Potterton HE Plus Installation & Service Instructions Manual page 38

Venturi
Gas Inlet Pipe
Fig. 70
Collector
Fig. 69
38
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Supplied By www.heating spares.co Tel. 0161 620 6677
Injector
Cover
Venturi
Injector
Fig. 71
When fitting the venturi
ensure that the arrow is
pointing forward
14.0 Changing Components
14.3
1. Undo the nut on the gas inlet pipe to the venturi (Fig. 70)
and pull the sensing pipe off the fan.
2. Disconnect the electrode leads, noting their position and
disconnect the fan electrical plugs.
3. Undo the screws securing the collector to the extension
piece.
4. Remove the collector and fan assembly, being careful to
retain the injector in the venturi.
5. Undo the screws securing the fan to the venturi and fit the
new fan. On 18 models ONLY transfer the fan inlet flange to
the new fan. Replace the seal if necessary.
6. Examine the burner gasket and replace if necessary.
7. Reassemble in reverse order, ensuring that the injector is
in place and the sensing pipe is connected to the fan.
14.4
1. Remove the collector and fan assembly as described in
section 14.3.
2. Extract the injector from the venturi.
3. Undo the screws securing the fan to the venturi and the
venturi to the collector.
IMPORTANT: When fitting the new venturi, ensure the
arrows on it's base point into the collector (Fig. 71).
Fan Inlet Flange
(18 model
4. Examine the seals and burner gasket, replace if necessary.
ONLY)
Gas Inlet
5. Reassemble in reverse order, ensuring that the injector is
in place.
Fan
14.5
1. Remove the collector and fan assembly as described in
section 14.3.
2. Extract and replace the injector and reassemble in reverse
order.
Fan (Fig. 69)
Venturi (Fig. 69)
Injector (Fig. 69)