Midco F400-33 User Manual

INSTALLATION AND
SERVICE INSTRUCTIONS

ECONOMITE MODELS

400-33 AND F400-33

Gas Conversion Burners

In the United States, Installation must conform with local codes

or, in the absence of local codes, with Installation of the
National Fuel Gas Code, ANSI Z223.1-1992, or latest edition
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 1B-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 suppler.

WARNING: Additions, changes, conversions, and service
must be performed by an authorized MIDCO representative,
service agency, or the fuel supplier. Use only MIDCO
specified 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 flammable liquids and
vapors in the vicinity of this gas utilization
equipment and remove such hazards. Affix
this manual and associated literature
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 and
associated literature is required, contact
a qualified service agency. DO NOT ATTEMPT

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

SA FE TY INFORMATION TE RM S. The following terms are used to identify hazards, safety precautions or special notations

and have standard meanings throughout this manual. They are printed in all capital letters using a bold typeface as shown below,
and preceded by the exclamation mark symbol:

DANGER: Identifies the most serious hazards which will result in severe personal injury or death.
WARNING: Signifies hazards that could result in personal injury or death.
CAUTION: Identifies unsafe practices which would result in minor personal injury or product and property damage.

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 the building.

Immediately phone your gas supplier from

¥

another building. 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.

BURNER
MODEL

BILL OF MATÕL
NUMBER

DATE
CODE
WIRING

DIAGRAM

FOR SERVICE CONTACT:

name

address

phone

MIDCO International Inc.

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

PRINTED IN U.S.A.

8449-84

797

SPECIFICATIONS

1

The ECONOMITE Models 400-33 and F400-33 con­version burners with intermittent spark ignited pilot are
adaptable to most gas utilization equipment, including
gravity and forced circulation furnaces and boilers. They
are particularly recommended for firing horizontal or
downdraft equipment since they need no draft to main­tain a pilot. Power burner design makes them perfectly
suited for oil burner replacement, including rooftop

applications

and indus

trial

system, clothes dryer and/or fireplace is installed in the
building, provisions must be made for an outside air supply
near the heating appliance 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 1-B149.1 or .2 and/or local codes.

AIR DELIVERY (Approximate Air Delivery at Zero Draft)

400-33........................................................85 SCFM

F400-33....................................................146 SCFM

FIRING RATE (NATURAL or PROPANE)

3

MAXIMUM 400-33......................................400 MBH

MAXIMUM F400-33...................................700 MBH

MINIMUM 400-33.......................................185 MBH

MINIMUM F400-33............................ÉÉ.300 MBH

GAS PRESSURE REQUIRED

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

PROPANE....................................11.0" to 14.0" W.C.

TUBE DIAMETER..........................................................4"

TUBE LENGTH..............................................................8"

RECOMMENDED COMBUSTION CHAMBER SIZE

400-33 AT MAX BTU/HR........................10" x 16

F400-33 AT MAX BTU/HR.ЙЙЙЙЙЙ15" x 25"

2

II PREPARATION OF THE GAS

2

UTILIZATION EQUIPMENT

■ Clean the gas utilization equipment combustion cham-

4

ber, heat exchanger interior, and flue connections. Re-

4

move all adhering tars, scale, dirt and soot. Inspect for ac-

4

tual or potential leaks.

4

■ Cement all joints, including those in the heating appli-

ance 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.

1

■ On all boilers, make certain the pressure relief safety

/2"

valve is in good operating condition.

STANDARD VOLTAGE.............120 Volts...........60 Cycle

FLAME SAFETY..........

Electronic Flame Safety with Spark

Ignited Pilot and 100% Shut-Off.

TABLE1 Burner Specifications

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.

All Ratings Based on 1000 BTU/Cu. Ft. NATURAL, 2500

3.

BTU./Cu.Ft. PROPANE at Sea Level. Derate burner for altitudes
over 2,000 feet by 4% for each 1,000 feet above sea level.

4. 1 MBH = 1,000 BTU/hr.

One gallon of fuel oil = 140,000 BTU.

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 the existing 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

PART 1 INSTALLATION

CAUTION: ECONOMITE Burners are 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 heating plant 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 heating plant 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.

exchanger walls or flueways.

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

mum insulating material.

■ The burner tube, or the stainless steel sleeve that is in-

cluded with the burner, must be sealed air tight into the
combustion chamber opening with refractory material as
shown by Figures 1and 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.

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 instruc-

tions 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.

■ If the heating plant is located in an area of unusually

tight construction, or if an exhaust fan, kitchen ventilation

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¡

F mini-

■ Before permanently setting the burner in place, check

that the main burner casting and pilot ports are free of for­eign materials, and also that the spark electrode assembly
has not been damaged or displaced. See Figure 7.

FIGURE 1 Dry Base Boiler with Combustion Chamber

Liner (Warm Air Furnace Construction is Similar)

■ 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 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 ins such a manner as to prevent any difference in
the pressure between the hood or regulator and the
combustion air supply (see Figures 3 and 4). 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, If approved by local codes (see Figure 4).

■ 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.

■ Refer to gas utilization equipment manufacturer for

recommended vent connection requirements.

FIGURE 2 Wet Base Boiler with Unlined

Combustion Chamber

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 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.

FIGURE 3 Recommended Locations forDraft Hoods

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