Lochinvar CBN1257 1255 81% 1 specifications Copper-Fin Commercial Gas Boilers, Vent Cost-Savings

Copper-Fin®

Commercial Gas

Boilers

Energy Efficient, Cost Effective Boilers

Lochinvar first introduced Copper-Fin technology to the boiler industry some 50 years ago. Since then, we’ve continued to refine and perfect it - adding advanced fan-assisted combustion, hot surface ignition, a unique gasketless copper finned tube heat exchanger and highly efficient insulating materials.

Installation Flexibility and Cost-Savings

With compact sizes that use less floor space than ever before,
all Copper-Fin units are narrow enough to fit through a standard
36” doorway – an advantage most commercial boilers can’t provide.
Plus, thanks to special insulating materials, Copper-Fin units require
only 3” clearance from combustible walls. What’s more, our
Stack Frame allows you to install two units in the area
normally required for one. This makes it easier to fit multiple
Copper-Fin boilers into cramped mechanical rooms. And you
can even use a smaller diameter vent stack - up to 8” smaller than
typically required for comparable atmospheric boilers - so it saves
money as well as valuable mechanical room space.	Enhanced to Provide Performance and Serviceability

Unique Copper-Fin Heat Exchanger

The Lochinvar Copper-Fin boiler design uses a two pass heat exchanger. Water is circulated through a row of highly-efficient, finned copper tubes.

The high rate of water flow creates a scouring action that prevents sediment

and lime-scale buildup, common in conventional boilers, and

the finned copper tubes allow maximum heat transfer efficiency.

To create this special heat transfer capability,

Lochinvar extrudes the fins from thick wall copper tubing to

precise specifications - exactly 7 fins per inch.

The result is an integrally-finned tube with a heat transfer ratio 9 times greater than a plain copper tube.

Heavy-Duty Gasketless Design

What’s more, advanced casting processes allowed Lochinvar to develop a unique one-piece header system. This gasketless design provides enhanced reliability, improved durability and optimum performance - without the problems or failures common with O-rings and gaskets.

Meets the Toughest Air Quality Standards

Because of our unique fan-assisted combustion process, the Copper-Fin exceeds today’s toughest NOx emissions requirements. An independent certification laboratory test gave us a rating of less than 20 ppm - corrected to 3% O2. And less NOx means a cleaner environment.

Our enhanced Copper-Fin models offer the same reliable operation, and feature a more service friendly design. The down stream test valves and referenced gas valves are now in the upper deck for easier access, and the electrical and BMS connections have been repositioned to the front of the unit for easier installation.

The gas valves, which are referenced to the sealed combustion chamber, improve operational performance by monitoring the pressure in the sealed combustion chamber and adjusting gas flow to maintain the optimum air/fuel mixture. And the built-in air inlet filter reduces maintenance and improves performance by trapping dust and airborne particulates that can foul the burners and blowers. With dual sight glasses (one on each end), you can easily monitor burner performance and flame characteristics throughout the entire combustion chamber.

The operator interface panel provides two-stage electronic temperature control and comprehensive diagnostic status

without opening the control panel. Its user friendly design simplifies service while providing additional diagnostic information through a series of LEDs.

Vent Cost-Savings

Btu/hr	CONVENTIONAL	COPPER-FIN
INPUT	VENT SIZE	VENT SIZE	$ SAVINGS*
495,000	10”	6”	$ 382
645,000	12”	8”	$ 504
745,000	14”	8”	$ 829
985,000	16”	10”	$ 1,228
1,225,000	16”	12”	$ 992
1,435,000	18”	12”	$ 1,466
1,795,000	20”	14”	$ 1,564
2,065,000	22”	14”	$ 2,398

*Comparison based on 25´ vent system using Type “B” double wall vent material, storm collar and vent cap.