Install Instructions (Venting)

Part number 550-100-103/1110
A–19
GAS-FIRED WATER BOILER — Manual addendum — Venting
DIRECT EXHAUST venting — general
Vent and air piping materials
See 1. Figure 5, page A-7 for approved vent and air piping materials,
for both direct exhaust and direct vent.
Use the same vent or air piping material through-
out.
— Do not connect different types of piping to-
gether.
Vent piping
Boiler flue gases must be piped from the boiler to outside, following 1.
the instructions in this manual, 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 the associated instructions in the following
pages.
Each Ultra boiler requires a separate vent. 2. DO NOT common
vent.
Combustion air openings for direct exhaust
Provide combustion air openings to boiler room
and building.
Combustion and ventilation air for direct
exhaust boilers is provided from the boiler room. Follow
all instructions in the Boiler manual and this addendum
plus all applicable codes, providing combustion air open-
ings as specified. Failure to comply could result in severe
personal injury, death or substantial property damage.
Combustion air must be supplied through openings into the boiler 1.
room, following the instructions in this manual, and compliant
with all applicable codes. Read the warning in Figure 1, page A-2,
and ensure the air and boiler room will not contain contaminated
air.
Where the Ultra boiler shares a space with other appliances, the 2.
combustion air openings must be sized to handle the combined
requirements of all appliances in the space.
SIDEWALL direct exhaust option
Read and follow instructions in Boiler manual, including page 61 1.
for Massachusetts installations when applicable.
Read and follow instructions in Venting addendum 2. page A-2
through page A-7.
Then go to Venting addendum 3. page A-22.
VERTICAL direct exhaust option
Read and follow instructions in Boiler manual, including page 61 1.
for Massachusetts installations when applicable.
Read and follow instructions in Venting addendum 2. page A-2
through page A-7.
Then go to Venting addendum 3. page A-25.
SIDEWALL
DIRECT EXHAUST
VERTICAL
DIRECT EXHAUST
Every vent pipe requires a bird screen at its termi-
nation
. Bird screens are not supplied with the Ultra
boiler. Purchase separately from Weil-McLain.