Heater Control (Optional Pcb Krp1B Series Is Required.) - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

SiUS331604E

6.10 Heater Control (Optional PCB KRP1B series is required.)

Heater control is conducted in the following manner.
Normal control
While in heating operation, 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) Heater control (ON/OFF) is conducted through
the liquid pipe temperature (R2T) of the indoor
unit.
(2) 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
whether or not a heater is equipped.)
Residual operation time: 100 seconds on ceiling suspended type or 60 seconds on other types
Functions and Control
ON
(3.6˚F)
43ºC
ON
(109.4˚F)
50ºC
(122˚F)
ON
Outline of Control (Indoor Unit)
Set temperature
2ºC 2ºC
(3.6˚F)
50ºC
(122˚F) Liquid pipe temperature
OFF
60ºC
(140˚F) Condensing pressure
equivalent saturated
temperature
OFF
OFF
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