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 compo-
nents.
Closed-Loop cooling seals the electronics enclosure from hostile elements in the environ-
ment.Two separate circulation systems are employed.The internal system cools and dehu-
midifies the air inside the cabinet, totally isolating the sensitive electronics and other com-
ponents 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 in the condensate
tray and released to the ambient air through the drain tube or the condensate evaporator.
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.
Kooltronic Air Conditioners are designed to operate continuously in order to eliminate
compressor cycling, which shortens compressor life and causes line transients. The cool
air discharge temperature is regulated by the capacity control (hot gas bypass) valve.The
unit is equipped with a Low Temperature Thermostat to prevent over-cooling. In applica-
tions having frequent voluntary or involuntary power interruptions, a Short Cycle
Protector is recommended to allow adequate time for the internal pressures of the
Air Conditioner to equalize before restarting.
V. Principles of Operation
CONDENSER OUTLET
(Heated Ambient Air Out)
CONDENSER HEAT
EXCHANGER
CONDENSER AIR
INLET
(Ambient Air In)
REFRIGERANT
FILTER DRIER
CONTROL
BYPASS VALVE
METERING
DEVICE
(Capillary Tube
shown)
COMPRESSOR
EVAPORATOR
HEAT EXCHANGER
COOL AIR TO
ENCLOSURE
ACCUMULATOR
CONDENSER
AIR INLET
(Ambient Air In)
HEATED AIR FROM
ENCLOSURE
