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Building Technologies
Boiler sequence controller RMK770
CE1P3132en
HVAC Products
9 Precontrol
23.04.2009
•
Heat demand signals from individual room controllers for air heating coils
•
Heat demand signals from primary air handling plant
A heat demand transformer converts the last 3 signals to a flow temperature setpoint.
In addition, 3 digital and/or 1 analog input can be configured on the controller as heat
request 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, the “Max” block (see illustration) generates the maximum
value. This maximum value is the flow temperature setpoint for the primary controller.
The setpoint is raised by the amount of the setpoint boost and send to a heat source or
another primary controller as “Heat demand of precontrol”.
9.5.1
Heat request modulating
A heat request can be preselected with a DC 0…10 V signal.
The signal can be matched to the DC 0…10 V signal source.
Main menu > Commissioning > Settings >
… or
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 °
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
31
31
D1
4
c
Value in °C at DC 0 V
d
Value in °C at DC 10 V
e
Limit value for heat demand (temperatures below this level are interpreted as “no heat demand”)
The DC 0…10 V input signal shall correspond to a flow temperature setpoint range of
20…120 °C. The following parameter settings are required:
[Matching] setpoint at 0 V: 20 °C
[Matching] setpoint at 10 V: 120 °C
Extra configuration
Example:
