Install Instructions

Venting & air — general (continued)
Figure 22 Evergreen
®
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 23, page 24 .
For these applications, use ONLY the manufacturers’ parts listed and follow all instructions provided by the pipe manufacturer.
Part number 550-100-191/0917
23
®
gas-fired water boiler — 70/110/155 Boiler Manual
Evergreen
®
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 fi ttings plus one elbow in air piping and one elbow in vent piping).
USE SWEEP
ELBOWS
ONLY
See Figure23,page24 for material speci cations | See Figure110,page127 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"x 2" tapered 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123,page139 for derate amounts.
SIDEWALL termination VERTICAL termination
Separate pipes
[Note 1]
PVC or PP Concentric
[Note 1]
3” Weil-McLain PVC
vent/air cap [Note 1]
Separate pipes
[Note 1]
PVC or PP Concentric
[Note 1]
See page 28 See page 30 See page 32 See page 32 See page 36
Size,
inches
Materials
Fig. 23, page 24
Size,
inches
Materials
Fig. 23, page 24
Size,
inches
Materials
Fig. 23, page 24
Size,
inches
Materials
Fig. 23, page 24
Size,
inches
Materials
Fig. 23, page 24
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
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC Concentric
only
––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, SS, PP**
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, PP, SS
3
PVC/PVC-DWV
CPVC, SS,
** Model 155 may be concentric sidewall 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. When
transitioning to 3" to 2", use tapered reducer with 3" PVC nipple (L  6"). Do not use 3" to 2" bushing.
Bushings will not seal in boiler adapters.
Equivalent feet for elbows (USE SWEEP ELBOWS ONLY) — deduct from max. equivalent length of piping (does not apply to termination fi ttings).
• 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 fi ttings.
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, fi ttings and cement (ANSI/ASTM D1785) except if ULC S636
compliance is required. For ULC S636 compliance, all pipe, fi ttings 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.
Note 2: Use only Weil-McLain approved termination kits listed in Figure 110, page 127