Direct Vent - Sidewall With Sepa- Rate Pipes - Williamson-Thermoflo GWC-070 Manual

GWC -
gas fired water boiler
DIRECT VENT —
Allowable vent/air pipe materials &
lengths
Use only the vent materials and kits
listed in Figure 40, page 33. Provide
pipe adapters if specified.
1. Locate the termination such that the total air
piping and vent piping from the boiler to the
termination will not exceed the maximum
length given in Figure 39, page 32.
Determine termination location
1. The air and vent terminations must be in-
stalled as shown in Figure 43, page 37 and
Figure 45, page 38.
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.
Do not exceed the maximum lengths
of the outside vent piping shown in
Figure 43, page 37. Excessive length
exposed to the outside could cause
freezing of condensate in the vent
pipe, resulting in potential boiler
shutdown. In extremely cold cli-
mates, install an insulated chase
around the vent piping, particu-
larly when using longer lengths. The
chase must allow for inspection of
the vent pipe, and insulation must
be protected from water.
Multiple vent/air terminations
1. When terminating multiple GWC boilers, ter-
minate each vent/air connection as described
in this manual.
All vent pipes and air inlets must
terminate at the same height to
avoid possibility of severe personal
injury, death or substantial property
damage.
2. Place wall penetrations to obtain minimum
clearances shown in Figure 44, page 38 for
U. S. installations. 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.
4. Combustion air (NOT vent piping) can be
manifolded as shown in Figure 37, page 31.
Part number 550-142-056/0411
— Boiler Manual
Sidewall with separate pipes
Figure 43
INSTALLATION SEQUENCE
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 sidewall termination location complies with Fig-
ure 41, page 35. (Multiple boiler sidewall plates must also comply with
Figure 44, page 38.)
Step 4 Use only the vent materials listed in Figure 40, page 33. Provide pipe adapt-
ers where required. Vent piping and air piping lengths must not exceed the
values shown in Figure 39, page 32.
this installation requires two (2) W-T sidewall termination plates and
a bird screen for air and vent termination fittings, unless using an
AL29-4C vent termination fitting with integral screen
two bird screens are supplied with the boiler for use with 3" PVC piping.
Step 5 Prepare the sidewall penetrations and secure the sidewall plates as instructed
in this section. See "Prepare wall penetrations" on page 38.
Step 6 The air piping must terminate in a down-turned elbow as shown above.
The vent piping must terminate in an elbow pointed outward or away
from the air inlet as shown above. See illustration above.
Step 7 Install vent and air piping between the boiler and the sidewall openings.
Slope horizontal piping downward toward the boiler at least 1/4 inch per
foot. See page 46 for general guidelines.
Step 8 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.
Step 9 Attach the vent termination exterior piping: Use either of the configura-
tions shown above, as needed to ensure clearance above grade or snow line.
Step 10 The vent and air pipes may run up as high as 4 feet with no enclosure.
The vent and air pipes must be secured with braces, and all clearances and
lengths must be maintained. Space braces no further than 24 inches apart.
Step 11 External venting greater than 4 feet requires an insulated enclosure around
the vent and air pipes. The vent and air terminations must exit through
the enclosure as shown in the illustration above, maintaining all required
clearances.
— Separate pipes sidewall
In addition to the vent materials,
. Two plates and
37