AIC N 100 WH, Installation And Maintenance Manual

Page: 52 / 80

I-52
Z-038791_EN • Rev A
M
aintenance
Removing and Installing the Fan and Air-
Gas Mixer Assembly
Conditions:
Tools and material:
î
Wrench, hex head, size 5
î
Wrench, flat
î
Torque wrench
Removal Procedure:
1. Disconnect all connectors and ground wires
from the electrodes, the fan and the gas
valve.
2. Disconnect the air inlet duct (
1
) from the air-
gas mixer.
3. Release gas pipe connection (
2
) from the gas
valve (
3
).
4. Release three screws and washers (
4
) secur-
ing the fan assembly (
5
) to the burner door.
5. Remove the assembly (
5
) formed by the fan,
the air-gas mixer and gas valve. Retain for
reinstallation.
6. Remove the fan gasket (
6
) and retain, as re-
quired, for reinstallation.
When removing the gasket, check its
general condition. Discard and re-
place the gasket if it is cracked or
torn.
7. Remove the electrodes, as required, refer to
“Removing and Installing the Ignition and
Ionisation Electrodes” on page I-51.
8. Remove the burner, as required, refer to
“Removing and Installing the Burner” on
page I-54.
9. Clean the combustion chamber, as required,
refer to “Checking and Cleaning the Com -
bustion Chamber” on page I-56.
OFF
i
Installation Procedure
1. Install the fan assembly (
5
) with a new gas-
ket (
6
) (if required) on the burner door, using
three retained screws and washers (
4
).
2. Torque the screws (
4
) at 4 Nm.
3. Connect gas pipe (
2
) to gas valve (
3
)
4. Connect the air inlet duct (
1
) to the air-gas
mixer.
5. Reconnect all connectors to the electrodes,
gas valve and fan.
Follow-on task(s):
1. Close all panels, refer to “Removing and In -
stalling the Access Panels” on page I-28.
2. Restart the boiler, as required, refer to “Re -
starting after Maintenance” on page I-50.