Heater Control (Fxtq-Ta Models) - Daikin REYQ-TA Series Service Manual

Outline of Control (Indoor Unit)

9.12 Heater Control (FXTQ-TA Models)

Note: Optional heater kit HKS... is required.
For FXTQ models, heater ON/OFF output from wiring adaptor interlocks with the operation of
heater kit HKS....(When the heater 1 turns ON/OFF, heater output of wiring adaptor turns ON/OFF.)
Fan residual operation also interlocks with the fan residual operation of heater kit HKS.... The
residual time will be 90 seconds. (Refer to 9.14 Fan Control (Heater Residual) (FXTQ-TA Models)
on page 111.)
9.12.1 Auxiliary Electric Heater Control
If heating is insufficient in heat pump system alone, an electric heater is to be used as the auxiliary
heater. The following shows the ON/OFF conditions for the electric heater.
• Heating/Automatic heating
&
• Auxiliary heater enabled: 1
Heater allowed
• Condition A
& • Time up
• Thermostat step 2: ON
H/P Heating: In operation
• Thermostat step 3: ON
• Time up
&
• Electric heater capacity
setting (∗5): Setting available
107
Heater not allowed
Heater 1: OFF
Heater 2: OFF
Thermostat OFF/Operation OFF
Thermostat ON
H/P Heating: In operation
Heater 1: OFF
Heater 2: OFF
Fan: ON
ENTRY/
5 minutes timer starts.
Heater 1: ON
Heater 2: OFF
Fan: ON
ENTRY/
5 minutes timer starts.
H/P Heating: In operation
Heater 1: ON
Heater 2: ON
(OFF for single heater)
Fan: ON
OR
Heater 1: OFF
Heater 2: OFF
Thermostat OFF
H/P In defrost/oil return
Condition B
Condition B
• Elimination of Condition A
OR
• Thermostat step 2: OFF
• Thermostat step 3: OFF
• Electric heater capacity setting:
OR
Setting not available
• Not in heating/Automatic heating
• Auxiliary heater enabled: 0 (∗3)
Thermostat OFF
Thermostat ON
Condition C
Heater 1: ON
Heater 2: OFF
Fan: ON
Elimination of
Condition B
Elimination of
Condition A
Functions and Control
SiUS371614E