Carrier BW9 Series Installation Instructions Manual page 9

Length of Pipe (ft.)
20
40
60
Length of Pipe (ft.)
20
40
60
* Outside diameter
The length of pipe or tubing should be measured form the gas meter or propane second stage regulator
3. The venting system shall terminate at least 3 feet above
any forced air inlet (except the boiler's combustion air
inlet) within 10 feet. The venting system shall terminate at
least 12 inches from any air opening into any building.
The bottom of the vent shall be located at least 12 inches
above grade. Termination of the vent shall be not less than
7 feet above an adjacent public walkway. The vent
terminal shall not be installed closer than 3 feet from the
inside corner of an L shaped structure. Termination of the
vent should be kept at least 3 feet away from vegetation.
The venting system shall terminate at least 4 feet
horizontally from, and in no case above or below electric
meters, gas meters, regulators, and relief equipment. If
multiple terminations are used, there must be a minimum
of 3 feet between the exhaust of one termination and the
air intake of the next termination.
INSTALLATION
1. Attach combustion air intake piping to supplied Fernco 2"
coupling on CVI gas valve. Attach vent piping to
furnished 2" CPVC vent tee on draft inducer outlet.
NOTE: All pipe joints are to be watertight
2. Working from the boiler to the outside, cut pipe to
required length(s).
3. Deburr inside and outside of pipe. Remove all chips and
shavings.
4. Chamfer outside edge of pipe for better distribution of
primer and cement.
Table 3—Gas Piping Sizes
NATURAL GAS
Pipe Capacity --- BTU per hour Input Includes Fittings
1/2"
92,000
63,000
50,000
PROPANE GAS
Pipe Capacity --- BTU per hour Input Includes Fittings
Copper Tubing*
5/8"
131,000
90,000
72,000
12" MINIMUM VERTICAL
SEPARATION BETWEEN
COMBUSTION AIR INTAKE
AND VENT
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL
Fig. 8 --- Roof Vent/Intake Terminations
3/4"
190,000 350,000
130,000 245,000
105,000 195,000
3/4"
216,000 189,000
145,000 129,000
121,000 103,000
5. Clean and dry all surfaces to be joined.
6. Check dry fit of pipe and mark insertion depth on pipe.
NOTE: It is recommended that all pipes be cut, prepared, and
pre- -assembled before permanently cementing any joint.
7. 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 the inside of socket to prevent
buildup of excess cement. Apply second coat.
8. While cement is still wet, insert pipe into socket with a 1/4
turn twist. Be sure pipe is fully inserted into fitting socket.
9. Wipe excess cement from joint. A continuous bead of
cement will be visible around perimeter of a properly
made joint.
10. Handle pipe joint carefully until cement sets.
11. Support combustion air and vent piping a minimum of
every 5 feet using pre- -formed metal hanging straps. Do
not rigidly support pipes.
expansion and contraction.
NOTE: Rigid supports will cause excess noise in vent piping
12. Slope combustion air and vent pipes toward boiler a
minimum of 1/4" per linear foot with no sags between
hangers.
13. Use appropriate methods to seal openings where vent and
combustion air pipes pass through roof or side wall.
15" MAXIMUM
3" MAXIMUM
SEPARATION
9
1" 1--- 1/4"
625,000
445,000
365,000
Iron Pipe
1/2" 3/4"
393,000
267,000
393,000
Allow movement due to
COMBUSTION
AIR
A99164