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Part number 550-142-054/0411
37
GV90+ gas-fired water boiler — Boiler Manual
DIRECT VENT — Sidewall with W-M vent/air plate
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 termination such that the total air piping
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 vent/air cap must be installed as shown in
Figure 46, page 38.
2. The termination must comply with clearances and
limitations shown in Figure 41, page 35.
3. Locate the termination so it is not likely to be dam-
aged by foreign objects, such as stones or balls, or
subject to buildup of leaves or sediment.
Multiple vent/air terminations
1. When terminating multiple GV90+ boilers, ter-
minate each vent/air connection as described in
this manual.
All vent pipes and air inlets must ter-
minate at the same height to avoid pos-
sibility of severe personal injury, death or
substantial property damage.
2. Place wall penetrations to obtain minimum clear-
ance as shown in Figure 44 for U. S. installations.
For Canadian installations, provide clearances re-
quired by CSA B149.1 or B149.2 Installation Code.
3. The air inlet of a GV90+ 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 mani-
folded as shown in Figure 37, page 31.
Figure 43 INSTALLATION — W-M sidewall vent/air plate
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 com-
plies with Figure 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 adapters where required.
Step 5 Vent piping and air piping lengths must not exceed the
values shown in Figure 39, page 32.
Step 6 Prepare the sidewall penetrations and secure the sidewall
plates as instructed in this section. See “Install Weil-McLain
vent/air cap” on page 38.
Step 7 The Weil-McLain plate termination must be installed before
piping from the boiler to the termination.
Step 8 Install vent and air piping between the boiler and the vent/
air termination plate. Slope horizontal piping downward
toward the boiler at least 1/4 inch per foot. See page 48 for
general guidelines.
Step 9 Install pipe supports every 5 feet on both the horizontal and
vertical runs.
Step 10 Install a hanger support within 6 inches of any upturn in
the piping.
The Weil-McLain vent/air termination
cap can be used to terminate the vent
pipe for multiple boiler applications
using the manifolded combustion
air option. The vents must be lo-
cated following the restrictions in Fig-
ure 41, page 35 and Figure 38, page 31.