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9.5.25 External heat exchanger anti-icing system
Menu: Expert menu > Settings > D: Ext. heat exchanger > Anti-icing
The anti-icing function is intended for solar heating systems which have long pipe lengths in areas
exposed to frost and transfer solar heat via an external heat exchanger.
If the flow temperature of the external heat exchanger drops below 10 °C, a bypass valve diverts the
heat transfer fluid to bypass the heat exchanger. The heat transfer fluid is directed into the collector
and is heated further. Upwards of a flow temperature of 15 °C, the solar system is connected through
to the heat exchanger again.
Fit the bypass valve so that the fluid flow is directed through the external heat exchanger when the
valve is de-energised and bypasses the heat exchanger when the valve is energised.
WARNING: risk of frost damage to heat exchanger!
B Fit valve with a positioner that achieves a switching time of less than 45 seconds.
Setting range
Off, On
9.5.26 Cylinder top temperature limiter
Menu: Expert menu > Settings > D: Ext. heat exchanger > Temperature limiter top cylinder
The purpose of the temperature limiter is to prevent the cylinder connected to the external heat
exchanger being heated to over 95 °C.
WARNING: risk of personal injury and damage to the system by temperatures over 95 °C
in the top part of the cylinder.
If this function is deactivated, vapour pressure pulses can be produced.
Setting range
On, Off
Default setting
Off
Default setting
on
6 720 644 593 (2010/04)
EXPERT MENU (FOR QUALIFIED TECHNICIANS ONLY)
New setting
New setting
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