V. Principles of Operation
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. These Air Conditioners utilize a
"Closed-Loop Cooling System" to ensure optimum
performance of the installed components.
Closed-Loop cooling seals the electronic 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 in the condensate tray and removed
through the drain tube to the condensate evaporator.
Condensate evaporates in the condensate evaporator
and is released to the ambient air by the condenser
impeller.
The heat removed through the evaporator coil is transferred by the compressed refrigerant to the condenser
coil. Ambient air is then passed through the condenser coil, where it absorbs the heat and is then discharged
to the environment.
This unit is equipped with Cooling (Low Temperature) and Heating thermostats. The factory Cooling
thermostat setting is 92°F with a differential of 7°F. When the temperature inside of the enclosure rises
above 99°F the air conditioner will run in Cooling Mode. When the temperature inside of the enclosure
drops below 92°F the air conditioner will shut off. The factory Heater thermostat setting is 45°F with a
differential of 5°F. When the temperature inside of the enclosure drops below 40°F the air conditioner will
run in Heating Mode. When the temperature inside of the enclosure exceeds 45°F the air conditioner will
shut off. The Cooling and Heating thermostats are interlocked, so that the air conditioner cannot run in
Cooling and Heating Mode simultaneously. The Condenser Impeller is controlled by a pressure switch. At
medium ambient temperature below 75°F the Condenser Impeller will cycle. When the air conditioner
starts in Cooling Mode the Condenser Impeller will remain off for about four (4) to seven (7) minutes,
until the discharge refrigerant pressure builds up. The Cooling thermostat is equipped with a three (3)
minute time delay on start-up to prevent compressor short cycling.
COOL AIR TO
E
N
CLOSURE
HEATED AIR
FROM
E
N
CLOSURE
CO
N
DE
N
SER
(Heated Am
b
ient
OUTLET
Air O
u
t)
CO
N
DE
N
SER
AIR I
N
LET
(Am
b
ient Air In)
CO
N
DE
N
SER
(Heated Am
b
ient
OUTLET
Air O
u
t)
CO
N
DE
N
SER
(Heated Am
b
ient
OUTLET
Air O
u
t)
5
KAC4P3777R
Содержание KAC4P3777R
Страница 11: ...11 Wiring Schematic WD 1327 KAC4P3777R WD 1327...
Страница 12: ...12 Wiring Schematic WDNCRMAN KAC4P3777R WDNCRMAN...
