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

SiUS371614E

9.11 Heater Control (Except FXTQ-TA Models)

Note: Optional PCB KRP1B ... is required.
The heater control is conducted in the following manner.
Normal control
While in heating, the heater control (ON/
OFF) is conducted as shown on the right.
Overload control When the system is overloaded in
heating, the heater will be turned
OFF in the following 2 manners.
(1) The heater control (ON/OFF) is
(2) The heater control (ON/OFF) is
Fan residual While the heater turns OFF, in order to prevent the activation of the thermal protector, the fan
operation conducts residual operation for a given period of time after the heater turns OFF. (This operation is
conducted regardless of with or without heater equipped.)
Residual operation time: 100 seconds on ceiling suspended type or 60 seconds on other types
Functions and Control
conducted through the liquid
pipe temperature (R2T) of the
indoor unit.
conducted by converting the
heater temperature into the
condensing pressure equivalent
saturated temperature (Tc)
according to the temperature
detection through the high
pressure sensor (S1NPH) of the outdoor unit.
ON
(3.6˚F)
ON 43˚C (109.4˚F)
ON 50˚C (122˚F)
Outline of Control (Indoor Unit)
Set temperature
2˚C 2˚C
(3.6˚F)
50˚C (122˚F)
Liquid pipe temperature
OFF
60˚C (140˚F)
Condensing pressure
equivalent saturated
temperature
OFF
OFF
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