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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 9 Precontrol 23.04.2009
The heat requests can be received from other devices via bus. In addition, there are 3
binary inputs and 1 analog input for signalling heat requests.
9.3 Types of primary controller
If only a pump or twin pump is configured, the primary controller consists of system
pump control. If, in addition, a mixing valve is configured, the primary controller consists
of mixing circuit control plus pump or twin pump control.
Y1
B1
M1
B7
3133S76
B1*
M1
3133S78
B7*
Primary controller type 1:
With mixing valve
Primary controller type 2:
With system pump
B1 Flow temperature sensor (* = optional, for display only)
B7 Return temperature sensor (* = optional, for display only)
M1 System pump (can be a twin pump)
Y1 Mixing valve
Primary controller type 1 with mixing circuit can provide optional maximum limitation of
the return temperature while primary controller type 2 only controls a system pump
depending on demand.
The flow or return temperature sensor of primary controller type 2 can be used for
display purposes.
By configuring the outputs, it is defined whether a primary controller type 1 or type 2 is
used. Without configuration of a mixing valve, type 2 is automatically used. It is also
possible to define a flow temperature boost with the type 2 controller to compensate for
temperature losses in the case of long pipes.
9.3.1 Control of mixing valve
For control of the mixing valve, a 3-position or DC 0…10 V actuator can be used. The
selection is made by configuring the relevant output.
9.3.2 Pump control
Pump control offers a number of monitoring choices, no matter if it is a single or twin
pump.
For more detailed information about pump control and twin pumps, refer to section 5.8
“Pump control”.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Primary controller > Fault settings > Overload pump
Operating line Range Factory setting
Fault acknowledgement None / Acknowledge /
Acknowledge and reset
Acknowledge
Fault acknowledgement B None / Acknowledge /
Acknowledge and reset
Acknowledge
Heat requests
Fault setting
primary controller
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