Heater Control (Optional Pcb Krp1B - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301
9.9 Heater Control (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 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
Function 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 condensing unit.
ON
ON 109.4ºF
ON 122ºF
Outline of Control (Indoor Unit)
Set temperature
3.6ºF 3.6ºF
122ºF Liquid pipe temperature
OFF
Condensing pressure
140ºF
equivalent saturated
temperature
OFF
OFF
75