Daikin VRV-WIII RWEYQ72PTJU Service Manual page 78

Outline of Control (Indoor Unit)
Heating
When controlling the indoor unit by the suction air thermistor of the indoor unit alone, the indoor unit
may be placed in thermos-off due to the room temperature being measured at the indoor unit's
suction air thermistor before the lower part of the room reaches the set temperature. The indoor
unit can be controlled so that the lower part of the room does not become cold. By using he
combination of both the indoor unit suction air thermistor and remote controller thermistor, the point
at which the room temperature is measure wills witch between the thermistors based upon the
temperature differential. At high room temperatures, the suction air thermistor will be used. As the
room temperature approaches the set temperature, the room temperature sensing will be switched
to the remote controller thermistor to ensure the lower part of the room is not cold.
Set temperature
(Ts)
 Ex: When heating
Assuming the set temperature in the figure is 75°F or more, and the suction air temperature
has changed from 64°F to 82°F (A  D):
(This example also assumes there are several other air conditioners, the system is OFF, and that
temperature changes even when the thermostat is OFF.)
Suction air thermistor () in indoor unit is used for temperatures from 64°F to 77°F (A  C).
Room temperature thermistor in remote controller is used for temperatures from 77°F to 82°F (C 
D).
And, assuming suction air temperature has changed from 82°F to 64°F (D  A):
Room temperature thermistor in remote controller is used for temperatures from 82°F to 73°F (D 
B).
Suction air thermistor () in indoor unit is used for temperatures from 73°F to 64°F (B  A).
 For FXTQ: Remote sensor (Optional accessory)
Note:
70
Range in which room
temperature thermistor in remote
controller can be used
Range in which suction air
thermistor (∗) in indoor unit
can be used
SiUS30-1301
Suction air temperature (TH1)
Differential
Function and Control