A.O. Smith HW 300 THRU HW 610 User Manual
Conservationisr, 82% efficiency
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82% EFFICIENCY
Meets or exceeds the requirements of ASHRAE/IES 90.1 b-
1992.
FEATURES
ALL NON-FERROUS WATERWAYS - All castings are made
of Bronze or Brass. All water tubes are made from copper.
Brazed joints orflare union construction make the heater immune
to the effects of thermal shock and thermal cycling. The best
boiler for hot water supply.
EFFICIENT COPPER COIL COMBUSTION CHAMBER -
The combustion chamber is a heat exchanger formed from a
two passage coil of tightly wound continuous copper tube. Water
circulating through this coil captures radiant heat. A wrap of
insulation on the outside of the coil retains the heat captured by
the circulating water.
COPPER HEAT EXCHANGER - Extended surface copper
tube having integral helical fins on the outside. The fins are
extruded directly from the tube. Burkay design provides a liberal
i heat transfer surface directly above the flame.
BURKAY BURNER MAXIMIZES EFFICIENCY - 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.
GAS VALVES - Slow opening redundant gas valves ensure
smooth light-off without flame roll-out or pilot outage. (Dual stage
& modulation not available.)
THERMAL BALANCER - 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
heater and reduce the scale forming tendencies of motionless
hot water.
AUTOMATIC
SAFE
CONTROLS
AND
ELECTRONIC
IGNITION - Natural gas units have a proven pilot ignition system
which provides flame failure response in under one (1) second.
Propane models have a standing pilot system. 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" W.C. and activation of heater by an
external temperature control.
OPTIONAL POWER VENT KIT - For sidewall venting.
WORKING PRESSURE - ASME approved, hydrostatically
tested and certified for 160 psi (1100 kPa).
* Model HW-399; 81% efficiency, Model HW-610: 80%
efficiency.
CONSERVATIONISr
COMMERCIAL BOILERS
HW-300 THRU HW-610
Domestic Hot Water Supply
Not approved for instantaneous applications.
FOR UNITS BUILT
FOR U.S.A.
FOR UNITS BUILT
FOR CANADA
LIMITED WARRANTY OUTLINE
If the heat exchanger modules should fail
within 5 years, under the terms of the war
ranty; A.O. Smith will furnish a replacement
part; installation, labor, handling and local
delivery extra. THIS OUTLINE IS N01 A
WARRANTY. For complete information,
consult the written warranty or A.O, Smith
Water Products Company.
Revised December 1996
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