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51
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'14 • SR-T-157
(d) Cooling low outdoor temperature protective control
(i) Operating conditions:
When the outdoor air temperature (TH2) is 22ºC 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 44 (30) rps and even if the speed becomes lower than 44
(30) rps, the speed is kept to 44 (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 50 (60) rps and even if the calculated result becomes
higher than that after fuzzy calculation, the speed is kept to 50 (60) rps.
Note (1) Values in ( ) are for outdoor air temperature is CºC or DºC
C
D
A
B
OFF
Upper limit 50 rps
Lower limit 44 rps
ON
ON
Upper limit 60 rps
Lower limit 30 rps
Outdoor air temperature (°C)
First time
Since the seconds
times
0
A
Outdoor air temp. (˚C)
B
3
7
10
¡
Values of A, B, C, D
C
D
22
25
25
28
(e) Heating high pressure control
(i) Purpose:
Prevents anomalous high pressure operation during heating.
(ii) Detector:
Indoor heat exchanger sensor (Th2)
(iii) Detail of operation:
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
continued 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.
A
B
C
D
Indoor unit 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 rps
(Example) Fuzzy
¡
Temperature list
Note (1) RPSmin: The lower one between the outdoor speed and the compressor command speed
Unit : ºC
(iii) Reset conditions:
When either of the following condition is satisfied
1)
The outdoor air temperature (TH2) is D ˚C or higher.
2)
The compressor command speed is 0 rps.
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
