Midco 400B-02 User Manual
The ECONOMITE Models 400B-02 and 400B-02P conversion burners are adaptable to most common central gas utilization
equipment, including up-draft gravity and forced circulation furnaces and boilers. Power burner design makes it perfectly suited
for oil burner replacement. For horizontal and downdraft gas utilization equipment, ECONOMITE Model DS45B conversion burner with direct spark ignition is recommended.
In the United States, installation must conform with local
codes or, in the absence of local codes, with Installation
of Domestic Gas Conversion Burners, ANSI Z21.8alatest edition and National Fuel Gas Code, ANSI
Z223.1-latest edition(s) 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 dis
tributor (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. When the conver-
sion burner is used on Forced Air Central Furnace, the
two yellow and black warning labels in the literature enve
lope shall be at tached in accordance with Installation
Code, CGA Standard CAN /CGA1-B149,Clause 5.4.4.4.
Further reference should be made to the recommendation
of your fuel supplier.
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 conversion burner.
CODE COMPLIANCE IS THE SOLE RESPONSIBILITY
OF THE INSTALLER.
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 nota-
tions 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.
ANSI Z21.17$CSA2.7
CONVERSION BURNERS
Installation and Service Instructions
Midco International Inc.
4140 West Victoria Street Chicago, Illinois 60646
tel 773.604.8700 fax 773.604.4070 web www.midco-intl.com
201
8470-75
Printed in U.S.A.
Economite 400B-02
Conversion Burners
Notes:
* Model 400B-02P is equipped with a 4-Function Redundant Main Automatic Valve.
** SCFM=Standard Cubic Feet/Minute
*** Ratings based on 1,000 BTU/cu. ft. NATURAL, 2,500 BTU/cu. ft. PROPANE at Sea
Level.
**** 1 MBH=1,000 BTU/Hr.
One gallon of fuel oil=140,000 BTU.
Derate burner for altitudes over 2,000 feet by 4% for each 1,000 feet above sea level.
CAUTION: The ECONOMITE 400B-02(P) is not intended for outdoor installation and must be protected from excessive moisture. Provide adequate clearance for service and proper operation.
If the former automatic oil burner gave trouble-free operation, it is probable that the gas utilization equipment area has sufficient infiltration of air for combustion and dilution of flue gases.
Nevertheless, the area must be checked:
Open basement or utility areas of normal construction, without storm windows or tight doors,
will generally allow sufficient air infiltration. However, if the gas utilization equipment is located
in a tight or separate room, ventilation to an open area as described above will be required.
Install two permanently open grilles, each sized on the basis of one square inch free area per
1,000 BTU (but not less than 100 square inches) of the total input rating of all gas utilization
equipment in the combined space. One grille should be located within 12 inches of the ceiling,
the other within 12 inches of the floor.
If the gas utilization equipment is located in an area of unusually tight construction, or if an
exhaust fan, kitchen ventilation system, clothes dryer and/or fireplace is installed in the building, provision must be made for an outside air supply near the gas utilization equipment area.
Install permanently open grilles sized at not less than one square inch free area per 4,000 BTU
of burner input. When ventilating through horizontal ducts, grilles should be sized at not less
than one square inch free area per 2,000 BTU of burner input. In any case, the minimum
dimension of rectangular air ducts shall not be less than 3 inches.
In Canada, for detailed ventilation requirements, refer to standard CAN/CGA 1-B149.1 or .2
and/or local codes.
Clean the gas utilization equipment, heat exchanger interior, combustion chamber, and flue
connections. Remove all adhering tars, scale, dirt and soot. Inspect for actual leaks and/or
potential leaks.
Cement all joints, including those in the gas utilization equipment base and around door
frames, to prevent leakage into or out of the combustion chamber.
The access or firing door should open easily to relieve pressure. If positive latches exist,
they should be modified to permit easy opening; a spring loaded door holder is recommended.
On all boilers, make certain the pressure relief safety valve is in good operating condition.
Specifications
2
Model 400B-02 NATURALGas only
Model 400B-02P PROPANE Gas*
Air Delivery
(Approximate air delivery at zero draft)
Maximum Firing Rate***
Minimum Firing Rate***
Tube Diameter
Tube Length
Minimum Combustion Chamber Size
400 MBH
300 MBH
200 MBH
Gas Pressure Required
NATURAL
PROPANE
Standard Voltage
Pilot Safety
85 SCFM**
400 MBH****
200 MBH****
4 inches
9 inches
10" W x 16
1
/2L or 15" dia.
9" W x 14" L or 13" dia.
7" W x 11" Lor 10" dia.
5.0" to 14.0" W.C.
11.0" to 14.0" W.C.
120 Volts 60 Cycle
Thermoelectric, 100% shut-off
I Ventilation
II Preparation of the Gas
Utilization Equipment
Part 1 Installation
A combustion chamber liner is normally required to protect non-heat transfer surfaces and to
provide a radiant bed for rapid heat transfer to the primary surfaces of the heat exchanger. In
most cases, the oil burner combustion chamber
liner formerly used can be used, if in good condition.
In the case of wet base boilers, where the
entire combustion chamber is comprised of heat
exchange surfaces and no combustion chamber
liner was provided for oil firing, a liner is usually
not required for the ECONOMITE. However, a
liner or target wall may be necessary if the combustion chamber is unusually short, in order to
avoid flame contact on the heat exchanger walls
or flueways.
If a built up chamber liner is required, use
2300°F minimum insulating material.
The burner tube, or the stainless steel sleeve
that is included with the burner, must be sealed
air tight into the combustion chamber liner opening with refractory material as shown by Figures
1,2 and 7. The sleeve is preferred as it is
designed to properly locate the end of the tube relative to the inside wall of the combustion
chamber, and to permit burner removal without breaking the seal.
CAUTION: In no case should the burner tube be allowed to extend into the cham-
ber proper; it must be set at least 1" short of the inside surface , because high combustion chamber temperatures will cause premature thermocouple and pilot deterioration.
Special heat resistant alloy extension tubes and instructions are available for those applica-
tions where the burner tube is too short to reach the combustion chamber (such as old-fashioned gravity warm air furnace installations).
WARNING: Burner cabinet must be
mounted in orientation shown in figures 1
and 2. Any other mountings may cause a
dangerous condition, and will void burner
warranty and agency approvals. Nonstandard arrangements may be available
for some models; consult factory for
details if required.
Before permanently setting the burner in place,
check venturi casting openings and pilot assembly to make sure they are free of foreign materials. See Figure 8.
WARNING: The chimney shall be
inspected for unsafe conditions such as
deteriorated masonry and excessive soot
or other blockage or potential blockage.. Installation must conform with local
codes or in the absence of local codes with ANSI Z21.8 latest edition and NFPA,
ANSI Z223.1 latest edition.
WARNING: The Vent Connector shall not be connected to a chimney already venting solid fuel burning
appliances, an incinerator or an open fireplace.
The Vent Connector shall be made of non-combustible, corro-
sion resistant material capable of withstanding the vent gas temperature produced by the gas utilization equipment and of sufficient thickness to withstand physical damage.
The Vent Connector shall be as short as possible. The
entire length shall be readily accessible for inspection, cleaning and replacement.
The length of horizontal uninsulated Vent Connector between chimney and a single gas uti-
liza
tion equipment shall not exceed 75% of the height of the chimney above the connector, or
100% if the Vent Connector is insulated.
3
III Combustion Chamber
IV Chimney, Vent
Connector*,
and Draft Control
*Formerly referred to as Flue Pipe
Figure 1: Dry Base Boiler with Combustion
Chamber Liner (Warm Air Furnace
Construction is Similar)
Figure 2: Wet Base Boiler with
Combustion Chamber Unlined
Maximum
Firing Rate
Vent
Connector
250 MBH
320 MBH
400 MBH
7"
8"
9"
Table 1: Recommended
Vent Connector Sizes
The Vent Connector shall be installed so as to avoid turns or other construction features
which create excessive resistance to flow of vent gas. It shall be installed without any dips sags
and shall slope upward at least 1/4" per
foot.
A manually operated damper shall
not be placed in the Vent Connector or
chimney of any gas utilization equipment.
The Vent Connector shall be firmly
attached to draft hood outlets and flue
collars. Joints between sections of connector piping shall be fastened by sheetmetal screws or other approved means.
The Vent Connector shall be supported
for the design and weight of the material
employed to maintain clearance and prevent physical damage and separation of
joints.
Gas utilization equipment requiring
controlled draft may be equipped with a
listed double acting barometric draft regulator, if approved by local codes. It
must be installed and adjusted in accordance with the manufacturer's instructions.
A draft hood or a barometric draft
regulator shall be installed in the same
room or enclosure as the equipment in
such a manner as to prevent any difference in the pressure between the hood
or regulator and the combustion air supply. In no case shall the relief opening of
the draft hood or barometric draft regulator be located at a point lower than the
top of the highest flue passage in the
equipment.
A device which will automatically
shut off gas to the burner in the event of
sustained backdraft is recommended if
such backdraft might adversely affect
burner operation or if flue gas spillage
might introduce a hazard. If such a
device is used, it shall be of the listed
type and installed and adjusted by a qualified service technician in accordance
with the manufacturer's instructions.
Installation wiring and grounding of the burner must conform to local codes, or in their absence
in the United States to National Electric code, ANSI/NFPA No. 70-latest edition; in Canada,
to Canadian Electrical Code Part 1, CSA Standard C22.1.
Use copper wire not less than 14 gauge for line voltage wiring. Hook up to a dedicated line
with an on-off disconnect switch and a minimum 10 amp breaker.
The frame of the burner should be well grounded. Normally the piping and/or electric con-
duit will provide sufficient grounding. However, a terminal is provided on the terminal strip for
positive grounding where insulated pipe couplings are used or where any doubt exists regarding grounding sufficiency.
Confirm that the polarity is correct—hot wire strip terminal 1, neutral 2— and that the neu-
tral line is not subject to induced low voltage (check 2 to earth ground) from other equipment.
Each installation must include suitable limit controls. Existing oil burner combination limit
and operating controls are normally NOT SUITABLE for gas burner use.
Set the thermostat heat anticipator for the total current draw handled by the thermostat.
The current draw of the ECONOMITE 24V operating circuit is 0.3 amps on 400B-02 (NATURAL) and 0.7 amps on 400B-02P (PROPANE).
4
IV Vent Connector
Continued
V Electrical
Figure 3: Draft Hoods
Figure 4: Barometric Dampers
Figures 3 and 4: Copyright by the
American Gas Association. Used by
permission of the copyright holder.
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