STEP 29:
Examine the combustion package assembly. Check the heat exchanger for
distortion, loose spot welds, etc. Check the right and left heat deflectors
for distortion. Check the refractory stainless steel cover for distortion.
Replace any defective parts. Check the catalyst block for general
deterioration. Check the refractory chamber and the catalyst block access
panel for breaks, chips, separations, etc. If the catalyst block, refractory
chamber and refractory access panel are in good condition, clean them
with low pressure air from your vacuum cleaner.
STEP 30:
Remove the catalyst access plate from the stove back, 4 each, ¼-20 x 5/8”
Phillips round head machine screws. Remove the secondary air cover
plate from the stove back, 2 each, ¼-20 x 3/8” Phillips pan head machine
screws. Remove the secondary air flap, 1 each, 10-24 x ¼” Phillips pan
head machine screw and 1 each, shim ring. Remove the secondary air link
from the air flap. Remove the secondary air probe, 1 each, 10-24 x ¼”
Phillips pan head machine screw. Separate the air link from the secondary
air probe. Check the air flap and air link for distortion. Check the air flap
and air link for distortion. Check the air probe coil for breaks and/or heat
damage. Replace any suspect parts.
STEP 31:
Examine all castings for cracks, chips, distortions, etc. Remove all old
gasket material from the gasket channels and mating surfaces. Remove all
gasket and furnace cement from channels and mating surfaces using the
appropriate size punch/drive pin in the channels and cold chisels on the
flanges and flat mating surfaces. Clean all channels and mating surfaces
with a wire brush (hand or power).
STEP 32:
Examine all mechanical linkage parts for distortion, worn or egg shaped
drillings, unusual wear, burrs, etc. Repair or replace as necessary.
Replace any bent tabs or clips.
