Outline Of Dehumidifying (Dry) Operation - Mitsubishi SCM40ZS-S Technical Manual

(9) 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 for cooling operation, indoor unit can not operate in cooling.
and dehumidifying. In this case, the units operate in heating to rise the room temperature, and after that start DRY operation.
(10) 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)
(b) 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.
(i) If the setting temperature is changed with the wireless remote control, the operation mode is judged immediately.
(ii) 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.
(iii) When the operation mode has been judged following the change of setting temperature with the wireless remote control, the
hourly judgment of operation mode is cancelled.
(c) 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.
(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals
of the wireless remote control and the setting temperature.
Cooling
Setting
Dehumidifying
temperature
Heating
Indoor unit fan speed
D C
ULo(Lo) speed
STOP
Minimum （Lower than the speed in "Area A"）
STOP
Setting temperature
Difference between setting temperature and return temperature.
27.5
25.5
18.0
–6 –5 –4
18 19 20
19 20 21
20 21 22
Area
B A
Me speed
Limited（Lower than normal cooling operation）
Limited
A Dehumidifying
Heating
18
Outdoor air temperature (˚C)
Signals of wireless remote control (Display)
–3 –2 –1 ±0
21 22 23 24
22 23 24 25
23 24 25 26
165
- -
'16 • SCM-T-199
Cooling
30
+1 +2 +3 +4
25 26 27 28
26 27 28 29
27 28 29 30
+5 +6
29 30
30 31
31 32