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Part number 550-142-054/0411
41
GV90+ gas-fired water boiler — Boiler Manual
DIRECT VENT — Sidewall 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
1. The concentric termination kit must be installed
as shown in Figure 50, page 41.
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, install
each concentric termination 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
clearance as shown in Figure 51, page 42 for U. S.
installations. For Canadian installations, provide
clearances required by CSA B149.1 or B149.2 In-
stallation 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.
Figure 50 INSTALLATION SEQUENCE — Concentric horizontal
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 concentric
terminations must also comply with Figure 51, page 42.)
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 sidewall penetration — assemble the concentric
termination kit and secure the cover plates as instructed in
this section. Provide the supports indicated and mount the
termination assembly. See “Install termination — concentric
pipes” on page 42.
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.