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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 6 Boiler temperature control 05.02.2007
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler > Limitations
Operating line Range Factory setting
Protective boiler startup On / Off On
To prevent the boiler temperature from staying below that minimum level for unneces-
sary lengths of time, the amount of heat drawn by DHW heating and the heating circuits
can be restricted until the boiler temperature has again risen above the minimum limit
value. Protective boiler startup generates critical locking signals (for more detailed
information, refer to subsection
5.6.2 “Load control”).
In the case of plant with mixing valve for the maintained boiler temperature, protective
boiler startup is ensured by the mixing valve. In that case, locking signals for protective
boiler startup will not be generated.
It can be selected whether or not the boiler pump shall be switched off (pump off) when
protective boiler startup is active.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler > Limitations
Operating line Range Factory setting
Protective boiler startup Pump on / Pump off Pump on
Protective boiler startup can be interrupted by the controller in order to ensure frost
protection for the plant in the event of burner faults, for example.
In the case of protective boiler startup and simultaneous frost protection for the plant,
the boiler temperature gradient must turn positive within 15 minutes. Otherwise, the
locking signal will become invalid for at least 15 minutes. Protective boiler startup
becomes active after 15 minutes as soon as the boiler temperature gradient turns
positive.
6.6.9 Boiler shutdown
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler > Protective boiler startup
Operating line Range Factory setting
Boiler shutdown Without / Automatic /
Summer
Automatic
Here, it can be selected when minimum limitation of the boiler temperature shall be
active.
This setting ensures that the boiler is always maintained at the minimum boiler tem-
perature.
This setting ensures that the boiler is maintained at the minimum boiler temperature
when there is a heat request from one of the consumers. If there is no heat request, the
boiler temperature may drop below its minimum.
When using the
Summer setting, the boiler is not maintained at the minimum boiler
temperature only when the boiler has identified summer operation. The change to
summer operation takes place at midnight when, previously, the boiler has received no
heat request from the heating circuits for 48 hours. A heat request from DHW heating
will be accepted, however.
The boiler also identifies summer operation when it has received no valid boiler tem-
perature setpoint for more than 48 hours, or when the composite outside temperature
has exceeded the outside temperature limit value.
Boiler pump
Protective boiler startup
and frost protection for the
plant
Without boiler shutdown
utomatic boiler shut-
down
Summer
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