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10

Midco 

International

 Inc.

8471 15

MADE

 in the 

USA

Part 2 Service

The  Electronic  Control  is  a  24  volt AC,  solid  state  electronic  device  that  automatically  ignites  and 
monitors the fl ame. It has an integral high voltage transformer and, upon fl ame startup, applies high 
voltage to the spark electrode and 24V to the Main Automatic Gas Valve. When the fl ame is proven, 
the spark is terminated and the burner run continues.

- If the fl ame is not proven within 6 seconds, or if the proof of fl ame is lost during the burner run and 
not re-established within 6 seconds, the Control will shut off  the Main Automatic Gas Valve and LOCK 
OUT. To reset the Control for restart, turn off  the Burner Switch or Timer for at least 30 seconds and 
then turn back on.
- If the Electronic control is changed, the replacement must be identical as to the make and model 
number, or must be an authorized substitute.

 

 

WARNING: Explosion hazard. Do not use this device if it gets wet. It can malfunction 

and cause serious injury or death. Replace any device that has been wet.

 
 

  

 

 

 

    __________________________________________

XIII  Electronic 

Control System

Figure 4 

General Burner Assembly

Figure 5

 Ignitor and Flame Sensor Assembly

Summary of Contents for J121-DS

Page 1: ...witch 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 re departmen...

Page 2: ...d air at sea level with zero draft over re De rate burner for altitudes over 2 000 feet by 4 for each 1000 feet of additional elevation 4 100 MBH 100 000 BTU Hr No 1 Waste Primarily dry material such...

Page 3: ...MIDCO Accessory Weatherhood will provide such protection CAUTION If the incinerator is of the down draft design make sure that a direct draft vent opening of approximately 10 square inches has been p...

Page 4: ...en pressure testing the supply piping the burner valve train must be protected If the test pressure is 0 5 PSIG or less closing the Main Manual Shut O Valve will su ce CAUTION If the test pressure is...

Page 5: ...t these gases from reaching an explosive level periodically purge the incineration chamber as described in Step 5 9 Observe the ignitor ame If it is weak screw in the Ignitor regulator adjustment to i...

Page 6: ...Load incinerator and make trial run Con rm that the incineration chamber pressure stays within the range of 0 to minus 0 5 W C 16 WARNING When the incinerator is located inside a building and a draft...

Page 7: ...Midco International Inc 7 8471 15 MADE in the USA Part 1 Installation VII Initial Start Up Adjustment Continued Figure 2B Wiring diagram 6455 58 Figure 3 Control Components SCHEMATIC LEGEND...

Page 8: ...is no debris in the Blast Tube that could short out the Spark or Flame Electrode Clean the Ignitor Gas Ori ce in Tee Ori ce Fitting see Figure 5 and check that the ori ce size is correct per Table 3 C...

Page 9: ...nt screw __________________________________________ The valve is a single function on o type with automatic closing on current failure Replace entire valve if valve fails to open when power is applied...

Page 10: ...uring the burner run and not re established within 6 seconds the Control will shut o the Main Automatic Gas Valve and LOCK OUT To reset the Control for restart turn o the Burner Switch or Timer for at...

Page 11: ...trial for ignition 1 Check for 24V between Electronic Control Valve terminal and strip terminal 10 No volt age Electronic Control or Fuse is defective 2 Check for 24V between strip terminals 7 and 10...

Page 12: ...ls L2 and GND TERM no volt age no back feed neutral OK B Follow test procedure as speci ed in Step II G 1 Connect DC microamp meter in series with sense wire and Electronic Control SENSE terminal With...

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