Part Number 550-142-302/0520
CGi
SERIES 4 — GAS-FIRED WATER BOILER —
Boiler Manual
8
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 con-
nected 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 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 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 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 previous con-
ditions 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 minimum size as deter-
mined using the appropriate tables in Part 13 of that code.
Canadian installations must comply with B149.1 or B149.2
Natural Gas and Propane Installation Code.
Chimney or vent
requirements
1. Venting must be installed according to Part 7,
Venting of Equipment, of National Fuel Gas
Code, ANSI Z223.1/NFPA 54 – latest edition and
applicable building codes. Canadian installations
must comply with B149.1 or B149.2 Natural Gas
and Propane Installation Code.
2. See Ratings table on page 66 for minimum chim-
ney 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 non-
corrosive materials are best. Advice for flue con-
nections 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 Na-
tional Fuel Gas Code ANSI Z223.1 /NFPA
54 – latest edition.
b. Provide drain trap to remove any conden-
sate.
Direct exhaust venting (Category III)
—
DO NOT COMMON
vent the CGi in a direct exhaust system (Category
III). Connecting more than one appliance to a direct exhaust system will cause flue gas spillage or appliance
malfunction, resulting in possible severe personal injury, death or substantial property damage.
Inspect existing chimney before installing boiler. Failure to clean or replace perforated pipe or tile lining will cause
severe personal injury or death.
