23
IV. Venting
B. CPVC/PVC Venting (continued)
b.
Models APX625, APX725, and APX825
only:
6 in. x 6 in. two-pipe connector does not
have factory installed internal sealing gaskets at
both vent and combustion air sections. Apply a
coating of supplied red RTV silicon sealant, at
least 1 in. (25 mm) wide, around circumference
of provided 6 in. Schedule 40 x 30 in. (760 mm)
long CPVC pipe.
c. 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 worm band clamp screw.
d. 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.
e. Insert Schedule 40 PVC combustion air pipe
(installer provided) into the combustion air
section of the connector with a slight twisting
motion and secure by tightening the worm band
clamp screw. For models APX625, APX725
and APX825: Apply supplied red RTV silicon
sealant, at least 1 in. (25 mm) wide, around
circumference of installer provided 6 in.
Schedule 40 PVC combustion air pipe at end to
be inserted into vent connector.
Figure 10: Near-Boiler Vent/Combustion Air Piping
f. 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.
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.
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 8.
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.
5. Horizontal Sidewall Termination
a. Standard Two-Pipe Termination
See Figures 5A and 5B.
Summary of Contents for APEX
Page 57: ...57 VIII Electrical continued Figure 26 Ladder Diagram ...
Page 58: ...58 VIII Electrical continued ...
Page 59: ...59 Figure 27 Wiring Connections Diagram VIII Electrical continued ...
Page 105: ...105 ...
Page 109: ...109 XIII Repair Parts continued APX625 APX725 and APX825 APX825 shown ...
Page 112: ...112 XIII Repair Parts continued APX425 and APX525 ...
Page 114: ...114 XIII Repair Parts continued APX625 APX725 and APX825 ...
Page 122: ...122 ...
Page 123: ...123 ...
