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34
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'10 • SRK-T-100
(10) Protective control function
(a) Frost prevention for indoor heat exchanger
(During cooling or dehumidifying)
1) Operating conditions
a
) Indoor heat exchanger temperature (Th2) is lower than 5ºC.
b) 8 minutes after reaching the compressor command speed except 0 rps.
2) Detail of anti-frost operation
5°C or lower
2.5°C or lower
Item
model 25 : 44 rps
Upper limit speed
model 35 : 70 rps
0rps
model 50 : 76 rps
Indoor fan
Depends on operation mode Protects the fan tap just before
frost prevention control
Outdoor fan
Depends on operation mode
Depends on stop mode
4-way valve
OFF
3) Reset conditions:
The indoor heat exchanger temperature (Th2) is 8ºC or higher after 5 minutes of operation following
control of the compressor command speed upper is 0 rps.
Indoor heat exchanger
temperature
Indoor heat exchanger
temperature (ºC)
2.5
5
8
0 rps
Upper
limit
speed
Compressor
command
speed
(b) Cooling overload protective control
1) Operating conditions:
When the outdoor unit is operating with the compressor command speed of other than 0 rps, and when
the outdoor air temperature sensor (TH2) becomes 41ºC or over for 30 seconds continuously.
2) Detail of operation
a
) Outdoor fan is stepped up by 3 speed step. (Upper limit speed is 7th speed.)
b
) The lower limit of compressor command speed is set to 30 rps and even if the calculated result becomes lower than that
after fuzzy calculation, the speed is kept to 30 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
) When the outdoor air temperature becomes 40ºC or less.
b
) When the compressor command speed is 0rps.
(c) Heating high pressure control
1) Purpose:
Prevents anomalous high pressure operation during heating.
2) Detector:
Indoor heat exchanger sensor (Th2)
3) Detail of operation:
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(37) rps
(Example) Fuzzy
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 over for 1 minute continuously, 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.
(5) Value in ( ) are for the model 18.
¡
Temperature list
Model 25.35
Unit : ºC
A
B
C
D
RPSmin < 50
48
53
55
58
50 <= RPSmin < 91
48.5
56
58
61
91 <= RPSmin < 97
48.5
56~53
58
61
97 <= RPSmin < 100
48.5
53~51
58~56
61
100 <= RPSmin < 115
48.5~40.1
51~42
56~47.3
61
115 <= RPSmin
40.1
42
47.3
61
