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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 blower. 

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 a Low Temperature Thermostat to prevent the evaporator coil from freezing. In
conditions of low ambient temperature and low enclosure load, the thermostat regulates the return air
temperature from 75°F to 86°F. The standard set point of the Low Temperature Thermostat is 75°F. The
set point can be changed to 70°F or to 79°F by changing the location of the thermostat jumper (See
illustrations on page 8).

The Low Temperature Thermostat has a test start relay. When the air conditioner is turned on it will run
constantly for the first 15 minutes regardless of external temperatures. Afterwards, if the entering evaporator
air temperature is lower than the thermostat set point, the compressor and condenser blower will stop, and
the thermostat will begin to control the air conditioner.

The heater kit consists of a heater, a heat control thermostat and a heater limiter. The heater control
thermostat is a bimetal disk with a fixed set point of 60°F.  When the entering evaporator air temperature rises
above 60°F the heater shuts off, and when the evaporator air temperature falls below 40°F the heater will
engage. The contact points of the alarm thermostat are normally closed. If the entering evaporator air
temperature exceeds 130°F the alarm thermostat contacts open, and when the temperature drops below
130°F the contacts close. 

A condenser blower switch is standard on this unit. When the ambient temperature is above 95°F the
condenser fan will run at full speed. When the ambient temperature is lower than 95°F the condenser fan will
cycle. In applications having frequent voluntary heat load fluctuations, an optional Compressor Short Cycle
Protector is recommended. 

When the Kooltronic Air Conditioner is properly sized it should operate constantly and maintain 75°F to
115°F enclosure temperature, depending on the ambient temperatures.

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K2A6C12HTL

Summary of Contents for K2A6C12HTL

Page 1: ...S MANUAL BE READ AND UNDERSTOOD THOROUGHLY KOOLTRONIC INC 30 Pennington Hopewell Road Pennington NJ 08534 609 466 3400 FAX 609 466 1114 www kooltronic com 900 039 66 1 19 CDR 20131 LARGE HORIZONTAL TO...

Page 2: ...the specific model page of the Kooltronic website I Introduction Kooltronic Air Conditioners are designed to provide a cool dehumidified environment for your electronic components There are models to...

Page 3: ...s prior to operating in order to allow the compressor oil to drain to the compressor sump area CAUTION 3 Before operating this unit all electrical wiring must be checked to assure the proper connectio...

Page 4: ...e that the power source matches these requirements y Use of incorrect type or amount of refrigerant will adversely affect performance and may damage the unit r Make sure that these parameters are met...

Page 5: ...mostat to prevent the evaporator coil from freezing In conditions of low ambient temperature and low enclosure load the thermostat regulates the return air temperature from 75 F to 86 F The standard s...

Page 6: ...ning after three 3 to five 5 minutes 7 Operate the air conditioner for approximately ten 10 minutes During this period no unusual noise or vibration should be evident Both the evaporator and condenser...

Page 7: ...lets and outlets is essential for optimum performance of the Air Conditioner Place supplied gasket on perimiter of enclosure cutouts All externally mounted Air Conditioners must be fully gasketed to e...

Page 8: ...to change 2 06 52 3 17 4 3 2 60 66 0 2 1 1 2 4 3 J2 3 4 5 10 9 8 7 6 1 2 3 J1 CG RELAY CONTACTS N O 240 VAC 120 VAC TEMPERATURE SENSOR Mounting Holes 4 156 3 9 DIA ADJUSTING PINS 3 2 1 4 70 F Connect...

Page 9: ...6 8 1 17 29 7 31 08 789 4 70 17 7 16 15 410 2 12 90 327 6 3 62 91 9 15 83 402 0 12 32 312 9 87 22 0 1 2 3 4 Drawings and Dimensions con t K2A6C12HTL Dimensions inches mm are for reference only and are...

Page 10: ...12HTL Part Part Number Compressor 0665 401 Compressor Run Capacitor 0452 54 Condenser Motor 0261 80 Condenser Motor Capacitor 0452 06 Evaporator Impeller 0194 15 Evaporator Impeller Capacitor 0452 73...

Page 11: ...the filter clears the upper filter retainer 2 After removal the filters should be flushed under warm running water with the clean side up driving contaminants out the dirty side of the filter If the...

Page 12: ...onditioner from equipment controller or enclosure I Conform to the applicable provisions of PROCEDURE FOR PROPER PACKING AND SHIPMENT OF KOOLTRONIC AIR CONDITIONERS in this manual under Section III PR...

Page 13: ...or and Evaporator Blower Check Blower Capacitor are running Condenser Blower does Replace Condenser Blower not run Failed Condenser Blower Replace Condenser Blower Thermostat Thermostat or Sensor Repl...

Page 14: ...eceived by customer Number of parts to be returned Product description model and serial number Reason for return Action requested Contact name telephone FAX numbers and e mail address Pack unit in a s...

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