TM9-4120-400-14
1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - continueds
3 CONDITIONED (EVAPORATOR) AIR FAN. Draws the room or enclosure air in over the filter and blows it
out over the evaporator and heaters to supply conditioned air. The speed is adjustable. See Item 16.
4 TEMPERATURE SELECTOR (THERMOSTAT) SENSING BULB. Senses the temperature of the room or
enclosure air as it is drawn back into the air conditioner. This bulb is part of the TEMPERATURE SELECTOR
control (thermostat) that is located on the control panel module.
5 CONDITIONED AIR FILTER. Filters room or enclosure air as it is recirculated.
6 CONDITIONED AIR FAN MOTOR. Drives the conditioned air fan.
7 RETURN AIR LOUVER WITH FILTER CLAMPS. The recirculated air from the room or enclosure is drawn
in through this louver. The conditioned air filter, item 5, is mounted on clips on the inside of this louver.
8 JUNCTION BOX AND CONTROL PANEL MODULE. Contains major unit controls. See items 9 thru 16 for
a description of some of these controls.
9 CONTROL CIRCUIT BREAKER. Protects control circuit.
10 INPUT POWER RECEPTACLE (PRIMARY LOCATION). Connection point for main input power cable.
See item 37 for alternate receptacle.
11 CONTROL PANEL MODULE. Contains switches and controls for operating the air conditioner. See
items 13, 14, 16 and 17 for a description of these switches and controls.
12 HIGH REFRIGERANT PRESSURE CUTOUT SWITCH. This switch is factory set to shut the compressor off
if the refrigerant discharge line pressure rises to 470 to 490 psig (33.04 to 34.45 kg/cm2).
NOTE
This switch must be hand reset after the pressure drops to 320 psig (22.50 kg/cm2).
13 COMPR CIRCUIT BKR (Compressor Circuit Breaker). Protects the compressor.
14 MODE SELECTOR SWITCH. Allows selection of unit operating mode.
15 LOW REFRIGERANT PRESSURE CUTOUT SWITCH. This switch is factory set to shut the compressor off
if the refrigerant suction line pressure drops to 10 to 20 psig (0.703 to 1.406 kg/cm2. This switch must be hand
reset after the pressure rises above 40 psig (2.812 kg/cm2).
16 EVAPORATOR FAN SPEED. Allows selection of HIGH or LOW unit
conditioned air (evaporator) fan speed.
17 TEMPERATURE SELECTOR (THERMOSTAT) SWITCH. This switch allows selection of the desired
temperature while operating in the cool or heat modes.
18 GROUND CONNECTION POINT. Shelter or van electrical ground connection point.
19 CONDENSER DISCHARGE AIR LOUVER ASSEMBLY. This louver assembly is automatically controlled
by the actuating cylinder, item 39.
20 CONDENSER AIR INLET GUARD. This expanded metal screen protects the condenser from damage.
21 FRESH AIR VENTILATION GUARD. Screens and filters fresh air entering the unit.
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