Quick Start Manual

12.0 Changing Components
36
12.15 Pressure Gauge (Figs. 57 & 58)
1. Drain the primary circuit and undo the nut on the
pressure gauge capillary.
2. Remove the timer cover and ease the timer wiring
aside. Undo the screws securing the gauge retaining
bracket.
3. Remove the bracket and gauge assembly. Depress
the barbs on the side of the gauge and remove the
retaining bracket.
4. Reassemble in reverse order.
12.16 Expansion Vessel & Pre-Heat Store
(Fig. 59)
1. To replace the expansion vessel and pre-heat store
it is necessary to remove the boiler from the wall.
2. Drain the system and undo all gas and water
connections. Remove the flue elbow.
3. Lift the boiler off the wall plate and lay it on either
side on a clean flat surface.
4. Undo the unions on pipe ‘A’ and remove the pipe
(Fig. 59).
5. Undo the union on pipe ‘B’ connected to the vessel
(Fig. 59) and remove the locknut securing the vessel
spigot to the boiler chassis.
6. Undo the screws and remove the appliance upper
cross member. Slide the expansion vessel and
insulation out of the retaining clips.
7. Reassemble in reverse order using new sealing
washers. Fully recommission the appliance and system.
12.17 Spark Generator (Fig. 60)
1. Pull the electrode lead off the spark generator.
Remove the screws and spring washers securing the
generator to it’s mounting bracket.
2. Pull the rubber shroud off the generator input plug
and disconnect the plug.
3. Reassemble in reverse order.
Pressure Gauge
Timer Cover
Pressure Gauge
Capillary
Gauge Retaining
Bracket
Expansion Vessel
Retaining Clip
Appliance Upper Cross
Member
Vessel Spigots
Boiler Chassis
Lock Nut
Electrode Lead
Spark Generator
Mounting Bracket
Fig. 57
Fig. 58
Fig. 59
Fig. 60
Pipe ‘B’
Pipe ‘A’