'20 • SRF-SM-311
-
7
-
(b) Details of control at each operation mode (pattern)
(i) Fuzzy operation
Deviation between the room temperature setting correction temperature and the return air temperature is calculated in
accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed.
When the defrost operation, protection device, etc. is actuated, operation is performed in the corresponding mode.
(ii) Hot keep operation
If the hot keep operation is selected during the heating operation, the indoor blower is controlled based on the temperature
of the indoor heat exchanger (Th2) to prevent blowing of cool wind.
However, if the fan speed setting is Hi and room temperature is 19ºC or higher, this control is not executed.
12
-
110rps
12
-
110rps
12
-
80rps
12
-
70rps
SRF50ZSX-W
20
-
115rps
20
-
115rps
20
-
98rps
20
-
92rps
SRF35ZS-W
20
-
102rps
20
-
102rps
20
-
76rps
20
-
66rps
SRF25ZS-W
Model
Fan speed
Auto
MED
HI
LO
12
-
60rps
20
-
80rps
20
-
58rps
ULO
(c) Defrost operation
(i) Starting conditions (Defrost operation can be started only when all of the following conditions are satisfied.)
1) After start of heating operation
When it elapsed 35 minutes (Accumulated compressor operation time)
2) After end of defrost operation
When it elapsed 35 minutes (Accumulated compressor operation time)
3) Outdoor heat exchanger temperature sensor (TH1)
When the temperature has been below -5ºC for 3 minutes continuously
4) The difference between the outdoor air sensor temperature and the outdoor heat exchanger sensor temperature (TH2-TH1)
¡
The outdoor air temperature
≧
0°C (SRF50 :
≧
-2ºC) : 7°C or higher
¡
-15°C
≦
The outdoor air temperature
＜
0°C (SRF50 :
≧
-2ºC) : 3/15 × The outdoor air tempe 7°C or higher (SRF25)
4/15 × The outdoor air tempe 7°C or higher (SRF35, 50)
¡
The outdoor air temperature < -15°C : -5°C or higher
-20
-20
-15
-10
-5
0
5
10
-15
-10
-5
0
Outdoor air temperature (
℃
)
Outdoor heat exchanger temperature (
℃
)
-20
-20
-15
-10
-5
0
5
10
-15
-10
-5
0
Outdoor air temperature (
℃
)
Outdoor heat exchanger temperature (
℃
)
Defrost operation
start
Defrost operation
start
Defrost operation start temperature
Defrost operation start temperature
Models 20
～
35
Model 50
-20
-20
-15
-10
-5
0
5
10
-15
-10
-5
0
Outdoor air temperature (
℃
)
Outdoor heat e
xchanger temperature (
℃
)
-20
-20
-15
-10
-5
0
5
10
-15
-10
-5
0
Outdoor air temperature (
℃
)
Outdoor heat e
xchanger temperature (
℃
)
Defrost operation
start
Defrost operation
start
Defrost operation start temperature
Defrost operation start temperature
Models 20
～
35
Model 50
SRF25
SRF35
