Technical data

13.0 Changing Components

13.13 Safety Pressure Relief Valve (Fig. 55)

1. Close the flow and return isolation taps and drain the

primary circuit.

2. For access remove the screws securing the

condensate trap, and pull off the pipe from the heat

exchanger. Ease the trap to one side.

3. Disconnect the discharge pipe from the pressure relief

valve and remove the sealing grommet.

4. Pull off the clip retaining the valve and withdraw it

from the outlet assembly.

5. Fit the new valve and ‘O’ ring seal and reconnect the

discharge pipe. Ensure the grommet is correctly refitted

to maintain the integrity of the case seal. Refit the

condensate trap.

13.14 Heating Pressure Gauge (Figs. 56 & 57)

1. Close the flow and return isolation taps and drain the

primary circuit.

2. Remove the gauge from the boiler lower panel.

3. Remove the clip securing the pressure gauge capillary.

4. Fit the new gauge, ensuring that the capillary is routed

to prevent any sharp bends. Reassemble in reverse order

and ensure the gauge is firmly in position to maintain the

integrity of the case seal.

Fig. 57

Heating Pressure

Gauge Capillary

Clip

‘O’ Ring Seal

Pressure Relief

Valve

Discharge Pipe

Control Box removed

for clarity

Fig. 55

Fig. 56

Heating

Pressure

Gauge