Honeywell EN2H-0221GE51 R0808 User Manual

SDC / DHC 

Operation 

EN2H-0221GE51 R0808 

79 

During reduced operation, you can select between two operating 
modes. 

 

ECO 

 

ECO, RED  

 

The heating circuit pump of the direct heating circuit continues 
functioning during reduced operation (see 5.2.3.2 Time program, 
pg. 73). The flow temperature is determined based on the lowered 
room temperature from the associated reduced heating curve. 
The set maximum temperature is not undershot. 

 

Building with minimal insulation values and high cooling loss. 

During reduced operation, the direct heating circuit is switched off 
completely with outside temperatures above the set frost-
protection limit. The maximum heat generator temperature is not 
functional. The heating circuit pump is switched off after a delay to 
avoid safety deactivation by reheating the heat generator (pump 
follow-up). 

If the outside temperature is or becomes lower than the specified 
outside temperature frost-protection limit, the controller switches 
from deactivated (deactivation mode) to lowered lowering 
operation and controls the heating circuit temperature based on 
the set lowering curve taking the set minimum heat generator 
specification into account. 

 

Building with high insulation values (full heating protection). 

 

The mode set here also applies for the ABSENT and RED. 
HEATING operating modes.