Technical data

13.0 Changing Components

Socket Headed

Screw

Pump Head

Pump Body

Automatic Air

Vent

Fig. 53

Fig. 54

Electrical Supply

Plug

Pump Flow

Pipe

13.10 Pump - Head Only (Fig. 53)

1. Disconnect the electrical supply plug from the pump.

2. Close the flow and return isolation taps and drain the

boiler primary circuit. Remove the socket head screws

securing the pump head to the body and draw the

head away.

3. Reassemble in reverse order.

13.11 Pump - Complete (Fig. 54)

1. Disconnect the electrical supply plug from the pump.

2. Close the flow and return isolation taps and drain the

boiler primary circuit. For ease of access remove the

heating pressure gauge (13.14).

3. Undo the three screws securing the body to the inlet

assembly and pump flow pipe. Draw the complete

pump forwards.

4. Pull off the securing clip and remove the automatic

air vent. Transfer them to the new pump body.

5. Examine the ‘O’ ring seals, replacing if necessary and

reassemble in reverse order.

13.12 Automatic Air Vent (Fig. 54)

1. For access on 12 - 28 models see Section 13.17 to

remove the expansion vessel. Close the flow and

return isolation taps and drain the primary circuit.

2. The automatic air vent is a bayonet fitting. Remove

by twisting anticlockwise.

3. Fit the new automatic air vent, ensuring the ‘O’ ring

is fitted and the cap is open . Reassemble in reverse

order.

Control Box removed

for clarity