Scotsman NSE654 Service Manual download pdf (Page 13)

NSE654

January 2000

Page 13

OPERATION: Refrigeration

Beginning at the compressor, the refrigerant is

compressed into a high temperature gas. The

discharge line directs this gas to the condenser. At

the condenser (air or water cooled) the gas is

cooled by either air or water and it then condenses

into a liquid. This high pressure liquid then goes

through the liquid line to the expansion valve. The

thermostatic expansion valve meters liquid

refrigerant into the evaporator, the volume of liquid

refrigerant depending upon the temperature of the

evaporator; warmer evaporators get more

refrigerant and colder evaporators get less. At the

evaporator, the refrigerant enters an area of

relatively low pressure, where it can easily “boil off”

or evaporate. As it evaporates, it absorbs heat

from the evaporator and whatever is in contact with

it (such as the water inside it). After the

evaporator, the refrigerant, now a low pressure

vapor, goes through the suction line back to

compressor, where the cycle is repeated.

CONDENSER

FAN

MOTOR

LIQUID

LINE

THERMOSTATIC

EXPANSION

VALVE

SUCTION LINE

EVAPORATOR

GEAR

MOTOR

COMPRESSOR

DISCHARGE

LINE

Refrigeration Schematic

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Scotsman NSE654 Service Manual Page 13