Mitsubishi Heavy Industries SRK60ZJX-S, Technical Manual

Page: 132 / 272

- 131 -
'10 • SR-T-091
27.5
25.5
19.5
18
30
(10) Outline of cooling operation
(a) Operation of major functional components in Cooling mode
(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.
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
12~86rps
12~86rps
12~62rps
12~34rps
SRK50ZJX-S
20~86rps
20~86rps
20~58rps
20~38rps
SRK35ZJX-S
20~74rps
20~74rps
20~55rps
20~34rps
SRK25ZJX-S
20~65rps
20~65rps
20~44rps
20~30rps
SRK20ZJX-S
Model
Fan speed
12~110rps
12~110rps
12~86rps
12~48rps
SRK60ZJX-S
Auto
MED
HI
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.
Heating
Dehumidifying
Cooling
Indoor air temperature (˚C)
Outdoor air temperature (˚C)
Max. 16 minutes and 50 seconds
Heating operation
¡ Defrast operation
(Mode 50, 60 Nax.18 minutes)
̪
Depends on an operation condition, the time can be longer than 7 minutes.
2~7 minutes
̪
Hot keep operation
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.
2)
Ending conditions (Operation returns to the heating cycle when either one of the following is met.)
a) Outdoor heat exchanger sensor (TH1) temperature: 13ºC (model 50, 60 : 10ºC) or higher
b) Continued operation time of defrosting → For more than 16 minutes and 50 seconds (model 50, 60 : 18 minutes).