Crown Boiler PHNTM399, Installation And Operating Instructions Manual

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IV. Venting
D. Stainless Steel Venting (continued)
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.
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.
ii. If galvanized piping is used, use at least two
sheet metal screws per joint. Seal outside of
all joints
4. Horizontal Sidewall Vent Termination
a. Standard Two-Pipe Termination
See Figure 5.
i. Vent Termination
• Use a stainless steel tee in the upright
position.
NOTICE
The joint between the terminal and the last piece
of pipe must be outside of the building.
• Male end of terminal will fit into female
end of any of the listed stainless vent
systems.
• Apply a heavy bead of silicone to the
male end of the terminal before inserting
it into the last piece of pipe. Orient the
terminal so that the seam in the terminal
is at 12:00.
• Smooth the silicone over the seam
between the terminal and the last piece
of pipe, applying additional silicone if
necessary to ensure a tight seal.
• Allow the silicone to cure per the silicone
manufacturer’s instructions before
operating the boiler.
ii.
Combustion Air Termination
• Use a tee in the upright position. Tee
should protrude the same distance from
the wall as the exhaust terminal as shown
in Figure 5.
• Install a rodent screen (not supplied) in
the inlet terminal. Use a screen having
1/2 in. x 1/2 in. (13 mm x 13 mm) mesh.
b. Optional Two-Pipe Snorkel Termination
See Figures 6A and 6B.
This installation will allow a maximum of
7 ft. (2.1 m) vertical exterior run of the vent/
combustion air piping to be installed on the
approved AL29-4C stainless steel horizontal
venting application.
i. Vent Termination
• After penetrating wall, install the
appropriate manufacturer’s 90° elbow so
that the elbow leg is in the up direction.
• Install maximum vertical run of 7 ft.
(2.1 m) of appropriate manufacturer’s
vent pipe as shown in Figure 6A.
• At top of vent pipe length install another
appropriate manufacturer’s 90° elbow
so that the elbow leg is opposite the
building’s exterior surface.
• Install horizontal vent terminal.
• Brace exterior piping if required.
ii. Combustion Air Termination
• After penetrating wall, install a 90°
elbow so that the elbow leg is in the up
direction.
• Install maximum vertical run of 7 ft.
(2.1 m) of combustion air pipe as shown
in Figure 6B.
• At top of vent pipe length install another
90° elbow so that the elbow leg is
opposite the building’s exterior surface.
• Install rodent screen (not supplied) and
horizontal vent terminal.
• Brace exterior piping if required.
5. Vertical Vent Termination
a. Standard Two-Pipe Termination
See Figures 7 and 8.
i. Vent Termination
• Use the terminal supplied by the vent
system manufacturer shown in Table 11.
Follow manufacturer’s instructions to
attach terminal to vent system.
ii. Combustion Air Termination
• Install vertical combustion air terminal.
Vertical combustion air terminal consists
of a 180° bend (comprised of two 90°
elbows) as shown in Figure 7.
• Install rodent screen (not supplied) in the
combustion air terminal. Use a screen