Alpine Installation, Operating, and Service Instructions
32
103448-10- 6/18
IV. Venting B. CPVC/PVC Venting (continued)
c. Insert provided 3 in. Schedule 40 x 30 in. long CPVC pipe through air box top combination vent/
combustion air collar vent opening and slide down with a slight twisting motion, until the pipe lower end is
firmly inserted into female end of factory installed 90° elbow vent connector.
d. Secure the pipe by tightening the metal strap worm screw.
WARNING
Failure to properly secure the vent into the elbow with the clamp could lead to
property damage, personal injury or loss of life.
e. The CPVC 30 in. long straight pipe may be cut to accommodate desired vent configuration. If the CPVC
30 in. straight pipe needs to be cut into two pieces to accommodate desired vent configuration, insure that
the first vertical piece has minimum length of 12 in. and extends 1-5/8 in. above air box top, so a coupling
or an elbow can be attached to it.
f. The factory supplied CPVC vent pipe (3 in. Schedule 40 x 30 in. long CPVC pipe) must be used for near-
boiler piping before transitioning to Schedule 30 PVC (ASTM 2665) pipe components for reminder of
vent system.
g. Clean all vent and combustion air pipe joints with primer and secure with transition cement. Follow
application instructions provided on primer and cement bottles.
h. For ALP080BW and ALP105BW vent size can be reduced from 3” nominal diameter to 2” nominal diameter
by mounting installer provided 3” x 2” CPVC concentric reducing coupling or PVC concentric reducing
coupling, in vertical position only, onto the end of supplied CPVC vent pipe. See Table 5A Notes and
paragraph 6 ‘Horizontal Sidewall Termination’ and Figure 12 ‘Wall Penetration Clearances for PVC Pipe for
PVC usage for venting limitation). Thereafter, the balance of vent pipe up to vent termination can be done
with PVC (ASTM 2665) pipe.
i. For ALP080BW and ALP105BW air intake size can be reduced from 3” nominal diameter to 2” nominal
diameter by mounting installer provided 3” x 2” concentric PVC reducing coupling onto the end of PVC
(ASTM 2665) pipe mounted over air box intake collar. Thereafter, the balance of air intake pipe up to air
intake termination can be done with PVC (ASTM 2665) pipe.
j. For ALP080BF and ALP105BF vent size can be reduced from 3” nominal diameter to 2” nominal diameter
by mounting installer provided 3” x 2” concentric CPVC reducing coupling or PVC concentric reducing
coupling, in vertical position only, onto the end of supplied CPVC vent pipe/elbow combination. See Table
5A Notes and paragraph 6 ‘Horizontal Sidewall Termination’ and Figure 12 ‘Wall Penetration Clearances for
PVC Pipe for PVC usage for venting limitation. Thereafter, the balance of vent pipe up to vent termination
can be done with PVC (ASTM 2665) pipe.
5. System Assembly
WARNING
Asphyxiation Hazard. CPVC/PVC vent piping and fittings rely on glued joints for
proper sealing. Follow all manufacturer instructions and warnings when preparing pipe ends for
joining and using the primer and the cement.
a. Plan venting system to avoid possible contact with plumbing or electrical wires. Start at vent connector at
boiler and work towards vent termination.
b. Design the vent system to allow 3/8 in. (9.5 mm) of thermal expansion per 10 ft. (3.0 m) of CPVC/PVC pipe.
Runs of 20 ft. (6.1 m) or longer that are restrained at both ends must use an offset or expansion loop.
Refer to Figure 11 and Table 6A.
c. All CPVC/PVC vent and combustion air pipe joints must be cleaned with primer and glued with cement.
Follow all manufacturer instructions and warnings when preparing pipe ends for joining and using the
primer and the cement.
6. Horizontal Sidewall Termination
a. Standard Two-Pipe Termination, see Figures 5A and 5B.
i. Vent Piping
Running PVC vent pipe inside Enclosures and through Walls:
• PVC vent pipe must be installed in such way as to permit adequate air circulation around the outside
of the pipe to prevent internal wall temperature rising above ANSI Z21.13 standard specified limit.
• Do not enclose PVC venting. Use higher temperature rated CPVC pipe in enclosed spaces or to
penetrate combustible or non-combustible walls.