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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 7 Boiler control 23.04.2009
Main menu > Commissioning > Settings > … or
Main menu > Settings > Inputs
Operating line Range Factory setting
Normal position Open / Closed Open
For more detailed information, refer to section 5.8 “Pump control”
7.14 Burner hours run counter and output
balance
For stage 1 or the basic stage, a checkback signal can be configured.
This checkback signal can be used for the burner hours run counter, the burner start
counter, and for calculating the output balance.
When there is no checkback signal, the burner hours run counter is started by the
output relay of stage 1. When burner stage 2 or modulation is released, the number of
operating hours of stage 2 or modulation are counted.
Main menu > Commissioning > Extra configuration > Boiler … > Inputs
Operating line Adjustable values / remarks
Checkb signal burner Assign input
Current burner output Assign input (for modulating burners)
With modulating burners, the current position of the air damper can be fed back via
potentiometer (0…1000 ) or DC 0…10 V signal. This checkback signal is also used
for computing the output balance. If there is no checkback signal, the positioning model
is used.
To produce an output balance, the boiler sequence manager requires the current
output of each boiler.
Based on the set rated capacity and the output proportion of stage 1, the boiler com-
putes the current output as a function of the cycling ratio of stage 1 or stage 2, or
depending on the degree of modulation of the modulating burner.
When setting the rated capacity, the boiler’s efficiency can be taken into consideration.
But this is of importance only if the boilers contained in the boiler sequence have
different efficiencies. Apart from that, the proportions of the individual boiler outputs are
of importance.
Main menu
> Commissioning > Settings > … or
Main menu > Settings > Boiler … > Burner
Operating line Range Factory setting
Boiler output 1…10000 100 kW
Proportion stage 1 0…100% 60%
With 1-stage burners, 100% is automatically used.
In the case of a 2-stage burner, the proportion of stage 2 is the difference between
100% and the proportion of stage 1.
The number of burner hours run and the number of burner starts are shown at menu
item Inputs/setpoints. On the user level, they can only be read; on the service level, they
can also be adjusted. It is thus possible to set the effective values.
Main menu > Commissioning > Settings > … or
Main menu > Boiler … > Inputs/setpoints
Operating line Range Factory setting
Hours run stage 1 0…99999 h 0 h
Hours run stage 2 0…99999 h 0 h
Burner start counter 0…99999 0
Fault supervision
boiler pump
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