12
Midco International Inc.
8471 91
MADE
in the
USA
Part 1 - Installation, Service & Part 2 - Maintenance
If Burner ignites
A. Ignitor will be de-energized
B. Check DC micro amps signal at ignition control sense terminal which needs to be
above 1.5 micro amps
C. LNB Burner will modulate based on 2-10 VDC signal from the temperature control
D. SCEBM-1 control LED will remain solid green if temperature control is calling for
2 DCV or higher
If Burner does not ignite
A. Igniter will be de-energized
B. LNB burner blower will go to maximum speed
C. SCEBM-1 control LED will slowly fl ash red.
D. Red light on ignition control will be fl ashing.
E. Power will need to be de-energized and reset.
For additional trouble shooting information contact Midco International as shown on front page.
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The LNB burner will require maintenance every 12-18 months depending on usage. There are
four components that should be inspected. The EBM blower, ignition and fl ame 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 fl ame 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) ½″ bolts attaching the burner to the
heater. This will allow removal of the Midco LNB burner. Inspect the heat chamber. To inspect the
burner head look into the heat chamber if any issue are found contact Midco for replacement. The
fl ame sensor and spark rod can be removed by loosening two nuts holding the ignition and fl ame
sensing assembly. To clean the sensor and spark rod use steel wool or sand paper. If the porcelain
is cracked then the sensor or igniter needs replacing. Reinstall the LNB burner and make sure gas
union and wiring were reinstalled. Open manual gas valve and reenergize heater and cycle as
shown in section IV - Burner Startup.
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VII Maintenance
VI Burner
Ignition Sequence
Continued
Part 2 - Maintenance
