Model HT4740 NEMA 4 2,800 Btu/hr HT Cabinet Cooler, Cont Oper

Applications

• Programmable controllers
• Line control cabinets
• Motor control centers
• Relay panels
• NC/CNC systems
• Modular control centers
• CCTV cameras
• Computer cabinets
• Cool laser housings
• Electronic scales

NEMA 4 Cabinet Cooler Advantages

• Low cost
• Compact
• Cooling capacities up to 5,600 Btu/hr. (1,641 Watts)
• Quiet
• Install in minutes
• Maintain NEMA 4 integrity (IP66)
• Stabilize enclosure temperature and humidity
• No CFC's
• No moving parts - maintenance free
• Mount in standard electrical knockout
• Stop nuisance tripping
• Stop heat damage
• Eliminate fans and filters
• Eliminate lost production
• Stop circuit drift
• Stop dirt contamination
• Provide washdown protection

Side Mount Kits

EXAIR's Side Mount Kits make mounting on the side of an electrical enclosure possible when there is limited space on the top or side. (NEMA 4 and 4X Cabinet Cooler Systems must be mounted vertically.) Side Mount Kits maintain the NEMA rating of large and small NEMA Type 12, 4, and 4X enclosures. they mount in a standard electrical knockout (1-1/2 NPS). Side Mount Kits for NEMA 12 Cabinet Cooler Systems have an aluminum construction. Those for NEMA 4 and 4X Cabinet Cooler Systems are Type 303 or Type 316 stainless steel.

What is an EXAIR Cabinet Cooler System?

EXAIR Cabinet Coolers are a low cost, reliable way to cool and purge electronic control panels. They provide air conditioning for the electrical enclosures, eliminating electronic control downtime due to heat, dirt and moisture! These panel cooling systems for enclosures incorporate a vortex tube to produce cold air from compressed air - with no moving parts.

The compact Cabinet Cooler is an easy to use air conditioner that can be installed in minutes through a standard electrical knockout. NEMA 12, 4 and 4X Cabinet Coolers that match the NEMA rating of the enclosure are available in many cooling capacities for large and small control panels.

Why EXAIR Cabinet Coolers?

When the electronics inside a control cabinet overheat, the machine can shut down due to tripped overloads and breakers or heat damage to the circuit boards. Unreliable cooling methods such as fans, heat exchangers, refrigerant air conditioners, and heat pipes are prone to failure as a result of mechanical wear, and clogged filters.

EXAIR Cabinet Coolers provide cold air for large and small control panels and are maintenance free. They have no moving parts to wear out. All Cabinet Coolers are UL, ULC Listed and/or CE compliant and have a five year “Built To Last” warranty.

Heat Can Stop Your Machines

It happens when you least expect it. High temperatures can cook the electronics that control your machines, resulting in erroneous readings, trip-outs or fried circuit boards. Cooling the electrical cabinet can eliminate these problems, but how will you do it?

Fans

Opening the panel door and aiming a fan at the circuit boards is a bad idea.

• It is an OSHA violation that presents a shock hazard to personnel
• The fan blows hot, humid, dirty air at the electronics
• The cooling effect is minimal
• It is likely to fail again since the environment is still hot

Heat Exchangers and Heat Pipes

These have serious limitations. On hot summer days when the temperatures of the room and inside the enclosure are about equal, there’s not enough difference for effective heat exchange.

• They fail when dust and dirt clog the filter
• The cooling capacity is limited due to ambient conditions

Refrigerant Panel Air Conditioners

These coolers are prone to failure in dirty, industrial environments when dust and dirt clogs the filter.

• It takes almost a day to install
• Vibration from machinery causes refrigerant leaks and component failures
• Compressor life expectancy is typically 2.5 years of continuous operation
• It requires a floor drain for the condensation
• Thermostat control can decrease compressor life
• Average cost for replacing a bad compressor is $750

EXAIR Cabinet Cooler Systems

EXAIR has a complete line of Cabinet Cooler Systems to dependably cool and purge your electrical enclosures. They convert an ordinary supply of compressed air into clean, cold 16ºF (-9°C) air. They mount in minutes through an ordinary electrical knockout and have no moving parts to wear out. Compressed air filtration is provided that keeps water, oil and other contaminants out of the enclosure.

• There is no room air filter to clog
• An accurate electrical thermostat control minimizes compressed air use
• All Cabinet Coolers are UL Listed to US and Canadian safety standards
• They are the only compressed air powered coolers that are CE compliant

NEMA 4 Cabinet Coolers

NEMA 4 (IP66) Cabinet Cooler systems are dust and oil tight, splash resistant and indoor/outdoor capable. By incorporating a low pressure valve for all air exhaust, the valve closes and seals when not operating to maintain NEMA 4 enclosure integrity. They are constructed of aluminum with a 303 stainless steel vortex tube.

Thermostat control systems (Models 4804-4880) are the most efficient system because it will turn itself on and off as needed to cool your enclosure. Includes cooler, solenoid valve and thermostat, filter separator and cold air distribution kit. Models are available in 110VAC, 240VAC and 24VDC.

Continuous operation systems (Models 4704-4780) include the cooler, a filter separator and cold air distribution kit.

ETC Thermostat control systems provide on the fly temperature adjustment and an internal temperature feedback display.

High Temperature Cabinet Cooler systems should be used when ambient temperatures reach 125°F to 200°F (52°C to 93°C).

Non-Hazardous Purge (NHP) models provide a continuous positive purge within the enclosure to prevent contaminants from entering. They are suited for extremely dirty and dusty environments.

Dual Cabinet Cooler systems (Models (##50-##80) provide for additional cooling.

Other Considerations

Systems for continuous operation include a Cabinet Cooler, cold air distribution kit and filter.

Systems with thermostat control include a Cabinet Cooler, thermostat, solenoid valve, cold air distribution kit and filter.

Filtration:

EXAlR Cabinet Cooler Systems include a 5 micron automatic drain water and dirt filter. This filter is critical for protection of electronics from water and dirt in the compressed air line. If oil is present in the compressed air supply, the addition of a coalescing (oil removal) filter, such as EXAlR Model 9005, is recommended.

Cold Air Distribution Kit includes tubing, adhesive clips and fittings.

Cold Air Distribution Kit:

The kit includes a length of flexible vinyl tubing used to direct the cold air for circulation, or to hot spots. Tubing connectors and adhesive backed clips to hold the tubing in place are provided.

Humidity:

For a continuous operating Cabinet Cooler, relative humidity inside the enclosure stabilizes at 45%. No moisture condenses inside the enclosure. (The enclosure must be sealed to prevent condensation.)

Inlet Air Temperature:

Cabinet Cooler Systems provide a 54°F (30°C) temperature drop from supply air temperature when the inlet pressure is 100 PSIG (6.9 BAR). Elevated inlet temperature will produce a corresponding rise in cold air temperature and reduction in cooling capacity. Low air pressures will also reduce the cooling capacity.

Mounting:

The Cabinet Cooler mounts to the enclosure through a drilled hole or electrical knockout. The NEMA 12 (IP54) Cabinet Coolers may be mounted on the top or side of the panel. NEMA 12 Side Mount Kits are available - Model 4909 - Small; Model 4910 - Large. NEMA 4 and 4X (IP66) Cabinet Coolers may be mounted on the top of the panel or on the side of the panel if a Side Mount Kit is used - Model 4906 - Small; Model 4907 - Large.

Solenoid Valve and Thermostat

Solenoid Valve and Thermostat:

Cabinet Cooler Systems with thermostat control include a solenoid valve and thermostat that limit the flow of compressed air to only when cooling is needed. The thermostat is factory set at 95°F (35°C). It will normally hold ±2°F (1°C) inside the cabinet. Solenoid valves are available in 120V, 60Hz; 110V, 50Hz; 240V, 50/60Hz and 24VDC. All solenoids are CSA Certified and UL Listed or Recognized.

ETC units are available in four different models.

Electronic Temperature Control:

EXAIR’s digital ETC™ (Electronic Temperature Control) provides precise temperature control for your electrical enclosure. It can accurately maintain a constant temperature that is slightly under the maximum rating of the electronics, permitting just enough cooling for the electronics without going so cold as to waste compressed air.

The LED readout of the ETC displays the internal temperature of the electrical enclosure (°F or °C) that is constantly being monitored by a quick response thermocouple. The control activates the solenoid valve (included) when the temperature setting is exceeded. The polycarbonate plastic enclosure of the ETC is suitable for NEMA 12, 4 and 4X environments. (Cabinet Cooler not included.)

ETC controls are available within Cabinet Cooler Systems or separately for retrofitting on existing coolers. ETCs are RoHS and CE compliant.

Selecting The Right Cabinet Cooler® System

A dangerous shock hazard exists when the panel door is opened to let a fan blow hot, dirty shop air at the electronics.

With or Without Thermostat Control

EXAIR Cabinet Coolers are available with or without thermostat control. The continuous coolers (Model 4200 and 4700 series) are recommended when constant cooling and a constant positive purge are desirable. The thermostatically controlled systems (Model 4300 and 4800 series) save air by activating the cooler only when internal temperatures approach critical levels. The adjustable thermostat is factory set at 95°F (35°C). Thermostatic systems are recommended where heat load fluctuates and continual purge is not required.

All EXAIR Cabinet Cooler Systems contain a 5 micron Automatic Drain Filter for the compressed air supply and a Cold Air Distribution Kit to circulate the cold air throughout the enclosure.

Cabinet Cooler® Sizing Guide!

Use our Cabinet Cooler Sizing Guide to submit information online about your control panel cooling problem.

For immediate help, call our Application Engineering Department at 1-800-903-9247.

Cabinet Cooler Standards and Certifications

EXAIR's Cabinet Cooler Systems comply with OSHA's Safety Requirements, the EU General Product Safety Directive (2001/95/EC) and meet the noise limitation requirements of the EU Machinery Directive (2006/42/EC). In addition, Cabinet Cooler Systems are Listed to applicable UL Standards and requirements by Underwriters' Laboratories. All sound level measurements are taken at 3 feet away.

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Special Cabinet Coolers

EXAIR manufactures special NEMA 12 (IP54), 4 (IP66) and 4X (IP66) Cabinet Coolers suited to specific environmental requirements, as well as Side Mount Kits for mounting Cabinet Coolers on the side of enclosures. EXAIR Dual Cabinet Cooler Systems, High Temperature Cabinet Coolers, Non-Hazardous Purge Cabinet Coolers and Type 316 Cabinet Coolers are now available from stock.

Dual Cabinet Cooler Systems are available in NEMA 12, 4, and 4X models.

EXAIR's Dual Cabinet Cooler Systems (shown left) are ideal for large electrical enclosures and high heat loads. Dual Cabinet Coolers are available with cooling capacities of 3,400 (997 Watts), 4,000 (1,171 Watts), 4,800 (1,406 Watts) and 5,600 Btu/hr. (1,641 Watts). For more information, contact an Application Engineer.

High Temperature Cabinet Coolers for ambients up to 200°F (93°C) are available.

High Temperature Cabinet Cooler Systems for ambients of 125° to 200°F (52° to 93°C) are available (shown right). Internal components can withstand high temperatures (like those near furnaces, ovens, etc.) High Temperature Dual Cabinet Cooler Systems are also available.

The continuous purge of the NHP Cabinet Cooler System keeps dirt, heat and moisture out of the enclosure.

Non-Hazardous Purge Cabinet Cooler Systems (shown left) are ideal for dirty areas where contaminants might normally pass through small holes or conduits. Under normal conditions, the NHP Cabinet Cooler System provides a slight positive pressure in the enclosure by passing 1 SCFM (28 SLPM) of air through the cooler, when the solenoid valve is in the closed position. When the thermostat detects high temperature, it energizes the solenoid valve to pass full line pressure to the Cabinet Cooler, giving it full cooling capability. The continuous purge of the NHP Cabinet Cooler System keeps dirt, heat and moisture out of the enclosure.

316SS Cabinet Coolers use Type 316 stainless steel which is more resistant to corrosive conditions than other stainless steels.

Type 316 Stainless Steel NEMA 4X Cabinet Cooler Systems (shown right) are suitable for food service, pharmaceutical, harsh and corrosive environments, and other applications where 316SS is preferred. Capacities from 650 to 5,600 Btu/hr. (191 to 1,641 Watts) are available.

EXAIR Dual Cabinet Coolers, High Temperature Cabinet Coolers, Non-Hazardous Purge Cabinet Coolers and Type 316 Cabinet Coolers are available from stock.