HW
BURKAY HOT WATER SUPPLY BOILER
HW - 300/399/420/520/670
Floor standing, gas fired.
•All castings are made of Bronze or Brass
•All water tubes are made from copper
•Brazed joints or flare union construction make the boiler immune to the effects of thermal shock and thermal cycling
•A great boiler for domestic hot water supply
•The efficient copper coil combustion chamber is a heat exchanger formed from a two passage coil of tightly wound continuous copper tube
•Water circulating through this coil surrounds the main burner and captures the
radiant heat
•A wrap of insulation on the outside of the coil retains the heat captured by the circulating water
•Directly above the coil and the main burner is a compact, horizontal, copper fin tube heat exchanger
•The flue gases must pass through this efficient heat exchanger before leaving the boiler
•This unique Burkay coil and heat exchanger design provide maximum heat transfer and proven field durability
•The patented Burkay burner uses primary air injection at up to 72 individual orifices plus secondary entrainment of air
•Approved for installation on combustible floors as shipped from factory.
•Slow opening redundant gas valves ensure smooth light-off without flame roll-out or pilot outage
•Patented pump delay system that allows boiler and pump to run simultaneously
but delays pump shut off at end of heating cycle to remove usable heat from the
heat exchanger and reduce the scale forming tendencies of motionless hot water
•Proven pilot ignition system provides flame failure response in under one (1) second
•Redundant high limit controls and gas valves assure safe shutoff in the event of
overheating or flame failure
•Requires 120V 60Hz, maximum inlet gas pressure of 14” WC and activation of boiler by external temperature control
•ASME approved, hydrostatically tested and certified for 160 psi
•Ships with ASME 125 psi relief valve
•These models meet the thermal efficiency and standby loss requirements of the U.S.
Department of Energy and current edition ASHRAE/IESNA 90.1.
SAMPLE SPECIFICATION
Hot Water Supply Boiler for domestic hot water purposes shall be Model(s) No.
__________________ as manufactured by A. O. Smith or an approved equal. Boiler(s) shall be gas-fired, and design certified by an ANSI approved/accredited independent rating laboratory, capable of supplying _____ gph at 100°F temperature rise equipped to burn __________ gas, with input rating of _____ BTU/hr. and bearing the ASME code symbol. Boiler(s) shall be up flow type having all nonferrous waterways, and employing a copper finned heat exchanger and a tightly wound copper coil combustion chamber with 160 psi working pressure rating. Boiler(s) shall be equipped with an electric gas valve of the step-opening type, an adjustable limit control which will break the electric circuit on temperature rise, intermittent ignition with one (1) second shutdown in the event of pilot flame failure, a gas pressure regulator properly set for the gas to be supplied, and a coil limit switch for shut off in event of excessive water temperature, a certified draft diverter and a fully illustrated instruction manual. Certified for installation on combustible flooring. Outer jacket shall be of baked enamel finish. The coil, heat exchanger and burner shall have a five year limited warranty as outlined in the written warranty.
© October 2018 A.O. Smith Water Products Company. All right reserved www.aosmithme.com
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