Heating System - Honeywell SDC Operating Instructions Manual

Operation
IMPORTANT NOTE!

4.2.5.2 Heating System

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temperature. The temperature will not fall below the set
low limit.
Application:
ECO (Switch-off Mode)
During reduced mode, the direct heating circuit is
completely switched off in case of outside temperatures
exceeding the set frost protection limit. The heat
generator minimum temperature limit is deactivated. The
heating circuit pump is switched off with a short delay in
order to avoid a safety switch-off owing to heat
accumulation in the heat generator (pump extended
running time).
If the outside temperature falls below the specified frost
protection limit, the controller switches from switch-off
mode (ECO) to reduced mode (ABS) and the heating
circuit temperature is adjusted according to the set
reduced setpoint considering the low limit of the heat
generator.
Application:
The mode set here applies also for the operating modes:
ABSENCE and CONSTANT REDUCED operating
modes.
Function This parameter refers to the type of heating system
(floor-, radiator-, or convector heating) and can be
compared to the exponent of the relevant heat
exchanger. The setting determines the curvature of the
heating characteristic of the unmixed circuit and
compensates the performance losses at low
temperatures by means of its progressive characteristic.
Depending on the type of heating system, the following
settings are recommended:
Buildings with low insulation values
and high heating losses.
Buildings with high insulation values
41
SDC / DHC 43
EN2H-0220 GE51 R1005