440/617
Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.23.22 Frost protection for the plant
Line no. Operating line
6120 Frost protection plant
Off
On
The controller activates all released plant pumps, depending on the current outside
temperature, thus protecting the heating installation against freeze-ups. In this case, the
heat sources are not put into operation.
Warning!
Prerequisite for proper functioning is a fully operational plant. Frost protection
for the plant necessitates an outside sensor. If that sensor is not available, the
function is ensured by simulating an outside temperature of 0 °C and by
delivering an error message.
Outside temperature Pump Diagram
...-4 °C Continuously On ON
-5...1.5 °C On for 10 minutes at 6 hours intervals Cycle (Takt)
1.5 °C... Continuously Off OFF
7471z114e/0209
Figure 97: Frost protection for the plant
Note!
Different states can occur between -4 and -5 °C. Within this temperature range, the
previous situation is decisive:
If the temperature was higher (in the range of Takt), the pump also cycles in the
temperature range from -4 to -5 °C, and is continuously.
If the temperature was previously lower (in the range of ON), the pump is
continuously running in the range up to -4 °C also and cycles only when the outside
temperature is higher.
Off
Function is deactivated.
On
Function is activated.
If the modulating boiler pump or the modulating heating circuit pump only runs because
frost protection for the plant is active, pump control ensures operation at the
parameterized minimum speed.
Frost protection plant
Minimum pump speed
during frost protection
for the plant
To Next Page
Loading...
Need help?
General
