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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 6 Boiler sequence management 23.04.2009
This approach can be chosen only if the output of the basic stage of boiler 2 exceeds
the rated capacity of boiler 1. If this strategy is chosen, a fixed boiler sequence makes
sense, thereby ensuring that the same boiler is always boiler no. 2.
Output stage
1 2 3 4 5
Boiler release
1.1 1.1+1.2 2.1 2.1+2.2 1.1+2.1+2.2
This switch-on order is called binary switching on. With the RMK770, binary switching
on is restricted to the first 2 boilers. The next boilers are switched sequentially. With
binary switching on, boiler 2 is always the controlling boiler.
Binary switching of boiler sequence with 2 boilers:
Output of boiler 1 = 100%, output of boiler 2 = 200%
0
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0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
3132D03
Heat demand or load
Boiler 1
Boiler 2
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler sequence manager > Control parameters
Operating line Range Factory setting
Boiler sequence strategy Sequentially / Binary-
sequentially
Sequentially
6.3.4 Boiler sequence operating mode
or Main menu > Boiler sequence manager > Boiler sequence optg mode
Operating line Range Factory setting
Preselection
Off / Summer operation / Auto
Auto
State
On / Off
Cause Commissioning
Operating mode selector
Frost protection for consumer /
Flow/return frost protection /
Sustained mode
Overtemp protection / Overrun /
Protective boiler startup seq
Flue gas measuring mode
Manual control
No boiler sensor available /
No request / Request
Summer operation
Inactive / Active
Boil sequence selection manual Auto / 1…6 Auto
or Main menu > Boiler sequence manager > Boiler sequence optg mode
Operating line Range Factory setting
Setp preselection manual
---- / 8…140 °C ---- °C
Example
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