSmin < 108
108 < =
RPSmin < 120
120 < = RPSmin
P2
Upper limit A rps
ON
Lower limit B rps
OFF
22 25
℃
temperature
After lapse of E sec. or over
After lapse of E sec. or over
After lapse of E sec. or over
P1
Indoor heat exchanger temperature (°C)
5 seconds
E
P1
45
45
45 - 43 52 - 50
43
P1
45
45
45 - 44 52 - 48
44 - 43 48 - 45
43
48
-
P3
●Compressor command speed
A
Model 63 70
Model 71, 80 75
or higher.
4rps 8rps
(3) (1)
4rps
(1)
(3)
lower limit
(3)
speed F rps
P2 P3
P2-P3
P3-P4
P1-P2
fan
P2 P3
54.5 - 56
52
52 56
56 - 55
50 55
P2 P3
52 57
52 57
57 - 52
52 - 48
45 48
-
31 32
Outdoor air temperature ( °C)
'18 • SRK-T-253
(Unit : rps)
B
C D
B-1 B-2
35 Cancel 60 60
30 Cancel 60 40
Range B-2
Range B-1
24 26
Room temperature ( °C)
(2)
E
8rps
(2)
Model 63 10
20
Model 71, 80
0rps
P4
E
E
P4
56.5
57.0
56.5
56.5
P4
57.5
56.5
51.5
51.5
F
35
30