Thermostat Control While In Normal Operation; Thermostat Control In Dry Operation - Daikin RTSQ20PY1 Service Manual

Outline of Control (Indoor Unit)

9.2.3 Thermostat Control while in Normal Operation

VRV multi systems are set at factory to thermostat control mode using the remote controller.
While in normal thermostat differential control mode (i.e., factory setting mode), the thermostat
turns OFF when the system reaches a temperature of -1°C from the set temperature while in
cooling operation or of +1°C from that while in heating operation.
Cooling operation:
Heating operation:
While in a single remote controller group control, the body thermostat is only used for this
control.
Furthermore, while in heating operation, cassette-mounted indoor units conduct the thermostat
control by a value compensated by -2°C for the value detected with the body thermostat.
(Through field settings, the thermostat differential setting can be changed from 1°C to 0.5°C.
For details on the changing procedure, refer to information on page onward.)

9.2.4 Thermostat Control in Dry Operation

While in dry operation, the thermostat control is conducted according to suction air temperature
at the time of starting the dry operation.
Assuming that the suction air temperature at the time of starting the dry operation is Tro and the
suction air temperature in operation is Tr,
when Tro ≤ 24.5ºC:
when Tro > 24.5ºC:
Furthermore, while in dry operation mode, fans operate at L flow rate, stops for a period of six
minutes while the thermostat is OFF, and then return to operation at L flow rate. (This control is
used to prevent a rise in indoor temperature while in thermostat OFF mode.)
119
Tr < Set temperature -1ºC
Normal
Thermostat OFF
operation
Tr > Set temperature +1ºC
Normal
Thermostat OFF
operation
Tr < Tro - 1ºC
In dry operation
Tr < Tro - 1.5ºC
In dry operation
Tr: Temperature detected with the suction
air thermistor (R1T)
Tro: Suction air temperature at the
Thermostat OFF
time of starting the dry operation
Tr: Temperature detected with the
Thermostat OFF
suction air thermistor (R1T)
SiBE31-801_C
Function