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4
Venting
(continued)
Table 4-32: Z-Flex, Z-Vent (SVE Series III, Z-Vent III) Stainless Steel Vent System Components, Single Wall
Boiler Model
APX425C (reduced dia. vent)
APX525C (reduced dia. vent)
APX425C (standard dia. vent)
APX525C (standard dia. vent)
APX625C (reduced dia. vent)
APX725C (reduced dia. vent)
APX825C (reduced dia. vent)
APX625C (standard dia. vent)
APX725C (standard dia. vent)
APX825C (standard dia. vent)
* Note: When using room air for combustion, use 90° elbow or tee for sidewall vent termination. Termination elbow part numbers: 2SVSTEX0390
(3 in.), 2SVSTEX0490 (4 in.). Termination tee part numbers: 2SVSTTX03 (3 in.), 2SVSTTX04 (4 in.), 2SVSTTX06 (6 in.).
See Z-Flex literature for other required component part numbers such as straight pipe, elbows, firestops, and vent supports.
b. Install CPVC/PP/SS vent connector. Follow
instructions in "2. Field Installation of CPVC/
PP/SS Vent Connector" under "B. CPVC/
PVC Venting."
c. Apply provided dielectric grease to gasket
inside vent connector that will be in contact
with adapter.
d. Push and twist adapter into vent system
connector until adapter bottoms out.
e. Tighten clamp to secure adapter in CPVC/
PP/SS vent connector.
3. System Assembly
!
WARNING
Asphyxiation Hazard.
•
Vent systems made by Heat Fab, M&G /
DuraVent and Z-Flex rely on gaskets for proper
sealing. When these vent systems are used, take
the following precautions:
•
Make sure that gasket is in position and
undamaged in the female end of the pipe.
•
Make sure that both the male and female
pipes are free of damage prior to assembly.
•
Only cut vent pipe as permitted by the
vent manufacturer in accordance with their
Instructions. When pipe is cut, cut end must be
square and carefully de-burred prior to
assembly.
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. Follow all manufacturer instructions and
warnings when preparing pipe ends for
joining and when assembling the vent/
combustion air system.
106308-05 - 3/23
Nominal Pipe Diameter
3 in. (80 mm)
APX425C & APX525C:
No Adapter Required;
4 in. (100 mm)
APX625C, APX725C,
APX825C: 2SVSR0604
6 in. (150 mm)
No Adapter Required
APEX
Installation, Operating, & Service Instructions
Sidewall * or Roof Termination:
Boiler Adapter
Straight Termination w/Screen
2SVSR0403
Figure 4-33: Field Installation of Stainless
NOTICE: The venting system must be free
to expand and contract and supported in
accordance with installation instructions included
by the original stainless steel venting component
manufacturers, Heat Fab, M&G / DuraVent or
Z-Flex, whichever applicable.
c. On horizontal pipe sections, orient all
welded seams at the 12:00 position. Do
not place longitudinal welded seams at the
bottom of horizontal sections of vent pipe.
d. Assemble the combustion air system using
either galvanized or PVC pipe.
i.
ii.
4. Horizontal Sidewall Vent Termination
a. Standard Two-Pipe Termination
See Figure 4-6.
2SVSTPX03
2SVSTPX04
2SVSTPX06
Steel Vent Adapter
If PVC piping is used, use PVC
cement to assemble the PVC intake
system components. See "B. CPVC/
PVC Venting" for combustion air pipe
installation instructions.
If galvanized piping is used, use at least
two sheet metal screws per joint. Seal
outside of all joints.
Wall Thimble
2SVSWTF03
2SVSWTF04
2SVSWTF06
33
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