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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 7 Boiler control 23.04.2009
T
3132S69
Y1 Y2 3
4
BuSt1
VlvShOff
If the shutoff valve and the boiler pump are controlled by separate outputs, both boiler
pump and burner are switched on only when the shutoff valve is fully open.
If there is a checkback signal from the shutoff valve, it must be configured to input
“Checkb signal shutoff valve”.
If a checkback signal from the shutoff valve is configured and there is no such check-
back signal on completion of the adjusted switch-on delay time, a fault status message
is generated. This fault leads to a boiler fault.
For more detailed information, refer to section 7.13 “Boiler faults”.
As a variant, it is also possible to only work with the switch-on delay. After control of the
shutoff valve, the switch-on delay must elapse for the pump or burner to switch on.
If the boiler pump is installed in the bypass, there is no need to wait for switching on
until the shutoff valve is open. In that case, the pump’s switch-on delay can be set to 0.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler … > Operation settings
Operating line Range Factory setting
Switch-on delay pump 0…255 s 0 s
Switch-on delay burner 0…255 s 0 s
Shutoff valve (MBRT) Open / Closed Open
If both the pump’s switch-on delay and the burner’s switch-on delay are parameterized,
first the pump is activated on completion of the pump’s switch-on delay; then, on com-
pletion of the burner’s switch-on delay, the burner is released.
Any adjusted overrun time (Settings > Boiler … > Limitations > Fan overrun time) acts on the
boiler pump and the shutoff valve.
Normally, the shutoff valve is fully open when the relevant boiler is released. If boiler
protection function “Maintained boiler return temperature” is used, in which case the
boiler is always maintained at the minimum temperature, the behavior of the shutoff
valve can be parameterized.
When using the “Open“ setting for the shutoff valve (maintained boiler return tempera-
ture), the shutoff valve is always opened, even if there is no heat request.
Depending on the type of hydraulic system used, this may not be required (e.g. mixing
pump).
Configuration of a terminal pair for a 3-position mixing valve. The terminals still avail-
able for selection are the free terminal pairs (Q1/Q2, Q3/Q4, Q5/Q6) for the open and
the close signal. In general, special terminal pairs must be used for that purpose (RC
units for radio interference suppression; for more detailed information, refer to subsec-
tion 3.3.2 “Terminal assignment and properties of outputs”) .
DC 0…10 V output for a DC 0…10 V mixing valve actuator.
For more detailed information, also refer to section 7.10 “Minimum limitation of the
return temperature”.
Control of shutoff
valve
Maintained boiler
return temperature,
3-position
Maintained boiler return
temperature, modulating
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