Midco International Inc.
5
8471 15
MADE in the USA
Part 1 Installation
Burners are suitable for use with NATURAL or PROPANE gas only.
- If a standard NATURAL gas model is to be used with PROPANE gas, a conversion kit is available,
which contains a PROPANE Main Gas Port, a PROPANE Ignitor Tee Orifi ce Fitting and a PROPANE
label and conversion instructions.
- As shipped, the Air Shutter is in the full open position and the Main Gas Input Adjuster 5 to 6 turns
from full closed. Ignitor regulator is factory set for recommended outlet pressure of 3.5″ W.C. suitable
for most applications.
1. Check the burner piping and valves for gas leaks by applying a weak liquid soap solution to
unions and joints with the gas supply on. Leakage will be indicated by the appearance of soap
bubbles. Locate and correct all gas leaks before proceeding.
WARNING: DO NOT USE OPEN FLAME.
2. Confi rm that the main gas Input Adjuster is 5 to 6 turns from full closed and that the Blower Air
Shutter is fully open.
3. Close the Main Manual Shut-Off Valve.
4. Purging the air from the gas supply line at this step will expedite the fi rst light-off .
CAUTION: Purge outside the building. Do not purge into the incineration chamber.
5. Turn on the Fused Disconnect, Burner Switch or Timer. Let motor run long enough to accomplish
four air changes. Note that motor will continue to run after Electronic Control lockout occurs.
6. Open the incinerator or charging door. Making sure any Door Open interlock is temporarily
bypassed.
7. Turn off the Burner Switch or Timer for at least 30 seconds to reset Electronic Control (see
Section XIII ELECTRONIC CONTROL SYSTEM). Open the Main Manual Shut-Off Valve.
8. Turn on the Burner Switch or Timer. Burner Ignitor and main fl ame should light during the 6
second trial for ignition after the motor reaches operating speed. If the Ignitor and Main Flame fails
to light during the 6 second trial for ignition, it is probably due to air in ignitor gas line. Repeat from
step 7. Then, if necessary, refer to the Trouble Chart to isolate the problem.
WARNING: Repeated unsuccessful attempts to light will result in accumulated gases in
incineration chamber. To prevent these gases from reaching an explosive level, periodically
purge the incineration chamber as described in Step 5.
9. Observe the ignitor fl ame. If it is weak, screw in the Ignitor regulator adjustment to increase the
pressure. If it is excessively rich and large or fl oating from the ignitor tip, back off the regulator
adjustment to reduce the pressure. Set the ignitor to a stable blue fl ame which burns fi rmly within
the ignitor tip. Check fl ame current with a micro-ammeter and adjust Ignitor Regulator slowly for
highest steady 2 or more microamps.
CAUTION: When adjusting the regulator, take note of the supply pressure. If gas
supply pressure is below its specifi ed range during adjustment, an over-fi re condition
could result when pressure returns to normal, particularly if the regulator adjustment screw
is BOTTOMED OUT. ALWAYS confi rm that at least the minimum rated pressure is being
supplied to the ignitor during regulator adjustments, and NEVER BOTTOM OUT regulator
screw. Operate air shutter throughout range to confi rm Ignitor stability. Try several relights.
Refer to Figure 4.
10. Remove the input adjuster cap (see Figure 3) 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 fl ow; clockwise reduces fl ow.
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 fl ame 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 fi ring 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*
= 180,000 BTU / Hr. = 180 MBH
20
* Approximate BTU Value
VII Initial Start
Up/Adjustment
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