Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 7 Heat demand and heat requests 2017-09-29
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
satisfied. 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).
The "On range" and the "Off range" depend on the settings made:
60
OFF
80 90
100
50
40
30
20 70
ON
[%]
3133D12
10
0
Limit value request on
Limit value request off
OFF…100
Setting range for limit value request On (example with OFF = 30 %)
0… ON
Setting range for limit value request Off (example with ON = 45 %)
Adaptation of the flow
temperature
Note
Setting the limit value
request