Optional low NOx emission package will allow the unit to
operate at less than 30 ppm of NOx to meet low emission
nds. This is achieved without flue gas recirculation
and for very little additional cost. The standard unit will
operate at less
than 50 ppm Nox.
An electronic flame safeguard is provided with each burner.
The standard flame safeguard
provides automatic sequencing
and checking of each step of the burner operation.
On a call for heat by the
water heater operating temperature
control, the limits are checked for safety and the blower motor
starts. The air supply is pro
ved and the burner is pre
for 30 seconds. After pre
purge, the runner pilot gas valve
opens and the runner pilot is spark
ignited. Spark is
continuously maintained through the combustion cycle. After
the runner pilots have made a traverse below all
nozzles and have been proved by the flame rod within 10
seconds, the main gas valve opens. When the call for heat is
sfied, a 15 second post purge of the heater completes the
Standard safety controls monitoring the combustion cycle
include low water cutoff, high limit temperature control and air
proving switch. The electronic combustion safeguard provides
0% safety shutdown within 3 seconds of flame failure.
SELLERS ENGINEERING CO., MANUFACTURING BOILERS AND WATER HEATERS SINCE 1931.
SPECIFICATION SHEET NO.
MODEL BT WATER HEATER
The long, small diameter firing tunes in Sellers Immersion
Water Heaters expand and contract sufficiently on
intermittent firing to break loose hard scale that might form
on the tubes. It drops to the cool bottom in small pieces
n be washed out through the clean
With immersion firing, harder water can be heated. Tubes
GENERAL FIRING DETAILS
All of the combustion air
both primary and secondary
is provided by a direct connect, motor driven blower wit
the housing and fan internally mounted in the burner
assembly. The combustion chamber is pressurized by the
secondary air whic
h is controlled by means of an outside
The primary air is metered to the approximate volume
required by a fi
xed air jet in the built
in air gas mixer. An
adjustable shutter is provided at the inlet to the blower to
allow minor adjustmen
ts as required on a particular
The burner, except for the electrical parts, the gas pressure
regulator and the bl
ower impeller, are warranted for 5 years.
Handhole openings are provided at front, rear and bottom of
the shells for inspection and cleaning. The pressure vessel
nted for 10 years against leakage. See warranty for
The Sellers Model BT water Heater is a
industrial gas fired
assembly. It combines hi
storage and hi
n a single complete unit.
Immersion firing provides high efficiency
with minimum maintenance. The heaters
are approved as a unit
Laboratories and factory fire tested before
All Sellers Water Heaters are built
conform with Section IV of the ASME
code and stamped with the “H” cloverleaf.
Licensed inspectors check construction
ness final pressure testing. An
ASME Inspection Data Report is
furnished. The pressure vessels are
available for standard maximu
pressures of 100, 125 or 150 psi.