Dealing with malfunctions
FIGHTER 1120
62
Ifthe operating disturbance cannot be rectified by means of the above,
an installation engineer should be called.
Close the shut-off valves in heating medium system.
Now open the drain valve (76). A small amount of
water runs out, however, to fully empty the heating
medium side requires the connector that joins the
heating medium side and the connection on the heat
pump “VB-flow” to be loosened a little to allow air to
enter so the remaining water can run out. When the
heating medium is empty the requisite service can be
carried out.
When replacing the brine pump or drive side or when
cleaning the pump, the shut-off valves in the collector
system should be closed. The hose between the top
of the evaporator and the brine pump is loosened on
the evaporator. The loose hose end can now be bent
down and emptied in a small bowl. Now loosen the
connection on “Brine-in” a little to allow air to enter so
the heat pump's collector side is emptied completely.
When the circuit is empty the requisite service can be
carried out.
Draining, collector sideDraining, heat medium side
■ Shut down FIGHTER 1120 by turning the switch
(8) to “0”.
■ Open the service cover.
■ Loosen the venting screw with a screwdriver. Hold
a cloth around the screwdriver blade as a certain
amount of water may run out.
■ Insert a screwdriver and turn the pump rotor.
■ Screw in the venting screw.
■ Start FIGHTER 1120 and check whether the circu-
lation pump runs.
It is usually easier to start the circulation pump with
FIGHTER 1120 running, switch (8) set to “1”. If help-
ing the circulation pump to start is performed with
FIGHTER 1120 running, be prepared for the screw-
driver to jerk when the pump starts.
Helping the circulation pump to start
NOTE!
The product's serial number
should always be stated with all
correspondence with NIBE.
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