Weil-McLain Aqua Balance WMB-155 Manual page 18

W
TM
AquaBalance
6 Venting/air piping — general
Figure 21
Venting and air piping — DIRECT VENT ONLY — OPTIONS and PIPING LIMITS
The table below lists the acceptable vent/air pipe terminations described in this manual. Follow all instructions provided to install the
vent/air system.
For these applications, use ONLY the manufacturers' parts listed and follow all instructions provided by the pipe manufacturer.
(Minimum length for all applications is 2 feet equivalent plus termination)
(All applications include allowance for the termination fittings plus one elbow in air piping and one elbow in vent piping)
See Figure 22, page 19 for material specifications | See Figure 159, page 117 for part/kit numbers
Boilers will derate as vent/air pipe length increases —
Separate pipes
[Note 1]
See page 23
Size,
inches Fig. 21, page 19
PVC/PVC-DWV
2
WMB-80
PVC/PVC-DWV
3
PVC/PVC-DWV
2
WMB-120
PVC/PVC-DWV
3
PVC/PVC-DWV
WMB-155 3
All elbows in vent and air piping must be sweep elbows ONLY. DO NOT use short-radius elbows.
Equivalent feet for elbows (USE SWEEP ELBOWS ONLY) — deduct from max equivalent length of piping (does not apply to termination fittings).
• 7 feet per for each additional 90° sweep elbow or 45° elbow —
Material abbreviations: PP = polypropylene, SS = AL29-4C stainless steel.
If using stainless pipe, provide adapters for terminations, if required.
IPEX 3" PVC concentric vent kits can be used with standard PVC pipe, fittings and cement (ANSI/ASTM D1785) except if ULC S636
Note 1:
compliance is required. For ULC S636 compliance, all pipe, fittings and cement must be IPEX System 636. If using IPEX kits, use only
IPEX product code 196006 for 3" venting.
Contact Weil-McLain for ordering information and availability of Weil-McLain venting kits.
18
M -
ALL OUNT GAS FIRED WATER BOILER
below, but also approved, are the polypropylene piping and terminations listed in Figure 22, page 19.
NOT SHOWN
Maximum vent and air pipe length =
100 feet for all applications
Maximum vent lengths apply for 3" vent and air pipe.
SIDEWALL termination
PVC or PP Concentric
[Note 1]
See page 25
Materials Size,
inches Fig. 21, page 19
PVC/PVC-DWV
2
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
PVC/PVC-DWV
2
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
—
continued
Vent and air pipe sizes:
*
see rating data on Figure 173, page 131 for derate amounts.
Separate pipes
[Note 1]
See page 27
Materials Size,
inches Fig. 21, page 19
PVC/PVC-DWV
2
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
PVC/PVC-DWV
2
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
If piping contains more than 1 elbow in air or vent piping, other than termination fittings.
Boiler Manual
VERTICAL termination
PVC or PP Concentric
[Note 1]
See page 29
Materials Size,
inches
2
CPVC, PP, SS
3
CPVC, PP, SS
2
CPVC, PP, SS
3
CPVC, PP, SS
PVC/PVC-DWV CPVC,
3
CPVC, PP, SS
Part number 550-100-305/0118
USE
SWEEP
ELBOWS
ONLY
Materials
Fig. 21, page 19
PVC/PVC-DWV
CPVC, PP, SS
PVC/PVC-DWV
CPVC, PP, SS
PVC/PVC-DWV
CPVC, PP, SS
PVC/PVC-DWV
CPVC, PP, SS
PP, SS