Control functions
2.5 Actuator control
2.5.1 Heating/Cooling valves
The unit has two digital outputs for heating and cooling thermal actuator control, i.e. terminals Heat and
Cool. For thermal actuators Heat is always configured for heating valve and Cool for cooling valve. If heating
is needed, Heat is On and Cool is Off, and if cooling is needed Cool is On and Heat is Off.
2.5.2 Actuator control settings
Parameter Description
31 DO HeatNormally closed (NC) / Normally open (NO)
0 = NO
1 = NC
32 DO Cool Normally closed (NC) / Normally open (NO)
0 = NO
1 = NC
Modbus register Modbus address Description
Coil register 15 DO Heat Normally closed (NC) / Normally open (NO)
0 = NO
1 = NC
Coil register 16 DO Cool Normally closed (NC) / Normally open (NO)
0 = NO
1 = NC
2.6 Controller states
Controller state is a function that makes it possible for the room HVAC system to operate with priority on
comfort or energy saving.
The following controller states are available for use and the thermostat always operates in one of them:
✓ Off
✓ Standby
✓ Occupied
NNoottee!! The calculated setpoint is different when the thermostat is in Occupied state compared to
Standby state due to different hystereses. See chapter 2.2.1 for more information.
12 RCFD-230C manual, Rev. A
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