Midco EC200, EC300 User Manual

Installation, Service Instructions and Parts

Economite Legacy Series
EC200 and EC300

Conversion Burners

The ECONOMITE Model EC Series gas burner is adaptable to any type gas utilization equipment, including gravity and forced air
circulation furnaces and boilers, and is particularly recommended for horizontal and downdraft gas utilization equipment since it is
a direct spark type burner. Power burner design makes it perfectly suited for oil burner replacement.

• In the United States, installation must conform with local codes or in
the absence of local codes, with the National Fuel Gas Code, ANSI
Z223.1-latest edition available from American National Standard
Institute. Installation of Domestic Gas Conversion Burners, ANSI
Z21.8a- latest edition and National Fuel Gas Code, ANSI Z223.1­latest edition(s) available from American National Standard Institute.
Further reference should be made to the recommendation of your
fuel supplier.

• 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. 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.

• WARNING: Additions, changes, conversions and service

must be performed by an authorized Midco representative,
service agency or the fuel supplier. Use only MIDCO specifi ed
and approved parts.

• INSTALLER: Inform and demonstrate to the user the correct
operation and maintenance of the gas utilization equipment. Inform
the user of the hazards of storing fl ammable liquids and vapors
in the vicinity of this gas utilization equipment and remove such
hazards. Affi x this manual and associated literature to the 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 and associated
literature is required, contact a qualifi ed service agency. DO NOT
ATTEMPT REPAIRS. An inadvertent service error could result in a
dangerous condition.

AVOID ERROR IN PARTS SELECTION. When ordering use complete MIDCO
Part Number and Description. Furnish Burner Model Number, Bill of Material
Number and Serial Number (if available) from the specifi cation plate found on the
product.

IMPORTANT: Availability of parts as well as specifi cations are subject to change
without notice. Please consult factory for item availability.

WARNING: If the information in these instructions
is not followed exactly, a fi re or explosion may result,
causing property damage, personal injury or death.

Do not store or use gasoline or other fl ammable 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 phone your gas supplier from another
building. Follow the gas supplier’s instructions. If
you cannot reach your gas supplier call the fi re
department.

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

BURNER MODEL: ___________________________________

BILL OF MATERIAL
NUMBER: ___________________________________

SERIAL NUMBER #: ___________________________________

WIRING DIAGRAM: ___________________________________

FOR SERVICE CONTACT

Name: ____________________________________________

Address: ____________________________________________

____________________________________________

Phone: ____________________________________________

Date of Installation: ___________________________________

Midco® International Inc.
4140 West Victoria Street
Chicago, Illinois 60646
toll free 866.705.0514
tel [phone]
fax [phone]
web www.midcointernational.com
e-mail [e-mail]

SAFETY INFORMATION TERMS: The following terms are used to identify hazards, safety precaution of special notations
and have standard meanings throughout this manual. They are printed in all capital letters using a bold type face as shown
below, and preceded by the exclamation mark symbol. When you see the safety alert symbol and one of the safety information
terms as shown below, be aware of the hazard potential.
DANGER: Identifi es the most serious hazards which will result in severe personal injury or death.
WARNING: Signifi es a hazard that could result in personal injury or death.
CAUTION: Identifi es unsafe practices which would result in minor personal injury or product and property
damage.

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Quality Designed for Proven Performance

Printed in USA

513

Part 1 Installation

Specifi cations

NATURAL or PROPANE Gas

Air Delivery EC 200 EC 300

(Approximate air delivery at zero draft) 40.0 SCFM* 60.0 SCFM*

Maximum Firing Rate** 200 MBH*** 300 MBH***

Minimum Firing Rate** 70 MBH*** 90 MBH***

Tube Diameter 4 inches 4 inches

Tube Length 7.50 inches 7.50 inches

Combustion Chamber Size Recommended Minimum W & H

100 MBH *** 8″ W x 8″ H

200 MBH *** 10″ W x 10″ H

300 MBH *** 14″ W x 14″ H

Gas Pressure Required

NATURAL or PROPANE 6.0″ to 14.0″ W.C. 6.0″ to 14.0″ W.C.

Electrical Supply Standard 120/1/60, 2.0 Amps 120/1/60, 3.0 Amps

230 volts 50/60 hz **** 230 volts 50/60 hz ****

Flame Safety 24V Electronic Flame Safety, with 100% shut-off,

30-second pre-purge.

Main Automatic Valve 3 Function Redundant 3 Function Redundant

Notes:
* SCFM=Standard Cubic Feet/Minute
** Ratings based on 1,000 BTU/cu. ft. NATURAL, 2500 BTU/cu. ft. PROPANE at Sea Level.
*** 1 MBH=1,000 BTU/Hr.
**** Available - Contact Factory
Derate burner for altitudes over 2,000 feet by 4% for each 1,000 feet above sea level.

General Information

I - Ventilation

CAUTION: The ECONOMITE EC Series is not intended for outdoor installation and
must be protected from excessive moisture. Provide adequate clearance for service and
proper operation.

Before installation, read these instructions carefully.

The EC 200 / 300 burner is a gas power burner designed for fi ring natural or propane gas in most
applications. The burner is a self-contained unit consisting of a blower assembly, burner head,
ignition control and a combination gas valve. The burner installation involves mounting the burner to
the gas utilization equipment, piping the gas train and connecting the power supply. Every burner is
operationally fi re tested at the factory prior to shipping.
___________________________

If the former automatic oil burner provided trouble-free operation, then the gas utilization equipment
area should have suffi cient air for combustion and the dilution of fl ue gases.

Nevertheless, the area must be checked:

- Open basement or utility areas of normal construction, without storm windows or tight doors,
will generally allow suffi cient air infi ltration. However, if the gas utilization equipment is located in a
tight or separate room, additional ventilation may be required. Install two permanently open grills,
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 located in the confi ned space. One
grille should be located within 12″ inches of the ceiling, the other within 12″ of the fl oor.

- 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 fi replace is installed in the building,
provisions must be made for an outside air supply near the gas utilization equipment area. Install
permanently open grills sized at not less than one square inch free area per 4,000 BTU of burner
input. When ventilating through horizontal ducts, grills should be sized not less than one square inch

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Part 1 Installation

free area per 2,000 BTU. 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 appliance, heat exchanger interior, combustion chamber, and fl ue 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 fi ring door should open easily to relieve pressure. If positive latches exist, they
should be modifi ed 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.
___________________________

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.

- Install mounting fl ange to the burner blast tube. The distance from the fl ange to the blast
tube edge should be same as the gas utilization equipment wall thickness plus the fl ange gasket
thickness. This will allow the burner blast tube to be fl ush with the inner chamber wall after the
burner is installed. If the blast tube extends into the combustion chamber serious damage to the
burner may occur, voiding the warranty, see Figure 1 & 2 for reference. For minimum combustion
chamber dimensions see Table 1.

I - Ventilation
Continued

II - Preparation of the Gas
Utilization Equipment

III - Combustion Chamber

Gas Input Width/
MBH* Height ″ Length ″
100 8″ 8″
150 9″ 9″
200 10″ 10″
250 10″ 10″
300 10″ 11″

Table 1: Minimum Combustion

Chamber Dimensions

* 1 MBH = 1,000 BTU/Hr

- Mount the burner to the appliance. Use the
supplied gasket to assure a tight seal between the
mounting fl ange and front plate gasket.

- With a wet base boiler, where the entire
combustion chamber is comprised of heat exchange
surfaces and no combustion chamber liner was
provided for oil fi ring, a liner is usually not required.
A liner or target wall may be necessary if the
combustion chamber is unusually short.
To avoid fl ame contact on the heat exchanger walls
or fl ueways.

- Use 2300°F minimum insulating material
when the application requires the construction or
replacement of a combustion chamber liner

- The burner tube must be sealed air tight into the
combustion chamber liner opening with refractory
material as shown by Figures 1 and 2.

CAUTION: In no case should the burner tube be allowed to extend into the

combustion chamber; it must be set fl ush with the inside surface.

Figure 1: Dry Base Boiler with Combustion

Chamber Liner

(Similar to Warm Air Furnace Construction)

Figure 2: Wet Base Boiler with Combustion

Chamber Unlined

Source: ANSI Z21.8b 1993, Installation of Domestic

Gas Conversion Burners. For other applications,

consult factory.

WARNING: Burner cabinet must be mounted in orientation shown in Figures 1 and

2. Any other mounting 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.

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Part 1 Installation

III - Combustion Chamber

Continued

IV - Chimney, Vent

Connector, and Draft

Control

- Before permanently setting the burner in place, check that the burner nozzle is free of foreign
materials and that the electrodes have not been damaged or displaced, see Figure 8.

___________________________

WARNING: The chimney should be inspected for unsafe conditions such as
deteriorated masonry and excessive soot or other blockage. Installation must conform with
local codes. In the absence of local codes, the recommendation installation compliance is
with ANSI Z21.8b latest edition and NFPA, ANSI Z223.1 latest edition.

WARNING: The Vent Connector shall not be connected to a chimney that is
venting solid fuel
burning from any
equipment, any
incinerator or any
open fi replace.

- The Vent
Connector shall
be made of non­combustible,
corrosion resistant
material capable of
withstanding the vent
gas temperature
produced by the
appliance and of
suffi cient 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 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 fl ow 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 fi rmly attached to draft hood
outlets and fl ue collars. Joints
between sections of connector
piping shall be fastened by sheet-

Figures 3 and 4: Copyright by the American Gas Association. Used by

Figure 3: Draft Hoods

CORRECT LOCATIONS

INCORRECT LOCATIONS

Figure 4: Location for Barometric Draft Regulator

permission of the copyright holder.

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Part 1 Installation

metal screws or other approved fi ttings. 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 barometric draft regulator shall be installed in the same room 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 fl ue passage in the equipment.

________________________

CAUTION: Do not add any power consuming devices in the low voltage circuit to
prevent overloading of the transformer.

IV - Chimney, Vent
Connector, and Draft
Control
Continued

V - Electrical

5236-34 5236-40

EC 200/300 115V Wiring Diagram

LEGEND
Solid: Wiring and components by factory
Dashed: Wiring and components by installer
Component
Wire nut

EC 200/300 240V Wiring Diagram

Note: If any of the original wire as
supplied with the burner must be
replaced, it must be replaced
with a type T FF or its equivalent

Figure 5: Wiring Diagram

Note: If any of the original wiring as supplied with the conversion burner must be replaced, it must
be replaced with type TFF wire or equivalent. 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.

- Electrical installation must be made in accordance with the United States National Electric
Code, ANSI/NFPA No.70-latest edition or Canadian Electrical Code, Part 1, CSA Standard C22.1
and applicable local code. If the burner is a part of a gas utilization equipment system, check the
wiring diagram as supplied by the manufacturer.

- Refer to the wiring diagram Figure 5 or the same wiring diagram supplied on the inside of the
burner wiring enclosure. There are three leads (black - L1, white - L2 and green - ground) and two
thermostat wire leads (blue) inside the wiring enclosure.

- Use 14 gauge copper wire for line voltage wiring. Be sure to connect to a permanent live circuit.
Provide a fused on-off disconnect switch carrying a minimum 3 amp fuse.

- The frame of the burner must be well grounded. A terminal is provided in the control box for
grounding.

- Confi rm that the polarity is correct; L1 to black wire, neutral to white. The neutral line should
not be subjected to induced low voltage (check white and green wire to earth ground) from other
equipment as that can cause the electronic fl ame safeguard to malfunction.

- Each installation must include suitable limit controls. The existing oil burner combination limit
and operating controls are NOT SUITABLE for gas burner safety and operation.

- Set the thermostat heat anticipator to the current draw of the gas burner. The current draw of
the gas burner 24V operating circuit is 0.7 amps.

CAUTION: Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation. Verify proper operation after servicing.

___________________________

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