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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 9 Precontrol 23.04.2009
9.4 Plant operation
Plant operation indicates whether the primary controller is switched on and whether the
pump runs.
Main menu > Primary controller > Plant operation
Operating line Range Factory setting
Preselection
Auto / Off* Auto
State Off / On
Cause Commissioning /
Request /
Frost protection for consumer /
Frost protection for the flow /
Frost protection for the plant /
Overtemp protection / overrun /
Plant operation selector /
No request
* Frost protection functions are ensured
For service purposes, the primary controller can be switched off. In that case, the valve
is closed and the pump switched off, or valve and pump start their overrun.
The heat demand is not passed on when in the “Off” position!
When preselecting “Off”, the internal frost protection function remains active and frost
protection-related heat requests (frost protection for the flow) from externally is ac-
cepted and handled.
When service work is completed, the selector must be set back to “Auto”.
The display shows the primary controller’s current state (On / Off).
It is indicated why the current state is active.
9.5 Heat demand and heat request
Function block “Primary controller” collects the heat demand signals from all heat
consumers. These are:
• Heating circuits
• DHW heating
• Other primary controllers
• Heat demand signals from individual room controllers for radiators
Plant operation
Preselection (plant opera-
tion selector)
⇒
State
Cause
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