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Modu-Fire
®
Gas-Fired Boiler Maintenance
26
8. Before re-installing the burner, check the
cleanliness of the heat exchanger and the condi-
tion of the combustion chamber. If corrosion or
leaks are noticed, (green or otherwise, please
call the factory for assistance)
9. Install the burner and mixer core. Reconnect
the pilot tube, main gas union, 4 burner hold
down nuts, electrode wire, ground wire, mixer
core tube, UV Scanner. Be sure the Pilot tube is
not touching any other component.
5.3
REMOVING THE EXCHANGER
1. Remove the burner as above.
2. Remove the front doors by pulling forward and
upward.
3. Remove the top panel of the inner cabinet.
4. Close the isolation valves to the system.
5. Drain the boiler.
6. Disconnect the supply and return lines.
7. Remove the manifold assembly containing the
temperature-pressure indicator, relief valve and
the water flow switch (on the D series units dis-
connect at the grooved pipe coupling [Victau-
lic]).
8. Remove the nuts and bolts from the flanges of
the inlet and outlet nozzles at the rear of the
outer casing.
9. Remove the exchanger and clean the fins.
Note: The inner and outer cabinets are separate
parts and reassembly is easier if the inner cabinet
and exchanger are removed together as one unit.
WARNING!
The heat exchanger is heavy; use proper lifting
equipment and techniques.
5.4 AFTER ALL REPAIRS OR MAINTENANCE
1. Follow "Pre-Start Check List" (Section 3.10)
and all "Safety Checks" (Section 3.11).
2. Check gas pressure and adjust gas flow if neces-
sary. (See "Gas Pressure Adjustment", Section
3.12.3.)
3. Check air pressure and adjust air flow if neces-
sary. (See "Air Flow Adjustment", Section
3.12.2.)
4. Perform combustion check.
Pilot
Tube
Ceramic Spider
Ignition
Electrode