SDC / DHC

Control Functions

 

 

Operation with room temperature sensing

As long as the room temperature is above the set room setpoint, the heating circuit pumps are running if outside temperatures are below the set freezing limit.

If the room temperature drops below the set room setpoint, heating is resumed.

Switch-off occurs again when the room temperature exceeds the set room setpoint by 1 K. If at this moment the outside temperature is still below the set freezing limit, only the heating circuit pumps remain active.

NOTE If not every heating circuit is operated with room temperature sensing, different frost protection functions can be assigned to the individual heating circuits. If, for example, a mixed heating circuit is operated with room temperature sensing and the direct heating circuit is not, the latter's heating curve and room temperature setpoint are to be set as low as possible.

In connection with a second outside sensor, the frost protection function is activated as soon as one of the two outside temperatures drops below the frost protection limit. In case of a faulty outside sensor, frost protection is activated continuously.

ATTENTION

In connection with a room sensor, the thermostat function is not active with active frost protection.

See also 5.2.3 "System Parameters" menu, Pg. 72

Cycle operation

The frost protection function is activated as soon as the temperature drops below the set frost protection limit ("System Parameters" menu, parameter 05). The frost protection function becomes effective when frost protection is active and there is no demand by the heating circuit.

EN2H-0221GE51 R0808

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Honeywell EN2H-0221GE51 R0808 service manual Operation with room temperature sensing, Cycle operation
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EN2H-0221GE51 R0808 specifications

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