Midco 400B-02 - Manual (Page 2)

Notes:
* Model 400B-02P is equipped with a 4-Function Redundant Main Automatic Valve.
** SCFM=Standard Cubic Feet/Minute
*** Ratings based on 1,000 BTU/cu. ft. NATURAL, 2,500 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.
CAUTION: The ECONOMITE 400B-02(P) is not intended for outdoor installa-
tion and must be protected from excessive moisture. Provide adequate clear-
ance for service and proper operation.
If the former automatic oil burner gave trouble-free operation, it is probable that the gas utiliza-
tion 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 (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.
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 build-
ing, provision must be made for an outside air supply near the gas utilization equipment 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.
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.
Specifications
2
Model 400B-02 NATURAL Gas only
Model 400B-02P PROPANE Gas*
Air Delivery
(Approximate air delivery at zero draft)
Maximum Firing Rate***
Minimum Firing Rate***
Tube Diameter
Tube Length
Minimum Combustion Chamber Size
400 MBH
300 MBH
200 MBH
Gas Pressure Required
NATURAL
PROPANE
Standard Voltage
Pilot Safety
85 SCFM**
400 MBH****
200 MBH****
4 inches
9 inches
10" W x 16 1 /
2
L or 15" dia.
9" W x 14" L or 13" dia.
7" W x 11" L or 10" dia.
5.0" to 14.0" W.C.
11.0" to 14.0" W.C.
120 Volts 60 Cycle
Thermoelectric, 100% shut-off
I Ventilation
II Preparation of the Gas
Utilization Equipment
Part 1 Installation