Powrmatic Air Heater NV40-F

Disconnect all electrical connections

Release the PCB from mounting posts

Remove the PCB from its mounting posts

Fit replacement PCB in reverse order

Remove the screws securing components

Disconnect the fan electrical connections from the terminals on the PCB

Remove fan assembly by pulling forwards and to the left to disengage the retaining lugs

Is it necessary to transfer the fan mounting box to the replacement fan?

Fit replacement exhaust fan using new gaskets and silicone sealant as necessary

Disconnect electrical connections

Pull off the sensing tube from the air pressure switch

Note the setting of the old pressure switch

Remove the screws fixing the air pressure switch and remove switch

Installation of New Pressure Switch

Fit replacement in reverse order

Refit the sensing tube to the negative (- or L) tapping on the pressure switch

Ensure thermostats are set correctly before fitment

Remove the screws securing the thermostat phial mounting plate to the inner bulkhead

Withdraw assembly and unclip the phial

Remove the electrical connections from the limit thermostat

Remove the securing nut and remove thermostat from the front panel

Fit replacement thermostat in reverse order

Remove the burner assembly as described in Section 7.2

Multifunctional Control Removal

Release the flanged connections at the inlet of the multifunctional control

Release the flanged connections at the outlet of the multifunctional control

Remove the multifunctional control

Reconnect the new valve ensuring correct orientation

Renew the sealing O-rings if necessary