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Generally, a room thermostat should be set at the lowest temperature that is
comfortable to the building occupants. This will result in the lowest cost to heat the
building.
Combustion Chamber
The furnace combustion chamber is a hollow, circular cylinder sealed at the bottom end
and open at the top end. The chamber is made of a lightweight, insulating, "soft",
refractory material. The refractory material is composed of organically bound, alumina-
silica fibers that provide a high temperature region for combustion of the oil to occur.
Oil Burner and Oil Nozzle Installation
c CAUTION: This oil furnace is designed to use No. 2 distillate fuel (home
heating) oil only.
This furnace is designed to utilize the following specially modified, oil burner:
• R.W. Beckett Corp. model AF burner, specification # EFL-101
• R.W. Beckett Corp. model NX burner, specification # EFL-301
NOTICE: NO other burners may be used in this application.
The heat output from the furnace is fixed, based on the size of nozzle installed in the oil
burner. Four (4) heat input rates are permissible: 85,000, 105,000, 120,000, and
140,000 BTUH.
Nozzle selection (i.e. heating capacity of the furnace) shall be based on a rate of heat
loss (heating load) calculation for the building. These calculations should be made
according to the manuals provided by the Air Conditioning Contractors of America
(ACCA) or the American Society of Heating, Refrigeration and Air Conditioning
Engineers, Inc. (ASHRAE).
Refer to the Residential Load Calculation, Manual J, from the ACCA, and the ASHRAE
Handbook Fundamentals volume, from ASHRAE, for the recommended procedure to
compute the design heating load of a residence. To obtain copies of these publications
for a fee, contact the ACCA and the ASHRAE at the addresses given in Appendix A of
this manual.
The oil burner was installed in the furnace at the factory. In the field, if it is necessary to
adjust the heating capacity of the furnace by changing the oil burner nozzle, refer to the
following instructions. Also, consult the oil burner manufacturer's operating instructions
(included with the burner) for detailed instructions on this procedure.
The oil nozzle is factory installed in the oil burner. The gun/electrode assembly
1)
with nozzle may be removed from the rear of the burner assembly without
removing the oil burner from the furnace. To access the gun/electrode assembly,
loosen two (2) machine screws and clamps holding the burner ignition
transformer in position. Rotate the transformer forward and out of the way.
15
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