Technical data

9.0 Changing Components

9.8 Gas Valve (Fig. 58)

IMPORTANT:After replacing the valve the CO

must be

checked and adjusted as detailed in Section 10.0 Setting

the Gas Valve. Only change the valve if a suitable

calibrated combustion analyser is available, operated by a

competent person - see Section 8.1

1. Disconnect the plug and earth wire from the gas valve and

remove the sensing pipe from between the valve and fan

outlet.

2. Remove the gas feed pipe and washers, and extract the

injector from the gas/air inlet manifold.

3. Undo the nut on the pipe from the gas cock to the valve

inlet adaptor, and remove the screws securing the adaptor to

the boiler side panel.

4. Remove the valve complete with the inlet adaptor. Transfer

the adaptor to the new valve, using a new washer if necessary.

5. Replace in reverse order of dismantling, using the screws

previously removed. Examine all sealing gaskets and washers

and replace if necessary.

NOTE: To assist the boiler to light prior to final setting, use

a suitable hexagon key to wind out the Gas/Air adjustment

screw until it is flush with the valve body, then turn the

screw 4 full turns clockwise (Fig. 58). If the boiler will not

light, or the correct CO

cannot be achieved contact the

‘heateam’ technical helpline.

PCB Control Box

removed for clarity

Gas Valve

Earth Wire

Injector

Fig. 58

Inlet Adaptor

Gas Feed Pipe