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The Bradford Ultra Low NOx Atmospheric Vent Water Heater uses a ultra low Nox
premix power burner located at the top of the water heater to direct a turbulent
flame down into the combustion chamber. This turbulence causes a thorough
mixing of gas and air for optimum combustion. The combustion gases then travel
through a single pass flue system keeping the gases moving at a high velocity.
The combination of high turbulence and velocity results in an optimum transfer of
heat from the flue gases into the water.
Burner operation is controlled using an electronic ignition module. The module
monitors the status of the electronic thermostat, blocked vent limit switch,
circulator flow switch, flame sensor to control output voltage to blower motor, spark
rod and gas valve. The module contains programming which determines the
sequence of operation and timings for purge periods, trial for ignition, flame
sensing and lockout. The module will also provide diagnostic information to help in
determining the cause of system lockouts.
The contents in this manual are detailed informational tools to assist in the proper
diagnosis of the Ultra Low NOx Atmospheric Vent Water Heater operational faults.
Please read this service manual completely and record as much information
regarding the Ultra Low NOx Atmospheric Vent Water Heater operation and
installation specifics related to any concerns.
The Bradford White Ultra Low NOx Atmospheric Vent Water Heater is designed to
deliver a remarkable amount of hot water at 84% efficient in a quiet running unit
with a low vent connection that allows for installation existing locations. Several
technologically advanced design features are incorporated in the design that will
require additional knowledge on the part of the qualified service provider. The
information in this manual will instruct service and maintenance professionals on
the function, proper diagnosis and repair of The Bradford White Ultra Low NOx
Atmospheric Vent Water Heater.
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