36
Mexico Super 440 FF - 480 FF -
Installation
SERVICING
Mex 1893
440 & 450 FF only
74 AIR PRESSURE SWITCH (APS) REPLACEMENT
73 FAN REPLACEMENT
1. Remove the lower front panel, control panel and the top
panel. Refer to Frame 57.
2. Remove the APS fixing screw.
3. Remove both sensing tubes from the APS.
4. Remove the 3 electrical connections from the APS.
5. Connect the new APS in reverse order.
6. Refit the APS with the fixing screw.
7. Refit the boiler casing.
8. Check the boiler operation.
75 PRINTED CIRCUIT BOARD (PCB) REPLACEMENT
1. Remove the 2 screws and lift off the lower
front panel. Refer to Frame 57.
2. Undo the PCB cover fixing screw and
remove the cover.
3. Remove the HT lead from the PCB.
4. Remove the 6 push-in connectors from the
PCB.
5. Compress the barbs on the PCB stand-
offs to release the PCB from the box
6. Fit the new PCB and reassemble in
reverse order.
7. Refit the boiler casing.
8. Check the operation of the boiler.
1. Remove the lower front panel, control panel and top panel. Refer to Frame 57.
2. Remove the silicon rubber tube from the sensing point.
3. Disconnect the fan leads.
4. Remove the M4 screw securing the flue connector to the fan.
5. Slacken the 2 M4 screws securing the flue connector to the turret front panel.
6. Disconnect the silicon rubber tube from the top of the collector hood.
7. Remove the 4 M4 screws on the top of the collector hood
and, by sliding it forward, remove collector hood / fan
assembly.
8. Remove the 3 M4 screws retaining the fan to the collector
hood.
9. Reassemble in reverse order. Lubricate the fan 'O' ring
with silicon grease. Ensure the fan leads and 2 sensing
tubes are reconnected.
10. Refit the boiler casing.
11. Check the boiler operation.
SER
VICING
