38
221873B
14 Replacement of Parts
Disconnect the gas service cock union.
Disconnect the safety valve discharge pipe from the boiler.
Disconnect the mains supply cable at the connector block on
the back of the controls fascia.
Remove the two screws at the service cock bracket. Pull the
boiler from the isolating valves. Unhook the boiler at the top,
easing the boiler from the flue outlet and lift off.
Carefully lay the boiler down on its side for access to the
expansion vessel.
Disconnect the union nut connection, see diagram 14.22 and
discard the sealing washer for the new one supplied.
Remove the expansion vessel, secured with two clamping
screws.
Connect the union nut, when fitting the expansion vessel,
before clamping it.
14.25 Automatic Air Vent
Before starting refer to Section 11.
Remove the automatic air vent, see diagram 14.23.
SLACKEN THE SMALL CAP ON THE AIR VENT. THIS MUST
NOT BE RE-TIGHTENED.
Diagram 14.22
7015
EXPANSION
VESSEL
UNION
NUT CONNECTION
SECURING
SCREW (2)
Diagram 14.21
SEALING
WASHER (4)
6995a
PLATE TO
PLATE HEAT
EXCHANGER
SECURING
SCREW (2)
Tilt and pull out
between pump and
gas supply pipe
Remove securing
screws and push
back to release
Be sure to fit
sealing washers
when refitting
Diagram 14.20
Diagram 14.19
REAR OF THE
BOILER
SECURING
PIN (2)
BYPASS
TUBE
6981
BYPASS
VALVE
HYDRO
BLOCK
6997
SECURING
PIN
'O' RING
'O' RING (2)
