Potterton Performa 24 Installation & Servicing Instructions Manual page 32

Fig. 71
Pressure Gauge
Capillary
Gauge Retaining
Bracket
Fig. 73
Fig. 74
Vessel Outlet
Boiler
Chassis
Lock Nut
Washer
Mounting Bracket
Fig. 77
Electrode Lead
32
Timer Cover
Pressure Gauge
Expansion Vessel
Spigot
Spring
Spark Generator
12.0 Changing Components
12.14 Pressure Gauge
1. Drain the primary circuit and undo the nut on
the pressure gauge capillary (Fig. 71).
2. Remove the timer cover and ease the timer
wiring aside. Undo the screws securing the
gauge retaining bracket (Fig. 72).
3. Remove the bracket and gauge assembly.
Depress the barbs on the side of the gauge and
remove the retaining bracket (Fig. 73).
4. Reassemble in reverse order.
Fig. 72
12.15 Expansion Vessel
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.
2. Drain the system and undo all gas and water
connections. Remove the flue elbow.
Fig. 75
3. Lift the boiler off the wall bracket and lay it on
it's side on a clean flat surface.
4. Undo the nut on the vessel outlet spigot, and
remove the locknut and spring washer securing
Retaining Clip
the spigot to the boiler chassis (Fig. 74).
Upper Cross
5. Undo the screws and remove the appliance
Member
upper cross member (Fig. 76). Slide the
expansion vessel out of the retaining clips
(Fig. 75).
6. Reassemble in reverse order. Fully
recommission the appliance and system.
12.16 Spark Generator (Fig. 77)
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.
Fig. 76
3. Reassemble in reverse order.