2
Midco International Inc.
8471 91
MADE
in the
USA
Part 1 - Installation
Specifi cations
1
Part 1- Installation
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
for
opening size and mounting
information. The Midco LNB
burner should be centrally
located on a pull through
make up air unit to promote
even heat 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 should be 90
degrees to the blower. See
Figure 2 for proper chamber
orientation.
Clearance
around combustion chamber
must be a minimum of 6″ on
all sides.
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.
LNB With Chamber
LNB 500
LNB 1000
MIN VELOCITY ......................................
1000 FPM
1000 FPM
MAX VELOCITY ......................................
3500 FPM
3500 FPM
COMBUSTION AIR ................................. 125 CFM
250 CFM
* MIN CHAMBER INSERTION DEPTH ...... 4.5″
4.5″
* MAX CHAMBER INSERTION DEPTH ...... 25.0″
25.0″
FIRING RATE (NATURAL)
2
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 ............................................... 0.32 HP
0.40 HP
BLOWER FLOW RATE ............................. 125 SCFM
250 SCFM
ELECTRICAL SUPPLY ............................. 120 VAC/ 60 Hz / 10 AMPS
IGNITION CONTROL MODULE VOLTAGE .... 24 VAC - Standard (120V optional)
IGNITION TRANSFORMER ............................ 120 VAC
FLAME SAFETY .... Electronic fl ame Safety with Direct Spark Ignition and 100% Shut-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.
90°
90°
90°
90°
10.50 x 10.50
Opening for
Combustion
Chamber
Ø16.000
10.500
10.500
Ø0.500 X 4
15.000
LNB
Mounting Flange
15.000
11.319
11.319
Figure 1 -
LNB 1000 Mounting Flange
