Minimum Limitation Of The Return Temperature; Frost Functions And General Protective Functions - Siemens Synco 700 Basic Documentation

Frost protection for the
plant
Frost protection for
the flow
Maximum limitation of
the flow temperature
Minimum limitation of
the flow temperature
Heating up brake
Building Technologies
HVAC Products
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Heating circuit 1 ( or 2 or 3) > Mixing circuit controller
Operating line
[Tn] return temp limitation max
9.8.3

Minimum limitation of the return temperature

Using the boiler return temperature sensor, it is possible to implement a common
minimum limitation of the return temperature for all consumers (heating circuits and
DHW heating) with no need for configuring a boiler. If the boiler return temperature
drops below the adjusted minimum limit value, the amount of heat drawn by the con-
sumers will be restricted by locking signals.
For more detailed information about the configuration, refer to subsection 6.6.2
"Minimum limitation of the boiler temperature".
For information about the parameterization of this function, refer to subsection 6.6.1
"Maintained boiler return temperature".
9.8.4

Frost functions and general protective functions

It can be selected whether or not frost protection for the plant shall act on the heating
circuit pump.
The flow temperature is monitored for minimum limitation. If the flow temperature falls
below 5 °C, a heat demand signal is sent to the heat source and the mixing valve will
open. The function will be stopped as soon as the flow temperature has risen to 7 °C.
The function is active for a minimum of 5 minutes.
This setting ensures maximum limitation of the flow temperature setpoint.
This setting ensures minimum limitation of the flow temperature setpoint. Minimum
limitation is only active when there is a demand for heat.
Setting "- - - " (none) deactivates the function.
The rate of increase of the flow temperature setpoint can be limited to a maximum
(called "heating up brake"). In that case, the maximum the flow temperature setpoint
can increase is only the selected temperature per unit of time (K per hour). This func-
tion prevents knocking noises in the pipework and excessive loads on the heat source.
Setting "- - - " deactivates the function.
Modular Heating Controller RMH760B
9 Heating circuit control
Range
0...60 min
Factory setting
30 min
137/238
CE1P3133en
05.02.2007