Midco RS40 User Manual

direct spark ignition conversion burner is adaptable to any type gas utilization equipment,

including gravity and forced circulation furnaces and boilers, and is particularly recommended for horizontal and downdraft

Do not store or use gasoline or other

flammable vapors and liquids in the

vicinity of this or any other

Installation and service must be

performed by a qualified installer,

phone. Follow the gas suppliers'

supplier, call the fire department.

USER: Retain this manual for future reference. If other than routine service or maintenance

ATTEMPT REPAIRS. An inadvertent service error could result in a dangerous condition.

: 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

Identifies unsafe practices which would result in minor personal injury or product and property damage.

Installation and Service Instructions

602

8471 09

Printed in U.S.A.

Economite RS40

Conversion Burners

The ECONOMITE Model RS40
gas utilization equipment since it needs no draft to maintain a pilot. 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 Installation of
Domestic Gas Conversion Burners , ANSI Z21.8a-latest
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 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 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: If the information in
these instructions is not followed
exactly, a fire or explosion may
result, causing property damage,
personal injury or death.

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 neighbor's

INSTALLER: Inform and demonstrate to the user

the correct operation and maintenance of this gas
utilization equipment. 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.

instructions.

• If you cannot reach your gas

service agency or the gas supplier.

as described in this manual is required, contact a qualified service agency. DO NOT

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:

Midco®International Inc
4140 West Victoria Street Chicago, Illinois 60646
tel [phone] fax [phone] web www.midco-intl.com

Part 1 Installation

Specifications

NATURAL or PROPANE Gas

Air Delivery

(Approximate air delivery at zero draft)
Maximum Firing Rate**
Minimum Firing Rate**
Tube Diameter
Tube Length
Minimum Combustion Chamber Size

200 MBH

150 MBH
Gas Pressure Required

NATURAL or PROPANE
Electrical Supply
Flame Safety

Main Automatic Valve

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.
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.

24V Electronic Flame Safety, Direct Spark Ignition

with 100% shut-off, 30-second prepurge.

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

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

3 Function Redundant

42 SCFM*

200 MBH***

75 MBH***

4 inches

6.5 inches

5.0" to 14.0" W.C.
120/1/60, 3 Amp

Part 1 Installation

I Ventilation

CAUTION: The ECONOMITE RS40 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 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 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 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 at not
less than one square inch free area per 2,000 BTU of all gas utilization equipment in the
confined space. 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.

_____________________________________

II Preparation of the Gas

Utilization Equipment

2

?? 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.

_____________________________________

3

Part 1

Part 1 Installation

Installation Continued

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 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

Figure 1: Dry Base Boiler with

Combustion Chamber Liner (Warm Air

Furnace Construction is Similar)

Figure 2: Wet Base Boiler with

Combustion Chamber Unlined

?? Before permanently setting the burner in place, check that the burner nozzle is free of
foreign materials and also that the electrodes have not been damaged or displaced, see
Figure 7.

_____________________________________

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, 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 chamber
proper; it must be set flush with the inside
surface.

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.

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 Z21.8b 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 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.
?? 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 con -

Maximum

Input

100 MBH
130 MBH
195 MBH
200 MBH

Table 1: Recommended Vent

Connector Sizes

Source: ANSI Z21.8b 1993, Installation

of Domestic Gas Conversion Burners.

For other applications,

consult appropriate standards.

Vent Connector

Dia.

5"
6"
7"
8"

nector, 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

Part 1 Installation

Part 1

Installation Continued

IV Chimney, Vent Connector,

and Draft Control Continued

Figure 3: Draft Hoods Figure 4: Location for Barometric

Draft Regulator

Figures 3 and 4: Copyright by the American Gas Association. Used by permission of the copyright holder.

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 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.

_____________________________________

V Electrical

4

CAUTION: Do not add any power consuming devices in the low voltage circuit
as overloading of the transformer can result. Do not use Motor Relay to operate any
external devices as overloading of motor relay contacts can result.

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 its 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.

Figure 5: Wiring Diagram

?? Use 14 gauge copper wire for line voltage wiring. Be sure to hook up to a permanently
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 positive grounding where insulated pipe couplings are used or where any doubt
exists regarding grounding sufficiency.
?? Confirm that the polarity is correct—hot wire to black wire, neutral to white, and that
the neutral line is not subject to induced low voltage (check white wire to earth ground)
from other equipment as that can cause the electronic flame safeguard to malfunction.
?? Each installation must include suitable limit controls. Existing oil burner combination
limit and operating controls are normally NOT SUITABLE for gas burner use.