11
Rev 2.1
1-3 Rating and Certifications
All units must be installed in accordance with all state and local codes, and national codes, including but not limited to:
• ANSI Z21.10.2, Gas Water Boilers
• ANSI Z223.1/ NFPA 54, National Fuel Code
• ANSI/ NFPA 70, National Electric Code
All Ajax, Atlas and Ace Boilers are National Board approved and designed–certified and tested by Intertek (E.T.L.),
standards for the US and Canada (Can Std 1-3.1), and UL 795. Each unit is constructed in accordance with Section IV of
the American Society of Mechanical Engineers (ASME) Boiler Pressure Vessel Code and bears the ASME “HLW” stamp
or “H” stamp.
WARNING: Altering any Ajax, Atlas or Ace boilers pressure vessel by installing replacement heat exchangers,
tube bundles, coils or any ASME parts not manufactured and/or approved by Ajax will instantly void the ASME
and E.T.L. rating of the vessel and any Ajax warranty on the vessel. Altering the ASME or E.T.L. ratings of the
vessel also violates national, state, and local approval codes.
Installations at Elevation
Rated inputs are suitable for up to 2,000 ft. elevation without de-rating. Consult the factory for installations over 2,000 ft.
above sea level. No hardware changes are required to the unit. (Adjustments may be required).
1-4 Connection Information
Figure 1.1. Atlas Connection Diagram
1-5 General Safety
In order to meet commercial hot water needs, the high limit safety control on this hot water boiler is adjustable up to 240
degrees F by the OEM or installer only. However, water temperatures exceeding over 125 degrees can cause instant
and severe burns or death from scalds. When supplying general purpose domestic hot water, the recommended
setting for the Operating control is 125 degrees F.
MODEL AIR
INTAKE
EXHAUST
VENT
WATER
IN/OUT
PROPANE/NATURAL
GAS INLET
A050 4" 6" 2" 1"
A075 4" 6" 2" 1"
A100 6" 8" 2" 1"
A150 6" 8" 2" 1 ¼"
A200 8" 10" 2 ½" 1 ¼"
A250 10" 12" 2 ½" 1 ¼"
A300 10" 12" 2 ½" 1 ¼"
CONNECTION SIZES
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