| Cooling Products General Information |
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<< Industrial Enclosures << |
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General Information
The Need for Environment Control
With wide spread use of micro-electronics in today’s control systems, temperature management takes on a new priority in order to ensure steady and reliable performance. The maintenance of a correct operating temperature may combine both cooling and or heating inside an enclosure which can protect against costly down time and system failures.
The Purpose of Cooling
Electrical/electronic control systems together generate heat as a by-product of their operation. When equipment is located in areas where clean dry air for ventilation is either not available or high external temperatures exist, active methods such as air conditioning must be applied.The Purpose of Heating
Heaters protect electronic and electrical components from temperature problems that are below tolerances. Obviously, there are circumstances when extremely low ambient (outside cabinet) temperatures would require a heater, but there are also less apparent times when a heater should be considered. For example, a system may run all day having its components generate heat, but once the system shuts down for the night, the quick drop in temperature could cause condensation and possibly corrosion - a heater could maintain a safe, constant temperature.
Combined Cooling and Heating
Some components today require both cooling and heating in the same enclosure. When designing your system, be aware of the need to maintain a relatively constant temperature inside the enclosure as ambient temperatures swing from cool to very hot.
Information Needed for Environment Control Selection
The following information should be on hand to properly size cooling products:
- Heat to be dissipated (Watts).
- Maximum temperature expected outside enclosure (°F) or (°C).
- Maximum allowable internal enclosure temperature (°F) or (°C).
- Surface area of enclosure (ft2) or (m2).
The following information should be on hand to properly size heating products:
- Heat being generated by electrical/electronic components (in Watts)
- Minimum temperature expected outside enclosure (°F) or (°C).
- Minimum allowable internal enclosure temperature (°F) or (°C).
- Surface area of enclosure (ft2) or (m2).
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| General Selection Considerations |
| Cooling |
| Conditions |
Solution |
Advantages |
Disadvantages |
| Maximum desired enclosure temperature is 10oF or 5oC above maximum outside ambient |
Oversize the Enclosure |
Easy to implement, no maintenance. Maintains NEMA rating of the enclosure |
Dissipates small amount of heat. Larger enclosure size takes up more space. |
| Install ventilation louvers |
Economical solution, very little maintaince, easy to implement |
Dissipates limited amount of heat. Dirt, oil or fluids could enter the enclosure. NEMA rating is affected. |
| Install filter fans |
Less expensive then air/refrigeration systems. Relatively high amount of heat removed, some temperature control by using thermostats |
Must maintain filters. NEMA rating can be affected. Limited use in hostile environments such as chemical Applications. |
| Use an air/air heat exchanger |
Easy to install. Temperature control via factory installed thermostat. Removes large amounts of heat. Maintains NEMA rating of enclosure, dehumidifies enclosure air. |
Must maintain filter. Cannot be used when outside temperature is below 59o°F(15°C) or above 130°F(52°C). |
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| Circulation |
| Conditions |
Solution |
Advantages |
Disadvantages |
| Localized heat or "hot spots". |
Install circulation fans in the enclosure. |
Economical solution, no maintainance, easy to install. Maintains NEMA rating of the enclosure. |
Dissipates small amount of heat. |
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| Heating |
| Conditions |
Solution |
Advantages |
Disadvantages |
| Outside temperature is below minimum allowable equipment operation range. |
Heat with radiant heater. |
Economical power consumption. Reliable, can be temperature controlled. |
Consumes energy, takes up internal panel space. |
| Condensation occurs. |
Heat with radiant heater to maintain temperature above the dewpoint. |
Economical power consumption. Reliable, humidity can be controlled. |
Consumes energy, takes up internal panel space. |
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| Air Conditioner Design Features |
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Side Mounting & Q Mount
Q Mount allows installation of the air conditioner to be performed by a single person, saving valuable time and money. Thread-in-Studs hold the unit in place while it is fastened to the enclosure. This also allows for the air conditioner to be easily removed for safe transportation separate from control equipment. |
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Recessed Mounting
The optional recessed moutning frame will reduce the external enclosure dimensions. |
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Top Mounting
Lifting top mount units into place can be safely accommodated with optional lifting lugs which attach to the frame assembly. |
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One Template Mounting
One single template accommodates cooling ranges from 6,000 BTU/H to 12,000 BTU/H. This allows size upgrades without making modifications to the existing cutouts. The additional height of these units, combined with their integrated air ducting ensures maximum air circulation within the enclosure, reducing the chance of heat pockets. Small capacity units, 1,200 BTU/H and 2,000 BTU/H are retrofitable to leading North American cutouts allowing for easy upgrading or replacement. |
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Serviceability
Improved serviceability begins with the unique PF filter grill. This grill provides superior protection of the filter mat compared to units with a metal mat and is easily removed for cleaning. Quarter turn screws allow the external cover of the air conditioner to be completely removed for ease of inspection and serviceability. |
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Sizing an Air Conditioner
The proper selection of an air conditioner is determined by the following steps:
Step 1 - Internal heat load quoted as Watts that must be dissipated.
Step 2 - The exposed surface area of the enclosure.
Step 3 - Temperature differential required between maximum inside temperature and maximum outside ambient.
Step 4 - Final calculation of the above. |
| Step 1 |
Step 2 |
Step 3 |
Step 4 |
1 Watt = 3.413 BTU/HDetermine the internal heat load (in Watts) that
must be dissipated. |
1 m² = 10.76 ft²Calculate the exposed surface area of the enclosure:[2(h"xw") + 2(h"xd") + (w"xd")]/144=Area (ft²)(Example for freestanding enclosure) |
1°C or 1°KAT=1.8°FATDetermine the temperature differential by subtracting the maximum allowable termperature inside the enclosure (T¹) from the maximum ambient temperature outside the enclosure (T°).T°-T¹ = DT |
(Watts x 3.413) + [1.25 x Area ft² x Dt(°F)]=BTU/H < size="1">(Capacity required BTU/H. Capacity Rating) |
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| General Specifications for All Air Conditioners |
The DTS/DTT offering is available in the most popular selection of cooling capacities, sizes, voltages and mounting configurations. Available capacities range form 1,200 to 12,00 BTU/H in both side mounting an dtop mounting models. All models use powerful radial fans for maximum air circulation inside the enclosure in ambient temperature of 125°F (+52°C). Models from 2,000 BTU/H capacity are equipped with thermal expansion valves for optimal use of the evaporator heat exchange surface under all operating conditions. For additional protection of the compressor motor, these valves are supplied as standard with Maximum Operating Pressure control devices (MOP). For energy conservation, the use of hot gas bypass valves is limited to the unload starting and control of large compressors from 8,000 BTU/H upwards.
All air conditioners were developed, designed and subject to final inspections in accordance with international Standards. |
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Construction
Outer shell of sheet steel. |
Finish
Durable electrostatic powder coat in RAL7032 beige. Contact Hammond for special color quotations. |
Closed Loop Cooling
Maintains NEMA 12/IP 54 rating of the enclosure. Ambient outside air is never mixed with clean dry enclosure air. |
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Gasketing
Is provided and/or installed on all units to maintain NEMA 12/IP 54 ratings. |
Templates
Provided on all units for easy layout of cutouts and mounting. |
Power
Available in 115 V 60 Hz, 110 V 50 Hz and 230 V 50/60Hz. |
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Cord
Included on all units - 3 wire type SJT 1813 AWG, 115 V 60 Hz units below 14 amps are terminated with a plug. |
Filter
Removable filter mat made from synthetic fibers are reusable and can be rinsed clean. |
Refrigerants
All models use environmentally friendly R134a. |
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Fans
All blower motors are thermal protected and sealed with permanent lubricants. |
Condensate Disposal
Built in condensate evaporators are standard on all but the 1200 BTU model. All units feature a condensate drain fitting complete with hose attachment. |
Insulation
Cold components, lines and evaporator compartment insulated for maximum efficiency and protection against condensation. |
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Quality Assurance
Prior to charging, the refrigeration system is hermetically sealed with all joints brazed under protection gas atmosphere to exclude any internal scale. After a thorough leak test every unit undergoes safety and function checks, then is serialized and packed into sturdy boxes prior to shipment. |
Installation Manuals
Included with all models are detail drawings, mounting, schematic and wiring diagrams, a trouble shooting checklist and warranty information. |
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| Product Summary |
| Side Mount Air Conditioners |
| Part No. |
Rating BTU/H |
Rated Voltage |
Hz |
Height |
Width |
Depth |
| DTS1200A115 |
1,200 |
115 |
60 |
13.00 |
14.76 |
7.48 |
| DTS1200A230 |
1,200 |
230 |
50/60 |
13.00 |
14.76 |
7.48 |
| DTS2000A115 |
2,000 |
115 |
60 |
17.52 |
12.40 |
10.04 |
| DTS2000A230 |
2,000 |
230 |
50/60 |
17.52 |
12.40 |
10.04 |
| DTS3500A115 |
3,500 |
115 |
60 |
36.00 |
15.35 |
7.87 |
| DTS3500A230 |
3,500 |
230 |
50/60 |
36.00 |
15.35 |
7.87 |
| DTS6000A115 |
6,000 |
115 |
60 |
53.15 |
15.35 |
7.87 |
| DTS6000A230 |
6,000 |
230 |
50/60 |
53.15 |
15.35 |
7.87 |
| DTS8000A115 |
8,000 |
115 |
60 |
53.15 |
15.63 |
10.63 |
| DTS8000A230 |
8,000 |
230 |
50/60 |
53.15 |
15.63 |
10.63 |
| DTS12000A115 |
12,000 |
115 |
60 |
53.15 |
15.63 |
10.63 |
| DTS12000A230 |
12,000 |
230 |
50/60 |
53.15 |
15.63 |
10.63 |
| DTS2000A115N4SS |
2,000 |
115 |
60 |
19.04 |
16.09 |
15.08 |
| DTS2000A230N4SS |
2,000 |
230 |
60 |
19.04 |
16.09 |
15.08 |
A115 units can be operated 50 Hz at 110V |
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| Top Mount Air Conditioners |
| Part No. |
Rating BTU/H |
Rated Voltage |
Hz |
Height |
Width |
Depth |
| DTT4500A115 |
4,500 |
115 |
60 |
15.94 |
23.62 |
15.35 |
| DTT4500A230 |
4,500 |
230 |
50/60 |
15.94 |
23.62 |
15.35 |
A115 units can be operated 50 Hz at 110V |
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