Lochinvar IWN1500, IWN1700, IWN2000 User Manual

High Efficiency Commercial Gas Water Heaters

97% Thermal Efficiency

LonWorks

Compatible Intelligence

Highly Flexible and Ultra Quiet

Super Compact Design

Variable Frequency Drive Lets You Change Output to Match Demand

Intelli-Fin is the first water heater to feature variable frequency drive. 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, the Intelli-Fin’s variable frequency drive allows the system to adjust. This means maximum efficiency, no matter what the system load 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 domestic load precisely. By precisely tracking the load, hot water

output equals the facility domestic load. This means that your water heater can automatically provide the required amount of hot water for large dump loads and consistent draw applications, 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 of water column. This advanced design prevents nuisance operational problems in areas of varying gas supply pressures. Unlike other high efficiency products, Intelli-Fin does not require high pressure gas service or additional gas pressure boosters.

The sophisticated heat transfer system of Intelli-Fin integrates dual heat transfer surfaces with a fully automatic pumped bypass. This innovative design provides increased installation flexibility within low return water temperature applications, allowing Intelli-Fin to operate with return water temperatures as low as 50°F. The fully automatic bypass controls the point where condensate occurs within Intelli-Fin. This innovative design increases the product flexibility, maximizes efficiency and eliminates worry.

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118

126

135

143

151

180˚F 170˚F 160˚F 150˚F 140˚F 130˚F 120˚F 110˚F 100˚F

90˚F 80˚F 70˚F 60˚F 50˚F 40˚F

26 min. 41 min. 37 min. 45 min.

No Draw Varing GPH Draw Rates

1200 GPH

2400 GPH

2100 GPH

1800 GPH

1500

GPH

450

GPH

288

GPH

Inlet

Setpoint

752 USG

T ank

Cold-Start

100%

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

Btu/hr

Output

Time (minutes)

emp.

1 2 3 4

Inlet Temp

Setpoint

Output

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 full capacity during cold start to heat a 752-gallon tank from a 40-degree inlet water temperature up to the 130-degree set point, then reduces capacity as water temperature rises.

2 Once the tank is full and there is no demand on

the system, Intelli-Fin shuts down.

3 A sudden 1200 GPH draw re-starts the unit,

which quickly compensates and then begins modulating again to maintain the setpoint temperature.

4 Varied demand shows how the water heater

continually adjusts to demand tracking the set point with precise Btu/hr output, maximizing efficiency.

Intelli-Fin®Precisely Tracks Domestic Water Demand and Adjusts Heat Output

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