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must allow sufficient space behind the boiler to service vent connections, water pipe connections, piping and other
auxiliary equipment, as well as the appliance.
MODEL
A050
A075
A100
A150
A200
A250
A300
Multiple appliances may be installed side by side with 6" clearance between adjacent appliances to allow sufficient air for
the pilot blower. It is recommended to maintain 16" clearance between adjacent boilers to allow access for service to the
rear of the unit.
The minimum clearance between an Atlas boiler and a storage tank is 6". For alcove installations, the minimum clearance
to combustible construction is 6" to side, 24" to rear walls and 22" from top of the unit to the ceiling. The front alcove shall
remain open. This will allow boiler to be serviced in its location without movement or removal of the unit.
Note: Local and state codes requiring greater clearances supersedes these minimum clearances.
Outdoor Installations (Optional)
Atlas Condensing Boilers can be design–certified for outdoor installation. Boilers must not be installed under an overhang
that is less than 3' from the top of the vent terminal. Three sides must be open in the area under the overhang. Roof water
drainage must be diverted away from the boiler(s) installed under overhangs.
It is highly recommended that you allow sufficient space in front and the rear of the unit for replacement and adjustment of
all parts requiring such attention.
Caution: Keep the area around the unit(s) free from combustibles and flammable liquids.
2-4 Combustion and Ventilation Air
WARNING: THE LACK OF ADEQUATE COMBUSTION AIR IS THE SINGLE BIGGEST OPERATING PROBLEM
ENCOUNTERED WITH GAS FIRED WATER BOILERS
Note: Use of the boiler in construction areas where fine particulate matter, such as concrete dust or dry wall dust, is
present may result in damage to the boiler that is not covered by the warranty. If operated in a construction environment,
a clean source of combustion air must be provided directly to the boiler.
Your Atlas boiler is equipped with a filter to help prevent such an occurrence above and must be checked at least every
month. A single replacement filter is located inside the control box.
Indoor Units (Standard)
The boiler must be supplied with sufficient quantities of non–contaminated air to support proper combustion and
equipment ventilation. Combustion air can be supplied via conventional means where combustion air is drawn from the
area immediately surrounding the boiler, or via direct vent, where combustion air is drawn directly from outside. All
installations must comply with the requirements of the National Fuel Gas Code, NFPA 54, Canada B149, and all local
codes.
Note: In calculating free area, the required size of the opening for combustion, ventilation, and dilution air shall be based
on net free area of each opening. If free area through a design of louver or grill is known, it shall be used in calculating the
size opening required to provide the free area specified. For additional information, refer to the latest NFGC code
requirements.
TOP
CLEARANCE
CLEARANCE
18"
18"
18"
18"
22"
22"
22"
Table 2.1. Atlas Minimum Clearances
FRONT
SIDE
CLEARANCE
36"
6"
36"
6"
36"
6"
36"
6"
40"
6"
40"
6"
40"
6"
14
BOTTOM
CLEARANCE
0"
0"
0"
0"
0"
0"
0"
Rev 2.1
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