TM 5-3895-374-24-1
UNIT OPERATION
FOR SYSTEM COOUNG.
1 Set thermostat system switch to "COOL,’ and set
thermostat fan switch to "AUTO" (Intermittent air) or to
"ON" (continuous air)
2 Position thermostat temperature selector below
existing room temperature, and check for discharge of
cool air at the supply registers
3 Allow cooling system to operate for several minutes,
and check to following
(s) Compressor and fan should cycle on and off with
thermostat
(s) Blower should run and cycle with thermostat unless
fan switch Is set in continuous "ON" position
FOR SYSTEM HEAT
1 Set thermostat system switch to "HEAT,’ and set
thermostat fan switch "AUTO" (Intermittent air) or to
"ON" (continuous air)
2 Position thermostat temperature selector above
existing room temperature, and check the following:
(s) Compressor and outdoor fan should not run
(s) Heating elements should energize (check for warm
discharge air at supply registers)
(s) Blower should run and cycle with thermostat unless
fan switch is set in continuous "ON" position
UNIT MAINTENANCE
WARNING
Disconnect power at main supply panel before doing any
of the following maintenance. Do not attempt correction
of any electrical problems requiring removal of control
panel cover. Call an authorized serviceman of service, if
needed. (Refer to the “Service Center List” provided with
the unit in the “Home Owner’s Envelope”).
1. Regularly vacuum or replace air filter KEEP FILTER
CLEAN The air passing Into the unit must be as clean
as possible If dirt particles accumulate around the coils, it
will cause a serious loss of cooling or heating output.
The air filter should be cleaned every month or two,
depending on how much dirt accumulates Be sure to
replace filter In its original position
2. Once every year, clean on and around blower motors
If motors have oil tubes, apply 6 drops of SAE 20 non-
detergent motor oil to each tube Do not over oil or oil
motor if not factory equipped with oil tubes
3. FUSES Replace if needed with only Class "K" or "RK"
fuses of same rating as factory supplied fuses Repeated
fuse failure Indicates need for appliance service Have a
qualified serviceman inspect unit (Refer to the exploded
view parts list provided with this unit for order numbers of
replacement filters and fuses)
IMPORTANT
THESE PROCEDURES MUST BE FOLLOWED AT
INITIAL START-UP AND AT ANY TIME POWER HAS
BEEN REMOVED FOR 12 HOURS OR LONGER
TO PREVENT COMPRESSOR DAMAGE WHICH MAY
RESULT FROM THE PRESENCE OF LIQUID
REFRIGERANT IN THE COMPRESSOR CRANKCASE
1 MAKE CERTAIN THE ROOM THERMOSTAT IS IN
THE "OFF" POSITION (THE COMPRESSOR IS NOT
TO OPERATE)
2 APPLY POWER BY CLOSING THE SYSTEM
DISCONNECT SWITCH THIS ENERGIZES THE
COMPRESSOR HEATER WHICH EVAPORATES THE
LIQUID REFRIGERANT IN THE CRANKCASE
3. ALLOW 4 HOURS OR 60 MINUTES PER POUND OF
REFRIGERANT IN THE SYSTEM AS NOTED ON THE
UNIT RATING PLATE, WHICHEVER IS GREATER.
4 AFTER PROPERLY ELAPSED TIME THE
THERMOSTAT MAY BE SET TO OPERATE THE
COMPRESSOR
5 EXCEPT AS REQUIRED FOR SAFETY WHILE
SERVICING - DO NOT OPEN SYSTEM DISCONNECT
SWITCH
(page 3-492)
