4
Part Number 550-142-320/0720
GWA
Series 3
Gas-Fired Water Boilers –
Boiler Manual
1 Prepare boiler location
continued
Failure to follow all instructions can result in flue
gas spillage and carbon monoxide emissions,
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.
Do not alter boiler draft hood or place any
obstruction or non-certified 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.
The following requirements apply when you
remove an existing boiler from a vent system
shared with other appliances.
If the new boiler
will not use the common vent
, you must test (as
described below) each remaining appliance —
operating by itself — to verify that the vent system
operates adequately.
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 build-
ing 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 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 appropri-
ate tables in Part 13 of that code.
Vent system
Figure 1
Minimum clearances
Flooring and foundation
Flooring
The GWA boiler is approved for installation on combustible
flooring, but must never be installed on carpeting.
Do not install boiler on carpeting even if foundation
is used. Fire can result, causing severe personal
injury, death or substantial property damage.
Foundation
1. Provide a solid brick or minimum 2-inch thick concrete
foundation pad if any of the following is true:
• floor can become flooded.
• the boiler mounting area is not level.
2. See Table 1 for minimum foundation dimensions.
Residential garage installation
Take the following special precautions when installing the boiler
in a residential garage. If the boiler is located in a residential
garage, per ANSI Z223.1, paragraph 5.1.9:
• Mount the boiler a minimum of 18 inches above the floor
of the garage to assure the burner and ignition devices will
be no less than 18 inches above the floor.
• Locate or protect the boiler so it cannot be damaged by a
moving vehicle.
Small space installations
1. When the boiler is located in a closet or small space, provide
clearances no less than those shown in Figure 1. The clear-
ances are required to any surface, whether combustible or
non-combustible.
Clearances
continued
