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Page 27 of 40
Frost protection
A number of functions are built into the system to prevent frost damage. These functions are al-
ways active regardless of the operating modes and settings selected (including OFF). Any missing
or defective temperature sensors or system components can of course render this protection inef-
fective:
-
When the outside temperature falls below 2 °
C
, the central heating circulation pump will
start. With that, any spaces under the eaves and any attic space are secured and you can
also monitor water temperature.
-
If the central heating or room sensors fall below 2 °
C
, all circulation pumps will start, along
with the heat pump and auxiliary heating, and temperatures will, if possible, be raised to
5°
C
.
Pre-heating sanitary hot water
When there is a requirement of heating the sanitary water the three- way valve position
is
changed
and the supply water will be feed from the compressor condenser and supply system through the
hot-water tank. In this situation the water is not circulated through the central heating system.
Prioritising between the sanitary water and central heating is always done like this so the sanitary
water has to be met before domestic heating can be produced.
There are two set points for the sanitary waters temperature. One for the wanted water tempera-
ture to activate the compressor heating, and in addition one minimum temperature, where the
supplementary heating becomes active. At this mode of operation it is obtained that the heat pump
delivers energy as long as there is not drawn larger amounts of sanitary water from the tank.
