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Part number 550-110-260/0200
8
GOLD CGs Gas-Fired Water Boiler
Prepare boiler location — vent system
Vent system
The CGs boiler requires a special vent system, designed
for pressurized venting. Model CGs-3 is rated ANSI
Z21.13 Category IV (pressurized vent, likely to
condense in the vent). Models CGs-4, -5 and -6 are rated
Z21.13 Category III (pressurized vent).
You may use any of the vent systems covered by the
CGs Venting Supplements included in the envelope
assembly. The CGs vent starter is a special item, designed
only for the CGs boiler, available from each vendor.
Do not attempt to connect the vent to the CGs boiler
with any other means.
DO NOT mix components from
different systems. The vent system
could fail, causing leakage of flue
products into the living space.
Vent termination and
combustion air supply
The CGs boiler may be vented through the roof or
through a side wall. Follow the appropriate vent
supplement for the vent system chosen. The maximum
vent length depends on boiler size. Refer to the vent
supplement to determine acceptable vent length.
Combustion air for the CGs boiler may be from inside
or ducted directly to the boiler from outside. For
outside air (direct vent installation), two options are
available for the flue/air termination. The air supply
must
ALWAYS terminate at the same location as the
flue, using either:
1. Vertical direct vent installation. Obtain the Weil-
McLain Through-Roof or Through-Unused
Chimney
termination kit and supplement. Refer to
Vertical Direct Venting Venting Supplement, packed
with the kit, and to the vent manufacturer’s
instructions for the vent material chosen.
2. Sidewall direct vent installation. Use the Vent/Air
Intake
termination kit shipped with the boiler.
Refer to
CGs Direct Venting: Sidewall & Direct
Exhaust Venting: Vertical or Sidewall
Venting
Supplement shipped with the boiler.
Do not install the CGs into a
common vent with any other
appliance. This will cause flue gas
spillage or appliance malfunction,
resulting in possible severe personal
injury, death or substantial property
damage.
Failure to follow all instructions can
result in flue gas spillage and carbon
monoxide emissions, causing
severe personal injury or death.
1c
Removing from existing vent
CGs special vent system
When removing boiler from 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 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 lighting 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, 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.
Any improper operation of common venting system
should be corrected so the installation conforms with
the National Fuel Gas Code, ANSI Z223.1 — latest
edition. Correct by resizing to approach the minimum
size as determined using the appropriate tables in Part
11 of that code. Canadian installations must comply
with B149.1 or B149.2 Installation Code.