TM 9-4120-398-14
a. CONDITIONED AIR (EVAPORATOR) FAN (1)- Draws air into the evaporator section and exhausts it through the
evaporator (cooling) coil and heater elements into the room or enclosure.
b. HEATER ELEMENTS (HR 1 thru HR6) (2) Consists of two banks of three elements each. Both banks are
controlled in automatic mode heating with the mode selector in AUTO.
c. FRESH AIR DAMPER (3) Provides outside air.
d. INDICATOR, SIGHT LIQUID (4) Allows visual inspection and indicates condition of liquid refrigerant when the
unit is operating in the cool mode.
e. INPUT POWER CABLE (5) - For connection of external power.
f. EXTERNAL CONTROL PANEL (6) Contains a three-position mode selector switch, a temperature control
thermostat and a pushbutton circuit breaker.
g. EVAPORATOR COIL (7) Serves as a heat exchanger by transferring heat from the air passing over the tubing and
fins to the refrigerant passing through the tubing.
h. COMPRESSOR (B3) (8) Pumps refrigerant through the system during cooling operations.
i. CONDENSER COIL (9) Serves as a heat exchanger by transferring heat from the refrigerant passing through the
tubing to the air passing over the tubing and fins.
CONDENSER COIL GUARD (10) - Protects coil from damage.
j.
k. EVAPORATOR BLOWER MOTOR (B1 ) (11) Drives the conditioned air (evaporator) fan.
l.
CONDENSER MOTOR (B2) (12) - Drives the outside air (condenser) fan.
m. CONDENSER IMPELLER (13) Draws air through the condenser coil and discharges the heated air back to the
outside during cooling operations.
n. CONDENSATE TRAPS AND DRAIN HOSE (14) The drip pan is located directly below the evaporator coil line
and is built into the casing. Its purpose is to collect condensate that drips off the evaporator coil during cooling operations.
Condensate water then empties out of the air conditioner through the drain line.
o. HIGH PRESSURE CUTOUT SWITCH (S4) (15) - Protects compressor from possible damage due to excessively
high refrigerant pressures.
p. AIR FILTER (16) Provides filtered return air.
(1-3 blank)/1-4
