Install Instructions (Venting)

Part number 550-100-103/1110
A–3
GAS-FIRED WATER BOILER — Manual addendum — Venting
Venting & air — general (cont.)
Ultra Boilers must be vented and
supplied with combustion and ven-
tilation air using piping and methods
described in this manual
.
Every boiler must have its own vent.
DO NOT common vent with any other
appliance. See page A-2.
Inspect finished vent and air piping
thoroughly to ensure all are airtight 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 cov-
ered in the Ultra boiler manual and this
addendum cannot be applied for a par-
ticular installation, contact Weil-McLain
for assistance. Other configurations may
be available.
Where vent piping is routed through an
unheated space
, apply minimum 1 inch
of foil-faced fiberglass insulation on the
length of the vent pipe in the unheated
space.
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 and this addendum for
vent and air pipe and fittings. See Fig-
ure 5, page A-7. 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 and air pipes
— The vent and air
piping must be installed as instructed in
this manual and all joints must be sealed.
The chimney must be used only for Ultra
boilers. NO OTHER appliance or fire-
place can be connected to the chimney.
The chimney must be straight, with no
offsets, and the vent and air piping ma-
terials must comply with this instruction
manual. The chimney must be fitted
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 flue gases must be piped from the boiler to outside, follow-1.
ing the instructions in the Boiler manual and this addendum, and
compliant with all applicable codes. The vent pipe must terminate
either through the sidewall or through the roof, located with the
correct separation from the air termination.
See 2. Figure 2, page A-4 for location of instructions for the vent/
air system being used.
Each Ultra boiler requires a separate vent. 3.
Do not common
vent
.
Combustion air piping
(direct vent installations)
For direct venting, combustion air must be piped from outside to 1.
the boiler, following the instructions in the Boiler manual and this
addendum, and compliant with all applicable codes. Read the
warning in Figure 1, page A-2, and ensure the air intake
will not be likely to draw in contaminated air.
Combustion air can be piped individually for each boiler, or 2.
it can be manifolded as shown in Boiler manual, page 55. Air
piping must always terminate on the same side (or roof ) of the
building as the vent, except for direct vent: vertical vent/sidewall
air installations.
Combustion and ventilation air openings
(direct exhaust installations)
Combustion and ventilation air are provided from the boiler room 1.
on direct exhaust installations. Follow all instructions in the Boiler
manual and this addendum, plus all applicable codes, to provide
required air openings.
Vent and air pipe termination options
Vent and air piping must terminate out the sidewall or through 1.
the roof of the building, using only one of the methods described
in the Boiler manual and this addendum.
See 2. Figure 2, page A-4 for options.
Vent and air pipe diameters
Vent and air pipe diameters can be as specified in 1. Fig-
ure 2, page A-4.
Vent and air pipe maximum length
Do not exceed vent and air piping MAXIMUM lengths given in 1.
Figure 2, page A-4.
Vent and air pipe minimum length
Direct vent — vent pipe and air pipe must each be 1. at least 2 feet
long
, with 2 elbows if sidewall venting or 1 elbow if vertical vent-
ing.
Direct exhaust — no minimum.2.
REPLACES MANUAL PAGE 17