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15.4.18 Pump
Check that the primary circuit has been fully drained as
described in 15.3 preceding.
Release the water connections and remove the pump. Refer to
Fig 45.
Disconnect and transfer the electrical connections to the new
pump. Set the pump speed to maximum. Do not forget the
gaskets at the connections.
Alternatively the pump head only [Grundfos 15-60] may be
replaced by unscrewing the four securing screws. Take care not
to scratch the mating surfaces .
15.4.19 Expansion Vessel
The specified replacement can be fitted into the system return as
close to the appliance as possible. Re-fill and pressurise the
system as described in Section 12 Commissioning.
15.4.20 Auto Air Vent
Drain the primary circuit as described in 15.3 preceding.
Unscrew and remove the auto air vent.
Do not omit the sealant (Loctite 575) when fitting the
replacement air vent.
Remove the cap. Refer to Fig 34.
15.4.21 Primary Heat Exchanger
Check that the appliance has been fully drained as described in
15.3 preceding.
Remove the combustion chamber as described in Section 14.3,
Inspection and Servicing.
Remove the temperature sensors as described in 15.4. 15, 16
and 17 preceding.
Undo the four union connections and remove the heat
exchanger.
Do not omit the sealing washers when fitting the replacement
heat exchanger. Refer to Fig 60.
15.4.22 Air Flow Switch
Carefully pull-off the connections from the switch. Unclip and
remove the switch. Refer to Fig 61.
Ensure that the connections are correctly made on the
replacement switch.
Fig.61. Air flow switch
Fig.60. Primary heat exchanger
Central heating flow
Domestic hot water
flow
Union connections
Fibre washer
27
Heat Exchanger
Central heating return
Domestic water
inlet
Fibre washer
Union connections
Air flow switch
Air flow switch leads
(green)
Red tube
Clear tube
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