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

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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%

0%

1 23 4 5

100%

Outlet

Inlet

Setpoint

25%

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

0

50%

9

18

28

37

64%

46

55

65

74

83

92

102

111

Return Temp

Setpoint

Output

120

129

195°

185°

175°

165°

155°

145°

135°

125°

LonWorks compatible, Intelli-Fin's Command
Display also allows for up to 21 diagnostic
readouts. Custom controls also allow you to
equalize run time in sequenced boilers.

desired, all Intelli-Fin functionality can be accessed,
reviewed and adjusted via a phone line and personal
computer. This means increased peace of mind and the
ability to adjust the system without an expensive
service call.

An Intelligent Use of Space

Intelli-Fin is about the size of a four-drawer filing
cabinet. This remarkably small footprint makes it ideal
for retrofit installations as well as new construction. In
fact, it’s often easier to retrofit an Intelli-Fin system than
remove an existing system because it's so much smaller
and easier to install.

Intelli-Fin’s chassis has been engineered so that it
makes use of vertical rather than horizontal space.
This allows the smaller footprint, but the unit is still so
compact that it fits in spaces no higher than 80 inches.

For even more convenience, Intelli-Fin offers several
venting options. It’s even possible to direct vent the
Intelli-Fin through a side wall.

Intelligent Enough To Provide
Diagnostic Support

Intelli-Fin adds a new dimension to communications.
Thanks to its intelligence, it can identify problems and
notify the proper maintenance people, even providing
diagnostic codes for as many as 21 separate functions.
It’s even possible to communicate remotely with the
system, so maintenance staff can investigate alarms
from offsite and determine specific needs, therefore being
better prepared should onsite service be necessary.

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 such as heat pump,
snow melting, and radiant floor systems. This design
allows 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.

Intelligent Enough to Speak Your Language

Intelli-Fin is the first boiler designed to be compatible
with LonWorks

®

, the interoperability language that is
fast becoming the language standard for building
management systems. LonWorks allows Intelli-Fin to
provide open control protocols that let it function in a
broad range of building management systems*.

*Lonworks Systems requires profesional integration.

The LonWorks network protocols are in use across a
broad range of building management products, and
with the introduction of Intelli-Fin, it is easier to link
components for simplified building integration.
LonWorks also simplifies building upgrades in the
future.

To enhance this LonWorks performance Lochinvar has
developed a new control, which provides a remarkable
amount of information and the ability to customize
equipment for a specific application. This control
along with the Command Display allows local monitoring
of 21 diagnostic points and adjustment of 6 operational
characteristics. If remote system management is

Multiple Intelli-Fin units can be sequenced to add
capacity and enhance efficiency. Sequencing
options include first on/first off with lead lag,
first on/last off, efficiency optimization, and run
time optimization. Efficiency optimization uses
advanced processing technology to determine
how units can most effectively balance demand
and available capacity.

Intelli-Fin can operate with a broad range
of gas pressure and water temperature
situations thanks to its intelligent controls
and unique heat exchanger arrangement.
The dual heat exchanger arrangement
preheats return water to control
condensate formation. Using a pumped
bypass, a portion of the heated supply
water is recirculated to raise inlet
temperature to a point where
condensation on the primary heat
exchanger is avoided. In addition, gas
and air supply for combustion are also
adjusted to ensure sufficient Btu/hr
output to raise supply water temperature
to the prescribed set point.

Intelli-Fin
provides thermal
efficiency ratings
as high as 97%.
Because of its
ability to infinitely
modulate
operation,
efficiency is
maintained at
maximum levels
to provide lowest
total operating
cost.

Venting Options

See Installation and Design Documents for details

Return Water Temperature

Btu/hr

Output

% Thermal Efficiency

Intelli-Fin Efficiency Data at Firing Rate

Intelli-Fin®Operating Schematic

Intelli-Vent

Vertical

Vents vertically up to
100 equivalent feet.
Directly draws
combustion air 100
equivalent feet from
a side wall.

Intelli-Vent

Horizontal

Vents horizontally up
to 100 equivalent feet.
Directly draws
combustion air 100
equivalent feet from
the roof top.

Vertical

Vents vertically using
Category IV approved
vent material.

Sidewall

Vents horizontally up
to 100 equivalent
feet.

Direct Vent

Horizontal

Vents horizontally up to
100 equivalent feet.
Directly draws
combustion air 100
equivalent feet from
a side wall.

Direct Vent

Vertical

Vents vertically up to
100 equivalent feet.
Directly draws
combustion air 100
equivalent feet from
the roof top.

Five Year Burner Warranty

Our Alcromesh (aluminum/
chromium alloy) metallic
burner disperses the flame to
improve heat transfer. This
unique construction also
improves durability. In fact,
our burner features a five
year warranty.

The Intelligent Approach to Hydronics

Lochinvar has a tradition of setting industry
standards for boiler efficiency, and our new Intelli-Fin
Series takes efficiency to a new level – not just with
superior boiler technology, but with a new level of
intelligence.

Our 1.5 million, 1.7 million, and 2 million-Btu/hr
Intelli-Fin boilers are whisper-quiet. They are
engineered to take advantage of the power of digital
communications. That’s a powerful advantage,
because this capability, along with Lochinvar’s
engineering, means Intelli-Fin provides you with

the lowest total cost of boiler operation.

Pushing the Upper Limits of Efficiency

Intelli-Fin has been engineered so that it offers a
dramatic increase in efficiency. Independent testing
shows that Intelli-Fin reaches 97% thermal efficiency.
That means for every energy dollar, 97 cents is
converted into useable heat. That’s pushing the
limits of what is possible within the laws of physics.

To achieve this higher efficiency, Lochinvar utilizes
a dual heat exchanger arrangement to create a heat
trap. One heat exchanger surrounds the units burner,
absorbing heat at the point of combustion. A second
heat exchanger captures additional heat as the spent
gases are extracted from the combustion chamber.
The position of this second heat exchanger forces
the products of combustion to flow over it’s entire
surface allowing the remaining heat to be absorbed
and transferred to the heating water.

If your project demands high efficiency, Intelli-Fin
delivers. In fact, it’s virtually impossible to be
any better.

Intelli-Fin’s dual heat exchanger arrangement
creates a heat trap to capture convective heat
flow. Trapping this latent heat reduces flue losses,
increases efficiency and saves energy dollars.

by Lochinvar

Intelli-Fin®Boiler Dimensions & Specifications

Standard Features

• Up to 97% Thermal Efficiency

• 25 - 100% Infinitely Proportional Firing Rate

• LonMark Building Management

System Compatibility

• Command Display - 21 Point

Diagnostic Control*

• Variable Frequency Drive

• Digital Temperature Control Accurate to 1ºF

• Alcromesh Burner with 5-Year

Limited Warranty

• Low NOx Operation Exceeds the most

Stringent Air Quality Requirements

• ASME Copper Finned Tube Heat Exchanger

• 160 PSI Working Pressure

• Gasketless Heat Exchanger Design

• Bronze Fitted Circulating Pump

Mounted and Wired

• Glass-Lined Water Surfaces

• Internal Stainless Steel Jacket

• Internal Corrosion Protection

• Low Gas Pressure Operation

• Zero Clearance to Combustible Materials

• Alarm Contacts on any Failure

• Contacts for Air Louver

• ASME Pressure Relief Valve

• Temperature and Pressure Gauge

• Down Stream Test Cock

• Adjustable High Limit w/ Manual Reset

• Flow Switch

• Small Footprint

Optional Equipment

• Alarm Bell

• Additional Command Display

• Cupro-Nickel Gasketless

Heat Exchanger

• High Gas Pressure Switch

w/ Manual Reset

• Low Gas Pressure Switch

w/ Manual Reset

• Outdoor Air Reset Control

• Low Water Cut-Off

• Neutralization Kit

• 4-20 mA Control

(Stand alone boilers only)

• Remote Mount Command Display

Firing Control Systems

M9 HSI (Standard)
M13 GE GAP/FM/IRI
M7 California Code

Registered under U.S. Patents # 6,428,312
and #6,619,951

Lochinvar Corporation • 300 Maddox Simpson Pkwy • Lebanon, TN 37090 • 615-889-8900 / Fax: [phone]

www.Lochinvar.com

7/09-Printed in U.S.A.

IFB-02 (Revised IFB-02 3/08)

• Whisper Quite Operation

• 24 Volt Circuit Breaker

• Pump Delay

• Freeze Protection

• Construction Air Filter

• Manual Operation Override

• 10 Year Limited Warranty on Heat Exchanger

(See warranty for details)

Monitoring Options

• Local Monitoring via Personal Computer

includes serial LonTalk adapter & serial cable

• Remote Monitoring via Personal Computer

includes serial LonTalk adapter, approved
network modem and adapter cable

Sequencing Options

• Standard Sequencing Package

First On/Last Off
First On/First Off with Lead-Lag

• Standard Sequencing with Outdoor Air Reset

or 4-20 mA Control

• Custom Sequencing Package:

Efficiency Optimization
Efficiency Optimization with
Run Time Equalization
First On/Last Off
First On/First Off with Lead-Lag

• Custom Sequencing with Outdoor Air Reset

or 4-20 mA Control

*Multiple boilers factory sequenced together

recieve one Command Display

Net

Model Input Output I=B=R Air Inlet Vent Shipping

Number MBH MBH MBH A D E F Size Size Wt. (lbs)

IBN1500 1,500 1,380 1,200 67-3/4” 52-3/4” 40-3/4” 4-1/2” 6” 6” 1,475
IBN1700 1,700 1,564 1,360 72-1/4” 57-1/4” 45-1/4” 4-1/2” 7” 7” 1,545
IBN2000 2,000 1,840 1,600 79” 64” 52” 6-1/2” 8” 8” 1,610

Note: Change ‘N’ to ‘L’ for L.P. Gas Model. No deration on LP models. Performance data based on manufacturer test results.
All gas connections are 1-1/2" NPT. All water connections are 3".

Intelli-Fin Boiler Dimensions & Specifications