Lochinvar PBN0250 User Manual

88% Thermal Efficiency

Compact Design

Multiple Venting Options

Category II Venting

Gas Fired
Boilers

LOW

NO

X

LOWLOW

NONO

X

The High-Efficiency,
High-Output Compact Boiler

The Power-Fin’ s unique approach to boiler design means
benefits everyone will enjoy . For the installer, it means
lighter weight and easier servicing. And end-users
everywhere will appreciate the significant energy savings
and fast, accurate response to the call for heat.

What’s more, unit capacities range as high as1,000,000
Btu/hr but require just 5.75 sq. ft. of floor space. Only the
Power-Fin—with its high efficiency output—can offer
such heavyweight performance in a boiler so compact.
Here’s how.

Unique Circular Copper-Fin®Heat Exchanger

At the heart of this unit is our circular Power-Fin heat
exchanger. Using a special process, the outer wall of the
copper tube is precision extruded to form exactly 7 fins per
inch. The result is an
integrated
design with a
heat transfer
ratio that is 9
times greater
than ordinary copper
tubing.

T o create the combustion
chamber, these highly
efficient copper tubes are
secured by two high-grade
cast iron headers in
a circular pattern—
completely surrounding the
flame. This not only
ensures optimum
efficiency, it also
eliminates the need for
a bulky refractory lining.
Finally , the entire assembly is hydrostatically-tested, ASME
stamped and approved for 160 psi working pressure.

The Advantages Of Sealed Combustion

Another feature contributing to the remarkable efficiency
of the Power-Fin boiler is its unique combination of a sealed
chamber and fan-assisted combustion. This design allows the
amount of intake air to be precisely metered to match gas
input for better, cleaner and more complete combustion. And
the unique burner design projects flames in a full 360° pattern.

The combustion air fan serves a dual function by
providing the exact volume of combustion air as well

as inducing a continuous flow of cooling air around the
combustion chamber. Pre-pur ge and post-purge cycles
provide added protection, while a pressurized, sealed
chamber prevents spillage of gas and combustion
by-products.

Diagnostic Systems And Controls

T o ensure fail-safe operation, every major function ofthe
Power-Fin is automatically controlled and checked by a
convenient plug-in control panel with advanced diagnostic
features. A series of relays, warning lights and proving
switches continually monitor each phase of the system’s
operation.

These not only warn against boiler failure, they actually
help pinpoint the source of any problems—from
combustion air or low gas pressure, to water temperature or
water flow .

We also designed the Power-Fin with our own fuel-saving
Hot Surface Ignition. And a convenient built-in temperature
resistant glass viewing port allows for visual checks of
ignition and burner operation.

Compact, Accessible Design

The Power-Fin gives you the best of both worlds:
high efficiency and a compact design. In fact, our one
million Btu/hr system requires just 5.75 square feet of floor
space—making it a designer’s dream. Plus, its high
efficiency and unique circular heat exchanger eliminates the
need for a bulky refractory lining. So at just over 700
pounds, it’s an installers’ dream too.

For added flexibility , the Power -Fin is approved for zero
clearance installations and offers five convenient venting
options from which to choose. Both vertical and horizontal
direct-vent sealed combustion configurations are available,
as well as venting for outdoor applications.

The Power-Fin is designed for faster servicing, too. The
bolted header inspection cover on all models can be easily
removed for field inspection of tube interiors. And the entire
heat exchanger can be removed through the front of the
boiler.

by Lochinvar

®

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