Carrier Supra 650 Service Manual download pdf (Page 23)

1--10

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h. Filter Drier

The drier is cylinder shell containing a drying agent and

screen. It is installed in the liquid line and functions to

keep the system clean and remove moisture from the

refrigerant. A sight glass may also be installed down-

stream of the drier. The sight glass is fitted with a paper

element that changes color to indicate moisture content.

i. Receiver

Liquid refrigerant from the condenser drains into the

receiver. The receiver serves as a liquid reservoir when

there are surges due to load changes in the system; as a

storage space when pumping down the system and as a

liquid seal against the entrance of refrigerant gas into

the liquid line.

The receiver is provided with two bullseye sight glasses,

for the observation of liquid level, and a pressure relief

valve.

1.4 EVAPORATOR SECTION

The evaporator section contains the evaporator coil,

expansion valve (TXV), heat exchanger, defrost ter-

mination thermostat(s) and electrical evaporator fan

motors.

1.4.1 Thermal Expansion Valve

The thermal expansion valve is an automatic device

which controls the flow of liquid to the evaporator ac-

cording to changes in superheat to the refrigerant leav-

ing the evaporator. The thermal expansion valve main-

tains a relatively constant degree of superheat in the gas

leaving the evaporator regardless of suction pressure.

Thus, the valve has a dual function; automatic expan-

sion control and prevention of liquid return to the com-

pressor.

1.4.2 Heat Exchanger

The heat exchanger is of the tube in tube type con-

nected in the main suction line and liquid line. Within the

heat exchanger, the cold suction gas is used to cool the

warm liquid refrigerant. This results in greater system

capacity and efficiency.

1.4.3 Evaporator Coil

The evaporator coil is a tube and fin type. The operation

of the compressor maintains a reduced pressure with

the the coil. At this reduced pressure, the liquid refriger-

ant evaporates at a temperature sufficiently low enough

to absorb heat from the air. Air movement over the

condenser is provided by two or three electric fans.

1.4.4 Electric and Water Heat

The unit can be equipped with Electric Heat, Water

Heat, and Electric/Water heat. See Figure 1-12. When

the controller calls for heat, the heater contactor will

close or valve will open and engage the heat system.

Water Heat Coil

UNIT CONTROL BOX

Electric

Heat

Elements

1. Water Valve

2. Water Tube (HWH)

3. Hose (HWH)

4. Harness (HWH)

ELECTRIC HEAT CONTROL BOX

HOT WATER HEAT COMPONENTS

Figure 1-12. Water and Electric Heat Components

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Comments to this Manuals

Hermes Hurtado 13 Mar 2025 | 11:43:58

Soy mecánico mantenedor. Necesito manuales técnicos

Carrier Supra 650 Service Manual Page 23

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