Part Number 550-142-300/0520
8
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
Prepare boiler location — vent system
1c
Failure to follow all instructions can result in flue gas spillage and carbon monoxide emissions, causing severe
personal injury or death.
When removing boiler from an
existing common vent system:
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 op-
eration, 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 or other
deficiencies which could cause an unsafe condition.
c.
Test vent system
— Insofar as is practical, close all
building doors and windows and all doors between
the space in which the appliances remaining con-
nected to the common venting system are located
and other spaces of the building. Turn on clothes
dryers and any appliance not connected to the com-
mon 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 sum-
mer exhaust fan. Close fireplace dampers.
d.
Place in operation
the appliance being inspected.
Follow the operating instructions. Adjust thermostat
so appliance will operate continuously.
e.
Test for spillage
at draft hood relief opening after
5 minutes of main burner operation. Use the flame
of a match or candle.
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 previ-
ous conditions of use.
Any improper operation of common venting system
should be corrected so the installation conforms with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54
-latest edition. Correct by resizing to approach the mini-
mum size as determined using the appropriate tables in
Part 13 of that code. Canadian installations must comply
with Natural Gas and Propane Installation Code, CAN/
CSA B149.1 or B149.2 Installation Code.
Chimney or vent require-
ments
1. Venting must be installed according to Part 7, Vent-
ing of Equipment, of National Fuel Gas Code, ANSI
Z223.1-latest edition and applicable building codes.
Canadian installations must comply with B149.1 or
B149.2 Installation Codes.
2. See Ratings table on page 65 for minimum chimney
or vent sizes. 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 the
distances stated above.
3. A lined chimney is preferred and must be used when
required by local, state, provincial and national
codes, laws, regulations and ordinances. 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.
4. Cold masonry chimneys, also known as outside
chimneys, typically have one or more walls ex-
posed 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.
a. 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.
b. Provide drain trap to remove any condensate.
5. Where two or more gas appliances vent into a
common chimney or vent, equivalent area should
be
at least equal
to area of vent outlet on largest
appliance
plus 50 percent
of vent outlet area on
additional appliance.
Do not alter boiler draft hood or place any obstruction or non-approved vent damper in breeching or vent system.
CSA certification will become void. Flue gas spillage and carbon monoxide emissions will occur causing severe
personal injury or death.
Inspect existing chimney before installing boiler. Failure to clean or replace perforated pipe or tile lining will cause
severe personal injury or death.
