Part number
550-100-268/1220
3
CONDENSING
GAS
BOILER
—
V
ENT
A
DDENDUM
Direct Exhaust
(Category II Only) Venting – general
Evergreen Boilers must be vented
and supplied with combustion and
ventilation air using piping and
methods described in this adden-
dum
.
Inspect fi nished vent and air piping thor-
oughly to ensure all are water-tight and
comply with the instructions provided
and with all requirements of applicable
codes.
Failure to provide a properly-installed
vent and air system will cause severe
personal injury or death.
If the vent/air piping configurations
covered in the
Evergreen
boiler manual
and this addendum cannot be applied
for a particular installation, contact Weil-
McLain for assistance. Other confi gura-
tions may be available.
Installations must comply with local
requirements and with the National
Fuel Gas Code, ANSI Z223.1 for U.S.
installations or CSA B149.1 or B149.2 for
Canadian installations.
Use only the materials listed in the Boiler
manual for vent and air pipe and fi ttings.
Failure to comply could result in severe
personal injury, death or substantial
property damage.
If used, a masonry chimney can
ONLY be used as a PIPE CHASE for
vent pipe
— The vent piping must be in-
stalled as instructed in this manual and all
joints must be sealed. The chimney must
be used only for boilers. NO OTHER
appliance or fi replace can be connected
to the chimney.
The chimney must be straight, with
no offsets, and the vent and air piping
materials must comply with this instruc-
tion manual. The chimney must be fi tted
with a sealed access opening, through
which the interior of the chimney can
be inspected. The chimney (and liner, if
installed) must be inspected at least once
annually to verify condition.
Failure to comply could result in severe
personal injury, death or substantial
property damage.
Vent piping
Boiler fl ue gases must be piped from the boiler to outside, following
the instructions in the Boiler manual and this addendum, and
compliant with all applicable codes.
Combustion and ventilation air openings
(direct exhaust installations)
Combustion and ventilation air are provided from the boiler room
on direct exhaust installations. Follow all instructions in the Boiler
manual and this addendum, plus all applicable codes, to provide
required air openings.
Vent termination options
Vent piping must terminate out through the roof of the building,
using only one of the methods described in the Boiler manual and
this addendum.
Vent pipe diameter
A 6” vent pipe diameter must be used.
Vent pipe minimum length
Direct exhaust — no minimum.
Vent and air piping materials
See the
Evergreen
Boiler Manual for approved vent and air piping
materials, for
direct exhaust
.
Use the same vent or air piping material through-
out.
— Do not connect different types of piping to-
gether.
Install a bird screen in each vent pipe termination (coupling or elbow).
Bird screens are not supplied with the
Evergreen
boiler. Purchase
separately from Weil-McLain.
