MovinCool Office Pro 63 Service Manual - Manual (Page 18)

Operation Section
18
5.3 Condenser
• The condenser is a heat exchanger with copper tubes that are covered with thin aluminum
projections called plate fins.
• Heat is given off and absorbed by air being pulled across the condenser fins by the centrifugal
fan and then expelled through the exhaust air duct.
5.4 Capillary Tube
• The capillary tube is a long thin tube utilizing
line flow resistance to serve as an expansion
valve. The length and the inner diameter of the
capillary tube are determined by the capacity of
the refrigeration system, specified operating
conditions, and the amount of refrigerant. The
capillary tube causes 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 tube. As a result, the temperature and
state of the refrigerant becomes low and mist-like respectively, causing it to evaporate easily.
5.5 Evaporator
• The evaporator, like the condenser, is a heat exchanger covered with 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.
5.6 High Pressure Switch
• The high pressure switch prevents the
condenser and compressor from being
damaged by excessively high pressure in the
high pressure line of the refrigeration cycle.
The switch is normally closed. The snap disk
responds to the variations in pressure and, if
pressure is abnormally high, the snap disk
moves down to push the pin down, causing the
internal contacts to open. This interrupts the
ground signal at the control board (J104 connector) which turns the compressor off.
• Possible causes of this trouble include:
- The condenser air filter is dirty, restricting air flow.
- The condenser blower is defective.
I001887
High Temp./High Pressure
Liquid Refrigerant
Low Temp./Low Pressure
Gas and Liquid Mixture
I001768
Pressure of Refrigerant
Movable Point
Snap Disk
Pin
Terminal
Lead Wires
Stationary Point
Molding by Resin
Case