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WM97+
-
gas
fired water boiler
Venting & air — general
WM97+ venting and air piping — DIRECT VENT ONLY — OPTIONS and PIPING LIMITS
Figure 17
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.
Maximum vent and air pipe length = 100 feet for all applications
(All applications include allowance for the termination fittings plus one elbow in air piping and one elbow in vent piping)
See Figure 18, page 21 for material specifications | See Figure 119, page 117 for part/kit numbers
If using 2" pipe, provide 3"x2" reducers at boiler connections and at Weil-McLain vent/air cap or at concentric terminations.
Boilers will derate as vent/air pipe length increases — see rating data on Figure 132, page 129 for derate amounts.
3" Weil-McLain PVC
vent/air cap [Note 1]
See page 25
Size,
Materials
inches
Fig. 18, page 21
PVC/PVC-DWV
2
CPVC, PP, SS
70
PVC/PVC-DWV
3
CPVC, PP, SS
CPVC, PP or SS
2
ONLY
110
PVC/PVC-DWV
3
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
155
** Model 155 may be concentric sidewall vented (NOT vertical concentric vented) using Centrotherm polypropylene pipe (Eco
Systems InnoFlue® Single-wall) ONLY if using Centrotherm stainless steel concentric termination kit, part number ICWS3513.
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 polypropylene or stainless pipe, provide adapters to for 3" boiler connections and 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 compli-
Note 1:
ance 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.
– 20 –
below, but also approved, are the polypropylene piping and terminations listed in Figure 18, page 21.
NOT SHOWN
(Minimum length for all applications is 2 feet)
Vent and air pipe sizes:
Maximum vent lengths apply for either 2" or 3" vent and air pipe.
SIDEWALL termination
Separate pipes
[Note 1]
See page 27
Size,
Materials
inches
Fig. 18, page 21
PVC/PVC-DWV
2
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
CPVC, PP or SS
2
ONLY
PVC/PVC-DWV
3
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
— Boiler Manual
(cont.)
PVC or PP Concentric
[Note 1]
See page 29
Size,
Materials
Size,
inches
Fig. 18, page 21
inches
PVC/PVC-DWV
2
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, PP, SS
CPVC, PP or SS
2
ONLY
PVC/PVC-DWV
3
CPVC, PP, SS
PVC/PVC-DWV
3
CPVC, SS, **
If piping contains more than 1 elbow in air or vent piping, other than termination fittings
USE SWEEP
ELBOWS
VERTICAL termination
Separate pipes
PVC or PP Concentric
[Note 1]
See page 31
Materials
Size,
Fig. 18, page 21
inches
PVC/PVC-DWV
2
2
CPVC, PP, SS
PVC/PVC-DWV
3
3
CPVC, PP, SS
CPVC, PP or SS
2
2
ONLY
PVC/PVC-DWV
3
3
CPVC, PP, SS
PVC/PVC-DWV
3
3
CPVC, PP, SS
Part number 550-142-085/0712
ONLY
[Note 1]
See page 33
Materials
Fig. 18, page 21
PVC/PVC-DWV
CPVC, PP, SS
PVC/PVC-DWV
CPVC, PP, SS
CPVC, PP or SS
ONLY
PVC/PVC-DWV
CPVC, PP, SS
PVC/PVC-DWV
CPVC, SS, **
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