700870,700875,700877
SERVICE MANUAL
16
page
Portable Air Condi oners
Capillary Tube
The capillary tube is a long thin tube
that u lizes line fl ow resistance as
an expansion valve. The length and
the inner diameter of the capillary
tube are determined according to
the capacity of the refrigera on
system, opera ng condi ons, and
the amount of refrigerant. The high
pressure, high temperature liquid re-
frigerant sent from the condenser expands rapidly as the refrigerant is sprayed
out through the fi xed orifi ce in the capillary tube. As a result, the temperature
and state of the refrigerant becomes low and mist-like, and therefore evaporates
easily.
Evaporator
The evaporator is a heat exchanger covered with
slit fi ns. Heat is removed from the air being pulled
across the evaporator by the centrifugal fan.
The resul ng cool air is expelled through the cooling
air ducts.
Accumulator
The accumulator is mounted on the suc on gas pip-
ing between the evaporator and the compressor.
The accumulator separates the liquid refrigerant
from the gas refrigerant, allowing only the gas refrig-
erant to enter the compressor. In the accumulator,
suc on gas isled into a cylindrical vessel where the
speed of the gas is decreased.
This process separates the refrigerant contained in
the gas by the force of gravity, causing the refrigerant to accumulate at the bot-
tom of the vessel. As a result, the compressor is protected from possible damage
caused by liquid refrigerant intake.
High Temp./High Pressure
Liquid Refrigerant
Low Temp./Low Pressure
Gas and Liquid Mixture
From Evaporator
To Compressor
