Service Manual

CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series Functions SiUS181631EA
78 Functions and Control
COMFORT
AIRFLOW
Operation
CTXG, CTXS-L, FTXS-L Series

The fan speed is automatically controlled within the following steps.
Cooling
L tap ~ MH tap (same as AUTOMATIC)
Heating
In order to obtain a comfortable airflow, the fan speed may be set to a rate different from
automatic fan speed control.

The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
7.4 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.
★
Thermostat turns on also when the room temperature is in the zone B for 10 minutes.
Room thermistor
temperature at start-up
Target temperature
X
Thermostat OFF point
Y
Thermostat ON point
Z ★
24°C or more
(75.2°F or more)
Room thermistor
temperature at start-up
X – 2.5°C
(X – 4.5°F)
X – 0.5°C
(X – 0.9°F)
18 ~ 23.5°C
(64.4 ~ 74.3°F)
X – 2.0°C
(X – 3.6°F)
X – 0.5°C
(X – 0.9°F)
17.5°C or less
(63.5°F or less)
18°C
(64.4°F)
X – 2.0°C
(X – 3.6°F)
X – 0.5°C = 17.5°C
(X – 0.9°F = 63.5°F)
Zone A = Thermostat OFF
Target temperature X
Zone B
Room temperature Room temperature
Zone C = Thermostat ON
Y = X – 2.5°C (4.5°F)
or
Y = X – 2.0°C (3.6°F)
Z = X – 0.5°C (0.9°F)
X – 1.0°C (1.8°F)
(R24029)