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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 6 Boiler sequence management 23.04.2009
To make certain that changeover to another lead boiler does not take place at an
awkward point in time (e.g. on a weekend), the time of changeover (weekday, time of
day) can be set.
On completion of the period of time set (see settings above), the next boiler is selected
as the lead boiler.
It may be desirable to always use the same boiler as the lead boiler and to only have
the other boilers change their sequence (e.g. 1 boiler sequence with 1 modulating
burner and several multistage burners).
In that case, one of the boilers can be defined as the fixed lead boiler.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler sequence manager > Control parameters
Operating line Range Factory setting
Lead boiler fixed ---- / 1…6 ----
The boiler defined in this way only remains the fixed lead boiler when using automatic
boiler changeover.
It is also conceivable to select a boiler as a backup boiler, e.g. an old boiler which no
longer meets environmental requirements and which, therefore, may only be used to a
limited extent.
If a boiler is defined as a backup boiler, that boiler is always the last to be switched on.
Several boilers can be defined as backup boilers. These are then switched on in as-
cending order.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler … > Operation settings
Operating line Range Factory setting
Backup boiler Yes / No No
The “Backup boiler” setting also applies to operating mode “Boiler sequence selection
manual”.
A boiler can be released or locked via binary input or in the “Boiler operating mode”
setting.
Main menu > Boiler … > Boiler operating mode
Operating line Range Factory setting
Preselection Auto / Off Auto
In the case of “Off“ via binary input, it is also possible to select whether this “Off” is uncon-
ditional or if, in the event of frost, it can be overridden.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler … > Limitations
Operating line Range Factory setting
Frost prot (release input off) Off / On On
With “Off” via digital input = Off, the boiler is not put into operation, even if there is risk
of frost. With the “On” setting, the boiler can be put into operation by the boiler se-
quence manager if there is risk of frost.
Fixed lead boiler
Note
Backup boiler
Note
Boiler release
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