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Principles of Operation (con’t)

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 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.
Temperature on the thermostat display is 5°F higher than the return temperature from the enclosure. The low
temperature thermostat set point is 75°F. The set point can be adjusted. Consult with Kooltronic if the set point
needs to be adjusted below 80°F. 

The optional heater 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 heater limiter features a manual reset. This unit is
equipped with a Temperature Alarm, which has normally-closed and normally open contacts, and a set point of 115°F. This unit
is equipped with a high pressure switch. When abnormal conditions are detected, the switch shuts off the compressor. 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.

CONTROL ACTION

The evaporator blower operates continuously. The compressor is cycled on and off by the action from the factory preset
programmable thermostat. A pressure switch controls the on/off action of the condenser blower.

The regulation is performed according to the temperature measured by the thermostat probe with a positive differential from the
set point: if the temperature increases and reaches set point plus differential the compressor is started and then turned off when
the temperature reaches the set point value again.

In case of fault in the thermostat probe the start and stop of the compressor are
timed through preset parameters.

The programmable thermostat is located as shown in the upper right ISO
illustration. WARNING: the programmable device is preprogrammed and set at the
factory. In the event changes are needed the following instructions can be used.

PROGRAMMABLE
THERMOSTAT

CONDENSER
AIR OUT

CONDENSER
AIR IN

RETURN
AIR IN

SUPPLY
AIR OUT

7

HL56LV

FRONT PANEL LED INDICATORS

- To display target set point; in programming mode it selects a parameter or confirms an operation.

(UP)

- To see the max. stored temperature; in programming mode it browses the parameter codes or increases the displayed value.

(DOWN)

- To see the min. stored temperature; in programming mode it browses the parameter codes or decreases the displayed value.

- To switch the instrument off, if onF = oFF.

- Not enabled.

(DEF)

- To start a manual defrost.

KEY COMBINATIONS

To lock and unlock the keyboard.

To return to the room temperature display.

To enter programming mode.

FRONT PANEL COMMANDS

Содержание Hazardous Location K3A4C12HL56LV

Страница 1: ...AND UNDERSTOOD THOROUGHLY KOOLTRONIC INC 30 Pennington Hopewell Road Pennington NJ 08534 609 466 3400 FAX 609 466 1114 www kooltronic com 900 039 80 2 21 CDR 20308 HAZARDOUS LOCATION SERIES K3A4C12HL5...

Страница 2: ...oting 17 18 XII Warranty 19 NOTE Wiring Schematics are available on the specific model page of the Kooltronic website I Introduction Kooltronic Hazardous Location Air Conditioners HL Series are design...

Страница 3: ...nimum of 5 minutes 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...

Страница 4: ...ES WHEN INSTALLED ON AN APPROVED PRESSURIZED ENCLOSURE AND CONNECTED TO PURGE PRESSURIZATION CONTROL SYSTEM PER NFPA496 ALSO SUITABLE FOR CLASS I ZONE 2 GROUPS IIA IIB PLUS HYDROGEN AND IIC AIR LEAKAG...

Страница 5: ...of combustible materials or unless all devices within have been de energized WARNING HIGH TEMPERATURE INTERNAL PARTS This Air Conditioner must not be opened unless the area atmosphere is known to be...

Страница 6: ...pressurized customer enclosure must be connected to the Purge Pressurized Control System by gas air lines in parallel The Kooltronic HL Series Air Conditioner must be powered from the pressurized cust...

Страница 7: ...ter 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 rise...

Страница 8: ...the new set point value push the SET key again or wait 10 seconds HOW TO CHANGE A PARAMETER VALUE To change a parameter s value operate as follows 1 Enter the Programming mode by pressing the SET plu...

Страница 9: ...p code 7 0 65535 rEL Software release 0 rSE Real set point 0 onF on off key enabling ES PbC Kind of probe ntc Adr Serial address 1 1 247 HES Differential for energy saving 0 F 54 54 rrd Regulation res...

Страница 10: ...e ports The cool air discharged should be less than 70 F when the room temperature is between 70 F and 80 F 9 Reset the thermostat to the factory setting 75 F 10 Turn off the electrical power and disc...

Страница 11: ...to the enclosure The contact closure may be used with their control system having a timer function and output signal The output signal would energize a solenoid valve equipped with a fixed orifice or...

Страница 12: ...tion 1 It is recommended that a lift truck be used for installation 2 These externally mounted air conditioners utilize a gasket to ensure a proper seal This seal is necessary to maintain the integrit...

Страница 13: ...6 00 152 0 TYP 6 00 152 0 TYP 1 00 25 0 26 7 0 6 00 152 0 TYP 6 00 152 0 TYP 6 00 152 0 TYP 6 00 152 0 TYP 6 00 152 0 TYP 6 00 152 0 TYP 4 49 114 0 TYP 8 87 225 0 11 28 287 0 21 85 555 0 1 2 MOUNTING...

Страница 14: ...T POWER LOCATION 22 80 579 0 56 00 1422 0 14 91 378 8 61 15 0 12 70 323 0 7 41 188 0 INTERNAL FITTING 1 43 36 0 DETAIL VIEW A INTERNAL PURGE PRESSURE FITTING 1 4 NPT SEE DETAIL VIEW A EXTERNAL PURGE P...

Страница 15: ...IIC Hazardous Locations when used with an approved Type X Purge System on the electrical enclosure Meets NEC Class I Division 2 Groups A B C D and Class I Zone 2 Groups IIA IIB plus hydrogen and IIC...

Страница 16: ...ed under warm running water with clean side up If the accumulated dirt is oily washing in a detergent bath is recommended followed by a warm water wash as above After filter removal the exposed conden...

Страница 17: ...ent controller or enclosure see below Removing Air Conditioner from Pressurized Enclosure Conform to the applicable provisions of PROCEDURE FOR PROPER PACKING AND SHIPMENT OF KOOLTRONIC AIR CONDITIONE...

Страница 18: ...ondensate Eliminate the frequency of door openings draining and loss of A C sensible cooling performance Unit overcooling Failed Thermostat Check Thermostat wire connections Evaporator Blower Condense...

Страница 19: ...received 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...

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