Lochinvar CHN0991 User Manual

High Efficiency In A Space-Saving Design

Commercial Gas
Boilers

From 400,000 to 2,070,000 Btu/hr

85% Thermal Efficiency

Less Than 20 ppm NOx Rating

Copper-Fin II

®

Gas Boilers – The Proven Performers.

Thermal Efficiency Is Higher.....

While Footprint And Vent
Sizes Are Smaller

Lochinvar’s Copper-Fin
II line of high efficiency
commercial gas boilers
gives you all the advantages
of copper finned tube heat
exchanger technology
plus the benefits of a
sealed combustion system.
Every Copper-Fin II model
offers four major advantages:
higher efficiency, smaller
footprint, smaller vent
diameters and multiple
venting options. Our
Copper-Fin II models
offer dollar - stretching
proportional firing that
provides a measured
response to the demand for
heat — as much or as little
as needed.

Outstanding Thermal Efficiency

Copper-Fin II boilers offer a remarkably high 85% thermal
efficiency. This means that 85¢ out of every fuel dollar goes
into heating the water, dramatically reducing the operating
cost of the equipment. Copper-Fin II achieves this efficiency
through the combination of an advanced fan
assisted combustion system and exclusive
gasketless copper fin tube heat
exchanger. A time tested and
proven combination.

The heat energy from the
combustion process is transferred
to the water as it passes through
the solid copper finned tube heat exchanger. The sealed
combustion design of the Copper-Fin II eliminates external
heat losses, this means that the energy dollars heat the water,
not the mechanical room. It also ensures that the jacket stays
cooler, providing greater safety and requiring less clearance
from combustible walls - just 1” in most cases.

Proportional Firing: Greater Savings, More
Accurate Temperatures

The Copper-Fin II’s proportional firing lowers your energy
costs and delivers more consistent water temperatures.
Multiple gas valves supply gas to the burners in stages,
and multiple speed blowers maintain the proper airflow to
ensure the most efficient combustion at each level of use.
Our built-in sequencer controls each of these functions. With
digital accuracy, the built-in sequencer carefully monitors
the need for heat, and as demand increases or decreases, it
automatically adjusts the blower output and gas valve input.
As the demand is met, the boiler decreases output gradually,
turning off gas valves and reducing combustion air in direct
proportion. This allows the Copper-Fin II to maintain a

constant setting. In fact, it’s accurate to within
1° Fahrenheit — a remarkable achievement for
units of this capacity. And the proportional firing
system features component redundancy, greatly
reducing the chance for total system shutdown.

Compact Design - For Installation Ease

The Copper-Fin II is compact enough to fit
through standard 36” doorways with ease. Even
our 2 million Btu/hr model is only 33-1/2” wide.
This space-saving design frees up more space in

the mechanical room. And our optional Stack Frame

lets you put two units in the footprint of just one.

Meets The Toughest Air
Quality Standards

Because of our unique fan-assisted
combustion process, the Copper-Fin II

exceeds today’s toughest NOx emissions
requirements. An independent certification
laboratory test gave us a rating of less than

30 ppm — corrected to 3% O2. And less
NOx means a cleaner environment.

Control at Your Fingertips

The enhanced operator interface panel provides fingertip
control of the built­in multi-stage digital
temperature controller.
Its refined user friendly
design simplifies service
while providing additional
diagnostic information with
fewer mechanical parts.

Making Installation Easier... For Less

High-efficiency, fan-assisted combustion means you can
use a smaller diameter vent stack — up to 8” smaller than
typically required. This makes installation less expensive
and less time-consuming.

Vent Cost Savings

Btu/hr ATMOSPHERIC COPPER-FIN II
INPUT VENT SIZE VENT SIZE $ S

400,000 10” 6” $ 657.00
500,000 10” 6” $ 657.00
650,000 12” 8” $ 731.00
750,000 14” 8” $ 1,450.00
990,000 16” 10” $ 1,790.00
1,260,000 16” 12” $ 1,463.00
1,440,000 18” 12” $ 2,432.00
1,800,000 20” 14” $ 3,526.00
2,070,000 22” 14” $ 3,738.00

*Comparison based on 25´ vent system using Type “B” double wall vent material,

storm collar and vent cap.

AVINGS*