Daikin RXYQ96PYDN, Service Manual

Page: 310 / 567

SiUS34-801A_b Heater Control (Optional PC Board KRP1B ... is required.)
Indoor Unit 295
8. Heater Control (Optional PC Board KRP1B ... is
required.)
The heater control is conducted in the following manner.
[Normal control]
While in heating operation, the heater
control (ON/OFF) is conducted as shown
on the right.
[Overload control]
When the system is overloaded in
heating operation, the heater will be
turned OFF in the following two
manners:
(1) The heater control (ON/OFF) is
conducted through the liquid pipe
temperature (R2T) of the indoor
unit.
(2) The heater control (ON/OFF) is
conducted by converting the
heater temperature into the
condensing pressure equivalent
saturated temperature (Tc)
according to the temperature
detection through the high
pressure sensor (SINPH) of the outside unit.
[Fan residual operation]
While the heater turns OFF, in order to prevent the activation of the thermal protector, the fan
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
ON Set temperature
OFF
3.6ºF 3.6ºF
ON 109.4ºF 122ºF Liquid pipe temperature
OFF
ON 122ºF 140ºF
OFF
Condensing pressure
equivalent saturated
temperature