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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 7 Heat demand and heat requests 05.02.2007
To ensure that minimum opening travel of the valve will not generate a demand for
heat, a switch-on or switch-off threshold can be defined. The factory settings are as
follows:
• A demand for heat will be calculated only when the valve positions are >10 %
• When the valve positions of all consumers are <5 %, the demand for heat will be
suppressed again
Main menu > Commissioning > Settings > … or
Main menu > Settings > Primary controller > Demand control
Main menu > Settings > Main controller > Demand control
Main menu > Settings > Boiler > Demand control
Operating line Range Factory setting
[Curvepoint 1] outside temp –50…50 °C –10 °C
[Curvepoint 1] flow temp 0…140 °C 70 °C
[Curvepoint 2] outside temp –50…50 °C 20 °C
[Curvepoint 2] flow temp 0…140 °C 70 °C
Flow temp correction max 0…100 K 10 K
Control mode Slow / Medium / Fast Medium
Request evaluation Maximum / Average Maximum
Limit value request on
Off value…100 %
10 %
Limit value request off
0…On value %
5 %
3131D20
1
2
Outside
temperature
Flow temperature
(Curvepoint 1):
Outside temp.
Max. flow temp.
readjustment
(Curvepoint 1):
Flow temp.
(Curvepoint 2):
Flow temp.
(Curvepoint 2):
Outside temp.
Adaptation of the flow temperature can be set as follows:
• The rate of change of flow temperature readjustment can be set under > Demand
control > Control action
• The kind of evaluation of the consumers’ valve positions can be selected under
> Demand control > Request evaluation
− When using the Maximum setting, the flow temperature will be readjusted in a
way that the valve position of the consumer with the greatest heat demand is 90
%
− When using the Average setting, the flow temperature will be readjusted in a way
that the valve positions of the 4 largest consumers will be 90 % on average
This setting does not ensure that the heat demand of all consumers can be satis-
fied. It makes certain, however, that an individual consumer cannot force the flow
temperature to high levels (e.g. because a window was left open).
The heating curve settings of the heat demand transformers also apply to the heat
demand contact of the heating curve (operating line
Heating curve request 2-pos).
daptation of the flow
temperature
Note
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