bypass circuit and opens when the compressor suction pressure drops below a preset level of 58 psig
(4.07 kg/ cm2).
RELIEF VALVE: The relief valve opens when the discharge line pressure rises above
555 psig (39.02 kg/ cm2).
Z CHARGING VALVES: The charging valves provide connection ports so that refiigerant can
be put into system. They also provide ports for checking system operating pressures.
Z EVAPORATOR/CONDENSER FAN MOTOR: This motor drives the condenser impeller
which draws outside air over and through the condenser coil in order to remove the heat from the
hot gas entering the condenser coil. This motor also drives the evaporator impeller which draws air
through the air filter, over the evaporator coil and exhausts it into the conditioned area.
CONDENSER GUARD: The guard protects the condenser coil from damage.
RECEIVER: The receiver is a storage tank for liquid refrigerant.
GROUND CONNECTION: The ground connection is an external point where shelter or van
electrical ground is connected to the air conditioner.
Z SIGHT GLASS, LIQUID INDICATOR: The condition of liquid refrigerant flowing through
the system can be observed through this window when the compressor is operating in the cooling
mode. A milky or bubbly appearance of the refrigerant indicates that the system contains
insufficient refrigerant, and that more must be added. The center of the sight glass has an area
which indicates moisture content of the refrigerant. This area will change colors: green,
yellow/green, and yellow.
Replace drier/filter and refrigerant
CONDENSATE DRAIN PLUG: Drain connection for water collected below evaporator coil.
FRESH AIR INLET SCREEN: This screen cleans outside air drawn into the shelter.
FAN GUARD: The guard protects individuals from fan and protects fan from damage.