Thermostat Control - Daikin FTXS09HVJU Service Manual

Main Functions
Ex: When the set point is 77°F (25°C)
Cooling Operation  73.4°F(23°C): Thermostat OFF 72°F(22°C): Switch to Heating
Operation
Heating Operation 79.7°F(26.5°C): Thermostat OFF  81.5°F(27.5°C): Switch to
Cooling Operation
1.6

Thermostat Control

Thermostat control is based on the difference between the room temperature and the setpoint.
Thermostat OFF Condition
 The temperature difference is in zone A.
Thermostat ON Condition
 The temperature difference is above zone C after being in zone A.
 The system resumes from defrost control in any zones except A.
 The operation turns on in any zones except A.
 The monitoring time has passed while the temperature difference is in zone B.
Cooling / Dry
28
Set point – Δ3.6ºF(2.0ºC)
=Thermostat OFF
Set point – Δ4.5ºF(2.5ºC)
(Cooling / Dry : 10 minutes, Heating : 10 seconds)
C
B
A
Cooling Operation
Heating Operation
Room temperature – set point
ON ON
Cooling : –Δ0.9°F (0.5°C)
Dry : –Δ0.9°F (0.5°C)
Cooling : –Δ3.6°F (2°C)
Dry : –Δ4.5°F (2.5°C)~–Δ3.6°F (2.0
OFF OFF
SiUS04-904
Set point + Δ4.5ºF(2.5ºC)
Set point + Δ2.7ºF(1.5ºC)
=Thermostat OFF
(R0271)
(R5465)
Function and Control