3. Remove the screws holding the fan box assembly to the
exhaust header and remove the assembly.
4. Clean impeller by brushing with a sti brush
5. Re-assemble using a new sealing gasket to the fan
mounting box. Use silicon sealant around the joints.
6. Re-commission the unit.
2.7.4.1. HEM 60 to 200
1. Disconnect the fan electrical connections from the main
terminal strip and the air pressure sensing tube from the
fan.
2. Loosen the six screws holding the main control panel,
lift the control panel up and clear of the xing position
(taking care not to snag the wiring) and move to one side.
3. Whilst supporting the fan motor remove the three
screws securing the fan motor mounting plate to the fan
casing and carefully withdraw the motor, mounting plate
and impeller.
4. Clean impeller by brushing with a sti brush
5. Reassemble in reverse order.
6. Re-commission the unit
2.7.5. Heat Exchanger
Whilst the main burner assembly is removed from the unit,
check that the primary sections that the burners re into
are clean.
2.7.6. Replacement of Faulty Components
2.7.6.1 Multifunctional Control
1. Remove the electrical plug connections from the top of
the multifunctional control.
2. Release the anged connections at the inlet and
outlet of the multifunctional control and remove the
multifunctional control.
3. Reconnect the new valve in the reverse order to that
above ensuring that the valve is correctly orientated.
Renew the sealing 'O' rings if necessary.
2.7.6.2. Burners
1. Remove the burner assembly as described in Section
2.3.2.
2. Remove the end plates of the burner assembly and the
central burner support plate.
3. Exchange burners as required and reassemble
components in reverse order.
4. Re-commission the appliance as described in Section 2.2.
2.7.6.3. Electrode Assemblies
1. Disconnect the electrode leads from the control box as
appropriate.
2. Remove the screw securing the electrode assembly to
the burner assembly side plate and withdraw the assembly.
3. Fit replacement and reassemble in reverse order. Check
that the spark gap is 2.5mm (See section 2.3.3) and the
rectication electrode is 10 - 12mm forward of the burner.
2.7.6.4. Limit Thermostat
N.B Ensure that the thermostats are set correctly before
tment. The limit stat setting is 90 °C
1. Remove the screws that secure the thermostat phial
mounting plate to the inner bulkhead, withdraw assembly
and unclip the phial.
2. Remove the electrical connections from the limit
thermostat noting the terminals used.
3. Remove the nut that secures the body of the thermostat
to the controls panel and remove thermostat.
4. Fit replacement thermostat in reverse order.
5. Re-commission the unit.
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