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Siemens Building Technologies
Basic Documentation RVA63.242, RVA53.242
CE1P2373E
Landis & Staefa Division
Description of OEM settings
26.03.2001
5.25 Frost protection for the plant (HK1 and HK2)
The plant is protected against freeze-ups.
When the function is activated, the heating will automatically be switched on if there is a
risk of frost, thus preventing freeze-ups.
Prerequisite for this function is that the plant operates properly!
Setting range
Unit
Factory setting
0 / 1
–
1
The plant will be protected by activating the pumps.
Entry:
0
Frost protection for the plant
OFF
Function deactivated
1
Frost protection for the plant
ON
Function activated
5.25.1 Frost protection for the plant
The heating circuit pump will be switched on as a function of the actual
outside
temperature,
even if there is no demand for heat.
Outside temperature
Pump
Diagram
...-4 °C
Continuously ON
ON
-5...1.5 °C
ON for 10 minutes at 6-hour intervals
takt
1.5 °C...
Continuously OFF
OFF
Between -4...-5 °C, different statuses can occur. In that range, it is important which
situation had existed before:
If the temperature was previously higher (in the range of "takt“), the pump is switched
on / off also in the range -4 to -5 °C and is continuously running only when the outside
temperature is lower
If the temperature was previously lower (in the range of "ON“), the pump is continuously
running also in the range up to -4 °C and is switched on / off only when the outside
temperature is higher
-2
2371Z30
TA °C
OFF
0
1
2
3
4
-3
-4
-5
-6
-1
takt
ON
Benefit
Description
Important
Setting
Effect
Exception