AERCO KC1000 Heater w/Mod-Box Controller - Manual (Page 40)

MAINTENANCE
35
Figure 6.15
Air/Fuel Valve Inlet Hose Clamp
16. Using an 11/16” wrench, loosen the
compression fittings on the feedback tube
between the air/fuel valve and the differential
pressure regulator. Remove the feedback
tube, (See Fig. 6.16).
17. Using two 9/16” wrenches remove the two
3/8-16 hex nuts and bolts securing the
air/fuel valve to the differential pressure
regulator, (See Fig. 6.16).
18. Remove the air/fuel valve taking care not to
damage the flange “O” ring.
Figure 6.16
Feedback Tube and Air/Fuel Valve to
Differential Regulator Bolts
19. Remove the flue venting from the exhaust
manifold.
20. Removing the exhaust manifold insulation
will prevent it from being damaged and will
make it easier to handle the exhaust
manifold once it is removed. Using a 7/16”
wrench or socket remove the 3 bolts and
fender washers securing the insulation to the
exhaust manifold.
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.
6.17).
22. Carefully pull the manifold down and back,
removing it through the back of the unit.
23. Inspect the 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:
Install the combustion chamber liner prior to
reinstalling the exhaust manifold
Figure 6.17
Manifold Nut and Bolt Locations
25. Replace the gasket between the manifold
and the combustion chamber (P/N GP-