Direct Vent - Vertical With Sepa- Rate Pipes; Prepare Roof Penetrations - Williamson-Thermoflo GWC-070 Manual

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DIRECT VENT —
Allowable vent/air pipe materials &
lengths
Use only the vent materials and kits listed
in Figure 40, page 33. Provide pipe adapt-
ers if specified.
1. Locate the terminations such that the total air pip-
ing and vent piping from the boiler to the termina-
tion will not exceed the maximum length given in
Figure 39, page 32.
Determine termination location
1. The air and vent terminations must be installed as
shown in Figure 49, page 41.
2. The terminations must comply with clearances and
limitations shown in Figure 41, page 35.
3. Locate the terminations so they are not likely to be
damaged by foreign objects, such as stones or balls,
or subject to buildup of leaves or sediment.
Multiple vent/air terminations
1. When terminating multiple GWC boilers, termi-
nate each vent/air connection as described in this
section.
Terminate all vent pipes at the same
height and all air pipes at the same height
to avoid possibility of severe personal
injury, death or substantial property
damage.
2. Place roof penetrations to obtain minimum clear-
ance of 12 inches between edge of air intake elbow
and adjacent vent pipe of another boiler for U. S.
installations (see Figure 50, page 42). For Canadian
installations, provide clearances required by CSA
B149.1 or B149.2 Installation Code.
3. The air inlet of a GWC boiler is part of a direct vent
connection. It is not classified as a forced air intake
with regard to spacing from adjacent boiler vents.

Prepare roof penetrations

1. Air pipe penetration:
a. Cut a hole for the air pipe. Size the air pipe
hole as close as desired to the air pipe outside
diameter.
2. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combus-
tible or noncombustible construction, size the
vent pipe hole at least 0.4" larger than the vent
pipe diameter (4" hole for 3" PVC).
b. Insert a galvanized metal thimble in the vent
pipe hole.
Part number 550-142-786/0712
-
fired water boiler
Vertical with separate pipes
Figure 49
(Figure 50)
— Boiler Manual
Separate pipes vertical termination
Step 1 Read and follow all instructions in this manual. DO NOT proceed
with vent/air installation until you have read page 29
through page 35.
Step 2 Install the boiler in a location that allows proper routing of all vent
and air piping to the selected sidewall location.
Step 3 Make sure the selected vertical termination location complies with
Figure 41, page 35. (Multiple boiler terminations must also comply
with Figure 50, page 42.)
Step 4 Use only the vent materials listed in Figure 40, page 33. Provide pipe
adapters where required. Vent piping and air piping lengths must not
exceed the values shown in Figure 39, page 32.
Step 5 Prepare the vertical penetrations and secure penetration components
as instructed in this section. See "Prepare roof penetrations" on page 41
and "Termination and fittings" on page 42.
Step 6 The air piping must terminate in a 180-degree return bend or down-
turned elbow as shown above. The vent piping must terminate in a
coupling pointed upward as shown above. Vent and air termina-
tions must be fitted with bird screens as shown. Two bird screens are
supplied with the boiler.
Step 7 Install vent and air piping between the boiler and the vertical termina-
tions. Slope horizontal piping downward toward the boiler at least 1/4
inch per foot. Install pipe supports every 5 feet on both the horizontal
and vertical runs. Install a hanger support within 6 inches of any upturn
in the piping. See page 46 for general guidelines.
Step 8 Insert the vent and air piping through the vertical penetrations and
secure the termination fittings.
Step 9 Maintain clearances shown above. Vent and air terminations must
be fitted with a bird screen as shown. See Figure 93, page 88 for part
numbers.
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