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11.0 Changing Components
43
11.16
Pressure Gauge
1. Isolate the appliance from the water system by
closing the flow and return taps.
2. Drain the boiler of water.
3. Undo the
1
/
4
turn screws and drop the facia
panel down.
4. Undo the nut on the gauge capillary at the
boiler flow connection (Fig. 131).
5. Press in the two lugs on the gauge body, and
pass the gauge and capillary through the facia
(Fig. 130).
6. Fit the new gauge in reverse order and
recommission the appliance.
11.17
Pressure Relief Valve
(Fig. 129)
1. Isolate the appliance from the water system by
closing the flow and return taps.
2. Drain the boiler of water.
3. Undo the
1
/
4
turn screws and drop the facia
panel down.
4. Undo the nut on the pressure relief pipe and
slacken the screw holding the valve to the
manifold.
5. Fit the new valve in reverse order and
recommission the appliance.
11.18
Re-pressurising Expansion Vessel
1. The charge pressure is 1.0 bar.
2. Close the central heating flow and return
isolating valves.
3. Drain the boiler of water.
4. The expansion vessel valve is situated to the
right of the combustion box, below the expansion
vessel.
5. Pressurise to 1.0 bar.
6. Open the isolating valves and recharge the
system to 1.0 bar.
7. Vent the system as necessary.
Fig. 131
Fig. 129
Lug
Capillary
Return Pipe
Pressure
Relief Valve
Pressure Gauge
Fig. 130
