Powrmatic Heater LX70

Unplug all the electrical connections

Remove the two screws that secure the control box

Fit replacement in reverse order

Verify all connections are secure and operational

Is the control box functioning correctly after replacement?

Determine type of gas connection

Unscrew the union nut downstream of the gas service valve

Remove the electrical plug connections from the top of the gas valve

Release the flanged connections at the inlet and outlet of the gas valve

Reconnect the new valve ensuring correct orientation

Renew the sealing 'O' rings if necessary

Check that all connections are secure

Disconnect the electrode leads from the control box

Remove the screw securing the electrode assembly to the burner assembly side plate

Withdraw the electrode assembly

Fit the replacement electrode assembly

Ensure that the gas service valve is turned OFF

Unscrew the union nut situated immediately downstream of the gas service valve

Disconnect the spark and rectification leads from the control box

Remove the electrical plug connections from the top of the gas control valve assembly

Remove the burner heat shield, 3 screws

Release the inlet connection flange from the gas valve by removing the four screws

Remove the four screws securing the flue outlet socket.

Disconnect the fan electrical connections from the main terminal strip.

Remove the screws securing the fan mounting box to the exhaust header plate.

Clean impeller by brushing with a stiff brush.

Re-assemble using a new sealing gasket to the fan mounting box.

Use silicon sealant around the joints.