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63
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'10 • SRK-T-098
(12) Protective control function
(a)
Frost prevention control
(During cooling or dehumidifying)
1)
Operating conditions
a) Indoor heat exchanger temperature (Th2) is lower than 5ºC.
b) 5 minutes after reaching the compressor command speed except 0 rps.
2)
Detail of anti-frost operation
3)
Reset conditions:
When either of the following condition is satisfied.
a) The indoor heat exchanger temperature (Th2) is 8ºC or higher.
b) The compressor command speed is 0 rps.
Indoor heat exchanger
temperature (ºC)
2.5
5
8
0 rps
Lower
limit
speed
compressor
command
speed
(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.
Notes (1) When the indoor heat exchanger temperature is in the range of 2.5~5ºC, the speed is reduced by 4 rps at each 20 seconds.
(2) When the temperature is lower than 2.5ºC, the compressor is stopped.
(3) When the indoor heat exchanger temperature is in the range of 5~8ºC, the compressor command speed is been maintained.
Indoor heat exchanger
temperature
Item
5°C or lower
2.5°C or lower
Lower limit of compressor command speed
22 rps
0 rps
Indoor fan
Depends on operation mode
Protects the fan tap just before
frost prevention control
Outdoor fan
Depends on command speed
Depends on stop mode
4-way valve
OFF
Item
SRK20~35ZJX-S
Outdoor air temperature
41°C or more
47°C or more
Lower limit speed
30 rps
40 rps
Model
(b)
The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the previous
operation mode, changes the operation mode.
(c)
When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is selected
during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.
(d)
Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals
of the wireless remote controller and the setting temperature.
Signals of wireless remote controller (Display)
–6
–5
–4
–3
–2
–1
±
0
+1
+2
+3
+4
+5
+6
Setting
temperature
Cooling
18
19
20
21
22
23
24
25
26
27
28
29
30
Dehumidifying
19
20
21
22
23
24
25
26
27
28
29
30
31
Heating
20
21
22
23
24
25
26
27
28
29
30
31
32
Unit : ºC
