Climate Control Electrical Enclosures

 

 

Cooling Products General Information

 

The Need for Environment Control
With wide spread use of micro-electronics in todays 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 10F or 5C
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 59F (15) or above 130F (52C).

 

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 m = 10.76 ft

Calculate the exposed surface area of the enclosure:

 


(Example for freestanding enclosure)

 

Step Three
 


 

1C or 1KΔT=1.8FΔT


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 ft]

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 125F (+52C). 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

 

Construction:

Outer shell of sheet steel.

Closed Loop Cooling:

Ambient   outside air is never mixed with clean dry enclosure air.

Operating Temperature

Minimum +46 F (+8 C) Maximum +125 F (52 C).  Optional low ambient kit is available

Gasket:

Is provided and/or installed on all units to maintain NEMA ratings specified.

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, 460 50/60Hz 3 phase.

Filter:

Removable filter mat made from synthetic fibers are reusable and can be rinsed clean.

Refrigerants:

All models use environmentally friendly R134a.

Fans:

All blower motors are thermal protected and sealed with permanent lubricants.

Condensate Disposal:

Built in condensate evaporators are standard on most models. 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

 

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

 

 

 

Side Mounting EID-DTS Series
1200 BTU/H

 

NEMA 12

 

 

Side Mounting EID-DTS Series
2000 BTU/H

 

NEMA 12

 

 

Side Mounting EID-DTS Series
2500 BTU/H

 

NEMA 12

 

 

Side Mounting EID-DTS Series
4000 & 7500 BTU/H

 

NEMA 12

 

 

Side Mounting EID-DTS Series
8000 & 12,000 BTU/H

 

NEMA 12

 

 

NEW High BTU Indoor Side Mount
 

NEMA 12

 

 

NEW High BTU Outdoor/Wash-down - Side Mount

 

NEMA 3R, 4

NEW High BTU Outdoor/Wash-down - Side Mount

 

NEMA 4, 4X

 

 

Side Mounting EID-DTS Series 16,000 BTU/H
 

NEMA 12

 

 

Top Mounting DTT Series 4500 BTU/H
 

NEMA 12

 

 

EID-Eclipse Series
 

Two Door Enclosures
 

NEMA 12

 

 

EID-1418 Series
 

Single Door Enclosures
 

NEMA 12, 13

 

 

EID-1418 N4 Series
 

Continuous Hinge with Clamped Cover
 

NEMA 4

 

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)

 

 

 

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:

 

 

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

 

 

 

 

Packaged Twin Blowers
 

160 to 470 CFM

 

 

NEW Filter- Fan PF 11000-22000 / Exhaust Filter PFA 10000-20000
 

Type 12

 

NEW Filter-Fan PF 32000 / Exhaust Filter PFA 30000
 

Type 12

 

 

NEW Filterfan PF 42500, PF 43000/ Exhaust Filter PFA 40000
 

Type 12

 

 

NEW Filterfan PF 65000, 66000, 67000/ Exhaust Filter PFA 60000


Type 12

 

 

NEW Industrial Filter Fan Accessories

 

 

PF Filter Fans

 

 

NEW Filter Fan Rain-Hoods (RH Series)
 

NEMA 3R

 

 

Filter Fan Boxes and Filter Grills

 

 

Fan Kits

 

 

EID-1422 MD Series
 

Multiple Door Enclosures
 

NEMA 12

 

 

EID-1422 MD Series
 

Multiple Door Enclosures
 

NEMA 12

 

Heating Products General Selection Considerations

 

Heating products protect electronic and electrical components from temperature problems that are below acceptable tolerances. There are obvious circumstances when extremely low ambient (outside cabinet) temperatures would require a heater, but there are also less apparent times that 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 are sensitive enough that both cooling and heating could be required 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. Hammond thermostats (one for heaters and one for cooling products) can control both systems automatically.

 

Heater Sizing Information

 

PH =

Total power required for this Application (W)

PV =

Existing power from components (W)

DT =

Temperature differential (Kelvin) ambient to cabinet interior (1 Kelvin = 1 C = 1.8 F)

A =

Free-standing cabinet surface area (ft)

k =

Heat transmission coefficient (W/ftK) convection in quiet air:

 

  • Painted Steel - approx. 0.51 W/ftK

  • Aluminum - approx. 1.115 W/ftK

  • Plastic - approx. 0.325 W/ft

  • Stainless Steel - approx. 0.344 W/ftK

 

Formula
 

PH = (DT x k x A) - PV
 

If enclosure located outside, use x 2 (DT x k x A)

 

Sample with Solution

 

DT =

5K

k =

Painted steel = 0.51 W/ftK

A =

50 ft

PV =

50W

PH =

(5 x 0.51 x 50) - 50

=

127.5 - 50

=

77.5W

 

Recommend: EID-SHP045039, 80W Heater

 

 

 

Heaters

 

 

Fan Heaters

 

 

Control Panel Heater

 

 

High Wattage Heater

 

 

Fan Heater with Thermostat

 

 

Thermostat

 

 

Mechanical Humidistat

 

 

Electronic Humidity and Temperature Control

 

 

Breather Kits

 

 

NEW Rainproof Ventilators