Baxi System 100 HE Plus Installation & Servicing Instructions Manual page 36

Pressure Gauge
Bracket
Lug
Pressure Gauge
Fig. 54
Capillary
Fig. 55
Pressure Relief Valve
Fig. 56
36
Return Pipe
13.0
13.10
1. Drain the boiler (see Section 13.1 paragraph 2 & 3).
2. Undo the nut retaining the capillary in the connection at
the return pipe (Fig. 55).
3. Depress the two lugs on either side of the pressure gauge
and feed through facia (Fig. 54).
4. Fit new pressure gauge and reassemble in reverse order.
13.11
1. The pressure relief valve is positioned on the hydraulic
manifold at the back of the pump.
2. Drain the boiler (see Section 13.1 paragraph 2 & 3).
3. Disconnect the union between the valve and the discharge
pipe.
4. Slacken the screw retaining the valve.
5. Pull the valve upwards to disengage it.
6. Fit the new pressure relief valve and reassemble in reverse
order.
Expansion Vessel
removed for clarity
Changing Components
Pressure Gauge
Pressure Relief Valve (Fig. 56)