AIC Nesta N 120 FS, Installation And Maintenance Manual, Page: 51 / 72

Fig. 20. Removing and Installing the Burner
1
2
3
4
3
5
I-51
A-070336_EN • Rev. A
M
aintenance
Removing and Installing the Burner
Conditions:
î
Fan and air adapter assembly removed, refer
to “Removing and Installing the Fan and Air
Adapter Assembly” on page I-48.
Tools and material:
î
Wrench, flat, size 13
î
Torque wrench
î
Air compressor
î
Protective gloves
î
Face mask
Removal Procedure:
1. Release four nuts (
1
) securing the fan plate
(
2
). Remove the fan plate and its hardware.
Retain for reinstallation.
2. Extract burner tube (
4
) with upper and lower
gaskets (
3
) from the heat exchanger. Discard
the gaskets.
Cleaning and Checks:
1. Visually check the condition of the burner
tube (
4
).
2. Wearing protective gloves and a face mask,
clean with compressed air to remove residues.
If it is in bad condition after cleaning, replace it.
OFF
3. Clean the combustion chamber, see “Check-
ing and Cleaning the Combustion Cham-
ber” on page I-52 .
Installation procedure:
1. Install new lower gasket (
3
) on burner tube
(
4
) flange.
2. Install burner tube (
4
) into heat exchanger.
3. Install new upper gasket (
3
) on burner tube (
4
)
flange.
4. Place the fan plate (
2
) in position on the studs (
5
).
5. Install four retained nuts (
1
) on the studs.
Torque first in a crosswise pattern at 3Nm,
then repeat the operation at 6 Nm.
Follow-on tasks:
1. Reinstall the fan and air adapter assembly,
refer to “Removing and Installing the Fan
and Air Adapter Assembly” on page I-48
2. Reinstall all removed access panels, refer
to “Removing and Installing the Access
Panels” on page I-27.
3. Restart the appliance, see “Restarting after
Maintenance” on page I-46.