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Part Number 550-110-639/0703
4
EG, PEG, EGH GAS-FIRED BOILERS — SERIES 4 — BOILER MANUAL
Chimney or vent requirements
(also refer to Breaching erection, Page 8)
Venting must be installed according to Part 7, Venting of
Equipment, of National Fuel Gas Code ANSI Z223.1-
latest edition and applicable building codes. Canadian
installations must comply with CAN/CSA B149.1 or .2
Installation Codes.
Minimum chimney or vent sizes are on page 27 of these
instructions. A chimney or vent without a listed cap
should extend at least 3 feet above the highest point where
it passes through a roof of a building and at least 2 feet
higher than any portion of a building within a horizontal
distance of 10 feet. A chimney or vent must not extend
less than those distances stated above.
A lined chimney is preferred and must be used when
required by federal, provincial, territorial, state, or local
building codes. Vitreous tile linings with joints that
prevent retention of moisture and linings made of
noncorrosive materials are best. Advice for flue
connections and chimney linings can be obtained from
local gas utility. Type “B” double wall metal vent pipe or
single wall vent pipe may be used as a liner.
Cold masonry chimneys, also known as outside
chimneys, typically have one or more walls exposed to
outside air.
When any atmospheric gas-fired boiler with automatic
vent damper is vented through this type of chimney, the
potential exists for condensation to occur. Condensation
can damage a masonry chimney.
Weil-McLain recommends the following to prevent
possible damage:
1. Line chimney with corrosion-resistant metal liner
such as AL29-4C® single wall stainless steel or B-vent.
Size liner per National Fuel Gas Code ANSI Z223.1-latest
edition.
2. Provide drain trap to remove any condensate.
Inspect existing chimney or vent before
installing boiler. Failure to clean or replace
perforated pipe or tile lining will cause
severe injury or death.
Do not alter boiler draft hood or place any
obstruction or non-approved damper in
the breeching of vent system. CSA
certification becomes void. Flue gas spillage
and carbon monoxide emissions will occur
causing severe personal injury or death.
Where two or more gas appliances vent into a common
chimney or vent, equivalent area should be at least equal
to the area of the vent outlet on the largest appliance plus
50 percent of the area of the vent outlet on the additional
appliance.
When removing boiler from common venting
system
Failure to follow all instructions listed below can cause flue gas
spillage and carbon monoxide emissions, resulting in severe
personal injury, death or substantial property damage.
At the time of removal of an existing boiler, the following steps shall be
followed with each appliance remaining connected to the common venting
system placed in operation, while the other appliances remaining connected
to the common venting system are not in operation.
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 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 properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace dampers, and any other gas-
burning appliance to their previous conditions of use.
g. Any improper operation of the common venting system should be corrected
so the installation conforms with the National Fuel Gas Code, ANSI Z223.1-
latest edition. 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 in Part 11 in the National
Fuel Gas Code, ANSI Z223.1-latest edition.
Canadian installations must comply with CAN/CSA B149.1 or .2 Installation
Code.
Select the boiler location
• Consider all connections to boiler before selecting a location.
• Boiler must be installed so gas control system components are protected
from dipping or spraying water or rain during operation or service.
• Non-combustible floor ONLY. See “Boiler foundation”, Page 5.
To avoid personal injury, death or property damage, keep boiler
area clear and free from combustible materials, gasoline and
other flammable vapors and liquids.
Installation
(continued)
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