-
38
-
'14 • SRK-T-170
(c)
Cooling overload protective control
(i) Operating conditions:
When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41ºC or
more, or 47ºC or more with the compressor running, the lower limit speed of compressor is
brought up.
(ii) Detail of operation
1)
The outdoor fan is stepped up by 3 speed step. (Upper limit 7th speed.)
2)
The lower limit of compressor command speed is set to 30 or 40 rps and even if the calculated result becomes lower than that
after fuzzy calculation, the speed is kept to 30 or 40 rps. However, when the thermo OFF, the speed is reduced to 0 rps.
(iii) Reset conditions:
When either of the following condition is satis
¿
ed.
1)
The outdoor air temperature is lower than 40ºC.
2)
The compressor command speed is 0 rps.
Item
SRK25, 35ZXA-S/SS/SB/SR
Outdoor air temperature
41°C or more
47°C or more
Lower limit speed
30 rps
40 rps
Model
(d) Cooling high pressure control
(i) Purpose:
Prevents anomalous high pressure operation during cooling.
(ii) Detector:
Outdoor heat exchanger sensor (TH1)
(iii) Detail of operation:
53
58
63
Outdoor heat exchanger temperature(°C)
6rps
(1)
6rps
(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)
(Example) Fuzzy
Notes (1) When the outdoor heat exchanger temperature is in the range of 58-63 ºC, the speed is reduced by 6 rps at each 20 seconds.
(2) When the temperature is C ºC or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of 53-58 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 cooling operation.
(
i
) Operat
i
ng cond
i
t
i
on
s
:
(
ii
) Deta
i
l of operat
i
on:
1)
2)
than 50 <44> (30) rps, the speed is kept to 50
<44> (30) rps. However, when the thermo OFF, the speed is
A
C
B
D
(e)
Cooling low outdoor air temperature protective control
