'09•SRK-DB-087D
(12)ޓProtective control function
(a) Frost prevention control
1) Operating conditions
2) Detail of anti-frost operation
3) Reset conditions:
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:
2) Detail of operation
3) Reset conditions:
(c) Cooling high pressure control
1) Purpose:
2) Detector:
3) Detail of operation:
53
58
63
Outdoor 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 (model 50 : 29) rps
(Example) Fuzzy
Indoor heat exchanger
temperature
Item
5°C or lower 2.5°C or lower
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
Item
SRK20~35ZJ-S SRK50ZJ-S
Outdoor air temperature
Lower limit speed
Model
a)
b)
a)
b)
a)
b)
a)
b)
(model 50 : 23 rps)
more, or 47ºC or more (model 50 : 41ºC or more) with the compressor running, the lower limit
41°C or more
29 rps
The lower limit of compressor command speed is set to 30 or 40 (model 50 : 29) rps and even if the calculated result
becomes lower than that after fuzzy calculation, the speed is kept to 30 or 40 (model 50 : 29) rps. However, when the
thermo becomes OFF, the speed is reduced to 0 rps.
'09•SRK-DB-087D
(b)
1)
2)
3)
(c)
(d)
27.5
25.5
18.0
18
30
(10)ޓOutline of cooling operation
(a)ޓOperation of major functional components in Cooling mode
(b) Detail of control in each mode (Pattern)
1) Fuzzy operation
ON OFF OFF
OFF OFF OFF
ON
OFF
(few minutes ON)
OFF
(few minutes ON)
ON ON OFF
Thermostat ON Thermostat OFF Failure
Cooling
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
20~98rps
20~98rps
20~58rps
20~38rps
SRK35ZJ-S
23~96rps
23~96rps
23~62rps
23~38rps
SRK50ZJ-S
20~74rps
20~74rps
20~55rps
20~34rps
SRK25ZJ-S
20~66rps
20~66rps
20~44rps
20~30rps
SRK20ZJ-S
Model
Fan speed
Auto
MED
HI
LO
(11)ޓOutline of automatic operation
(a) Determination of operation mode
Heating
Dehumidifying
Cooling
Indoor air temperature (˚C)
Outdoor air temperature (˚C)
Signals of wireless remote controller (Display)
–6 –5 –4 –3 –2 –1
±
0 +1 +2 +3 +4 +5 +6
Setting
temperature
Cooling
Dehumidifying
Heating
A
When both the indoor and the outdoor air temperatures are in the range “A”, cooling or heating is switched depending on
the difference between the setting temperature and the indoor air temperature.
When the operation mode has been judged following the change of setting temperature with the remote controller, the hourly
judgment of operation mode is cancelled.
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