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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 17 Function block: Service functions and general settings 15.03.2011
17.4 Auxiliary functions
17.4.1 Frost protection for the plant
The plant can be protected against frost. Precondition is that controller and heat
source are ready to operate (mains voltage present!).
The following settings are required:
Outside temperature at which frost protection shall respond
Minimum flow temperature to be maintained by the frost protection function
T
A
2524D04
ON
OFF
0,5 °C
BZ 167
0,5 °C
BZ167
T
A
OFF
ON
Operating line 167
Outside temperature
Frost protection OFF
Frost protection ON
If the current outside temperature falls below the limit value (setting on operating
line 167 minus 0.5 °C), the controller switches heating circuit pump M2 on and
maintains the flow temperature at the setpoint selected for frost protection (operat-
ing line 168).
An appropriate heat request is sent to the heat source.
The control is switched off when the outside temperature exceeds the limit value
by 0.5 °C.
Frost protection for the plant can be deactivated (setting --.- on operating line 167).
75


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