Midco E20BP User Manual

INSTALLATION AND
SERVICE INSTRUCTIONS

ANSI Z21.17

CONVERSION

ECONOMITE
MODELS E20B & E20BP

Gas Conversion Burner

The ECONOMITE Models E20B and E20BP conversion burners are adaptable to most common central heating plants
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 DS24A 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 Z21.8 latest edition and 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 burner 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. When the conversion burner is used

on a Forced Air Central Furnace, the two yellow and black
warning labels in the literature envelope shall be attached in
accordance with Installation Code, CGA Standard CAN/CGA
1-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 the burner. Inform the
user of 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.

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.

BURNERS

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.

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 neighborÕs phone. Follow
the gas supplierÕs instructions.

● If you cannot reach your gas

supplier, call the fire department.

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

MIDCO International Inc.

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

PRINTED IN U.S.A.

8470-78

297

SPECIFICATIONS

Model E20B -- NATURAL Gas Only
Model E20BP -- PROPANE Gas*

AIR DELIVERY (Approximate Air

Delivery at Zero Draft)................................. 47 SCFM**

MAXIMUM FIRING RATE***.............................225 MBH****

MINIMUM FIRING RATE***................................50 MBH****

TUBE DIAMETER....................................................4 inches

TUBE LENGTH........................................................8 inches

MINIMUM COMBUSTION CHAMBER SIZE

225 MBH.......................................7" W x 11" L or 10" dia.

150 MBH.........................................6" W x 10" L or 9" dia.

GAS PRESSURE REQUIRED:

NATURAL and PROPANE....................5.0" to 14.0" W.C.

STANDARD VOLTAGE....................120 volts..........60 cycle

PILOT SAFETY......................Thermoelectric, 100% shut-off

* Model E20BP is equipped with a Redundant Main
Automatic Valve.
** SCFM = Standard Cubic Feet/Minute
*** Ratings based on 1000 BTU/cu. ft. NATURAL, 2500

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 of addition elevation

PART 1 INSTALLATION

CAUTION: The ECONOMITE E20B(P) is not in­tended for outdoor installation and must be protect­ed from excessive moisture. Provide adequate

clearance for service and proper operation.

I VENTILATION

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 confined 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 total input. When ventilating through
horizontal ducts, grilles should be sized at not less than one
square inch free area per 2,000 BTU of the total input rating of
all gas utilization equipment. In the confined space in any case,
the minimum dimension of
less than 3 inches.

■ In Canada, for detailed ventilation requirements, refer to

standard CAN/CGA 1-B149.1 or .2 and/or local codes.

rectangular air ducts shall not be

II PREPARATION OF THE

HEATING APPLIANCE

■ Clean the heating appliance, heat exchanger interior,

combustion chamber and flue connections. Remove all
adhering tars, scale, dirt and soot. Inspect for actual or potential
leaks.

■ Cement all joints, including those in the heating appliance

base and around the 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.

III COMBUSTION CHAMBER

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 an existing oil burner combustion
chamber liner can be used, if in good condition.

■ In the case of wet base boilers, where the entire firing

chamber is comprised of heat exchange surfaces and no
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 firing chamber is unusually short, in
order to avoid excess flame contact on the heat exchanger
walls or flueways.

■ If a built up chamber liner is required, use 2,300

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 and 2. 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.

FIGURE 1 Dry Base Boiler with Combustion Chamber

Liner (Furnace Construction is Similar)

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o

F minimum

FIGURE 2 Wet Base Boiler with Unlined

Combustion Chamber

CAUTION: In no case should the burner tube be
allowed to extend into the chamber proper; it must be set at
least 1" short of the inside surface.

■ Special heat resistant alloy extension tubes and instructions

are available for those applications 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. NON-STANDARD ARRANGEMENTS MAY BE
AVAILABLE FOR SOME MODELS - CONSULT FACTORY
FOR DETAILS IF REQUIRED.

■ Before permanently setting the burner in place, check that the

nozzle ribbon and pilot assembly are free of foreign materials,
and also that the spark electrode assembly has not been
damaged or displaced. See Figure 6.

■ The length of horizontal uninsulated Vent Connector

between chimney and a single gas utilization equipment shall
not exceed 75% of the height of the chimney above the
connector, or 100% if the Vent Connector is insulated.

■ 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 or
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 sheet-metal 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.

■ 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.

■ Gas utilization equipment requiring controlled draft may be

equipped with a listed double acting barometric draft regulator,
installed and adjusted in accordance with the manufacturerÕs
instructions, if approved by Local Codes.

■ A device which will automatically shut off gas to the burner

in the event of sustained backdraft is required. It shall be of the
listed manual reset type and installed and adjusted by a
qualified service technician in accordance with the
manufacturerÕs instructions.

IV CHIMNEY, VENT CONNECTOR AND

DRAFT CONTROL

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.

Maximum Firing Rate

100 MBH

143 MBH

195 MBH

225 MBH

TABLE 1 Recommended Vent Pipe Sizes

WARNING: THE VENT CONNECTOR SHALL NOT BE

CONNECTED TO A CHIMNEY ALREADY VENTING SOLID
FUEL BURNING EQUIPMENT, AN INCINERATOR OR AN
OPEN FIREPLACE.

■ The Vent Connector shall be made of non-combustible,

corrosion 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.

Vent Pipe Diameter

5"

6"

7"

8"

FIGURE 3 Draft Hoods

FIGURE 4: Barometric Dampers

Figure 3 and 4: Copyright by the American Gas

Association. Used by permission of the copyright holder.

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