Outline Of Cooling Operation - Mitsubishi Heavy Industries SCM50ZS-W Service Manual

(ii) Hot keep operation
During the heating operation, the indoor fan speed can be controlled based on the temperature of the indoor heat ex-
changer (Th2) to prevent blowing of cold air.

(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)
(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 suction air temperature.
Model
Fan speed
AUTO
HI
MED
LO
(11) Outline of dehumidifying (DRY) operation
(a) Purpose of DRY mode
The purpose is "Dehumidification", and not to control the humidity to the target condition.
Indoor/outdoor unit control the operation condition to reduce the humidity, and also prevent over cooling.
(b) Outline of control
(i) Indoor unit fan speed and compressor are controlled by the area which is selected by the temperature difference.
Indoor unit
fan speed
Compressor
speed
(ii) The indoor unit check the current area by every 5 minutes, and operate by the next checking.
(c) Other
When the outdoor air temperature and room temperature is low in cooling operation, indoor unit can not operate in cooling,
and dehumidify. In this case, the units operate in heating to rise the indoor air temperature and after that start DRY operation.
(12) 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.
Thermostat ON
ON
ON
ON
OFF
SKM20ZSP-W
15-66rps
15-66rps
15-46rps
15-34rps
Indoor unit fan speed
D C
ULo(Lo) speed
Stop
Minimum
Stop
Setting temperature
Difference between set temperature and indoor air temperature
-
Cooling
Thermostat OFF
OFF
ON
OFF
(few minutes ON) (few minutes ON)
OFF
SKM25ZSP-W SKM35ZSP-W
15-74rps 15-98rps
15-74rps 15-98rps
15-52rps 15-74rps
15-38rps 15-46rps
Area
B A
Me speed
Limited （Lower than
normal cooling operation）
Limited
（Lower than the speed in"Area A"）
30
-
'19 • SCM-SM-281
Failure
OFF
ON
OFF
OFF