Frost Protection For The Plant - Siemens RVA63.280 Basic Documentation

Benefit
Description
Important
Setting
Effect
Exception
146/184
Siemens Building Technologies
Landis & Staefa Division
3.15

Frost protection for the plant

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
0 / 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
3.15.1 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
...-4 °C
-5...1.5 °C
1.5 °C...
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
ON
-6 -5 -4 -3
Basic Dokumentation RVA63.280, RVA53.280
Unit
-
Pump
Continuously ON
ON for 10 minutes at 6-hour intervals
Continuously OFF
takt
-2 -1 0 1
Factory setting
1
Diagram
ON
takt
OFF
OFF
2 3 4
TA °C
CE1P2374E
19.04.2001