Air Intake - Dunkirk Q90-50 Installation, Operation & Maintenance Manual

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Installation
1. Attach combustion air intake piping using field supplied
2" flexible coupling. Attach vent piping to furnished 2"
vent pipe connector on draft inducer outlet.
2. All pipe joints are to be water tight
3. Working from boiler to outside, cut pipe to required
length(s).
4. Deburr inside and outside of pipe.
5. Chamfer outside edge of pipe for better distribution of
primer and cement.
6. Clean and dry all surfaces to be joined.
7. Check dry fit of pipe and mark insertion depth on pipe.
8. After pipes have been cut and pre-assembled, apply
cement primer to pipe fitting socket and end of pipe to
insertion mark. Quickly apply approved cement to end
of pipe and fitting socket (over primer). Apply cement
in light, uniform coat on inside of socket to prevent
buildup of excess cement. Apply second coat.
9. While cement is still wet, insert pipe into socket with
1/4turn twist. Be sure pipe is fully inserted into fitting
socket.
10. Wipe excess cement from joint. Continuous bead of
cement will be visible around perimeter of properly
made joint.
11. Handle pipe joint carefully until cement sets.
12. Support combustion air and vent piping minimum of
every 5 feet using pre-formed metal hanging straps.
Do not rigidly support pipes. Allow movement due to
expansion and contraction.
13. Slope horizontal portion of combustion air and vent
pipes toward boiler minimum of 1/4" per linear ft.
(21mm/m) with no sags between hangers.
14. Use appropriate methods to seal openings where vent
and combustion air pipes pass through roof or side
wall.
To avoid nuisance trips under high wind conditions,
an inlet tee is required for side wall venting. See
figures 13 and 14 page 25.
Figure 12 - Roof Vent / Intake Terminations
15" MAXIMUM
3" M_IMUM_
SEPARATION_
8" (203mm) Minimum
Vertical Separation
Between Combustion
Air Intake and Vent
MIM1MUM
12" (305mm) US,
18" (458mm) Canada
Minimum Above
Anticipated Snow Line
AIR INTAKE
COMBUSTION
AiR