Midco F400-33 - Manual (Page 2)

-2-
SPECIFICATIONS 1
The ECONOMITE Models 400-33 and F400-33 con-
version 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 main-
tain a pilot. Power burner design makes them perfectly
suited for oil burner replacement, including rooftop
and industrial applications
AIR DELIVERY (Approximate Air Delivery at Zero Draft)
400-33........................................................85 SCFM 2
F400-33....................................................146 SCFM 2
FIRING RATE (NATURAL or PROPANE)3
MAXIMUM 400-33......................................400 MBH 4
MAXIMUM F400-33...................................700 MBH 4
MINIMUM 400-33.......................................185 MBH 4
MINIMUM F400-33............................ÉÉ.300 MBH 4
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 1 /
2
"
F400-33 AT MAX BTU/HR.ЙЙЙЙЙЙ15" x 25"
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.
3. All Ratings Based on 1000 BTU/Cu. Ft. NATURAL, 2500
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.
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 opera-
tion, it is probable that the heating plant area has suffi-
cient 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 per-
manently 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 utili-
zation equipment in the combined space. One grille
should be located within 12 inches of the ceiling, the oth-
er within 12 inches of the floor.
■ If the heating plant 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, 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 hori-
zontal 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.
II PREPARATION OF THE GAS
UTILIZATION EQUIPMENT
■ Clean the gas utilization equipment combustion cham-
ber, heat exchanger interior, and flue connections. Re-
move all adhering tars, scale, dirt and soot. Inspect for ac-
tual or potential leaks.
■ 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 rec-
ommended.
■ 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 ex-
changer. 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 tar-
get wall may be necessary if the firing chamber is unusual-
ly 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¡F mini-
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 APPROV-
ALS. NON-STANDARD ARRANGEMENTS MAY BE AVAILA-
BLE FOR SOME MODELS-CONSULT FACTORY FOR DE-
TAILS IF REQUIRED.