Midco J121A-3 User Manual

INSTALLATION AND

International Inc.

4140 WEST VICTORIA STREET • CHICAGO, ILLINOIS 60646 • [phone] FAX: [phone] • http://www.midco-intl.com

SERVICE INSTRUCTIONS

INCINOMITE MODELS

J81A-3 and J121A-3

Incinerator Gas Burners

The INCINOMITE Models J81A-3 and J121A-3 incinerator gas burners feature continuously monitored electronic flame safety and
spark ignited intermittent proven ignitor (pilot). They are adaptable to either primary or secondary chamber installation.

In the United States, installation must conform with local codes

or, in the absence of local codes, with National Fuel Gas Code

ANSI Z223.1-1992, or latest edition available fromAmerican
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.

Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.

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-B-149.1 or 2. Further reference should be made

to the recommendation of your fuel supplier.

• Do not try to light any appliance.

• Do not touch any electrical switch;

INSTALLER: Inform and demonstrate to

the user the correct operation and
maintenance of this gas utilization

• Immediately call your gas supplier

equipment. Inform the user of the
hazards of storing flammable liquids and
vapors in the vicinity of this gas

• If you cannot reach your gas supplier,

utilization equipment and remove such
hazards. Affix this manual adjacent to
the incinerator burner. CODE
COMPLIANCE IS THE SOLE
RESPONSIBILITY OF THE INSTALLER.

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 must be
performed by a qualified installer, service
agency or the gas supplier.

WARNING: If the information in
these instructions is not followed
exactly, a fire or explosion may result
causing pro p e rty damage, personal
injury or death.

WHAT TO DO IF YOU SMELL GAS

do not use any phone in your
building.

from a neighbor's phone. Follow the
gas supplier's instructions.

call the fire department.

MIDCO

PRINTED IN U.S.A.

797

8470-70

SPECIFICATIONS

1

BURNER AIR DELIVERY(Approximate Air Delivery at Zero Draft)

J81A-3………………………………………....90 SCFM

2

J121A-3………………………………………..180 SCFM

MINIMUM GAS PRESSURE LISTED FOR PURPOSE OF
INPUT ADJUSTMENT

( Take Pressure at Inlet Tap of Main Automatic Va l v e )

N ATURAL………………………………………………..5.5" W . C .
P R O PANE……………………………………………….8.0" W . C .

BURNER FIRING RATE (NAT U R A LOR PROP A N E )

All Ratings Based on 1000 BTU/cu. ft. NATURAL, 2500 BTU/cu. ft. PROPANE at Sea Level

3

M I N I M U M

J81A-3 or J121A-3………………………………… 100 MBH

MAXIMUM (With Combustion Air From Burner Only)

J81A-3

20% Excess Air……………………………450 MBH
0% Excess Air (stoichiometric)…………..540 MBH

J121A-3

20% Excess Air……………………………900 MBH
0% Excess Air……………………………1080 MBH

MAXIMUM (With Combustion Air From Burner Blower and

Additional Air Available in Combustion Chamber.)

NATURALGas 5.5" W.C. or PROPANE Gas
at 11.0" W.C. Gas Pressure at Main Automatic Valve

J81A-3…………………………………………800 MBH
J121A-3……………………………………..1,200 MBH

ELECTRICAL SUPPLY

J81A-3………………………………...120/1/60; 3 a m p s

J121A-3………………………………..120/1/60; 4.5 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 ULrecognized, 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. 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 over-fire.
Derate burner for altitudes over 2,000 feet by 4% for each 1000
feet above sea level.

4. 100 MBH = 100,000 BTU/Hr.

5. Kit is available for field installation.

PART 1 INSTALLATION

I PRIMARY CHAMBER FUEL INPUT

■ No. 1 Waste: Primarily dry material such as paper, rags

4

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.

II INDOOR VENTILATION

Make sure that the incinerator room has suff i c i e n t
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.

III INSTALLATION

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.

FIGURE 1 Typical Installation

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■ If the incinerator is designed only for No. 4 waste, the

level can be lowered to bring the flame to play 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 T ube
(41⁄4" 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.

■ 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.

IV CHIMNEY, VENT CONNECTOR AND

DRAFT CONTROL

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. for Model J81A-3, 0 to minus 1.0” W.C. for Model
J121A-3), 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 Z223.1-1992
"National Fuel Gas Code", or latest edition available from
American National Standards Institute to prevent
tampering.

■ A suitable Main Gas Pressure Regulator should be

installed as shown in Figures 1 or 3. 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. The regulator must have a
minimum flow regulating capacity for the ignitor gas
rate (see Table 4). It is strongly recommended that a
separate smaller regulator be used for ignitor gas,
connecting to the gas line ahead of the Main Gas
Pressure Regulator and downstream of any
intermediate Regulator.

■ For full input, refer to SPECIFICATIONS, page 2, for

minimum gas pressure required. For reduced capacities,
refer to Firing Rate Curves, Table 2 or 3.

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. A LWAYS confirm that at least the
minimum rated pressure is being supplied during
regulator adjustments, and NEVER B O T TOM 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
(NATURALgas 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.

NPT
PIPE
SIZE

3⁄4"

1"
1-1⁄4"
1-1⁄2"

2

TYPE

OF GAS

NATURAL

PROPANE

NATURAL

PROPANE

NATURAL

PROPANE

NATURAL

PROPANE

NATURAL

PROPANE

APPROXIMATE CAPACITY-MBH

LENGTH OF PIPE/FEET

10

20

40

60

100

275

200

130

450
520

820

1050
1200

1200

300
350

550
730

1150
1100

1200
1200

200
245

385
500

790
760

1200
1200

100
165

195
300

400
630

610
960

1150
1200

125
150

235
300

480
460

725
870

1200

V PIPING

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 off 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 resistant 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 3.

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 Schedule 40 Pipe Capacities in MBH

■ 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.

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