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4
Venting
(continued)
B. CPVC/PVC Venting
!
WARNING
Asphyxiation Hazard.
•
Failure to follow these instructions could cause
products of combustion to enter the building,
resulting in severe property damage, personal
injury, or death.
•
Use all CPVC vent components (supplied
with boiler) for near-boiler vent piping before
transitioning to Schedule 40 PVC pipe (ASTM
2665) components for remainder of vent system.
•
Use CPVC vent components within any interior
space where air cannot circulate freely, including
through vertical or horizontal chase ways,
inside a stud wall, in closets, and through wall
penetrations.
•
The use of cellular core PVC (ASTM F891),
cellular core CPVC or Radel (polyphenolsulfone)
is prohibited.
•
All condensate that forms in the vent must be
able to drain back to the boiler.
NOTICE: Do not exceed maximum vent/
combustion air system length. Refer to "2. Vent/
Combustion Air Piping" under "A. General
Guidelines" of this section for maximum vent/
combustion air system length.
Use only vent and combustion air terminals and
terminal locations shown in "3. Vent/Combustion
Air Terminals" under "A. General Guidelines" of
this section.
1. Components
a. See Table 4-11 for CPVC/PVC vent and
combustion air components included with
boiler.
b. See Table 4-12 for CPVC/PVC installer
provided vent and combustion air
components required for optional horizontal
snorkel terminals shown in Figure 4-7.
c. See Table 4-13 for installer provided Ipex
Low Profile Vent Termination Kits.
d. See Table 4-14 for CPVC/PVC installer
provided vent and combustion air
components required for optional vertical
roof terminals shown in Figure 4-9.
2. Field Installation of CPVC/PP/SS Vent
Connector
Refer to Figure 4-15 and following steps:
a. Position the vent connector and gasket onto
106308-05 - 3/23
APEX
Installation, Operating, & Service Instructions
boiler rear panel and insert vent connector
into heat exchanger vent outlet.
b. Align vent connector plate and gasket
clearance holes with rear panel
engagement holes. Be sure combustion
sample port is on left side looking at rear
of boiler. Then, secure the connector and
gasket to the panel with four mounting
screws.
3. Near-Boiler Vent/Combustion Air Piping
Refer to Figure 4-16 and the following Steps:
a. Apply supplied dielectric grease to gasket
inside vent connector. The grease will
prevent gasket rupture when inserting
vent pipe and gasket deterioration due to
condensate exposure.
b. Install provided Schedule 40 x 30 in. (760
mm) long CPVC pipe into the vent section of
the connector with a slight twisting motion
and secure by tightening the clamp.
c. All CPVC vent components supplied with
boiler inside vent carton [Schedule 40 x 30
in. (760 mm) long CPVC pipe and 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 30 in. (760 mm) long CPVC 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.
d. Apply PVC primer and cement and insert
Schedule 40 PVC combustion air pipe
(installer provided) into the combustion air
connector with a slight twisting motion.
4. 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.
21
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