Program Dry Operation - Daikin 4MXS-R Series Service Manual

RA Indoor Unit Functions
2.3

Program Dry Operation

Outline
Program dry operation removes humidity while preventing the room temperature from lowering.
Since the microcomputer controls both the temperature and airflow rate, the temperature
adjustment and FAN setting buttons are inoperable.
Details
The microcomputer automatically sets the temperature and airflow rate. The difference between
the room thermistor temperature at start-up and the target temperature is divided into two zones.
Then, the unit operates in an appropriate capacity for each zone to maintain the temperature and
humidity at a comfortable level.
temperature at start-up
Thermostat turns on also when the room temperature is in the zone B for 10 minutes.
55
Room temperature
X – 1.0°C (1.8°F)
Y = X – 2.5°C (4.5°F)
or
Y = X – 2.0°C (3.6°F)
Room thermistor Target temperature
24°C or more
(75.2°F or more)
Room thermistor
temperature at start-up
18 ~ 23.5°C
(64.4 ~ 74.3°F)
17.5°C or less
(63.5°F or less)
Zone C = Thermostat ON
Zone B
Zone A = Thermostat OFF
Thermostat OFF point
X
X – 2.5°C
(X – 4.5°F)
X – 2.0°C
(X – 3.6°F)
18°C X – 2.0°C
(64.4°F) (X – 3.6°F)
SiUS121736EA
Room temperature
Target temperature X
Z = X – 0.5°C (0.9°F)
(R24029)
Thermostat ON point
Y Z
X – 0.5°C
(X – 0.9°F)
X – 0.5°C
(X – 0.9°F)
X – 0.5°C = 17.5°C
(X – 0.9°F = 63.5°F)
Functions and Control