Midco LNB1000 Service Manual

Installation and Service Instructions

LNB 1000

WARNING: If the information in these instructions
is not followed exactly, a fi re or explosion may result,
causing property damage, personal injury or death.

• In the United States, installation must conform with local codes
or in the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1-latest edition available from American
National Standard Institute. Further reference should be made
to the recommendation of your fuel supplier.

• WARNING: Additions, changes, conversions and service
must be performed by an authorized Midco representative,
service agency or the fuel supplier. Use only MIDCO speci­fi ed and approved parts.

• INSTALLER: Inform and demonstrate to the user the correct
operation and maintenance of the gas utilization equipment.
Inform the user of the hazards of storing fl ammable liquids
and vapors in the vicinity of this gas utilization equipment and
remove such hazards. Affi x this manual and associated
literature to the burner or equipment.

• CODE COMPLIANCE IS THE SOLE RESPONSIBILITY OF
THE INSTALLER.

• USER: Retain this manual for future reference. If other than
routine service or maintenance as described in this manual
and associated literature is required, contact a qualifi ed service
agency. DO NOT ATTEMPT REPAIRS. An inadvertent service
error could result in a dangerous condition.

AVOID ERROR IN PARTS SELECTION. When ordering use complete
MIDCO Part Number and Description. Furnish Burner Model Number,
Bill of Material Number and Date Code (if available) from the specifi ca­tion plate found on the product
IMPORTANT: Availability of parts as well as specifi cations are subject
to change without notice. Please consult factory for item availability.

LNB 500 &
LNB 1000 Series

Low NOx Burners

Do not store or use gasoline or other fl ammable vapors and liquids in
the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any
phone in your building.

• Immediately phone your gas supplier from another
building. Follow the gas supplier’s instructions. If
you cannot reach your gas supplier call the fi re
department.

Installation and service must be performed by a qualifi ed installer,
service agency or the gas supplier.

BURNER MODEL: _____________________________________

BILL OF MATERIAL
NUMBER: _____________________________________________

SERIAL NUMBER #: ____________________________________

WIRING DIAGRAM: ___________________________________

FOR SERVICE CONTACT

Name: ________________________________________________

Address: ________________________________________________

________________________________________________

Phone: ________________________________________________

Date of Installation: _______________________________________

Midco® International Inc.
4140 West Victoria Street
Chicago, Illinois 60646
tel [phone]
fax [phone]
web www.midcointernational.com
e-mail [e-mail]

SAFETY INFORMATION TERMS: The following terms are used to identify hazards, safety precaution of special
notations and have standard meanings throughout this manual. They are printed in all capital letters using a bold
type face as shown below, and preceded by the exclamation mark symbol. When you see the safety alert symbol
and one of the safety information terms as shown below, be aware of the hazard potential.
DANGER: Identifi es the most serious hazards which will result in severe personal injury or death.
WARNING: Signifi es a hazard that could result in personal injury or death.
CAUTION: Identifi es unsafe practices which would result in minor personal injury or product and
property damage.

Quality Designed for Proven Performance

8471 91

Printed in USA

914

Part 1 - Installation

Specifi cations

1

The LNB Series burners are adaptable to most makeup air units, ovens and after burners. The
Midco LNB Series LOW NOx Series gas burner was developed to meet the changing emission
requirements required today.
With Chamber
LNB 500 LNB 1000
MIN VELOCITY 1000FPM 1000 FPM
MAX VELOCITY 3500 FPM 3500 FPM

* MIN INSERTION DEPTH 4.5″ 4.5″
* MAX INSERTION DEPTH 25.0″ 25.0″

2

FIRING RATE (NATURAL)

LNB 500 LNB 1000
Push Through Pull Through Push Through Pull Through
MIN MBH 3 100 125 150 225
MAX MBH 3 500 500 1000 1000

GAS SUPPLY PRESSURE REQUIRED

NATURAL ................................................. Min 5.0″ W.C. Max 14.0″ W.C.

PROPANE ................................................. Contact factory

LNB 500 LNB 1000
MOTOR HP - AMPS 0.32 HP 0.40 HP
CFM BLOWER 229 SCFM 361 SCFM

ELECTRICAL SUPPLY..................................................... 120 VAC/ 60 Hz / 5 AMPS

Standard 120V optional

IGNITION CONTROL MODULE VOLTAGE .................... 24 VAC - Standard 120V optional

IGNITION TRANSFORMER ............................................ 120 VAC

FLAME SAFETY ....

Electronic fl ame Safety with Spark Ignited Pilot and 100% Sut-Off 4

Table 1. Burner Specifi cations

* Consult factory for optional insertion depth

1

Standard burners are shipped as NATURAL gas models. Consult Midco for propane applications.

2

All Ratings Based on 1000 BTU/Cu. Ft. NATURAL gas, at sea level.

3

1 MBH = 1,000 BTU/hr. , Min MBH depends on system velocity.

4

See Section VI Burner Ignition Sequence.

Part 1- Installation

2

When installing the Midco LNB burner the following instructions must be followed.

The Midco LNB Burner must be installed per the equipment manufacturer’s instructions. If not available
take the following steps. To install the burner an opening on the side or top of the heater must be

provided. See Figure 1
be centrally located on a
pull through make up air
unit to promote even heat

for opening size and mounting information. The Midco LNB burner should

15.000

11.319

10.500

distribution. For a push
through unit the Midco
LNB burner should be
located in the center of
the blower discharge. For
other applications contact
our sales engineering
team. The opening of
the combustion chamber

15.000

11.319

10.500

90°

90°

90°

LNB
Mounting Flange

Ø16.000

10.50 x 10.50
Opening for
Combustion
Chamber

should be 90 degrees to
the blower. See Figure 2 for
proper chamber orientation.

90°

Clearance around heat
chamber must be a
minimum of 6″ on all sides.

Ø0.500 X 4

Figure 1 -

Midco International Inc.

LNB 1000 Mounting Flange

8471 91

Part 1 - Installation

OFFSET INSIDE

HOT AIR

Ø10.000 Ø4.000

A A

1/2 A

Side Profile

LNB Combustion Chamber

Heater Box

Notes:

1. Above arrangement are for both push through and pull through units.

2. If the width or height of the combustion chamber is more than 28", a bottom profile plate may be required.

3. Any component, for example motor, blower, baffle, etc., should be 18" away from the chamber.

4. 3 o'clock arrangement is preferred.

5. For more information or special requirement please contact our Midco sales engineering team.

COLD AIR

24" or More

7" or More

Flame Exit

18"

or

More

18"

or

More

OFFSET OUTSIDE

Ø10.000 Ø4.000

1/2 B

LNB
COMBUSTION
CHAMBER

HEATER BOX

HOT AIR

COLD AIR

24" or More

B

7" or More

FLAME EXIT

18"

or

More

18"

or

More

Figure 2 - LNB Burner Installation Guide - Typical Installation

__________________________________________

The Midco LNB wiring is included with the burner. Follow wiring diagram included with the burner for
proper wiring connections. When installing the Midco LNB burner all safety and operating controls
must be included and connected so if any safety fails the LNB burner will not operate. Do not bypass
any safety or operating control or equipment might be damaged.

LEGEND

SOLID WIRING AND COMPONENTS BY MIDCO

WIRING AND COMPONENTS BY OTHERS

SUPPLIED BY MIDCO INSTALLED BY OTHERS

MV

ENCIRCLED: SPARK IGNITION
CONTROLLER

5

SOLID ROUND: TERMINAL STRIP

OPEN ROUND: COMPONENT TERMINAL

P# TERMINAL ON RTC BOARD

P

WIRE NUT

2-10 VDC TEMPERATURE
CONTROLLER

+

-

(BY OTHERS)

P2

P4

SPARK ROD

SERIES CONNECT ALL SAFETY
AND / OR OPERATING CONTROLS IN
THE LINE (LINE

FUSE

VOLTAGE ONLY)

DISCONNECT

120/1/60
HOT

NEUTRAL

L1

L2

FLAME SENSE ROD

IGNITION
TRANSFORMER

BK

24V STEPDOWN
TRANSFORMER

BK

120V

W

RENDUNDANT
VALVE

MAIN
VALVE

BR

24V

4

3

BL

W

W

G

P7

(MAIN)

P8

G

S2

P10

(PILOT)

P12

P3

(120VAC)

P1

GND

MV1

S1

W

BK

2

BL

Y

8

BL

BL

7

BL/W BL/W

5

ORANGE

BL

BR BR

6

BK BK

L1

W

I Equipment

Preparation

Continued

II Wiring

GROUND

BK

3

BK

4

G/Y

G

G

M

TO BLOWER
MOTOR

W

R

P9
P11
P13

(V+)
(PWM)
(GND)

Y

BL

ALARM

24 V COIL

NO

NC

TIME DELAY
RELAY 60 SEC

(OPTIONAL)

Figure 3 - Wiring Diagram

__________________________________________

8471 91

Midco International Inc.

24 V COIL

NO

NC

RELAY

7

L1

3