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Building Technologies
Boiler Sequence Controller RMK770
CE1P3132en
HVAC Products
5 General functions, fundamentals
01.03.2005
For 3-position control, the actuator’s current position is acquired by a stroke model. As
soon as the stroke model reaches 0 % or 100 % respectively, a synchronization signal
(continuous on pulse or continuous off pulse for 1.5 times the running time) is delivered
to the actuator, thus making certain it has reached the relevant position.
This synchronization pulse is repeated for 1 minute at 10-minute intervals.
If a position change is called for, the synchronization pulse will immediately be stopped.
5.8
Pump control and twin pumps
Every pump (main pump, boiler pump, system pump, heating circuit pump) can be
monitored with a flow switch.
Also, every pump can be a twin pump.
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d d
B
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2Z
22
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The decision whether a pump is installed as a single or twin pump is made in the extra
configuration
with the relevant function block
(boiler sequence, boiler, primary con-
troller, heating circuit).
Main menu > Commissioning > Extra configuration > Boiler sequence manager > Outputs
Main menu > Commissioning > Extra configuration > Boiler … > Outputs
Main menu > Commissioning > Extra configuration > Primary controller > Outputs
Main menu > Commissioning > Extra configuration > Heating circuit > Outputs
Operating line
Adjustable values / remarks
…pump
Assign terminal
…pump B
Assign terminal
When, in addition to the pump, pump B is configured, a single pump becomes a twin
pump.
For this second pump, there is also a fault input available. The flow switch is used by
both pumps.
Main menu > Commissioning > Extra configuration > Boiler sequence manager > Inputs
Main menu > Commissioning > Extra configuration > Boiler … > Inputs
Main menu > Commissioning > Extra configuration > Primary controller > Inputs
Main menu > Commissioning > Extra configuration > Heating circuit > Inputs
Operating line
Adjustable values / remarks
[…pump] overload
Assign terminal
[…pump B] overload
Assign terminal
Flow signal pump
Assign terminal
If a twin pump was configured, the relevant function block will show menu item “Twin
pump”.
Synchronization
pulse
Setting
Setting