MAINTENANCE
6-11
21. Loosen the three 1-1/16” nuts that hold the manifold. Remove the two side nuts. DO NOT REMOVE
THE FRONT NUT, (See Fig. 6.16).
22. Carefully pull the manifold down and back, removing it through the back of the unit.
23. Inspect the exhaust manifold and exhaust tubes for debris. Clean out any debris as necessary.
24. Inspect the combustion chamber and the combustion chamber liner. Replace the liner if any signs of
cracking or warpage are evident.
NOTE:
See Figure 6.21 on page 6-19 for a drawing showing manifold gasket locations and part numbers.
NOTE:
Install the combustion chamber liner prior to reinstalling the exhaust manifold.
Figure 6.16
Manifold Nut and Bolt Locations
25. Replace the gasket between the manifold and the combustion chamber (P/N GP-122537). The use of
Permatex or a similar gasket adhesive is recommended.
26. Replace the gasket between the manifold and tubesheet (P/N GP-18900). Do not use any gasket
adhesive; this gasket has an adhesive backing
27. Beginning with the manifold, reinstall all the components in the reverse order that they were removed.
Replace the o-ring seals removed with the air/fuel valve. AERCO recommends that NEW o-ring seals
be used when reassembling.
6.8.1 PROPANE UNITS
For propane units it will be necessary to remove the air mix assembly, in addition to the steps outlined in
paragraph 6.8. Proceed as follows:
1. Follow steps 1 through 5 in paragraph 6.8.
2. Using a wrench, loosen the two compression fittings holding the 1/4” feedback tube between the
burner and air regulator and remove the feedback tube. (See Fig. 6.17)
3. Using a 1-1/16” wrench or an adjustable wrench loosen and remove the 12” flexible gas hose.
4. Proceed back to paragraph 6.8 and continue at Step #6.
NOTE:
Older propane units have a 1/8” Feedback Tube and 1/8” OD tube compression fittings.
MANIFOLD
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