AERCO KC1000 Heater Mar 2011 - Manual (Page 54)

MAINTENANCE
6-10
TO FRAME
HARNESS
BLOWER PROOF
SWITCH
AIR/FUEL VALVE
Figure 6.13
Blower Proof Switch Wire Location
(older style switch shown at left, newer style at right)
18. Loosen the hose clamp on the air/fuel valve inlet and slide the clamp back towards the blower (Figure
6.14).
HOSE CLAMP
Figure 6.14
Air/Fuel Valve Inlet Hose Clamp
19. 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 (Figure 6.15).
20. 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 (Figure 7.7).
21. Remove the air/fuel valve, taking care not to damage the flange “O”- ring.