Midco F400B-33 - Manual (Page 2)

SPECIFICATIONS
Standard burners are shipped as NATURAL gas models.
A kit is available for field conversion to PROPANE gas.
AIR DELIVERY (Approximate Air Delivery
at Zero Draft Maximum Firing)………………...146 SCFM 1
MAXIMUM FIRING RATE 2 ……………………………700 MBH 3
MINIMUM FIRING RATE 2 …………………………….300 MBH 3
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
700 MBH………………………………15" W x 25" L
ELECTRICAL SUPPLY……120/1/60…10 Amp dedicated
service
FLAME SAFETY………Intermittent proven pilot ignition,
Electronic Safety
1. SCFM=Standard Cubic Feet/Minute.
2. 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.
3. 1 MBH=1,000 BTU/Hr.
One Gallon of Fuel Oil=140 MBH.
PART 1 INSTALLATION
CAUTION: The ECONOMITE F400B-33 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
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.
■ ■ 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, 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/CGA 1-B149.1 or .2 and/or local codes.
II PREPARATION OF THE GAS
UTILIZATION EQUIPMENT
■ ■ Clean the gas utilization equipment, combustion
chamber, heat exchanger interior and flue connections.
Remove all adhering tars, scale, dirt and soot. Inspect for
actual or potential leaks.
■ ■ Cement all joints, including those in the gas utilization
equipment 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.
FIGURE 1 Dry Base Boiler with Combustion Chamber
Liner (Warm Air Furnace Construction is Similar)
FIGURE 2 Wet Base Boiler with Unlined
Combustion Chamber
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