• Measure the outlet air temperature at a point approximately twelve to eighteen (12 -18) inches
from the supply air duct opening of the furnace. It may be necessary to measure the outlet air
at several places to obtain an accurate average. NOTE: IF AN AIR CONDITIONING COIL IS
INSTALLED TAKE CARE SO AS NOT TO DAMAGE THAT COIL.
• Adjust the temperature by changing circulating air blower speed tap.
I MOTOR LUBRICATION AND MAINTENANCE ]
The circulating air blower is equipped with sleeve bearings which are permanently lubricated by
the motor manufacturer and require no lubrication. At the time of the monthly filter inspection
clean the exterior of the circulating air motor, especially around the perimeter air holes to prevent
the possibility of overheating due to an accumulation of dust or dirt on the windings and motor
casing. As suggested elsewhere in these instructions, the air filters are to be kept clean. Dirty
filters will restrict the air flow over the motor windings and possibly cause an overheating
condition. The venter motor has bearings which are prelubricated by the motor manufacturer and
require no attention.
I SERVICE INSTRUCTIONS ]
• DO keep the circulating air filters clean. The heating system will operate more efficiently and
economically.
• DO arrange drapes and furniture so that the supply air registers and return air grilles are
unobstructed.
• DO close doors and windows. This will reduce the heat load on the system.
• DO avoid excessive use of bathroom and kitchen exhaust fans.
• DO NOT let heat generated by televisions, lamps, direct sunlight, etc. influence the thermostat
operation.
• Exclusive of the mounting platform, keep all combustible materials at least three (3) feet from
the furnace.
• DO NOT use the furnace room as a storage area.
• DO NOT store gasoline or other flammable liquids or vapors in the vicinity of the furnace.
I SEQUENCE OF OPERATION ]
This appliance is controlled by the thermostat. Within this section, the term lockout is referenced.
This lockout is a "soft" lockout which will reset after one hour. It is the obligation of the installer to
educate the user on the proper use of the thermostat and the sequence of operation in both the
heating and cooling modes. It is also important that any repair or service be performed by a
QUALIFIED service person, not by the user.
HEATING MODE
• The furnace control checks for an open main limit (this limit is in the normally closed ). If the
limit is open, the furnace will remain inoperable until the limit is closed. During an open limit
the circulating air blower will be energized. The status light will blink four (4) times.
• The room thermostat reacts to a demand for heat.
• The control will then check to insure that the vent pressure switch is open. If, at this point, the
vent pressure switch is closed the control will blink two (2) times and will remain inoperable
until this situation is corrected.
• The venter blower is energized.
IO-151 18
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