Vent Connection; Exterior Vents; Vent Sizing; Vent Connection To Boiler - PEERLESS SERIES 211A Installation, Operation & Maintenance Manual

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all combustion products. If the vent system does not
provide enough draft, combustion products will spill into
the building from the draft hood relief opening. If spillage
of combustion products occurs, check the vent system,
the combustion and ventilation openings and make sure
the boiler room is never under negative pressure.
Failure to provide adequate
venting can result in severe
injury or death.
4. Exterior Vents
a) If the vent is outside, make sure it is insulated
sufficiently to ensure adequate draft.
5. Vent Sizing:
a) Individual vents: Use vent piping the same diameter
as the boiler vent connection. The minimum height
is I0 feet above the bottom of the draft hood (relief
opening). The vent must also extend above the roof
or any obstiructions as outlined in the current edition
of the National Fuel Gas Code, ANSI
Z223.1/NFPA54 or as required by local codes.
b) Combined vent- breeching:
• The recommended sizing in Section 14, "Boiler
Ratings and Dimensions", in this Manual is based
on a minimum chimney or vent height of 20 feet
and a maximum horizontal run of 6 feet to the
chimney with no more than one 90-degree
standard elbow.
• The minimum area of the chimney serving two or
more appliances must be at least the area of the
largest chimney connector plus 50% of the total
area of all other appliance connectors.
• The vent connector must be single wall steel or
Type B double wall vent pipe. The vent connector
must be Type B double wall if it is located in or
passes through cold areas. The vent connector
must extend into, but not beyond, the inside wall
of the chimney.
6. Vent Connection to Boiler (Figure 6):
a) Provide at least a three foot rise in the vent
connection on the boiler.
b) The vent system should provide a draft of at least
0.02" w.c. measured at the vent connections.
c) Support the weight of the vent system indepently of
the boiler draft hood. The draft hood is not designed
to carry structural loading.
d) Provide support ofthe vent connector (breeching] at
maximum 12 foot intervals to prevent sagging and
to provide a minimum upward slope of I/4" per foot.
e) Do not connect the vent for this boiler into any vent
system which operates with positive pressure.
f) Use Type B double-wall pipe for vents which run
through unheated spaces.
7.
Removing an existing boiler from a common vent: At the
time for removal of an existing boiler, the following steps
shall be followed with each appliance connected to the
common venting system placed in operation, while the
other appliances remaining connected to the common
venting system are not in operation.
Recommendedsizingfor chimney and connectors is
based on maximum 6 foot connector length and
maximum one 90 degree elbow.
Frovide suppo_for I_lz_taJ secl_s to preventsagging •
Slopeve_t connectorupw_d min 1/4 inch perfoot --
T
Connlz_t or must notprotrudeinlo chimney •
Boi)erven_ c0nnect0r shCuldbeh_ghet
than 0tha:connect e d app_ances
I_Do not obs_ct draft.hood openfn_
Figure 6: Vent Connection
a) Seal any unused openings in the common venting
system.
b) Visually inspect the venting system for proper size
and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
c) Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
venting system are located and other spaces of the
building. Turn on clothes dryers and any appliance
not connected to the common venting system. Turn
on any exhaust fans, such as range hoods and
bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer exhaust
fan. Close fireplace dampers.
d) Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust the
thermostat so appliance will operate continuously.
e) Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the flame of a
match or candle, or smoke from a cigarette, cigar or pipe.
f) After it has been determined that each appliance
remaining connected to the common venting system
propedy vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers
and any other gas-burning appliance to their
previous condition of use.
g) Any improper operation of the common venting
system should be corrected so the installation
conforms with the current edition of the National
Fuel Gas Code, ANSI Z223.1/NFPA54. When
resizing any portion of the common venting system,
the common venting system should be resized to
approach the minimum size as determined using the
appropriate tables located in the chapter "Sizing of
Category I Venting Systems" in the current edition
of the National Fuel Gas Code, ANSIZ223.1/NFPA54.