Outline Of Cooling Operation - Mitsubishi Heavy Industries SRK25ZJ-S Technical Manual

e) 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 10 times or more and all conditions of a), b), c) and e) above and the outdoor air temperature is 3ºC or less are
satisfied (note that when the temperature for outdoor heat exchanger sensor (TH1) is － 5ºC or less: 62 rps or more,
－ 4ºC or less: less than 62 rps), defrost operation is started.
Ending conditions (Operation returns to the heating cycle when either one of the following is met.)
2)
a) Outdoor heat exchanger sensor (TH1) temperature: 13ºC or higher
b) Continued operation time of defrosting → For more than 16 minutes and 50 seconds.
Heating operation

(10) Outline of cooling operation

(a) Operation of major functional components in Cooling mode
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
(b) Detail of control in each mode (Pattern)
1) Fuzzy operation
During the fuzzy operation, the air flow and the compressor speed are controlled by calculating the difference between the
indoor temperature setting correction temperature and the return air temperature.
Fan speed
Auto
HI
MED
LO
(11) Outline of automatic operation
(a) Determination of operation mode
The unit checks the indoor air temperature and the outdoor air temperature, determines the operation mode, and then begins in
the automatic operation.
Indoor air temperature (˚C)
¡Defrast operation
Max. 16 minutes and 50 seconds
Depends on an operation condition, the time can be longer than 7 minutes.
Thermostat ON
ON
ON
ON
OFF
Model
SRK20ZJX-S
20~65rps
20~65rps
20~44rps
20~30rps
27.5
25.5
19.5
Cooling
Thermostat OFF
OFF
ON
OFF
(few minutes ON) (few minutes ON)
OFF
SRK25ZJX-S SRK35ZJX-S
20~74rps 20~86rps
20~74rps 20~86rps
20~55rps 20~58rps
20~34rps 20~38rps
Dehumidifying
Heating
18
Outdoor air temperature (˚C)
62
- -
'10 • SRK-T-098
2~7 minutes
Hot keep operation
Failure
OFF
OFF
OFF
OFF
Cooling
30