Movincool Office Pro 10, Service Manual

Page: 19 / 56

REFRIGERANT SYSTEM
11
HIGH TEMP. / HIGH PRESS.
LIQUID REFRIGERANT
LOW TEMP. / LOW PRESS.
GAS AND LIQUID MIXTURE
FROM EVAPORATOR
TO COMPRESSOR
Capillary Tube
Accumulator
3. Capillary Tube
The capillary tubes are long thin tubes utilizing
line flow resistance to serve as an expansion
valve. The length and the inner diameter of the
capillary tubes are determined by the capacity of
the refrigeration system, specified operating
conditions, and the amount of refrigerant.
The capillary tubes cause the high pressure, high
temperature liquid refrigerant sent from the
condenser to expand rapidly as the refrigerant is
sprayed out through the fixed orifice in the
capillary tubes. As a result, the temperature and
state of the refrigerant become low and mist-like
respecitively, causing it to evaporate easily.
4. Evaporator
The evaporator, like the condenser, is a heat
exchanger utilizing plate fins. Heat is removed
from the air being pulled across the evaporator
by the centrifugal fan and the resulting cool air is
expelled through the cool air vent.
5. Accumulator
The accumulator is mounted on the suction gas
piping between the evaporator and the compres-
sor. The accumulator separates the liquid refriger-
ant from the gas refrigerant letting only the gas
refrigerant enter the compressor. In the accumu-
lator, suction gas is led into a vessel having a
cylindrical body, and the gas speed is decreased
inside the vessel. This separates the refrigerant
contained in the gas by the force of gravity
causing it to accumulate at the bottom of the
vessel. This protects the compressor from
possible damage caused by the intake of liquid
refrigerant.