Outline Of Cooling Operation; Outline Of Automatic Operation - Mitsubishi Heavy Industries SRK20ZJ-S Data Book

10. Outline of cooling operation

(1) Operation of major functional components in Cooling mode
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
(2) Detail of control in each mode (Pattern)
(a) Fuzzy operation
During the fuzzy operation, the air f low and the compressor speed are controlled by calculating the difference between the
indoor temperature setting correction temperature and the return air temperature.
Model
Fan speed
Auto
HI
MED
LO

11. Outline of automatic operation

(1) Determination of operation mode
The unit checks the indoor air temperature and setting temperature and the outdoor air temperature, determines the operation
mode, and then begins in the automatic operation.
Indoor air temperature (˚C)
(2) The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the previous
operation mode, changes the operation mode.
(a) If the setting temperature is changed with the remote controller, the operation mode is judged immediately.
(b) When both the indoor and the outdoor air temperatures are in the range "A", cooling or heating is switched depending on the
difference between the setting temperature and the indoor air temperature.
(c) When the operation mode has been judged following the change of setting temperature with the remote controller, the hourly
judgment of operation mode is cancelled.
(3) When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is selected
during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.
(4) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals of
the wireless remote controller and the setting temperature.
Cooling
Setting
Dehumidifying
temperature
Heating
Cooling
Thermostat ON Thermostat OFF
ON
ON
ON
(few minutes ON)
OFF
SRK20ZJ-S SRK25ZJ-S
20~66rps 20~74rps
20~66rps 20~74rps
20~44rps 20~55rps
20~30rps 20~34rps
27.5
25.5
A
18.0
Heating
–6 –5 –4 –3
  0 
 0  
0   
-
Failure
OFF OFF
ON OFF
OFF OFF
(few minutes ON)
OFF OFF
SRK35ZJ-S
20~98rps
20~98rps
20~58rps
20~38rps
Cooling
Dehumidifying
18
Outdoor air temperature (˚C)
Signals of wireless remote controller (Display)
±0
–2 –1 +1
   
   
   

-
'09•SRK-DB-087D
30
+2 +3 +4 +5
   
   0
  0 
Unit : ºC
+6
0