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9.5.36 Cooling function
Menu: Expert menu > Settings > Cooling function
The cooling function minimises the solar heating system stagnation periods. The solar heating system
is run at a high temperature to maximise piping heat loss.
If the cylinder temperature is 9 K below the cylinder maximum temperature (in systems with two heat
consumers always that of the low-priority cylinder) the solar pump is switched off.
If the collector temperature is 10 K below collector maximum temperature, the solar pump starts up
and runs until the collector has cooled down by 10 K. The solar pump then switches off and the
collector heats up again.
When the cylinder maximum temperature is reached, the solar pump switches off and the cooling
function is stopped.
The cooling function can not be activated if the evacuated tube collector option is active
or a configuration diagram including a swimming pool has been selected.
Systems with a domestic hot water cylinder that is charged by an external heat
exchanger: in "hard water" areas, increased levels of limescale formation can occur in
the heat exchanger secondary system.
Setting range
Off, On
Default setting
Off
6 720 644 593 (2010/04)
EXPERT MENU (FOR QUALIFIED TECHNICIANS ONLY)
New setting
75
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