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Pressure Gauge
Capillary
Fig. 57
Gauge Retaining
Bracket
Fig. 58
Vessel Outlet
Boiler
Chassis
Lock Nut
Washer
Fig. 59
Mounting Bracket
Electrode Lead
36
Timer Cover
Pressure Gauge
Expansion Vessel
Spigot
Spring
Spark Generator
Fig. 60
12.0 Changing Components
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 (Fig. 59)
1. To replace the expansion vessel it is
necessary to remove the boiler from the wall.
NOTE: Alternatively a vessel of equivalent
capacity can be fitted on the system return
pipe as close as possible to the boiler.
Retaining Clip
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 nut on the vessel outlet spigot, and
remove the locknut and spring washer securing
Upper Cross
Member
the spigot to the boiler chassis.
5. Undo the screws and remove the appliance
upper cross member. Slide the expansion vessel
out of the retaining clips.
6. Reassemble in reverse order. 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 its mounting
bracket.
2. Pull the rubber shroud off the generator input
plug and disconnect the plug.
3. Reassemble in reverse order.
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