Install Instructions

Venting & air — general (continued)
ALL vent and air pipes require a BIRD SCREEN at each termination. Most kits do not include
the bird screens. Purchase bird screens separately from Weil-McLain or vent kit supplier if
not included. [Note — bird screening is integral to the 3” and 4” PVC Weil-McLain sidewall
vent cap, purchased separately. No additional screening is required.]
&IGURE Vent and air piping materials — Use only the materials listed below, ensuring that all materials meet
local codes (see Figure 108, page 115 for part/kit numbers)
Part number 550-100-131/0715
– 19 –
™
GAS-FIRED WATER BOILER — Boiler Manual
)TEM -ATERIAL
3TANDARDSFORINSTALLATIONSIN
5NITED3TATES #ANADA(Note 2)
0LASTICPIPINGMATERIALS 6ENTORAIRPIPING 6ENTPIPING !IRPIPING
6ENTORAIRPIPE

lTTINGS
PVC schedule 40 (Note 1) ANSI/ASTM D1785 ULC S636
PVC, PVC-DWV,
CPVC or
polypropylene
PVC-DWV schedule 40 (Note 1) ANSI/ASTM D2665 N/A
CPVC schedule 40 (Note 1) ANSI/ASTM F441 ULC S636
06#!"3PIPE
CEMENTPRIMER
PVC (Note 1) ANSI/ASTM D2564/F656 ULC S636
Use only cement
and primer
suitable for piping
material used
CPVC (Note 1) ANSI/ASTM F493 ULC S636
CPVC to PVC transition
Use only cement and primer
suitable for piping material used
ULC S636
0OLYPROPYLENE
VENTPIPElTTINGS
TERMINATIONSAND
CEMENT
3IMPSON$URAVENTObtain all materials from M&G
Simpson-Duravent
#ENTROTHERM%CO3YSTEMS)NNO&LUE®3INGLEWALL
Obtain all materials from Centrotherm
(Note: See page 115 for correct appliance adapters to be
used.)
See manufacturer’s literature for
detailed information
MUST USE LOCKING
COLLAR ON EVERY JOINT
ULC S636
PVC, PVC-DWV,
CPVC or
polypropylene
!,#STAINLESSSTEELPIPINGMATERIALS
6ENTPIPE
!,#
STAINLESS
STEEL
Heat Fab, Inc. — Saf-T-Vent
®
Z-Flex, Inc. — Z-Vent
Dura-Vent — FasNSeal™
Metal-Fab, Inc. — CORR/GUARD
Certified for Category IV and
direct vent appliance venting
Certified for Category IV and direct vent
appliance venting
7EIL-C,AINSTAINLESSSTEELBIRDSCREENSvORv(purchase separately) — see Figure 108, page 115 for part numbers
Note 1: Weil-McLain concentric vent kits are made from PVC
pipe and fittings.
Note 2: System 636 PVC concentric terminations utilize PVC
pipe/fittings certified to ULC S636.
If ULC S636 compliance is required, use only System
636 pipe, fittings and cement.
DO NOT mix piping from different pipe manufacturers
unless using adapters specifically designed for the
purpose by the manufacturer.
Every joint on polypropylene vent piping must
include a locking collar.
DO NOT use cellular core PVC (ASTM F891), cellular
core CPVC, or Radel
®
(polyphenolsulfone) in venting
systems.
DO NOT cover non-metallic vent pipe and fittings
with thermal insulation.
ADAPTERS — AL29-4C piping — Install a PVC-to-stainless
adapter supplied by the AL29-4C stainless pipe manu-
facturer at the 4” PVC boiler vent connection and at the
termination (if using Weil-McLain plate or concentric PVC
termination).
ADAPTERS — Polypropylene piping — Provide adapters
from polypropylene pipe to the 4” PVC connections at
the boiler and at terminations, if required (Weil-McLain
sidewall plate, for example).
ADAPTERS — If using 3” piping, where approved for the
application, provide adapters for the 4” PVC boiler con-
nections and at the terminations, if required (Weil-McLain
sidewall plate, for example).
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.