3
Midco International Inc.
8471 91
MADE
in the
USA
Part 1 - 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.
II
Wiring
Figure 2 - LNB Burner Installation Guide - Typical Installation
OFFSET INSIDE
COLD AIR
HOT AIR
A
A
1/2 A
18"
or
More
Flame Exit
LNB Combustion Chamber
Heater Box
Ø10.000
Ø4.000
Side Profile
7" or More
24" or More
OFFSET OUTSIDE
FLAME EXIT
LNB
COMBUSTION
CHAMBER
HEATER BOX
18"
or
More
18"
or
More
18"
or
More
B
7" or More
COLD AIR
HOT AIR
24" or More
1/2 B
Ø10.000
Ø4.000
Notes:
1.
Above arrangements 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.
I
Installation
Continued
P
MV
5
ENCIRCLED: SPARK IGNITION
CONTROLLER
P# TERMINAL ON RTC BOARD
SOLID WIRING AND COMPONENTS BY MIDCO
LEGEND
OPEN ROUND: COMPONENT TERMINAL
SOLID ROUND: TERMINAL STRIP
WIRING AND COMPONENTS BY OTHERS
L1
L2
G
MAIN
VALVE
24V STEPDOWN
TRANSFORMER
120V
24V
RENDUNDANT
VALVE
120/1/60
HOT
NEUTRAL
GROUND
S1
SPARK ROD
W
P12
P10
P3
P1
S2
FLAME SENSE ROD
BK
W
Y
BL
BL
BL
BL
BL/W
BL/W
BR
BR
ORANGE
BL
MV1
IGNITION
TRANSFORMER
(120VAC)
(PILOT)
+
-
P2
2-10 VDC TEMPERATURE
CONTROLLER
(BY OTHERS)
P4
SUPPLIED BY MIDCO INSTALLED BY OTHERS
GND
8
6
G
5
7
BK
M
TO BLOWER
MOTOR
P9
P11
P13
G/Y
BK
BK
R
Y
BL
W
(V+)
(PWM)
(GND)
3
4
G
L1
BK
BK
3
W
W
4
BK
W
BR
P8
P7
(MAIN)
G
FUSED
DISCONNECT
SERIES CONNECT ALL SAFETY
AND / OR OPERATING CONTROLS IN
THE LINE (LINE
VOLTAGE ONLY)
WIRE NUT
24 V COIL
NO
NC
TIME DELAY
RELAY 60 SEC
24 V COIL
NO
NC
RELAY
7
L1
ALARM
2
(OPTIONAL)
Figure 3 - Wiring Diagram - 24 Volts
