Outline of Control (Indoor Unit)
SiME332106E
82
Part 4 Functions and Control
8.13 Heater Control (Optional PCB KRP1B series 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 below.
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
Set temperature
OFF
2ºC
2ºC
ON
43ºC
50ºC Liquid pipe temperature
OFF
ON
50ºC
60ºC
OFF
Condensing pressure
equivalent saturated
temperature
