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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
8 Main controller and primary controller
05.02.2007
A heat demand transformer converts the last 3 types of signal into a flow temperature
setpoint.
In addition, an analog input and up to 3 digital inputs as heat request inputs can be
configured on the main controller and on the primary controller. These are always
available at the main controller, even if no main controller plant element has been
configured. The inputs then act on the boiler and on the heat demand outputs.
Main menu > Commissioning > Extra configuration > Main controller > Inputs
Main menu > Commissioning > Extra configuration > Primary controller > Inputs
Operating line
Range
Heat request modulating
Heating curve request 2-pos
DHW request 2-pos
Frost prot request 2-pos
From all request signals received, the “Max” block generates the maximum value. This
maximum value represents the flow temperature setpoint for the primary controller. The
setpoint will be raised by the amount of the setpoint increase and forwarded to a heat
source or another primary controller as “Heat demand from precontrol”.
8.5.1
Heat request modulating
Using a DC 0…10 V signal, a heat request for the main controller or primary controller
can be preselected.
The analog input can be matched to the DC 0…10 V signal source:
Main menu > Commissioning > Settings > …
or
Main menu > Settings > Main controller > Heat request
Main menu > Settings > Primary controller > Heat request
Operating line
Range
Factory setting
[Modulating] setpoint at 0 V
–150…50 °C
0° C
[Modulating] setpoint at 10 V
50…500 °C
100 °C
[Modulating] limit value
0…140 °C
10 °C
DC 0...10 V
0
2
4
6
8
10
-20
0
20
40
60
80
100
120
°C
2
3
313
1D
14
c
Value in °C at DC 0 V
d
Value in °C at DC 10 V
e
Limit value for heat demand (temperatures < limit value = no heat demand)
The DC 0…10 V input signal shall correspond to a flow temperature setpoint range of
20…120 °C. Below DC 0.5 V, the controller shall shut down.
The following parameters are to be set:
Setpoint at DC 0 V:
20 °C
Setpoint at DC 10 V:
120 °C
Limit value:
25 °C
Extra configuration
Example:
