Mitsubishi Heavy Industries SRF25ZMXA-S, Technical Manual & Parts List, Page: 50 / 126

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'14 • SRF-T-163
Heating operation
¡ Defrost operation
(Model SRF50 Max.18 minutes)
̪ Depends on an operation condition, the time can be longer than 7 minutes.
2~7 minutes
̪
Hot keep operation
Max. 16 minutes and 50 seconds
) During continuous compressor operation
In addition, when the speed command from the indoor controller of the indoor unit during heating operation has
counted 0 rps 0 times or more and all conditions of ), ), ) and ) above and the outdoor air temperature is
ºC
or less are satisfied (note that when the temperature for outdoor heat exchanger sensor (TH1) is － ºC or less:
rps or more, － ºC or less: less than rps), defrost operation is started.
(ii) Ending conditions (Operation returns to the heating cycle when either one of the following is met.)
) Outdoor heat exchanger sensor (TH) temperature: ºC (model SRF0 : 0ºC) or higher.
) Continued operation time of defrosting → For more than 16 minutes and 50 seconds (model SRF50 : 18 minutes).
(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 flow and the compressor speed are controlled by calculating the difference between
the room temperature setting correction temperature and the return air temperature.
12
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86rps
12
-
86rps
12
-
58rps
12
-
48rps
SRF50ZMXA-S
20
-
104rps
20
-
104rps
20
-
70rps
20
-
58rps
SRF35ZMXA-S
20
-
72rps
20
-
72rps
20
-
48rps
20
-
40rps
SRF25ZMXA-S
Model
Fan speed
12
-
38rps 20
-
46rps 20
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34rps
Auto
MED
HI
LO
ULO