Draft Problems/Troubleshooting - Rheem OBF Series Installation Instructions Manual

CORRECTION OF POOR CHIMNEY DRAFT CONDITIONS
FIGURE 27
CHIMNEY PROBLEMS
FIGURE 28
Pipe pushed too far inside elbow, as
shown, interferes with draft.
CAUSE
1. Roof peak or other surrounding
objects higher than chimney top.
2. Flue cap on chimney.
3. Coping smaller than chimney
interior.
4. Air leak from loose bricks or
mortar.
5. Inside dimensions of chimney are
too small.
6. Double chimney separation wall
leaks due to loose bricks or
mortar.
7. Joist protruding into chimney.
8. Brick, mortar or other obstruction
lodged in chimney.
9. Soot accumulation in offset.
10. Offset is too short.
11. More than one heating appliance
connected to same chimney flue.
12. Smoke pipe protrudes into chimney
or elbow too far.
13. Smoke pipe is loose fitting, too
long or has too many elbows.
14. Opening between chimney flues.
15. Loose fitting cleanout door.
16. New chimney.
17. Excessive draft..
FIGURE 29
If chimney ends only a short
distance below point where flue
enters, make a "toothpick joint"
as shown. Remove soot from
below regularly.
CORRECTION
Extend chimney 24 inches above roof
and surrounding objects within 30 feet.
Remove.
Enlarge to match chimney interior.
Replace loose bricks and mortar.
If all other causes have been
eliminated a new chimney may have
to be built.
Replace loose bricks or mortar.
Remove.
Have chimney cleaned.
Clean out.
Straighten or lengthen offset.
Furnace ideally should have its own
flue. If this is not possible, smoke pipe
should be connected as shown in
Figure 29.
Make flush with inside of chimney.
Cement joints, shorten and eliminate
elbows.
Seal openings permanently.
Seal openings, close door tightly.
Allow 2 to 4 weeks to dry.
Open barometric damper.
FIGURE 30
If it is necessary to connect more
than one heating appliance to
the same chimney, connect
furnace flue pipe as "B." Connect
lower BTU appliance pipe as "A."
21