Burnham Apex APX399 Installation, Operating And Service Instructions page 23

iV. Venting
B. CPVC/PVC Venting (continued)
e. Clean all vent and combustion air pipe joints
with primer and secure with transition cement
(4-oz. bottles of primer and cement are
supplied with boiler inside vent carton). Follow
application instructions provided on primer and
cement bottles.
APX800 Boiler Model:
f. 6" x 6" Two-Pipe CPVC/PVC Vent System
Connector (P/N 102183-03), used on APX800
boiler model, does not have factory installed
internal sealing gaskets at both vent and air
intake sections and requires use of supplied red
RTV silicon sealant to seal vent and combustion
air pipes to the connector.
g. Apply a coating of the sealant, at least 1" wide,
onto provided 6" Schedule 40 x 30" long CPVC
pipe.
h. Insert the coated end of the CPVC pipe with a
slight twisting motion into the connector vent
section and secure by tightening the metal strap.
i. All CPVC vent components supplied with
boiler inside vent carton (6" Schedule 40 x 30"
long CPVC pipe and 6" Schedule 80 CPVC
90° Elbow) must be used for near-boiler piping
before transitioning to Schedule 40 PVC (ASTM
2665) pipe components for remainder of vent
system. The CPVC 30" long straight pipe may be
cut to accommodate desired vent configuration
provided both pieces are used in conjunction
with CPVC 90° Elbow before any PVC
components are used. Ensure that the CPVC 90°
Elbow is the first elbow used in the vent system
as it exits the boiler.
j. Apply a coating of the sealant, at least 1" wide,
onto 6" Schedule 40 PVC combustion air pipe
(installer provided).
k. Insert the coated end of the PVC pipe with a
slight twisting motion into the connector air
intake section and secure by tightening the metal
strap.
l. Clean all vent and combustion air pipe joints
with primer and secure with transition cement
(4-oz. bottles of primer and cement are
supplied with boiler inside vent carton). Follow
application instructions provided on primer and
cement bottles.
Horizontal Vent Termination
5.
a. Standard Two-Pipe Termination
See Figures 8 through 11.
i.
Vent Piping
Running PVC vent pipe inside Enclosures
and thru Walls:
Figure 8: Wall Penetration Clearances for PVC Vent Pipe
• 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.
• PVC vent pipe may not be used
to penetrate combustible or non-
combustible walls unless all following
three conditions are met simultaneously
(see Figure 8 " Wall Penetration
Clearances for PVC Vent Pipe"):
- The wall penetration is at least 66
Figure 9a: Direct Vent - Sidewall Terminations
inches from the boiler as measured
along the vent
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