LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.-Continued

TM5-4120-384-14

1-6. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.-Continued

PRESSURE REGULATING VALVES.

These valves regulates the

suction pressure by recirculating a part of the compressor

discharge hot gas to the suction line when the suction pressure

This action prevents frosting of the

drops below a preset value.

evaporator coil.

EXPANSION VALVE.

Meters refrigerant flow to the

evaporator

during cooling cycles when operating in the COOL mode.

EVAPORATOR COIL.

Similar in construction to the multiple-

This coil serves as a heat exchanger

tube, finned condenser coil.

for the refrigerant to absorb heat from the room or enclosure air

circulated through the evaporator section.

HEATING ELEMENTS.

Consists of two banks of heating elements.

Both banks operate

Only one bank operates in the "LOW HEAT" mode.

i n t h e "HIGH HEAT" mode.

One bank shuts off when the thermostat is

satisfied in both HIGH and LOW HEAT modes.

MIST ELIMINATOR.

The purpose of the mist eliminator is to

trap droplets of condensed water from the evaporator so that they

will not be blown into the air conditioned space.

INPUT POWER RECEPTACLE (ALTERNATE LOCATION). The main power

See item 10 for primary location.

cable may be connected here.

See installation instructions for switch over instructions if this

power receptacle is used.

REFRIGERANT SIGHT GLASS.

Visually indicates the condition

the refrigerant flowing in the refrigerant lines during cooling

cycles when operating in the COOL mode.

ACTUATING CYLINDER.

This hydraulic cylinder operates

I t w i l l s t a r t t o o p e n2 t h e l o u v e r

discharge louver assembly.

assembly at 150 to 180 psig (10.55 to 12.66 kg/cm ) and

fully open

louver assembly at 220 to 260 psig (15.74 to 18.28 kg/cm )

compressor discharge pressure to allow unit operation when outside

temperature is low.

RESTRICTOR.

Divides the expanding

refrigerant

three

circuits of the evaporator coil.

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