-
41
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'12 • SRK-T-126
(b) Cooling overload protective control
1)
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.
2) Detail of operation
a) The outdoor fan is stepped up by 3 speed step. (Upper limit 7th speed.)
b) 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 becomes OFF, the
speed is reduced to 0 rps.
3) Reset conditions:
When either of the following condition is satisfied.
a)
The outdoor air temperature is lower than 40ºC or 46ºC.
b) The compressor command speed is 0 rps.
(c) Cooling high pressure control
1) Purpose:
Prevents anomalous high pressure operation during cooling.
2) Detector:
Outdoor heat exchanger sensor (TH1)
3) Detail of operation:
53
58
63
Outdoor unit heat exchanger temperature (°C)
6rps
(1)
6rps
(1)
0rps
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
lower limit
speed 30 rps
(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 30 seconds.
(2) When the temperature is 63 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 30 seconds at the same speed, it returns to the normal cooling operation.
Model
Item
FDTC25, 35VF
Outdoor air temperature
More than 41 at less than 47
47°C or more
Lower limit speed
30 rps
40 rps
(d) Cooling low outdoor temperature protective control
1) 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.
2) Detail of operation:
a)
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 becomes OFF, the speed is reduced to 0 rps.
b)
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 22ºC or 25ºC
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
