Specifications

Part number 550-142-120/0113
WM97+ gas-fired water boiler — Boiler Manual
– 20 –
Venting & air — general (cont.)
Figure 17 WM97+ 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. NOT SHOWN below, but also approved, are the polypropylene piping and terminations listed in Figure 18, page 21.
For these applications, use ONLY the manufacturers’ parts listed and follow all instructions provided by the pipe manufacturer.
WM97+ Model
Maximum vent and air pipe length = 100 feet for all applications
(Minimum length for all applications is 2 feet)
(All applications include allowance for the termination fittings plus one elbow in air piping and one elbow in vent piping)
USE SWEEP
ELBOWS
ONLY
See Figure18,page21 for material specications | See Figure123,page119 for part/kit numbers
Vent and air pipe sizes:
Maximum vent lengths apply for either 2” or 3” vent and air pipe.
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137,page133 for derate amounts.
SIDEWALL termination VERTICAL termination
3” Weil-McLain PVC
vent/air cap [Note 1]
Separate pipes
[Note 1]
PVC or PP Concentric
[Note 1]
Separate pipes
[Note 1]
PVC or PP Concentric
[Note 1]
See page 25 See page 27 See page 29 See page 31 See page 33
Size,
inches
Materials
Fig. 18, page 21
Size,
inches
Materials
Fig. 18, page 21
Size,
inches
Materials
Fig. 18, page 21
Size,
inches
Materials
Fig. 18, page 21
Size,
inches
Materials
Fig. 18, page 21
70
2
PVC/PVC-DWV
CPVC, PP, SS
2
PVC/PVC-DWV
CPVC, PP, SS
2
PVC/PVC-DWV
CPVC, PP, SS
2
PVC/PVC-DWV
CPVC, PP, SS
2
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
110
2
CPVC, PP or SS
ONLY
2
CPVC, PP or SS
ONLY
2
CPVC, PP or SS
ONLY
2
CPVC, PP or SS
ONLY
2
CPVC, PP or SS
ONLY
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
155
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, SS, **
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, SS, **
** 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 — If piping contains more than 1 elbow in air or vent piping, other than termination fittings
Note 1:
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-
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.