Cooling Products 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.

 

General Selection Considerations

 

Cooling

 

Conditions	Solution	Advantages	Disadvantages
Maximum desired enclosure temperature is 10°F or 5°C 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 maintenance, 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 than 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, small power consumption, temperature control via thermostat. Maintains NEMA rating of the enclosure.	Must maintain filters.
Maximum desired enclosure temperature lower than maximum outside ambient.	Use an air conditioner	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. Generally not to be used when outside temperature is below 59°F (15°) or above 130°F (52°C).

 

Circulation

 

Conditions	Solution	Advantages	Disadvantages
Localized heat or "hot spots".	Install circulation fans in the enclosure.	Economical solution, no maintenance, easy to install. Maintains NEMA rating of the enclosure.	Dissipates small amount of heat.

 

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 dew-point.	Economical power consumption. Reliable, humidity can be controlled.	Consumes energy, takes up internal panel space.

 

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 One     1 Watt = 3.413 BTU/H Determine the internal heat load (in Watts) that must be dissipated.

Step Two     1 m² = 10.76 ft² Calculate the exposed surface area of the enclosure:   2(h" x w") + 2(h" x d") + (w" x d") = Area (ft²) 144 (Example for freestanding enclosure)

Step Three     1°C or 1°KΔT=1.8°FΔT Determine the temperature differential by subtracting the maximum allowable temperature inside the enclosure (Ti) from the maximum ambient temperature outside the enclosure (To).   To-Ti = DT

 

Step Four   (Watts x 3.413) + [1.25 x Area ft²] X DT (°F)] = BTU/H Capacity Required BTU/H. Capacity Rating

 

The EID-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 top 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.

 

General Specifications for All Air Conditioners

 

 

Product Summary

 

Side Mount Air Conditioners

 

Part No.	NEMA Protection	Rating BTU/H	Rated  Voltage	Hz	Height	Width	Depth
EID-DTS1200A115LG	12	1,200	115	60	13	14.76	7.48
EID-DTS1200A230LG	12	1,200	230	50/60	13	14.76	7.48
EID-DTS2000A115LG	12	2,000	115	60	17.52	12.4	10.04
EID-DTS2000A230LG	12	2,000	230	50/60	17.52	12.4	10.04
EID-DTS3081A115N4SS	4X	2,500	115	60	20.15	10.05	10.77
EID-DTS3081A230N4SS	4X	2,500	115	60	20.15	10.05	10.77
EID-DTS3041A115LG	12	2,500	115	60	20.15	10.05	10.77
EID-DTS3041A230LG	12	2,500	230	50/60	20.15	10.05	10.77
EID-DTS3141A115LG	12	4,000	115	60	29.46	15.55	9.38
EID-DTS3161A115N3LG	3R/4	4,000	115	60	29.46	15.55	9.32
EID-DTS3141A230LG	12	4,000	230	50/60	29.46	15.55	9.38
EID-DTS3181A115N4SS	4X	4,000	115	60	29.46	15.55	9.32
EID-DTS3161A230N3LG	3R/4	4,000	230	50/60	29.46	15.55	9.32
EID-DTS3181A230N4SS	4X	4,000	230	50/60	29.46	15.55	9.32
EID-DTS3241A115LG	12	7,500	115	60	47.61	15.55	10.65
EID-DTS3261A115N3LG	3R/4	7,500	115	60	47.61	15.55	10.51
EID-DTS3281A115N4SS	4X	7,500	115	60	47.61	15.55	10.51
EID-DTS3241A230LG	12	7,500	230	50/60	47.61	15.55	10.65
EID-DTS3261A230N3LG	3R/4	7,500	230	50/60	47.61	15.55	10.51
EID-DTS3281A230N4SS	4X	7,500	230	50/60	47.61	15.55	10.51
EID-DTS8000A115LG	12	8,000	115	60	53.15	15.63	10.63
EID-DTS8000A230LG	12	8,000	230	50/60	53.15	15.63	10.63
EID-DTS12000A115LG	12	12,000	115	60	53.15	15.63	10.63
EID-DTS12000A230LG	12	12,000	230	50/60	53.15	15.63	10.63
EID-DTS9841A460LG	12	16,000	460	60	60.98	19.09	14.17

 

Top Mount Air Conditioners

 

Part No.	NEMA Protection	Rating BTU/H	Rated  Voltage	Hz	Height	Width	Depth
EID-DTT4500A115LG	12	4,500	115	60	15.94	23.62	15.35
EID-DTT4500A230LG	12	4,500	230	50/60	15.94	23.62	15.35

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blowers and Fans General Selection Considerations

 

General Specifications

 

All Hammond blowers and filters are engineered for performance and built for reliability. This versatile line includes a blower, fan tray and filter fans.

Blowers and fans use forced convection cooling, which means ambient air flows through a filter into the enclosure to cool heated components. Both blowers and fans are sized in CFM (cubic feet per minute).

It is recommended that an exhaust filter be used in combination with the blower or filter fan to act both as an exhaust point for the hot internal air plus aid in the pressurization of the enclosure, reducing the chance of unfiltered air entering the enclosure. Whenever possible, the blower or filter fan should be located in the bottom third of the enclosure and the filtered exhaust grill placed as high as possible on the opposing side. Performance levels can be further increased by adding a second exhaust filter.

Sizing Blowers and Fans

 

To determine the CFM (cubic feet per minute) required in any standard situation, use the following calculation, (non-standard situations would consist of high air density - significantly more then 0.075 lbs per cubic feet)

 

 

CFM =	Power to be dissipated (Watts) x 3.17
	Maximum allowable internal Temperature (°F) - Maximum Ambient Temperature ( °F)

 

Note: The calculation above is exact, but adding an additional 25% to the CFM level is a standard safety factor.

If the air density is high (significantly more then 0.075 lbs per cubic foot), use the number calculated above in the following formula:

 

CFM x (0.075)

Non-Standard Air Density (lbs per cubic foot)

 

Note: Ambient Temperature must be lower than maximum internal temperature for fan/blower to be effective.