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Siemens Building Technologies Basic Documentation RVA47.320 CE1P2379E
HVAC Products Description of the OEM settings 15.07.2002
5.9 Frost protection for the plant
• Protects the plant against freezing
When this function is activated and there is a risk of frost, the heating will automatically
switch on, thus preventing the heating plant from freezing.
This function is ensured only if the plant works properly and is fully operational!
1. Press the line selection buttons to select line 33OEM.
2. Press the + / - buttons to activate or deactivate the frost protection for the plant.
Setting range Unit Factory setting
0 / 1 - 1
Depending on the selection made, 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
The heating circuit pump will be switched on in 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 this temperature range, it is decisive
which situation prevailed:
− 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 activated also in the range up to -4 °C and is switched on / off when
the outside temperature is higher
-2
2371Z30
TA °C
OFF
01234-3-4-5-6 -1
takt
ON
Benefit
Description
Important
Setting
Effect
frost protection for the
plant
Exception
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