GSA
Gas-Fired Steam Boilers –
Boiler Manual
4
Part Number 550-110-738/1012
1 Prepare boiler location
continued
Vent System
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 obstruc-
tion 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 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 min-
utes 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 the common venting system should be
corrected so the installation conforms with the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 and/or CAN/CGA B149, Installation
Codes. When resizing any portion of the common venting sys-
tem, the common venting system should be resized to approach
the minimum size as determined using the appropriate tables
in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or
CANCGA B149, Installation Codes.
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:
• 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.
Flooring and foundation
Do not install boiler on combustible flooring or
carpeting even if a concrete or aerated foundation
is used. Fire can result, causing severe personal
injury, death or substantial property damage.
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.
3. Use a foundation with airways when:
• Electrical wiring or telephone cables buried in the concrete
floor of the boiler room.
• Concrete floor is “green”.
• Water is channeled under the concrete.
Boiler
model
Minimum
foundation
length
Minimum
foundation
“L” width
GSA-075 –– GSA-100
29 ⅝”
19”
GSA-125 –– GSA-150
29 ⅝”
23 ¼”
GSA-175 –– GSA-200
29 ⅝”
27 ½”
GSA-250
29 ⅝”
31 ¾”
GSA-300
29 ⅝”
36”
Table 1
Minimum foundation size
