Powrmatic Air Heater NV75-F

Remove the burner assembly as previously described in Section 7.2

Release the flanged connections at the inlet and outlet of the multifunctional control

Remove the multifunctional control

Reconnect the new valve ensuring correct orientation

Renew the sealing O-rings if necessary

Disconnect the electrical connections to the centrifugal fan section

Remove the side panels of the section for access to the fan and motor

Fit replacements as appropriate

Is a 3-phase motor being replaced?

Is the direction of rotation correct?

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

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

Disconnect the electrode leads from the PCB terminal

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

Withdraw the electrode assembly

Fit the replacement electrode assembly