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8

Midco International Inc.

8471 91

MADE

 in the 

USA

Part 1 - Installation

The Midco LNB is provided with all required gas train assembly components. Refer to piping diagram 
Figure 4A and 4B for a typical installation. Modifi cations can be made to the piping layout if required. 
The Ratio Regulator Zero Governor valve position CAN NOT be changed as this is critical in burner 
performance. The orifi ce located downstream from the Ratio Regulator Zero Governor valve must not 
be modifi ed. When the gas train assembly installation is complete turn on gas to the unit and check 
for any gas leaks. Repair any leaks that are found at this time. The minimum required gas pressure at 
the inlet of the valve train is 5″ W.C. and maximum gas pressure is 14″ W.C.. The outlet gas pressure 
should be set at 6″ W.C. when burner is at high fi re. Turn off  main manual gas valve before starting the 
unit. Consult the Midco technical support team if there are any piping questions. See Burner Startup, 
section V, for operating instructions.

III                Piping

Figure 4A - Piping - LNB 500 - Standard

PRE ASSEM BLED SECTION

EBM RG175/2000-3633 BLOWER

8435-30

BLOWER INLET KIT

8416-22

DUNGS 3/4" RATIO

GOVERNOR
8416-21

1" UNION

8493-06

3/4" QUICK

ACTUATED

BALL VALVE
8404-37

3/4" x 2" NIPPLE
8488-02

3/4" x 3" NIPPLE
WITH ORIFICE

5246-85

3/4" x 2"
NIPPLE
8488-02

3/4" SOLENOID
VALVE 24 V
8402-35

3/4" x 2"
NIPPLE
8488-02

3/4" T HAND
BALL VALVE
8404-30

3/4" REGULATOR
RV53
8416-01

3/4" SOLENOID

VALVE 24 V
8402-35

3/4" x 2" NIPPLE WITH
PRESSURE TAP
5243-29

3/4" x 3"
NIPPLE
8488-04

FUEL GAS

3/4" x 6"
NIPPLE
8488-15

3/4" ELBOW
8495-22

3/4" 
ELBOW
8495-22

3/4" x 3"
NIPPLE
8488-04

1/8" PIPE
PLUG

8496-00

BALANCE SHIPPED LOOSE

1" X 3/4" HEX
BUSHING

8492-52

MANOMETER

MAIN MANUAL GAS 

YELLOW

AND FLOW ARROW

REGULATOR ZERO

Chart 1 - Gas Pressure - LNB 1000 

1000

950
900
850
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100

50

0

0.00 0.10

2.20

2.10

2.00

1.90

1.80

1.70

1.60

1.50

1.30

1.20

1.10

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

1.40

FIRING RA

TE, MB

TU/HR

LNB 1000 FIRING RATE vs PRESSURE DIFFERENCE ACROSS

TWO SOLENOID VALVES

PRESSURE DIFFERENCE ACROSS TWO SOLENOID VALVES, “W.C.

Summary of Contents for LNB 1000 Series

Page 1: ... result in minor personal injury or product and property damage BURNER MODEL ______________________________________ BILL OF MATERIAL NUMBER ______________________________________ SERIAL NUMBER ______________________________________ WIRING DIAGRAM ______________________________________ FOR SERVICE CONTACT Name _______________________________________________ Address _________________________________...

Page 2: ...et 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 G...

Page 3: ...hamber 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 ...

Page 4: ...pens in high fire P30 Prepurging P36 Actuator closes to ignition position P38 Preignition Sparking P40 Ignition Gas valve on P44 End of safety time oP Operation modulating operation oP Present output FL Flame current Loc Lockout BLOWER MOTOR SPEED CONTROL W BL R Y BLOWER MOTOR POWER SUPPLY G R BK M 4 P74 Post purging G 6 9 4 BK BL TEMPERATURE CONTROL 0 10 VDC BL 7 BL X10 06 1 2 3 X10 05 2 1 4 5 X4...

Page 5: ...MADE in the USA Part 1 Installation 8471 91 Midco International Inc 5 Chart 1 Siemens Control Lock Codes Error Code List Siemens Control Lock Codes II Wiring Continued ...

Page 6: ...6 Midco International Inc 8471 91 MADE in the USA Part 1 Installation Chart 2 Siemens Control Display of Flame Current Siemens Control Display of Flame Current II Wiring Continued ...

Page 7: ... International Inc 8471 91 MADE in the USA Part 1 Installation __________________________________________ Chart 3 Siemens Control Sequence of Operation Siemens Control Sequence of Operation II Wiring Continued ...

Page 8: ...ner Startup section V for operating instructions III Piping Figure 4A Piping LNB 500 Standard PRE ASSEMBLED SECTION EBM RG175 2000 3633 BLOWER 8435 30 BLOWER INLET KIT 8416 22 DUNGS 3 4 RATIO GOVERNOR 8416 21 1 UNION 8493 06 3 4 QUICK ACTUATED BALL VALVE 8404 37 3 4 x 2 NIPPLE 8488 02 3 4 x 3 NIPPLE WITH ORIFICE 5246 85 3 4 x 2 NIPPLE 8488 02 3 4 SOLENOID VALVE 24 V 8402 35 3 4 x 2 NIPPLE 8488 02 ...

Page 9: ...E 600 0 MANOMETER EBM G1G170 AB05 20 BLOWER 8435 23 BLOWER INLET KIT 8416 18 DUNGS 1 RATIO REGULATOR ZERO GOVERNOR 8416 04 1 UNION 8493 06 1 x 3 NIPPLE 5246 64 1 x 2 NIPPLE 8488 52 1 SOLENOID VALVE 24 V 8402 36 1 x 2 NIPPLE 8488 52 1 T HAND MAIN MANUAL GAS BALL VALVE 8404 29 1 REGULATOR RV61 8416 33 1 SOLENOID VALVE 24 V 8402 36 1 x 4 NIPPLE WITH PRESSURE TAP 5243 46 1 x 3 NIPPLE 8488 61 FUEL GAS ...

Page 10: ...e inlet of first solenoid gas valve 27 Inlet pressure to side inlet of first solenoid gas valve at high fire should be 5 WC 28 Readjust main gas pressure regulator if required 29 Check differential gas pressure at barb fittings 30 Differential gas pressure should be 1 8 WC for high fire 31 To adjust high fire final setting the manual valve downstream of Dungs valve can be closed slightly LNB with Fenwal Co...

Page 11: ... barb fitting in order to hook up the required tubing to the differential gas pressure manometer Set temperature control below booth temperature so burner will light and stay lit at low fire or remove DCV wiring from RTC board Energize burner power switch The burner blower will be energized and start sequence will begin Once the main flame is established the burner will start at low fire The gas pressu...

Page 12: ...M blower ignition and flame sensing assembly burner chamber and burner head should be inspected Turn off the main gas manual valve and main panel disconnect to insure unit will not start Remove the flame sensor wire spark cable and wiring harness attached to the EBM blower To inspect the blower inlet loosen the union between the Ratio Regulator Zero Governor valve and blower Loosen the four 4 bolts a...

Page 13: ...ly 1 1 2 1 15 32 SIDE VIEW 13 Inside Collar 14 Figure 5 Direct Spark Ignitor Assembly FRONT VIEW NOTE Flame rod tip angled to the side FROM TIP TO TIP 5 32 0 01 GAP 6 5 4 3 2 11 10 9 8 7 12 1 Item Part Description Qty 1 Hardware 8 32 X 5 16 Socket Head Cap Screw 4 2 5246 45 Ignition Assembly Weldment Spk 1 3 8432 21 O Ring 1 2 X 11 16 X 3 32 1 4 5246 22 Ignition Flame Assembly Plate 1 5 5246 48 Ig...

Page 14: ... tag b Protected from shipping damage c Received transportation pre paid at Midco International Inc Return Goods Dept 4140 West Victoria Street Chicago Illinois 60646 6727 d Found by Midco s inspection to be defective in workmanship or materials under normal use and service e Handled in accordance with one of the two following procedures as specified by the customer making the return 1 Credit Proce...

Page 15: ... scrapped repaired or replaced as instructed by the customer Products returned to the customer will be sent shipping charges collect Call factory for information 866 705 0514 Fill out form and fax to 866 580 8700 or copy and mail to Midco International Inc 4140 West Victoria Street Chicago Illinois 60646 Date of Purchase End User Name Company Name Street Apt No City State Zip E mail Address Web Ad...

Page 16: ...inted in USA 8471 91 As an ISO 9001 certified company we proudly design manufacture and assemble our products in Chicago Illinois USA Midco International Inc 4140 West Victoria Street Chicago Illinois 60646 toll free 866 705 05148478 tel 773 604 8700 fax 866 580 8700 web www midcointernational com e mail sales midcointernational com 319 ...

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