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11

Customer Enclosure Requirements (con’t)

Pressure Compensation

CAUTION 

When an air conditioner is used on a sealed, pressurized enclosure the temperature inside the enclosure may
change rapidly when the air conditioner starts and when the compressor cycles. These conditions may cause the
enclosure pressure to decrease for a period of time below the required pressure. This can trip safety systems
associated with the purge/pressurization control equipment. 

It is recommended that the control equipment be

selected and sized to compensate for this potential condition

.  It is the user’s responsibility to make careful

adjustment to the pressure interlocks and flow adjustments to the purge system.

Should the purge/pressurization control equipment fail to compensate for the drop in pressure, a recommended safety
measure is to provide an additional amount of pressurized air to the enclosure independent of the purge/pressurization
control equipment (see drawing on page 12). 

The Kooltronic air conditioner is equipped with an external terminal block marked “Pressure Compensation,” which is
connected to a relay inside the air conditioner. When the air conditioner compressor starts, the relay’s contacts are
closed. 

Users of the air conditioner can utilize these contacts with their controls to add additional pressurized air 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 an adjustable needle valve within the
enclosure. This would provide additional pressurized air for a selected period of time (typically two to three minutes).
The relief valve utilized on the purge/pressurization control equipment must be capable of handling the capacity of
the solenoid valve in a failure mode. The timer function allows pressurized air to be added during the time the
temperature is ramping down within the enclosure, maintaining the proper pressure. Once temperature stability is
achieved and the air conditioner is running constantly, the internal pressure will be controlled by the
purge/pressurization control equipment. Subsequently, the solenoid valve is energized on each compressor start. The
installation should be tested to determine enclosure pressures, safety interlock settings, system operation and the
time interval that the solenoid air valve is open.

DISCLAIMER 

This information is provided as a general guide, and is not intended to be instructional. Kooltronic makes no claims,
promises or guarantees about the accuracy, completeness or adequacy of this information. Any action taken based
upon this information is strictly at your own risk. 

Kooltronic accepts no liability for the content of this information, or for the consequences of any actions taken on the
basis of the information provided.  

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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