Powrmatic Air Heater NV25-D

Ensure thermostats are set correctly before fitment

Verify Limit Thermostat settings

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

Withdraw assembly and unclip the phial

Remove electrical connections from the limit thermostat

Remove securing nut and thermostat from the front panel

Fit replacement thermostat in reverse order

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

Check that the spark gap is 2.5 mm

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 and reassemble in reverse order

Check the direction of rotation for a 3-phase motor

If the direction of rotation is incorrect, interchange any two of the three phases connected to the motor

Disconnect all electrical connections

Number of PCB mounting posts to release

Squeeze in the retention tag at each mounting post and release the PCB

Remove the PCB from its mounting posts

Fit replacement PCB in reverse order

Remove the burner assembly as previously 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 the reverse order

Ensure the valve is correctly orientated