Technische Alternative FRISTAR3-WP, Operating Manual

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11
Connection of a circulation line
Activating the DHW circulation pump using the FRISTAR3-WP controller
Hydraulic circuit diagram with circulation line
Circulation pump (optional)
If an external DHW circulation pump is connected directly to the FRISTAR3-WP controller, it will op -
erate in pulse mode. While water is being tapped, the circulation pump runs provided the temperature
set at sensor T
Zirku
lies below the set temperature by the difference set with the potentiometer. Once
the pump stops, it can start up again only after a pause of 10 minutes.
If a DHW circulation pump is not used, the potentiometer must be set to 0 (= factory setting), as oth
-
erwise the primary pump would run on after every draw-off.
To connect the circulation line, a tee is installed in the secondary circuit cold water pipe.
Activating the DHW circulation pump using a different
switching device
It must be ensured that the flow rate in the DHW circulation line is greater than the flow sensor min -
imum flow rate (2 l/min or 120 l/h).
When the DHW circulation pump is switched on, the V
KW
sensor measures the flow rate and the pri -
mary pump is enabled.
Primary pump
Circulation pump