Williamson-Thermoflo GWC-070 Manual page 33

GWC -
gas fired water boiler
Venting & air — general
Vent and air piping materials — Use only the materials listed below, ensuring that all materials meet
Figure 40
local codes
Item
Vent or air pipe
&
fittings
PVC & ABS pipe
cement & primer
Vent pipe
AL29-4C
stainless
steel
3" bird screen:
Williamson-
W-T part number 383-500-105WT
Thermoflo
(two supplied with the boiler)
bird screens
Note 1: DO NOT use DWV, CPVC or ABS when using concentric vent termination. Use ONLY PVC schedule 40.
Note 2: IPEX PVC concentric terminations utilize PVC pipe/fittings certified to ULC S636. Where ULC S636 compliance is required, use
only IPEX System 636 pipe, fittings and cement.
AL29-4C vent piping — Install a PVC-to-stainless adapter supplied by the vent pipe manufacturer at the boiler vent connection
and at the termination (when using concentric PVC termination). DO NOT mix piping from different vent pipe manufacturers
unless using adapters specifically designed for the purpose by the manufacturer.
Plastic piping — Do not attempt to connect different types of plastic piping together.
DO NOT use cellular core pipe.
Part number 550-142-056/0411
— Boiler Manual
Material
Plastic piping materials
PVC schedule 40
PVC-DWV (Note 1)
CPVC schedule 40 (Note 1)
ABS-DWV schedule 40 (Note 1)
PVC
CPVC (Note 1)
ABS (Note 1)
AL29-4C piping materials
Heat Fab, Inc. — Saf-T-Vent ®
Z-Flex, Inc. — Z-Vent II
Dura-Vent — FasNSeal™
Metal-Fab, Inc. — CORR/GUARD
Williamson-Thermoflo bird screens (included with boiler)
ALL vent and air pipes require a
screens are supplied with each GWC boiler.
(cont.)
Standards for installations in:
United States
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM F441
ANSI/ASTM D2661
ANSI/ASTM D2564
ANSI/ASTM F493
ANSI/ASTM D2235
Certified for Category IV and direct vent
appliance venting
BIRD SCREEN at each termination
Canada
Plastic vent pipe must be certified to
ULC S636 when required. (Note 2)
Air pipe can be any of those listed at
left if acceptable for local codes.
—
. Two bird
33