Benchmark MAIN Installation & Service Instructions Manual page 43

Pump Wiring
Cover
Socket Headed
Screw
Pump Setting
Fig. 69
Pump Wiring
Cover
© Baxi Heating UK Ltd 2007
Pump Body
Pump Head
Fig. 68
Automatic Air
Vent
Fig. 70
14.0 Changing Components
14.12 Pump - Head Only (Fig. 68)
1. Drain the primary circuit and remove the socket head
screws securing the pump head to the body and draw the
head away.
2. Undo the screw on the pump wiring cover and remove
the cover. Using a suitable flat bladed screw driver press
the cable securing levers downwards to release each wire
after noting their position.
3. A standard replacement Grundfos 15-60 head can now
be fitted. Connect the pump wiring to the new head. The
pump speed must be set to 3 (Fig. 69).
4. Reassemble in reverse order.
14.13 Pump - Complete (Fig. 70)
1. Drain the primary circuit and unscrew the automatic air
vent from the pump body. Undo the two screws securing
the body to the pipe and manifold and draw the pump
forwards.
2. Undo the screw on the pump wiring cover and remove
the cover. Using a suitable flat bladed screw driver press
the cable securing levers downwards to release each wire
after noting their position.
3. Connect the wiring to the new pump. Examine the 'O'
ring seals on the return pipe and manifold, replacing if
necessary.
4. Fit the air vent to the pump body and reassemble in
reverse order.
14.14 Automatic Air Vent (Fig. 70)
1. Drain the primary circuit and unscrew the automatic air
vent from the pump body.
2. Examine the 'O' ring seal, replacing if necessary, and fit it
to the new automatic air vent.
3. Reassemble in reverse order.
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