Midco J83-DS - Manual (Page 7)

VII Initial Start Up /
Adjustment
Continued
10. Remove the input adjuster cap (see Figure 4) and, with the Ignitor and Main Flame on,
turn the Main Gas Input Adjusting Screw (see Figure 4) until the desired input rating is
reached (refer to Table 2). Turning of adjustment screw counterclockwise increases gas
flow; clockwise reduces flow. If Main Flame gas pressure requires adjustment, refer to
Section V Piping Supply.
11. Reset the Blower Air Shutter to match the intended input, i.e.; full open for maximum,
closed for minimum or partially open for midrange. The Blower Air Shutter is factory set
wide open. Adjust as necessary when, with combustion air available in the incineration
chamber, it is desirable to increase the flame length, or to restrict the amount of excess
air discharged into the incineration chamber when the burner input is below 450 MBH.
12. The actual NATURAL gas firing rate in BTU per hour can be determined by timing the
gas meter. Accurately time the meter test dial for one revolution, convert to hourly
cubic feet and multiply by the BTU per cubic foot value of your gas per formula:
3600 x test dial size x BTU value
= BTU/Hr.
No. of seconds for one rev. test dial
Then divide by 1,000 for MBH value.
Example:
3600 x 1 x 1000*
= 360,000 BTU/HR = 360 MBH
10
*Approximate BTU value
13. Start and stop the burner several times to check its operation with the charging door
open, and then with it closed. Remove any temporary Door Open bypasses installed in
Step 6.
14. Test operation of any auxiliary operating and/or limit controls.
15. Load incinerator and make trial run. Confirm 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
control is used, check that there is no spillage of flue products from the draft
control.
17. To shut off: Turn Burner Switch or Timer off and close Main Manual Shut -Off Valve
WARNING: BE SURE THAT THE MANUAL VALVE AND BURNER
DISCONNECT SWITCH ARE TURNED OFF BEFORE ANY PARTS ARE
REMOVED FOR SERVICE.
_________________________________
The Ignitor and Regulator Assembly is removed as a unit. Disconnect the ignitor gas line and
electrode wires, remove the two mounting screws and pull out the assembly.
„ When the ignitor gas pressure is in the proper range (see Table 3) and the electrodes are
adjusted to the dimensions shown in Figure 5, any ignition problems are usually caused by
lint, dust, corrosion, cracked electrode insulators, foreign matter in the blast tube or deterio-
ration of ignitor ports in Retention Plate.
7
Part 1 Installation
Part 1 Service
VIII Ignitor &
Regulator
Assembly
Figure 4: General Burner Head Assembly