The Incinomite Model J83-DS incinerator gas burner features direct main flame spark ignition and solid state electronic flame
verification. It is adaptable to either primary or secondary chamber installations.
In the United States, installation must conform with local
codes or, in the absence of local codes, with National
Fuel Gas Code, ANSI Z223.1-latest edition available
from American National Standard Institute. Further reference should be made to the recommendation of your
fuel supplier.
NOTE: Any additions, changes, or conversions required in
order for the gas utilization equipment to satisfactorily
meet the application needs must be made by a MIDCO
distributor (or other qualified agency) using factory
specified and approved parts.
In Canada, installation must conform with local codes or,
in the absence of local codes, with Installation Codes
for Gas Burning Appliances and Equipment, CGA
Standard CAN/CGA 1-B149.1 or 2. Further reference
should be made to the recommendation of your fuel sup
plier.
CODE COMPLIANCE IS THE SOLE RESPONSIBILITY
OF THE INSTALLER.
INSTALLER: Inform and demonstrate to the user the
correct operation and maintenance of this gas utilization equipment. Inform the userof the hazards of storing flammable liquids and vapors in the vicinity of this
gas utilization equipment and remove such hazards.
Affix this manual adjacent to the incinerator burner.
WARNING: If the information in
these instructions is not followed
exactly, a fire or explosion may result,
causing property damage, personal
injury or death.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical
switch; do not use any phone in
your building.
• Immediately call your gas
supplier from a neighbor's
phone. Follow the gas suppliers'
instructions.
• If you cannot reach your gas
supplier, call the fire department.
USER: Retain this manual for future reference. If other than routine service or maintenance
as described in this manual is required, contact a qualified service agency. DO NOT
ATTEMPT REPAIRS. An inadvertent service error could result in a dangerous condition.
SAFETY INFORMATION TERMS: The following terms are used to identify hazards, safety precautions or special
notations and have standard meanings throughout this manual. When you see the safety alert symbol and one of the
safety information terms as shown below, be aware of the hazard potential.
DANGER: Identifies the most serious hazards which will result in severe personal injury or death.
WARNING: Signifies a hazard that could result in personal injury or death.
CAUTION: Identifies unsafe practices which would result in minor personal injury or product and property damage.
Installation and Service Instructions
Midco®International Inc.
4140 West Victoria Street Chicago, Illinois 60646-6727
tel 773.604.8700 fax 773.604.4070
web www.midco-intl.com e-mail sales@midco-intl.com
602
8470 23
Printed in USA
Incinomite J83-DS
Incinerator Gas Burner
Quality Designed for Proven Performance
Part 1 Installation
Specifications
1
II Indoor Ventilation
No. 1 Waste: Primarily dry material such as paper, rags and wood. Burner normally required only
for light-off.
No. 2 Waste: Consisting of approximately equal portions, by weight of No. 1 and No. 3 waste; 70
lbs. per 100 MBH.
No. 3 Waste: Wet material such as garbage; 25lbs. per 100 MBH.
No. 4 Waste: Organic materials such as small carcasses and waste from hospital operating rooms
or pathological laboratories; 13 lbs. per 100 MBH.
NOTE: The burner input required for the secondary chamber must be determined from the heat
required to maintain the discharge temperature of the flue products as specified by the EPA for the
type of waste involved and the location of the incinerator.
_________________________________
Make sure that the incinerator room has sufficient ventilation to provide the necessary combustion
air for the burner fuel, the waste material and any other appliance that would draw its air from the
same enclosed area.
WARNING: Under no condition should the access to outside air be so restricted that the
maximum possible use of combustion air is inhibited. Pay particular attention to exhaust
fans that could draw air from the area and create a negative pressure in the room.
_________________________________
Install the INCINOMITE burner(s) in location(s) specified by the incinerator manufacturer. It should
be positioned approximately level with the top of the highest normal load and fire with or across the
draft flow.
If the incinerator is designed only for No. 4 waste, the level can be lowered to bring the flame to
fire directly on the smaller loads characteristic of this type of operation. The opening through which
the burner fires should be of a diameter only large enough to accommodate the Blast Tube (4 ¼"
diameter x 3" minimum long.) Do not allow the Blast Tube to protrude into the incineration chamber. If necessary, build an extension outside of the incinerator wall to increase wall depth.
2
Air Delivery
(Approximate Air Delivery at Zero Draft) 90 SCFM
2
Minimum Gas Pressure Listed for Purpose of Input Adjustment
(Take Pressure at Inlet Tap of Main Automatic Valve)
NATURAL 5.5” W.C.
PROPANE 8.0" W.C.
Burner Firing Rate (NATURAL OR PROPANE)
3
All Ratings Based on 1000 BTU/cu. ft. NATURAL, 2500 BTU/cu. ft. PROPANE at Sea Level
Minimum 100 MBH
4
Maximum (With Combustion Air From Burner Only)
20% Excess Air 450 MBH
0% Excess Air (stoichiometric) 540 MBH
Maximum
(With Combustion Air From Burner Blower and
Additional Air Available in Combustion Chamber)
NATURAL Gas 5.5" W.C. or PROPANE Gas at
11.0" W.C. Gas Pressure at Main Automatic Valve 800 MBH
Electrical Supply 120/1/60; 3 amps
Burner on-off Control Toggle Switch. Optional 0 to 6 Hr. Manual Timer
5
Flame Safety Electronic Flame Safety with spark ignited ignitor
(pilot) and 100% shut-off.
Optional Weatherhood
5
Adjustable Firing Angle Mounting Flange adjustable for horizontal or 10°
down firing.
NOTE: Burner components are UL recognized, CGA listed, CSA certified and/or
AGA design certified, mounted and wired. The complete burner is fire tested.
1. Standard burners are shipped as NATURAL gas models or are avaiable built for PROPANE
gas. Or a kit is available for field conversion to PROPANE gas.
2.
SCFM = Standard Cubic Feet/Minute.
3. NOTE: Firing rate with combustion air from burner blower only is based on using standard air at
sea level with zero draft overfire. Derate burner for altitudes over 2,000 feet by 4% for each
1000 feet of additional elevation.
4. 100 MBH = 100,000 BTU/Hr.
5. Kit is available for field installation.
I Primary Chamber
Fuel Input
III Installation
Part 1 Installation
Part 1
Installation
Continued
IV Chimney, Vent
Connector *
and Draft Control
*Formerly referred
to as Flue Pipe
3
To change the Mounting Flange to its alternate position, horizontal or 10° down firing, remove
the four (4) screws that attach it to the burner, rotate the flange 180° and reinstall the screws.
Before mounting the burner, check that the Blast Tube and Blower Housing are clear of foreign
material and that the Main Gas Port and Nozzle Support is clean and undamaged.
If the incinerator is located outdoors, the burner and all of its components, except the Main
Manual Shut-Off Valve, must be protected from weather. The 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 put through the top of the drop
section(s) to provide for the venting of any gas leakage. See Figure 1.
_________________________________
The size and type of material used for the vent connector and chimney must conform to the recommendations of the incinerator manufacturer, as well as local and national codes. This is especially true where high flue gas temperatures are encountered.
When natural draft is used and the chimney height is over 25 feet, a barometric damper of the
same size as the vent connector should be installed. If the chimney is high enough to make it difficult for the barometric to maintain a maximum incineration chamber over-fire draft, 0 to minus
0.5" W.C., a fixed damper should be installed in the vent connector between the barometric and
chimney to restrict the chimney draft to a point within the controlling capacity of the barometric.
After final setting, the damper should be permanently fastened into position per ANSI Z223.1-latest edition "National Fuel Gas Code", or latest edition available from American National
Standards Institute to prevent tampering.
_________________________________
The supply piping to the burner should branch off from the main line as close to the source as
possible (NATURAL gas meter or
PROPANE tank regulator). When
branching off from an existing gas
line, do not tap o ff the bottom of a
horizontal section. Use new black
pipe and malleable fittings free
from cutting and threading burrs or
defects.
Use pipe joint compound resist-
ant to liquid petroleum gases
when using either NATURAL or
PROPANE gas. Piping must comply with the local and national
codes. If the burner piping must be
rearranged because of space limitations, be sure to carry out the
general configuration shown in
Figure 2.
Figure 1: Typical Installation
V Piping
Capacities shown are for total pressure drop of 0.3”W.C. For
higher permissible pressure drops consult your fuel supplier.
Source: Gas Engineers Handbook-1974
Industrial Press Inc. NY, NY
Table 1: Supply Pipe Capacities in MBH
Type
of
Gas
NATURAL
PROPANE
NATURAL
PROPANE
NATURAL
PROPANE
NATURAL
PROPANE
NATURAL
PROPANE
10
275
450
520
800
800
-
-
-
-
-
20
200
300
350
550
730
800
800
-
-
-
40
130
200
245
385
500
790
760
800
800
-
60
100
165
195
300
400
630
610
800
800
-
100
-
125
150
235
300
480
460
725
800
800
NPT
Pipe
Size
3/4"
1"
1-1/4"
1-1/2"
2
Approximate Capacity - MBH
Length of Pipe / Feet
A suitable Main Gas Pressure Regulator should be installed as shown in Figures 1 or 2
Choose a regulator(s) to adjust the available gas pressure to the pressure shown in SPECIFICATIONS, page 2.
CAUTION: The regulated gas pressures must not exceed 14"W.C. or Main
Automatic Gas Valve and Ignitor Regulator will be damaged. If excessive gas pressure
is prevalent, the regulator must be a tight shut-off type to prevent high pressures from
developing during stand-by.
4
Part 1 Installation
Table 2: Firing Rate Curves
V Piping Continued
PROPANE Gas
2,500 BTU / Cu. Ft.
(with 5/8" Main Gas Port)
NATURAL Gas
1,000 BTU / Cu. Ft.
(with Main Gas Tube
only, no Gas Port)
Manifold Gas Pressure in Inches W. C.
Input in MBH
Input in MBH
Input Adjuster Setting in Number of Turns From Full Closed
Input Adjuster Setting in Number of Turns From Full Closed
Manifold Gas Pressure in Inches W. C.
Part 1
Installation
Continued
For full input, refer too SPECIFICATIONS, page 2, for minimum gas pressure required. For
reduced capacities, refer to Firing Rate Curves, Table 2.
CAUTION: If gas supply pressure is below its specified range during adjustment,
an over-fire condition could result when pressure returns to normal, particularly if the
regulator adjustment screw is bottomed out. ALWAYS confirm that at least the minimum rated pressure is being supplied during regulator adjustments, and NEVER BOTTOM OUT regulator screw.
When selecting the burner supply piping size per Table 1, the permissible pressure drop
must be based on the pressure available at the inlet to the supply pipe branch line when all
other gas equipment fed by the same source (NATURAL gas meter or PROPANE tank regulator) is firing at full rate. Also take into account any other INCINOMITE burners to be
attached to the same branch line.
When 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-Off Valve will suffice.
CAUTION: If the test pressure is over 0.5 PSIG, the test must be made without any
burner components connected.
DANGER: EXPLOSION HAZARD. DO NOT USE OXYGEN FOR PRESSURE
TESTING. AN EXPLOSION COULD OCCUR DURING INITIAL START-UP.
5
Part 1 Installation
Figure 2: Control Components
Figure 3: Wiring Diagram
_________________________________
Installation wiring to the burner must conform to local codes, or, in their absence in the United
States the National Electric Code ANSI/NFPA No. 70- latest edition; in Canada, to CSA standard C22.1, "Canadian Electrical Code Part 1."
Use copper wires and provide disconnect and fuse protection for each INCINOMITE instal-
lation. Refer to SPECIFICA TIONS, page 2, for amp acity. Confirm that the polarity is correct—
hot wire to strip terminal L1, neutral L2 and that the neutral line is not subject to induced low
voltage (check L2 to ground) from other equipment as that can affect the flame safeguard,
causing it to malfunction.
The frame of the burner should be well grounded. A terminal is provided in the control box
for positive grounding.
CAUTION: In order for the automatic cooling system to function, power must be
maintained to burner strip terminal L1. Do not install any safety or on-off controls in
the circuit between the fused disconnect switch and strip terminal L1. Optional remote
control devices should be connected in place of, or in addition to, the switch or timer
as indicted in Figure 3 Wiring Diagram.
NOTE: Optional 0-6 hour Timer may be substituted for the burner On-Off Switch.
_________________________________
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 Orifice 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. Confirm 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 first 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 charging door making sure any Door Open interlock is temporari-
ly bypassed.
7. Turn off the Burner Switch or Timer for at least 30 seconds to reset Electronic Control
(see Section XII Electronic Control System. Open the Main Manual Shut Off Valve.
8. Turn on the Burner Switch or Timer. Burner Ignitor and main flame 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 flame. If it is weak, screw in the Ignitor regulator adjustment to
increase the pressure. If it is excessively rich and large or floating from the ignitor tip,
back off the regulator adjustment to reduce the pressure. Set the ignitor to a stable
blue flame which burns firmly within the ignitor tip. Check flame current with a microammeter 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 specified range during adjustment, an over-fire
condition could result when pressure returns to normal, particularly if the regulator adjustment screw is BOTTOMED OUT. ALWAYS confirm 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 through
out range to confirm Ignitor stability. Try several relights. Refer to Table 3.
6
Part 1 Installation
VII Initial Start Up /
Adjustment
VI Electrical
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 deterioration of ignitor ports in Retention Plate.
7
Part 1 Installation
Part 1 Service
VIII Ignitor &
Regulator
Assembly
Figure 4: General Burner Head Assembly
Ignitor trouble will be evi-
denced by failure of main burner ignition. It may cause frequent Electronic Control lockout. Check for dirt in the ignitor
air and mixture passageways
and check for obstructions in
the ignitor ports. Also check
electrode adjustments (see Figure 5). Replace any severely burned parts.
Proper operation of the flame sensor rod can be checked by measuring the flame cur-
rent. With the Electronic Control energized, a good reading should run steady 2 or more
microamps.
When servicing, clean the Ignitor Retention Plate ports and blow out the internal air and
gas passages. Clean the Electrode Insulators and check them for hairline cracks. Also
check the electrode ends and the Ground Barrier for serious corrosion or loss of metal.
Replace any defective parts.
Make sure that there is no debris in the Blast Tube that could short out the Spark or
Flame Electrode.
Clean the Ignitor Gas Orifice in Tee Orifice Fitting (see Figure 5) and check that the ori-
fice size is correct per Table 3.
Check that the electrode ends are positioned and that the gap between the end of each
electrode and the ground barrier is spaced per Figure 5.
Check that the Ignitor Air Deflector is at the correct angle (45°). See Figure 4.
Inspect the electrode wire insulation for cracks or worn areas, or any contact with the
burner frame. Dampness will
facilitate electrical leakage to
ground, which will cause ignition
or flame signal failure.
SPARK TEST—Main Manual
Shut-Off Valve must be off.
Place the Ignitor Assembly on
top of the burner with the electrode ends visible and good
metal to metal contact between
the Ignitor Mounting Plate and
the burner chassis.
Connect the high voltage wire
to the spark electrode. Spark
should be visible during 6-second trial for ignition period and
arc from the electrode end to
the Ground Barrier. It should be
audible and visible, though it is
rather thin and difficult to see in
bright light.
CAUTION: Circuit has
30,000 volt open circuit potential.
If the spark is not audible or
visible it is leaking directly to
ground. Before removing electrodes, check to make sure voltage is available by positioning
the spark wire 1/8" from the end
of the electrode.
Disconnect Flame Electrode wire and switch the high voltage wire to the flame electrode
and repeat test for insulator leakage.
CAUTION: Do not indiscriminately change the ignitor gas orifice size as ignition
troubles are rarely cured in this manner. The ignitor utilizes a premixed gas/air mixture
and, as the air input is relatively fixed, any adjustment to the gas/air ratio that might
be required for a specific application should be made by careful adjustment of the ignitor regulator to vary its outlet gas pressure. Pressure adjustments must be made when
the gas is flowing. If cleaning and electrode adjustment does not eliminate an ignition
problem, further checks are required. Refer to Trouble Chart.
8
Part 1 Service
Table 3: Ignitor Firing Rate
Type of
Gas
NATURAL
PROPANE
6 MBH
7 MBH
Ignitor Orifice
Diameter
.052 (#55Dr.)
.042 (#58Dr.)
Recommended
Ignitor Gas Pressure
Ignitor
Gas Rate
3.5” W.C.
Figure 5: Ignitor and Flame Sensor Assembly
VIII Ignitor &
Regulator
Assembly
Continued
_________________________________
The valve is a single function on-off type with automatic closing on current failure. Replace
entire valve if valve fails to open when power is applied or if leakage is defected on standby.
_________________________________
The motor is a 1550 RPM shaded pole motor with auto-reset overload protection. It contains
a centrifugal Interlock Switch which is connected in the control circuit to prevent burner operation if the motor fails. The motor features permanently lubricated ball bearings and requires
no routine oiling maintenance.
Cleaning of the blower wheel is usually the only service required. Need for cleaning is
required if the inlet screen or blower wheel shows an accumulation of dust and lint. The motor
air cooling vents should also be cleaned at this time.
If the motor must be replaced, disconnect the motor wires from the burner terminal strip.
Remove the blower inlet screen and blower wheel and remove the motor case bolt nuts and
lockwashers.
When remounting the blower wheel, the distance from the wheel and the outside of the
blower housing air inlet side plate should be 5/16".
_________________________________
The Thermal Switch is a heat sensitive single pole double throw snap switch that energizes
the blower motor to provide cooling air if, because of a heat back up through the burner when
the motor is off, the temperature of the blower housing reaches 160° F. The thermal switch
is not wired into the gas valve circuit and does not turn valve off when activated by heat back
up.
The switch mechanism is a bi-metallic disc that snaps over when it is heated to the set tem-
perature. The switch is mounted so that the disc bears against the side plate of the blower
housing.
Testing the switch to prove that it is functional can be done by removing the ignitor assem-
bly and blowing hot air through the opening toward the blower inlet. If hot air is not available,
remove the switch and check for continuity. With the switch cool, there should be continuity
between terminals 1 (black wire) and 3 (red/black wire). To simulate the “hot” condition, place
the switch on a firm surface and apply finger pressure to the switch disc. When the disc
“snaps”, there should be continuity between terminals 1 and 2 (red wire).
_________________________________
The Electronic Control is a 24 volt AC, solid state electronic device that automatically ignites
and monitors the flame. It has an integral high voltage transformer and, upon flame startup,
applies high voltage to the spark electrode and 24V to the Main Automatic Gas Valve. When
the flame is proven, the spark is terminated and the burner run continues.
If the flame is not proven within 6 seconds, or if the proof of flame is lost during the burn-
er 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 malfunc-
tion and cause serious injury or death. Replace any device that has been wet.
9
Part 1 Service
IX Main Automatic
Valve
X Blower Assembly
XI Thermal Switch
XII Electronic
Control System
TROUBLE CHART
Make sure the thermostat and operating controls are calling for heat. Defective wiring or loose
connections can simulate the component defects outlined below. Check associated wiring
before replacing a component.
ELECTRICAL AND FLAME CHECKS MUST BE MADE IN THE ORDER LISTED.
A. Confirm 120V between strip terminals:
1. L1 & L2 no voltage - Fused disconnect off or Fuse open.
2. L2 & 3 no voltage - Optional on/off and/or safety controls open.
3. L2 & 4 no voltage - Burner Switch or Timer open and/or Remote Switch or Timer
open.
4. L2 & Thermal Switch terminal 1 (black wire).
a. None - Thermal Switch is defective.
b. Yes - Motor is defective.
A. Confirm that Main Manual Shut-Off Valve is open.
B. Check for 120V between strip terminals 4 and L2.
1. Yes - turn Burner Switch or Timer off for a minimum, of 30 seconds to RESET
Electronic Control.
2. No voltage, Thermal Switch is defective.
C. Check for 24V* between strip terminals 6 to 10. No voltage, transformer is defective.
D. Check for 24V* between strip terminals 5 and 10. No voltage, motor interlock switch
is defective.
E. Check for 24V* between Electronic Control 24 (PWR) terminal and strip terminal 10. 24V -
yellow wire from strip terminal 10 is defective.
F. Check for 24V* between Electronic Control 24 (GND) terminal and strip terminal 10. No
voltage, red wire from terminal strip 5 is defective.
G. Turn burner control off for a minimum of 30 seconds to RESET Electronic Control for each
of the following steps.
CAUTION: Tests are valid only during the 6 second trial for ignition.
1. Check for 24V* between Electronic Control Valve terminal and strip terminal 10. No
voltage, Electronic Control or Fuse is defective.
2. Check for 24V* between strip terminals 7 and 10. No voltage, blue wire from strip
terminal 7 is defective.
3. Check for ignition spark (spark length approximately 1/8"):
a. Between Electronic Control HI VOLTAGE terminal and earth ground. No
spark, Electronic Control or Fuse is defective.
b. Between electrode wire and Spark Electrode. No Spark, Electrode wire is
defective.
c. Check for spark between Spark Electrode and ground barrier. See Figure 5.
If ignitor tip is not visible with burner mounted, but spark can be heard, continue with Step G4. If spark cannot be heard, refer to Section VIII Ignitor and
Regulator Assembly for spark test.
4. Connect manometer to Ignitor Gas Pressures Test Tap and, during 6 second trial for
ignition period, check gas pressure.
a. No pressure, confirm that pressure of at least 4" W.C. is available at inlet of
automatic gas valve (connect manometer to valve upstream tap) and repeat
Step G4. If still no ignitor gas pressure, valve is defective.
b. Ignitor gas pressure 3" to 4" W.C., continue with Step G5.
c. Adjust the ignitor regulator to 3.5" W.C. while gas is flowing.
5. Open charging door, make sure any Door Open interlock is bypassed, and repeat trial
for ignition.
a. With flame on, close charging door and check combustion chamber pressure,
burner peep hole can be used for access to obtain approximate reading.
Make sure sensing tube extends into the combustion chamber at least 6".
Pressure should be between 0" and minus 0.5" W.C. If pressure is on the
high negative side of the range, increase the ignitor gas pressure to 4" or 5"
W.C.
b. No flame, clean and test ignitor assembly per Section VIII Ignitor and
Regulator Assembly .
10
Trouble Chart
I Motor Will Not Run
II Motor Runs
Continuously, but
No Flame-Housing
Cool
A. With motor running check burner line voltage terminals for 120V as follows:
1. Between strip terminals L1 and L2 - 120V: voltage OK.
2. Between strip terminals L1 and GND.TERM - 120V: ground OK.
3. Between strip terminals L2 and GND.TERM. - no voltage: no backfeed neutral
OK.
B. Follow test procedure as specified in Step II G.
1. Connect DC microamp meter in series with sense wire and Electronic Control
SENSE terminal. With flame on, flame signal should be steady and at least 2
microamps. Check sense wire for continuity Adjust ignitor gas pressure to
obtain acceptable signal and note gas pressure and signal strength for future
reference.
A. Low gas pressure
B. Air shutter open too far
C. Input adjuster not set properly
A. High gas pressure
B. Air shutter closed too far
C. Insufficient free air in combustion chamber
D. Dirty blower wheel
E. Input adjuster not set properly
A. Defective automatic valve
B. High gas pressure
*Normal low voltage:
Motor running - 24V minimum
Automatic valve energized - 21V minimum
Trouble Chart
III Flame on Only
During 6-Second
Trial for Ignition
IV Short Flame
V Long Hazy Flame
VI Gas Fails to Shut
Off
11
Midco International Inc. 4140 West Victoria Street * Chicago, Illinois 60646
tel 773.604.8700 fax 773.604.4070 web www.midco-intl.com email sales@midco-intl.com
602
8470 23
Printed in USA
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