Williamson Series 2 Manual page 9

3 Vent installation
Direct exhaust venting
1. Select a vent pipe manufacturer from separate GWI Vent
Component Supplement and obtain all vent components
needed, based on boiler location and venting method.
2. You must use the vent starter (see below) made by the vent pipe
manufacturer. See GWI Vent Component Supplement for
part number of each component, listed by vent manufacturer.
Use only the vent starter of the same manufacturer
as the vent components. Do not mix components
from different systems. The vent system could fail,
causing flue gas spillage, resulting in severe per-
sonal injury or death.
3. Follow all applicable national, state, local or provincial codes
when venting the GWI boiler.
4. Connect vent starter to blower housing outlet as shown below.
a. Do not mix components from different vent manufacturers.
b. Maintain minimum 2" clearance from combustible materials
to vent pipe.
c. Seal with sealant specified by vent pipe manufacturer,
" bead (not required for FasNSeal™).
using 3 /
8
d. Tighten strap at band clamp screw until strap is snug
around blower housing.
Part Number 550-142-785/0812
GWI Series 2 Gas-Fired Water Boilers – Boiler Manual
continued
Obtain vent system components
1. The following special gas vent systems comply with UL-1738
and ULC-S636 standards and are certified by CSA as the only
systems suitable for use with GWI boilers (all 3" diameter):
• Heat-Fab, Inc. Saf-T Vent
• Flex-L International, Inc. StaR-34
• Z-Flex
• ProTech Systems FasNSeal™
2. Select vertical or sidewall venting depending on job require-
ments.
3. Refer to Table 4 for maximum vent run lengths and number of
elbows. Do not exceed data in Table 4.
4. Select vent components from separate GWI Vent Component
Supplement. All components, including the vent starter, must
be of the same vent manufacturer. Do not mix components.
Table 4 Maximum vent length
Max.vent length
(feet)
GWI-047 to GWI-158
GWI-190
Notes:
1. Do not include termination fitting when counting total number of elbows.
2. One (1) 90° elbow is equivalent to two (2) 45° elbows.
®
® , Inc. Z-Vent II
Use only the vent starter of the same manufacturer
as the vent components. Do not mix components
from different systems. The vent system could fail,
causing flue gas spillage, resulting in severe per-
sonal injury or death.
Total number of 90° elbows
(Notes 1 & 2)
1 2 3
55 48 41
35 28 21
4 5 6
34 27 20
14 7 --
9