Powrmatic Heater LX50

Remove screws fixing filter box side cover

Withdraw original filters from the sliders

Fit replacement filters as appropriate

Reassemble filter box in reverse order

Unplug all the electrical connections

Remove the two screws that secure the control box

Fit replacement in reverse order

Verify the following connections are secure

Is the control box functioning correctly after replacement?

Remove the two screws securing the cover

Disconnect electrical connections

Pull off the sensing tube from the air pressure switch

Remove the screws fixing the air pressure switch

Fit replacement air pressure switch

Disconnect the thermistor from the exhaust fan outlet

Disconnect the two pin plug and socket connected to the end of the red/white cable situated behind the electrical chassis plate

Fit replacements as appropriate

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