5
Kooltronic Air Conditioners are required when the equipment operating temperature must be
kept near or lower than the ambient room temperature, and/or the cabinet must be sealed from
dust, fumes, oil, corrosives and other contaminants. This Air Conditioner utilizes a "Closed-Loop
Cooling System" to ensure optimum performance of the installed components.
Closed-Loop cooling seals the electronics enclosure from hostile elements in the environment.
Two separate circulation systems are employed. The internal system cools and dehumidifies the
air inside the cabinet, totally isolating the sensitive electronics and other components from the
environment. The external system uses circulating ambient air or water to discharge the heat
removed from the electronics.The heat is dissipated from the enclosure by means of the vapor
compression refrigeration cycle. This takes place in a hermetically-sealed refrigeration system,
utilizing either an air-cooled or water-cooled condenser heat exchanger. The warm air inside the
enclosure is drawn through the evaporator coil where it is cooled, dehumidified and returned.
Any enclosure moisture accumulated on the evaporator coil is collected and evaporated in the
condensate evaporator tray and released to the ambient air by the condenser blower. If latent
heat exceeds 25% of the total cooling capacity excess condensate is released to the ambient
through the drain tube.
The heat removed through the evaporator coil is transferred by the compressed refrigerant to
the condenser coil. Ambient air or water is then passed through the condenser coil, where it
absorbs the heat and is then discharged to the environment.
The unit is equipped with a Low Temperature Thermostat to prevent the evaporator coil from
freezing. A high head pressure switch is standard on this unit and prevents the evaporator
coil from freezing under low ambient temperature. The crankcase compressor heater allows
the unit to start with an ambient temperature of 0°F. In applications having frequent voluntary
heat load fluctuations, an optional Compressor Short Cycle Protector is recommended.
EVAPORATOR
HEAT EXCHANGER
CONDENSATE
EVAPORATOR TRAY
CONDENSER HEAT
EXCHANGER
CONDENSER OUTLET
(Heated Ambient Air Out)
COMPRESSOR
CONDENSER
AIR INLET
(Ambient Air In)
ACCUMULATOR
REFRIGERANT
FILTER DRIER
HEATED AIR FROM
ENCLOSURE
COOL AIR TO
ENCLOSURE
M/TAB
V. Principles of Operation
