Minimum Burner Runtime; Switching: Multi-Stage Heat Generator/Switching Differential - Honeywell SDC heating and district heating controller Service Manual

SDC / DHC
See also
7.1.6
Function
NOTE
See also
7.1.7
Function
EN2H-0221GE51 R0808
burner switch-off or enabling in case of the interruption of the heat
generator sensor.
ATTENTION
Only Ag (hard silver), Au (gold) or Ni (nickel) are to be used
for the contacts.
In case of a sensor short-circuit a relevant fault message appears
and the burner is blocked.
Burner enabling in case of a faulty heat generator sensor
In case of a sensor short-circuit or interruption, a fault message
appears upon simultaneous unlimited enabling of the burner.
The control of the heat generator is carried out only manually by
means of the mechanical boiler temperature controller (boiler
thermostat) on the boiler panel according to the set value.
ATTENTION
Activation of this setting is only permissible if an
electromagnetic boiler temperature controller is connected in
series with the burner phase and the boiler temperature is
thus limited by this boiler temperature controller. Otherwise,
there is the danger of boiler overheating.
5.4.6 "Heat generator" menu (HEAT GENER., pg. 99

Minimum burner runtime

This function extends the burner runtimes and reduces the
standby losses. After starting the burner, a minimum of the set
time must elapse before the burner is deactivated again
(regardless of the temperature increase).
If the temperature in the heat generator exceeds the set heat
generator maximum temperature limit, the minimum burner run
time is stopped and the burner is switched off in advance.
5.4.6 "Heat generator" menu (HEAT GENER., pg. 99

Switching: Multi-stage heat generator/Switching differential

The control unit offers independently adjustable switching
differentials with reference to the same setpoint.
Hydraulic Components
131