'20 • SRF-SM-311
-
12
-
P1
P2
P3
Outdoor heat exchanger temperature (°C)
6 (8) rps
(1)
6 (8) rps
(1)
0rps
After lapse of 30 (20) sec. or over
(3)
After lapse of 30 (20) sec. or over
(3)
After lapse of 30 (20) sec. or over
(3)
lower limit
speed 30 rps
(Example)
Compressor speed
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3 ºC, the speed is reduced by 6 (8) rps at each 30 (20) seconds.
(2) When the temperature is P3 ºC or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of P1-P2 ºC, if the compressor command speed is been maintained and the operation has
continued for more than 30 (20) seconds at the same speed, it returns to the normal cooling operation.
(4) Value in ( ) are for the model SRF50.
(e) Cooling low outdoor temperature protective control
(i) Operating conditions
When the outdoor air temperature (TH2) is 22°C or lower continues for 20 seconds while the compressor command speed
is other than 0 rps.
(ii) Detail of operation
1) It controls the upper and lower limit values for the compressor speed according to the following table.
2) It checks the outdoor air temperature (TH2) once every hour to judge the operation range.
(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.
First time
SRF25,35
SRF50
After the
second times
First time
After the
second times
Outdoor air temperature (˚C)
A
C
E
D
B
F
0
22
-8
25
3
-5
5
25
-2
28
8
1
9
22
–
25
11
–
9
22
–
25
11
–
●Values of A, B, C, D, E, F
Outdoor air temperature
(°C)
Upper 2
Lower 2
ON
ON
Upper 3
Lower 3
ON
Upper 1
Lower 1
C
A
OFF
E
D
B
F
Compressor speed: Upper/lower limit (rps)
Upper 2 Lower 3 Upper 3
Lower 2
Lower 1
Upper 1
Range A
Range B
26
24
Indoor air temperature (
℃
Range A
Range B
50
50
50
44
60
30
Release
60
–
–
45
75
35
Release
SRF25, 35
SRF50
