Direct Vent - Vertical Concentric - Weil-McLain Aqua Balance WMB-155 Manual

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AquaBalance
13 DIRECT VENT — Vertical concentric
Allowable vent/air pipe materials &
lengths
1. The concentric termination kit must be purchased sepa-
rately.
Use only the vent materials and kits listed in Fig-
ure 22, page 19. Provide pipe adapters if specified.
2. 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 21, page 18.
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.
For polypropylene applications, comply with
any additional requirements in the vent system
manufacturer's instructions. (Do Not use 3" PVC
transition pieces at the boiler vent and air con-
nections)and at the termination if using a 3" PVC
concentric vent kit. Install a locking collar at every
joint.
For AL29-4C vent pipe applications, comply with
any additional requirements in the vent system
manufacturer's instructions. Provide a AL29-4C
starter piece from the AL29-4C manufacturer to
the transition at the boiler vent connection. Air
pipe must be PVC or CPVC. Provide a 3" PVC
transition at the boiler air connection if using 2"
air pipe. Provide transition pieces to PVC at the
vent and air pipe termination connections.
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 35, page 30.
2. The termination must comply with the clearances and
limitations shown in Figure 23, page 21.
3. Locate the termination so it is not likely to be damaged by
foreign objects, such as stones or balls, or subject to buildup
of leaves or sediment.
4. For Canadian installations, provide clearances required by
CSA B149.1 or B149.2 Installation Code and a ULC S636
compliant vent kit.
Multiple vent/air terminations
1. When terminating multiple 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 clearance of
12 inches between the edges of adjacent vent pipes of other
boilers for U. S. installations (see Figure 34, page 30).
3. For Canadian installations, provide clearances required by
CSA B149.1 or B149.2 Installation Code and a ULC S636
compliant vent kit.
4. The air inlet of a 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.
Part number 550-100-305/0118
M -
ALL OUNT GAS FIRED WATER BOILER
—
Boiler Manual
Figure 33
INSTALLATION SEQUENCE
Step 1 Read and follow all instructions in this manual. DO NOT
proceed with vent/air installation until you have
read page 17 through page 20.
notices at left.
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 23, page 21. (Multiple boiler concentric termina-
tions must also comply with Figure 34, page 30.)
Step 4 Use only the vent materials listed in Figure 22, page 19. Provide
pipe adapters where required.
Step 5 Vent piping and air piping lengths must not exceed the values
shown in Figure 21, page 18.
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 pen-
etrations" on page 30 and "Mount concentric termination"
on page 30.
Step 8 Install vent and air piping between the boiler and the concen-
tric vent/air termination. Slope horizontal piping downward
toward the boiler at least 1/4 inch per foot. See page 32 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.
USE SWEEP ELBOWS FOR ALL VENT AND
AIR PIPING — DO NOT use short radius elbows
for vent or air piping. Boiler performance could be
affected.
— Concentric vertical
See
See notices at left.
See notices at left.
See notices at left.
29