Solar Panel Frost Protection

The collector pump runs continuously, if the collector temperature is < SOLP-04.

The variable speed pump runs with minimum speed (PMP-04).

When the solar panel plant is filled with glycol, no setting change is necessary, since for SOLP-04 = -55 °C this function is disabled.

This function has to be enabled when a solar collector is filled with water. In this case SOLP-04 shall be set to a value greater or equal to 4 °C.

If the collector temperature gets higher than SOLP-04 + 5 K, the collector pump switches of after a delay of 10 minutes.

Table 13.   Parameter List

Description

Value Range

Default Value

Unit

SOLP-04: solar panel freeze protection

-55…20

4

°C

PMP-04: minimum pump speed

0…100

30

%