DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONS Page 35
Heat Exchanger Removal, Cleaning & Replacement -
See Figure 20
1. Close the shut off valves in the inlet and outlet
piping. On heating systems close the system fi ll
valve and relieve the system pressure from the
boiler by carefully lifting the relief valve or opening
the drain valve.
2. Drain the boiler/water heater and disconnect it from
the system piping.
3. Remove the inlet/outlet and return headers.
4. Remove the front jacket panels.
5. Loosen, 4 turns, but don't remove the 6 screws (3
on each side) holding the heat exchanger upper
rails in place, Figure 21.
6. Disconnect gas piping at the ground joint union(s).
Also disconnect the pressure sensing lines, pilot
tubing and ignition and sensing leads.
7. Remove the upper partition panel, 1050 thru 2100
models.
8. Remove the 1/4 inch nuts and washers holding the
upper combustion chamber front panel in place and
carefully remove it.
9. Carefully slide the heat exchanger out of the unit.
10. Remove the "V" baffl e straps and "V" baffl es.
11. Thoroughly inspect the heat exchanger for signs of
damage. If there is no damage, clean the heat
exchanger with water from a high-pressure hose.
Use a soft bristle brush if necessary.
CAUTION: Never clean the heat exchanger while it’s
in the boiler/water heater or the combustion
chamber will be destroyed!
12. Sagging or distorted heat exchanger tubes are an
indication of low water fl ow through the system. A
leaking or otherwise damaged heat exchanger must
be replaced and the condition that caused the
damage resolved before the boiler/water heater is
returned to service.
13. If the heat exchanger isn't damaged rewire the heat
exchanger baffles in place and slide the heat
exchanger back into the unit.
14. Reinstall all of the other components in the reverse
order of their removal.
Figure 20 - Burner and Heat Exchanger Servicing
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