Daikin REYQ8-48PY1B, Service Manual

Page: 162 / 477

Outline of Control (Indoor Unit) SiBE37-701_B
151 Function
6.6 Heater Control (Optional PCB 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 (S1NPH) of the outdoor 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
2ºC 2ºC
Set temperature
OFF
ON ON 43ºC 50ºC Liquid pipe temperature
OFF
ON 50ºC 60ºC
Condensing pressure
equivalent saturated
temperature
OFF