Direct Vent - Vertical With Separate Pipes - Weil-McLain Aqua Balance WMB-155 Manual

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TM
AquaBalance
12 DIRECT VENT — Vertical with separate pipes
Allowable vent/air pipe materials
& lengths
Use only the vent materials and kits listed
in Figure 22, page 19. Provide pipe adapt-
ers if specified.
1. Locate the terminations such that the total air piping
and vent piping from the boiler to the termination
will not exceed the maximum length given in Fig-
ure 21, page 18.
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 connections).
Install a locking collar at every joint.
For AL29-4C vent pipe applications,
comply with any additional requirements
in the vent system manufacturer's instruc-
tions. Provide a AL29-4C starter piece
from the AL29-4C manufacturer to the
transition piece at the boiler vent con-
nection. The air piping must be PVC or
CPVC. Provide a 3" PVC transition piece
at the boiler air connection if using 2" air
piping.
Determine termination location
1. The air and vent terminations must be installed as
shown in Figure 31.
2. The terminations must comply with clearances and
limitations shown in Figure 23, page 21.
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.
Multiple vent/air terminations
1. When terminating multiple boilers, terminate each
vent/air connection as described in this manual.
Terminate all vent pipes at the same height
and all air pipes at the same height to
avoid possibility of severe personal injury,
death or substantial property damage.
2. Place roof penetrations to obtain minimum clear-
ance of 12 inches between edge of air intake elbow
and adjacent vent pipe of another boiler for U. S.
installations (see Figure 34, page 30).
3. For Canadian installations, provide clearances re-
quired 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 con-
nection. 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 31
Separate pipes vertical termination
Terminate vent and air pipes such that:
a. AIR INTAKE IS AT LEAST 12 inches below vent outlet
b. AIR INTAKE IS NO FURTHER than 12 inches away center to center
c. AIR INTAKE IS AT LEAST 12 inches above roof or snow line,
keep vents/air intake area clear of accumulating snow.
d. Vent and air terminations are fitted with bird screens
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.
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 terminations must also comply
with Figure 32, page 28.)
Step 4 Use only the vent materials listed in Figure 22, page 19. Provide pipe
adapters where required. Vent piping and air piping lengths must not
exceed the values shown in Figure 21, page 18.
Step 5 Prepare the vertical penetrations and secure penetration components as
instructed in this section. See "Prepare roof penetrations" on page 28
and "Termination and fittings" on page 28.
Step 6 The air piping must terminate in a 180-degree return bend or down-
turned elbow as shown above. The vent piping must terminate in a
coupling pointed upward as shown above.
Step 7 Install vent and air piping between the boiler and the vertical termina-
tions. Slope horizontal piping downward toward the boiler at least 1/4
inch per foot. 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. See page 32 for general guidelines. Also comply with vent
pipe manufacturer's instructions.
Step 8 Insert the vent and air piping through the vertical penetrations and
secure the termination fittings.
Step 9 Maintain clearances shown above. Vent and air terminations must be
fitted with a bird screen as shown.
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.
See notices at left.
See notices at left.
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