'20 • SRF-SM-311
-
8
-
(14) Outline of cooling 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
(a) Operation of major functional components in cooling mode
(b) Detail of control in each mode (Pattern)
(i) Fuzzy operation
During the fuzzy operation, the air ow and the compressor speed are controlled by calculating the difference between
the room temperature setting correction temperature and the return air temperature.
12
-
86rps
12
-
86rps
12
-
58rps
12
-
48rps
SRF50ZSX-W
15
-
104rps
15
-
104rps
15
-
71rps
15
-
58rps
SRF35ZS-W
15
-
72rps
15
-
72rps
15
-
48rps
15
-
40rps
SRF25ZS-W
Fan speed
12
-
38rps15
-
46rps15
-
34rps
Auto
MED
HI
LO
ULO
-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 temperature
Model SRF50
SRF50
5) During continuous compressor operation
In addition, when the speed command from the indoor control of the indoor unit during heating operation has counted 0
rps 10 times or more and all conditions of 1), 2) and 3) above and the outdoor air temperature is 3°C or less are satised
(note that when the temperature for outdoor heat exchanger temperature sensor (TH1) is -5°C or less: 62 rps or more,
-4°C or less: less than 62 rps), defrost operation is started.
(ii) Ending conditions (Operation returns to the heating cycle when either one of the following is satised.)
1) Outdoor heat exchanger temperature sensor (TH1) : 13ºC (SRF50 : 10°C) or higher
2) Continued time of defrost operation → For more than 15 minutes
Max. 15 minutes
n
Depends on an operation condition, the time can be longer than 7 minutes.
2-7 minutes
Hot keep operation
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