Reduced Operation - Honeywell SDC Service Manual

SDC / DHC
5.2.5.1
Factory setting
Setting range
Set values
Application
Application
NOTE
EN2H-0221GE51 R0812

Reduced operation

During reduced operation, you can select between two operating
modes.
ECO
ECO, RED
RED (lowering operation)
The heating circuit pump of the direct heating circuit continues
functioning during reduced operation (see 5.2.3.2 Time program,
pg. 72). 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.
ECO (switch-off operation)
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.
Operation
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