I Combination Units
Economizer Plug
A pre-wired economizer plug is located just inside the return air
opening. See Page 12 for more information about the economiz-
er.
Starting the Unit After Shutdown
Heating
1. Set thermostat to OFF.
2. Remove burner compartment access panel. Locate gas
control valve knob (NO TAG), and turn to OFF. Wait 5 min-
utes.
3. Turn gas control knob to ON. (Honeywell valve must be de-
pressed to turn). Replace burner compartment access
panel. Turn manual gas valve to supply pipe ON.
4. Turn electric power ON.
5. Set thermostat to HEAT and to desired temperature. Unit
will come on and operate automatically under control of the
thermostat, Never attempt to light the pilot manually.
Fire and/or explosion hazard
Do not operate the unit on heating (except during ser-
vice checks) unless all access panels are securely fas-
tened in place. Abnormal and possibly hazardous
burner operation could result.
Failure to follow this warning can result in property
damage, personal injury, and/or death.
Installation Instructions
may run continuously for several hours or longer on the initial run
because of residual heat and moisture in the house. This is nor-
mal for any air conditioning system.
CAUTION
Do not operate on cooling when outdoor temperature is be-
low 40°F. This is necessary to prevent possible damage to
the compressor.
Turning The Unit Off
1. Set the thermostat switch and OFF fan switch to AUTO. To
restart, set to HEAT or COOL and temperature desired.
2. To shut the unit down completely, turn electric power OFF
Turn manual gas valve off.
CAUTION
To prevent heat exchanger damage, wait at least 2 minutes
after blower stops before shutting off power to unit.
NOTE: If the furnace overheats or fails to shut off, turn OFF the
manual gas valve for the furnace then wait at least 2 minutes be-
fore turning off electric power.
Thermostat Fan Switch Operation
With the selector switch in the ON position the circulating air blow-
er will run continuously (after the 30 second delay) at the speed
used for cooling. In the AUTO position the blower will only be on
during each heating or cooling cycle.
CAUTION
Some units use a lower blower speed for cooling than for
heating. Do NOT position selector switch to ON for continu-
ous operation during heating cycle if the cooling blower
speed is lower than the heating speed. Blower speeds for
each model are listed on the units Tech Label.
Cooling
Set thermostat to desired temperature and set system switch to
COOL. The unit will come on and operate automatically under
control of the thermostat. Close all doors and windows. The unit
Adjusting Room Temperatures
If the temperature in individual rooms is not as desired, balance
the system by adjusting the dampers in the branch ducts. Adjust a
little at a time and wait a day after each change to judge the effect.
Once the dampers are adjusted for normal weather conditions, it
is best to leave them that way. Compensate for temporary weath-
er changes by adjusting the thermostat setting.
10. Maintenance
Monthly Maintenance and Inspection
Checks
Air Filters
CAUTION
Do NOT operate without air filters.
Inspect filters at least monthly and replace or clean as required.
Washable filters may be cleaned by soaking in mild detergent and
rinsing with cold water. Replace filters with the arrows on the side
pointing in the direction of air flow. Dirty filters are the most com-
mon cause of inadequate heating or cooling performance, and of
compressor failures.
50901 110202
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