Siemens Synco 700 - Limit and Protective Functions; Frost Protection; Limitations

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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 8 Main controller and primary controller 05.02.2007
Main menu > Commissioning > Settings > …
Main menu > Settings > Primary controller > Primary controller
Operating line Range Factory setting
Setpoint increase 0…50 K 10 K
8.8 Limit and protective functions
8.8.1 Frost protection
Here, the setting is made whether or not “Frost protection for the plant” shall act on the
pump for precontrol.
For more detailed information about frost protection for the plant, refer to section
5.4
“
Pump overrun and mixing valve overrun”.
“Frost protection for the plant“ is only available if an outside sensor is present (local
sensor or via Konnex bus).
The function can be deactivated.
The flow temperature is monitored to ensure it will not drop below a minimum level.
Should it fall below 5 °C, a heat demand signal is sent to the heat source and the
mixing valve will open.
The function will be ended as soon as the flow temperature has risen to 7 °C. It is
active for a minimum of 5 minutes.
8.8.2 Limitations
This setting is used to ensure maximum limitation of the flow temperature setpoint.
This setting is used to ensure minimum limitation of the flow temperature setpoint.
Minimum limitation is only active when there is a demand for heat.
The function can be deactivated by using setting “----“.
This function is only available with primary controller type 1. The rate of increase of the
flow temperature setpoint can be limited to a maximum (heating up brake). In that case,
the maximum possible increase of the flow temperature setpoint is the selected rate of
temperature increase per unit of time (K/h).
Limitation of the rate of flow temperature increase effects the following:
• Prevention of cracking noises in the pipework
• Prevention of excessive loads on heat generating equipment
The function can be deactivated by using setting “----“.
ΔTFlSetpt
t
t
3133D01
TFlSetpt
TFlSetpt
Maximum increase =
Δt
t
Time
Δt Unit of time
TFlSetpt Flow temperature setpoint
ΔTFlSetpt Rate of setpoint increase per unit of time
Primary controller
Frost protection for
the plant
Frost protection for
the flow
Maximum limitation of
the flow temperature
Minimum limitation of
the flow temperature
Limitation of the rate of
flow temperature in-
crease