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*

Our Enhanced Models Raise The Bar...Again

Our enhanced Copper-Fin II models offer the same reliable,
efficient operation and feature a more service friendly design.
The gas inlet and shutoff cocks, electrical and BMS connections
have been repositioned toward the front of the unit for easier
service access and simpler installation. And the new referenced
gas valve design improves operational performance by
monitoring the pressure in the sealed combustion chamber to
maintain the optimum air/fuel mixture.

All models feature alternate air
inlet connections for greater
installation flexibility. This field
convertible option provides the
ability to connect the air inlet on
either the right side or the rear
of the unit. 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.

You’ll also save installation time and expense with Lochinvar’s
direct vent option, featuring our innovative Aire-Lock™
combustion system. The direct vent option allows the installer
to vent the by-products of combustion directly through a side
wall without the use of an auxiliary draft inducer. By using
approved vent material and an air intake pipe, this option
effectively “detaches” the unit from the mechanical room by
pulling all combustion air from outside the building and venting
all combustion by-products outside through a side wall. A
feature that can really simplify an installation while reducing
overall installed costs.

Referenced gas valves
and shutoff cocks are
in the upper deck for
easier access. And our
Lochinvar exclusive
“Aire-Lock” transition
ducts provide a
positive path for the
sealed combustion
system that does not
require the upper
chamber panel to be
installed allowing for
accurate adjustment
during operation.

All BMS
connections
are on the front
portion of the
unit and have
been designed for
easier access and
connection.

Venting Options

Conventional

Vents into conventional
flue or vent breaching
using Type B double wall
vent.

Aire-Lock Direct Vent

Utilizes sealed Aire-Lock combustion
system to draw fresh air 50 equivalent feet
from a sidewall. Vents horizontally up to
50 equivalent feet through the sidewall
using Category IV approved vent material.

Powered Sidewall

Vents directly through the
outside wall using an optional
powered sidewall cap. Ideal
when a vent stack is not
practical.

Outdoor

Requires optional outdoor
vent cap. Use when indoor
space is a problem or if
outdoor location gives
better access.

Power DirectAire Horizontal

Draws fresh air from outside
and vents through sidewall
using optional powered
sidewall cap.

Sidewall (CH 401-751)

Draws fresh air from inside the room.
Vents

up to 50 equivalent feet
through the outside wall
IV approved vent material.
require a powered sidewall cap.

directly

using Category

Does not

DirectAire Vertical
with Sidewall Inlet

Draws fresh air from
outside and vents
through conventional
vertical flue.

DirectAire Vertical

Draws fresh air from
outside and vents
through conventional
vertical flue.

Copper-Fin II® Boiler Dimensions & Specifications

Copper-Fin II Heating Boiler Dimensions & Spec i fi ca tions

Net
Model Input Thermal Output I=B=R Vent Air Gas Shipping
Number MBH Efficiency MBH MBH A B C D E F G H J K L Size Inlet Conn Weight

CHN401 399 85% 339 291 31-1/2” 37-3/4” 22-1/4” 12-1/2” 7” 7” 29” 23-1/2” 8” 6-1/2” 30-3/4” 6” 6” 1-1/4” 378
CHN501 500 85% 425 365 31-1/2” 45-1/2” 22-1/4” 12-1/2” 7” 7” 29” 23-1/2” 8” 6-1/2” 30-3/4” 6” 6” 1-1/4” 414
CHN651 650 85% 553 475 31-1/2” 56-3/4” 22-1/4” 12-1/2” 8-1/2” 8-1/4” 29” 23-1/2” 8” 6-1/2” 30-3/4” 8” 8” 1-1/4” 500
CHN751 750 85% 638 548 31-1/2” 64” 22-1/4” 12-1/2” 8-1/2” 8-1/4” 29” 23-1/2” 8” 6-1/2” 30-3/4” 8” 8” 1-1/4” 543
CHN0991 990 85% 842 723 36” 48-1/4” 33-1/2” 15-3/4” 8” 9-1/4” 33-3/4” 27” 9-1/4” 9” 41-3/4” 10” 10” 2” 773
CHN1261 1,260 85% 1,071 920 36” 58-1/2” 33-1/2” 15-3/4” 10-1/4” 10” 33-3/4” 27” 9-1/4” 9” 41-3/4” 12” 12” 2” 863
CHN1441 1,440 85% 1,224 1,052 36” 68-3/4” 33-1/2” 15-3/4” 10-1/4” 10-1/2” 33-3/4” 27” 9-1/4” 9” 41-3/4” 12” 12” 2” 965
CHN1801 1,800 85% 1,530 1,315 36” 82-1/4” 33-1/2” 15-3/4” 10” 11-1/2” 33-3/4” 27” 9-1/4” 9” 41-3/4” 14” 12” 2” 1,100
CHN2071 2,070 85% 1,760 1,512 36” 92-1/2” 33-1/2” 15-3/4” 10” 11-1/2” 33-3/4” 27” 9-1/4” 9” 41-3/4” 14” 12” 2” 1,219

Notes: Change ‘N’ to ‘L’ for LP gas models. No deration on LP models Water connections for models CH 401-751 are 2” NPT on 6-1/2” centers.
Header increases “B” dimension 3-1/2” for models CH 401-751 and 6-1/4” for models CH 0991-2071
Performance data is based on manufacturer test results.

Standard Features

• 85% Thermal Efficiency

• ASME Copper Finned Tube Heat Exchanger

• Gasketless Heat Exchanger Design

• Proportional Firing

• Built-In Sequencer with up

to 4 stages of operation

• Adjustable High Limit w/ Manual Reset

• Built-in System Redundancy

• 24 Volt Control System

• Temperature & Pressure Gauge

• BMS Terminal Strip

• Down Stream Test Valves

• 10 Year Limited Warranty

on Heat Exchanger
(See warranty for details)

• Digital Operator Interface Panel

• Sealed Combustion Chamber

• Stainless Steel Burners

• Low NOx Operation Exceeds the

most Stringent Air Quality Requirements

• 160 PSI Working Pressure

• Loch-Heat Ceramic Tile

Combustion Chamber

• Hot Surface Ignition

• ASME Pressure Relief Valve

• Referenced Gas Valves

• Flow Switch

• PID Temperature Control

• Combustion Air Filter

• Freeze Protection

• Field Convertible Air Inlet Connection

• Pump Relay w/ Delay

Optional Equipment

• Alarm Bell

• Contacts for Air Louvers

• Contacts on any Failure

• Cupro-Nickel Heat Exchanger

• High Gas Pressure Switch

w/ Manual Reset

• High & Low Gas Pressure Switch

w/ Manual Reset

• Indoor/Outdoor Reset

• Manual Reset Low Water Cut-Off

w/test

• MP2 Sequencer

• Stack Frame

• Combustible Floor Shield (CH 401-751)

Water connections for models CH 0991-2071 are 2-1/2” NPT on 11-1/4” centers.

Venting Options

• Aire-LockTM Direct Vent Sealed Combustion

• DirectAire® Vertical

• DirectAire® Vertical w/ Sidewall Inlet

• Outdoor Installation

• Power DirectAire® Horizontal

• Powered Side Wall

• Sidewall (CH 401-751)

Firing Controls

M9 Hot Surface Ignition with Electronic
Supervision (Standard)
M13 GE GAP/FM/CSD1 (CH 501-2017)
M7 California Code

Registered under U.S. Patent #5,989,020

For Ease In Ordering By Model Number

CH N 501 M9

FUEL TYPE

MODEL

This heater is 500,000 Btu/hr natural gas

®

Copper-Fin

II boiler. It has M9 firing controls.

Btu/hr

INPUT

FIRING

CONTROLS

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

CHN-09 (Replaces CHN-08 8/08)

www.Lochinvar.com

FG-5M-3/10– Printed in U.S.A.