Honeywell SDC Benutzerhandbuch

Operation 

SDC / DHC  

58 EN2H-0220GE51 

R0308 

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. 

 

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This parameter refers to the type of the heating system (floor, 
radiator or convector heating) and can be matched to the 
exponent of the respective heat distributor. Using its progressive 
characteristics, the set value determines the curve characteristics 
of the heating curve of the direct heating circuit and compensates 
for the losses in output in the low-temperature range with it. 

The following settings are recommend depending on the type of 
heating system: 

1,1 

Slightly progressive heating curves for floor or other 
area heating. 

1,3 

Progressive standard heating curves for all radiator 
heating with m-values between 1.25 and 1.35. 

2 

Progressive heating curves for convector and 
baseboard heating. 

>3 

Heavily progressive heating curves for general ventilator 
applications with high starting temperatures.