Baxi Barcelona System Installation And Servicing Instructions page 32

13.0 Changing Components - Page 32
13.10 Interface PCB
1. Pull the control knob off the spindle and remove the
securing nut and washer (Fig. 53).
2. Lift the PCB from the facia box and remove the electrical
connections (Fig. 54).
3. Fit the new PCB and reassemble in reverse order.
13.11 Pressure Gauge
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. 56).
3. Depress the two lugs on either side of the pressure
gauge and feed through facia (Fig. 57).
4. Fit new pressure gauge and reassemble in reverse order
13.12 Pressure Relief Valve (Fig. 58)
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.