11
Part Number 550-142-785/0812
GWI
Series 2
Gas-Fired Water Boilers –
Boiler Manual
Direct exhaust venting
continued
1. Do not mix types or manufacturers of vent materials.
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.
2. Clean all joints before sealing. See vent manufacturer’s in
-
structions for cleaning and sealing joints. Use their specified
sealant. Do not use screws.
3. Install vent pipe with seams on top of vent horizontal runs.
Follow requirements on
page 10
for vent termination location.
4. Maintain minimum 2” clearance from combustible materials
to vent pipe.
5. Vertical venting — See Figure 6
. Follow vent manufacturer’s
instructions for venting through roof.
• Vent pipe must extend through roof flashing, jacket or
thimble.
• Vent may pass through floor, inside wall or concealed
space when installed according to vent manufacturer’s
instructions.
Sidewall venting — See Figures 7 and 8. Vent must terminate
at least one foot above anticipated snowline. Vent must be
terminated only with:
• Elbow with integral screen.
• Elbow and termination coupling with screen (not available
for StaR-34).
6. Do not seal vent pipe (slip connector for Saf-T Vent) to inside
or outside plate.
7. If passing through noncombustible wall, provide hole diam
-
eter large enough to insert the vent pipe (slip connector for
Saf-T Vent).
8. Install horizontal drain tee as close as possible to boiler, in
first horizontal run. See Figure 7.
9. Do not exceed the maximum vent system length given in
Table 4, page 9.
Condensate drain line — use only silicone tubing
rated for at least 400 °F for the first 18” of conden
-
sate drain line, then other non-metallic tubing may
be used. Using any other material could cause flue
gas leakage, potentially resulting in severe personal
injury, death or substantial property damage.
On some installations, the condensate drain fitting
may be omitted, provided:
• Vent manufacturer shows this option in their instruc
-
tions.
• Vent is sloped toward termination as shown in dotted
lines in Figure 7.
• The vent is installed per boiler manufacturer’s and
vent manufacturer’s instructions.
Condensate drippage from such vents may accumulate on the
ground below. Consider traffic in the area to avoid hazard due to
ice accumulation.
Installing direct exhaust vent and termination
3 Vent installation
continued
Figure 6
Vertical direct exhaust installation
Figure 7
Direct exhaust through side wall
