Powrmatic Air Heater NV25-F

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

Installation of New Pressure Switch

Fit replacement in reverse order

Inspect fan blades for damage and excessive deposits

Slacken the cable gland on the heater casing

Disconnect fan leads from electrical terminals on the PCB

Withdraw cable through entry grommet

Remove fan and motor assembly by removing four hexagon headed bolts

Reassemble fan and motor assembly in reverse order

7.5.2 Centrifugal Fan/Silencer Section

Inspect fan blades for damage and excessive deposits

Remove the burner assembly as described in Section 7.2

Remove the end plates of the burner assembly

Remove the central burner support plate

Reassemble components in reverse order

Re-commission the appliance as described in Section 6

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 in reverse order

Ensure the valve is correctly orientated