Lochinvar IBN1500 User Manual

High Efficiency Commercial Gas Boilers

Up to 97% Thermal Efficiency

1.5, 1.7 & 2.0 Million Btu/hr

Less than 20ppm NOx

Variable Frequency Drive Lets You Change Output to Match Demand

Intelli-Fin is the first boiler to feature variable frequency drive technology. Variable frequency drive further increases the thermal efficiency by precisely supplying the proper amount of gas and air to the burner. Ensuring this balance yields complete combustion and therefore increased Btu/hr output. Just as the electronic fuel injection system in your car adapts to changes in atmosphere, Intelli-Fin’s variable frequency drive allows the system to adjust. This means maximum efficiency, no matter what the building demand may be.

In addition to the tight control of the combustion system, variable frequency drive allows Intelli-Fin to adjust its output to meet demand, limiting excessive heat thereby maximizing efficiency. Because the variable frequency drive controls fan motor speed in an infinitely proportional manner, Btu/hr output can be adjusted to match any heating demand. In fact, Intelli-Fin can reduce output from 100% down to 25% of rated capacity and efficiently provide heat at any fraction of the load in between.

This variable combustion process combined with Lochinvar’s new temperature control, accurate to within 1°F, enables Intelli-Fin to track the heating load precisely. By precisely tracking the heat load, Btu/hr output equals the facility heat loss. This means that your heating system can automatically provide the required amount of heat on warm fall afternoons and frigid winter mornings, without wasting energy. With Intelli-Fin, it is now possible to tailor system output to meet demand, while significant energy is saved and short cycling is eliminated. That’s an intelligent new advantage for you.

Flexibility in Water and Gas Supplies

Intelli-Fin’s advanced burner technology operates within a broader range of inlet gas supply pressures. Intelli-Fin can operate with a minimum inlet gas pressure as low as 4 inches water column. This advanced design prevents nuisance operational problems in areas of varying gas supply pressures. Unlike other high efficiency products, Intelli-Fin will not require high-pressure gas service or additional gas pressure boosters.

1 One key advantage of the Intelli-Fin’s

variable frequency drive, is that it adjusts output capacity anywhere between 100% and 25%. (yellow bar shows output capacity) . In this chart, Intelli-Fin operates at minimum output to satisfy a small night set-back load (this 1.5 million Btu/hr boiler is operating on inlet temperature).

2/3 As the heat load begins to

increase a drop in return temperature is sensed. To compensate the firing rate is increased and once again Intelli-Fin begins to track the heating load.

4 Suddenly, a change in building

occupancy doubles the required heat load, forcing Intelli-Fin to operate at its full rated output. Although this single unit is not sized to handle a load of 1,628,000 Btu/hr it is able to maintain a system temperature within 6°F of setpoint.

5 As building load decreases, the boiler

reduces its firing rate making infinite adjustments to meet the changing demand.

Intelli-Fin Precisely Tracks the Building Heat Load and Adjusts Heat Output

Time (minutes)

% Output

100%

90% 80% 70% 60% 50% 40% 30% 20% 10%

1 23 4 5

100%

Outlet

Inlet

Setpoint

25%

335,000 675,000 872,000 1,628,000

50%

64%

102

111

Return Temp

Setpoint

Output

120

129

195°

185°

175°

165°

155°

145°

135°

125°

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