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(4) Cooling low outdoor temperature protective control
(a) Operating conditions:
When the outdoor air temperature (TH) is ºC or lower continues for 0 seconds while the
compressor command speed is other than 0 rps.
(b) Detail of operation:
) The lower limit of the compressor command speed is set to (0) rps and even if the speed becomes lower than (0)
rps, the speed is kept to 44 (30) rps. However, when the thermo becomes OFF, the speed is reduced to 0 rps.
) The upper limit of the compressor command speed is set to 0 (0) rps and even if the calculated result becomes
higher than that after fuzzy calculation, the speed is kept to 0 (0) rps.
Note () Values in ( ) are for outdoor air temperature is ºC or ºC
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 temp.(°C)
First time
Since the seconds
times
0
A
Outdoor air temp. (˚C)
B
C
D
0
¡
Values of A, B, C, D
(c) Reset conditions:
When either of the following condition is satisfied
) The outdoor air temperature (TH) is D ºC or higher.
) The compressor command speed is 0 rps.
(5) Heating high pressure control
(a) Purpose:
Prevents anomalous high pressure operation during heating.
(b) Detector:
Indoor heat exchanger sensor (Th)
(c) 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 () When the indoor heat exchanger temperature is in the range of B~C ºC, the speed is reduced by rps at each 0 seconds.
() When the indoor heat exchanger temperature is in the range of C~D ºC, the speed is reduced by rps at each 0 seconds. When the temperature is D ºC
or higher continues for minute, the compressor is stopped.
() 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 0 seconds at the same speed, it returns to the normal heating operation.
() Indoor blower retains the fan tap when it enters in the high pressure control. Outdoor blower is operated in accordance with the speed.
¡
Temperature list
Unit : ºC
A
B
C
D
RPSmin < 50
50 <= RPSmin < 104
.
104 <= RPSmin
.
.
Note () RPSmin: The lower one between the outdoor speed and the compressor command speed
Model : 0~
A
B
C
D
RPSmin < 88
.
88 <= RPSmin < 108
.
.
.
108 <= RPSmin
.
.
.
Model : 0, 0
Unit : ºC