Siemens Synco 700 Series - Page 137

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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 8 Heat demand and heat requests 23.04.2009
3131D20
1
2
Outside
temperature
Flow temperature
(Curve point 1):
Outside temp.
Max. flow temp.
readjustment
(Curve point 1):
Flow temp.
(Curve point 2):
Flow temp.
(Curve point 2):
Outside temp.
The adaptation of the flow temperature can be set as follows:
• The speed 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 is readjusted such that
the valve position of the consumer with the greatest heat demand is 90%.
− When using the “Average” setting, the flow temperature is readjusted such that
the valve positions of the 4 largest consumers will be 90% on average.
This setting does not ensure that the heat demand from all consumers can be sat-
isfied. But it prevents an individual consumer from forcing the flow temperature to
a high level (e.g. because a window was left open).
The heating curve settings of the heat demand transformers also apply to the heat
request contact of the heating curve (operating line Heating curve request 2-pos).
Both “On range“ and “Off range“ depend on the settings:
Limit value request on
Limit value request off
OFF…100 Setting range for limit value request On (e.g. OFF = 30%)
0…ON Setting range for limit value request Off (e.g. ON = 45%)
A
daptation of flow
temperature
Note
Setting the limit value
request