Weil-McLain GV90+ - Manual (Page 45)

Part number 550-142-054/0411
45
GV90+
gas
-
fired water boiler
— Boiler Manual
DIRECT VENT —
Vertical with 3” concentric
Allowable vent/air pipe materials &
lengths
1. The 3” concentric termination kit must be pur-
chased separately.
Use only the vent materials and kits listed
in Figure 40, page 33. Provide pipe adapt-
ers if specified.
2. 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.
3. This termination requires a 45-degree elbow that
is not supplied with the termination kit. The
maximum vent/air pipe lengths include allowance
for this elbow.
Determine termination location
Locate the concentric vent/air termination using the
following guidelines:
1. The concentric vent/air assembly must terminate
as shown in Figure 56, page 46.
2. The termination must comply with the 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.
4. For Canadian installations, follow requirements of
CSA B149.1 or B149.2 Installation Code.
Multiple vent/air terminations
1. When terminating multiple GV90+ boilers, install
the concentric vent/air termination assemblies as
described in this manual.
All vent outlets must terminate at the
same height to avoid possibility of severe
personal injury, death or substantial
property damage.
2. Place roof penetrations to obtain minimum of
12 inches between centers of adjacent vent pipe
of another boiler for U. S. installations (see Fig-
ure 56, page 46).
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.
Prepare roof penetrations
1. Roof penetration hole:
a. Cut a 5-inch diameter hole to clear the 4½-inch
termination outside diameter.
b. Insert a galvanized metal thimble in the vent
pipe hole.
2. Follow all local codes for isolation of vent pipe when
passing through floors, ceilings and roofs.
3. Provide flashing and sealing boots sized for the
concentric termination outside diameter.
Figure 55 INSTALLATION SEQUENCE — Concentric vertical
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 com-
plies with Figure 41, page 35. (Multiple boiler concentric
terminations must also comply with Figure 56, page 46.)
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 The concentric termination must be assembled and installed
before piping from the boiler to the termination.
Step 7 Prepare the vertical penetration(s) — assemble the concen-
tric termination kit and secure the penetration components
as instructed in this section. Provide the supports indicated
and mount the termination assembly. See “Prepare roof
penetrations” on page 45 and “Mount concentric termina-
tion” on page 46.
Step 8 Install vent and air piping between the boiler and the
concentric vent/air termination. 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.