Lochinvar KNIGHT XL KBN600 - Manual (Page 2)

The KNIGHT
®
XL, engineered with Lochinvar’s exclusive SMART SYSTEM ™ control and an
array of other innovative features, places it far ahead of any commercial heating boiler
in its class. It promises and delivers ultimate ease of installation and maintenance. With
up to 94.6% thermal efficiency, low-NOx emissions and a fully modulating burner, it is
the best ”green choice” for today’s environmentally focused market.
Five modulating/condensing stainless steel KNIGHT XL boilers are available, with
399,000–800,000 Btu/hr inputs, with remarkably small space-saving footprints. All are
equipped for direct-vent installation with air intake and exhaust runs up to 100 feet using
PVC, CPVC or AL29-4C venting materials. This range of choices is ideal for light-duty
applications such as small hotels, schools and office buildings. For higher-demand
applications, up to eight KNIGHT XL units can be installed utilizing the built-in cascading
sequencer to deliver up to 6.4 million Btu/hr heating capacity.
THE KNIGHT XL BOILER reflects Lochinvar’s constant commitment to providing all the
options you need to serve every application.
The Knight XL Combustion System
Advanced Negative Regulation Technology
KNIGHT XL safely and reliably operates with supply gas pressure as low as 4 inches water column, as Negative
Regulation (Neg/Reg) technology automatically adjusts fan speed that ensures the correct volume and mix of
fuel and air throughout the firing range.
”Fail-Safe” Direct-Spark Ignition
With each call for heat, two electrodes ignite the fuel/gas mixture. A third
electrode then senses for flame. SMART SYSTEM will lock out and display
the fault if ignition does not occur.
Two-in-One Stainless Steel Heat Exchanger
A combined primary and secondary heat exchanger captures flue gas heat
and allows entering water temperatures as low as 50°F. The stainless steel,
pH-tolerant design features a weld-sealed assembly with no O-rings or gaskets,
and does not require special glycol. ASME Section IV approved and stamped.
Fully Modulating Burner
The SMART SYSTEM allows fully modulating combustion with 5:1 turndown. The burner can fire as
low as 20% of maximum input, and modulates the firing rate up to 100% as demand increases.
The burner is a single stainless steel assembly covered with woven steel mesh, and fires in a 360°
pattern along the entire length of the primary heat exchanger. This allows the compact KNIGHT XL
to exceed the capacity of units with larger multiple burners.
Th KNIGHT
®
XL i d i h h L hi ’ l i SMART SYSTEM ™ l d
The Smartest Choice for Condensing Boiler Performance
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