TECA Corp.
4048 W. Schubert
Chicago, IL 60639
T: (773) 342-4900
T: (888) 832-2872
F: (773) 342-0191
Design Considerations
 
  • NEMA/IP
  • IP Ratings
  • NEMA-IP Comparison

NEMA Ratings:

NEMA-12: Type 12 enclosures are intended for indoor use primarily to provide a degree of protection against dust, falling dirt, and dripping non-corrosive liquids. Applies to AHP & FHP models.

Source: NEMA Publication N0. 250, Part 1, Page 1

NEMA-4X: Type 4X enclosures are intended for indoor and outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, and hose directed water TECA products carrying the "X" designation use Mil-Spec fans, o-ring sealed power supplies, no exposed electronic components, stud/gasket mounting and Mil-Spec finishes. Products with the "XE" designation use sealed fans, sealed components, stud/gasket mounting and Mil- Spec finishes. They are designed to maintain the enclosure rating and perform in the rated environment. Applies to AHP-X / XE & FHP-XE models.

Source: NEMA Publication N0. 250, Part 1, Page 1

The IP (Ingress Protection) standard describes a uniform system for classifying the degrees of protection provided by the enclosures of electrical equipment. The first number refers to the level of protection against penetration of solid objects into the enclosure. The second number refers to the level of protection against penetration of liquids into the enclosure.

Number Level of protection Number Level of Protection
0 No protection 0 No protection
1 Protection against objects over 50mm, accidental touch by hands 1 Protection against vertically dripping water
2 Protection against objects over 12mm, protection against touch by fingers 2 Protection against liquid drops at 15° from vertical
3 Protection against objects over 2.5mm, tools, wires, etc. 3 Protection against rain at angle of up to 60° from vertical
4 Protection against objects over 1mm, small tools, wires, etc. 4 Protection against splash from any direction
5 Complete protection against contact. Protection against harmful ingress and deposit of dust 5 Protection against water jets from any direction
6 Complete protection against contact. Protection against ingress of dust 6 Protection against heavy sea water
    7 Protection against immersion in water under stated conditions of pressure and time
    8 Protection under indefinite immersion in water under specified pressure
Source: Hoffman® standards, page A.05

NEMA & IP Ratings Comparison:

NEMA Rating IP Rating
1 10
2 11
3 54
4 56
4X 66
6 67
12 52
13 54

Note: The comparison chart above is only an approximation

 
  • Military Standards

Military Standards (Mil-Std 810):

Corrosion: (Salt Fog Testing) Method 509.2,168 Hours. Applies to AHP-X models.
Vibration: Method 514.3, 2 hours, x,y,z axis 8.9 G’s. 10-2000 Hz with a magnitude of 0.04 G²/Hz.
Applies to XM (consult factory) models.

Vibration: Method 514.3, 2 hours, x,y,z axis 8.9 G’s. 10-2000 Hz with a magnitude of 0.04 G²/Hz. Applies to XM (consult factory) models.

Shock: Method 516.2, with 30 G’s peak amplitude, 11ms pulse duration, half-sine waveform, and three (3) shocks in each direction along three (3) mutually orthogonal axes. Employed for all XM versions. Standard models are designed to withstand 2.2 G’s.
Applies to AHP-X models.

Source: Mil-Std 810

 
  • NEC

NEC - National Electrical Code:

CID2 Class I, Division 2 (Hazardous Environments) – a location (1) in which volatile flammable liquids or flammable gases are handled, processed, or used, but in which the liquids, vapors, or gases will normally confined within closed containers or closed systems from which they can escape only case of accidental rupture or breakdown such containers or systems, or in case of abnormal operation of equipment; which ignitable concentrations of vapors are normally prevented by mechanical ventilation, and which become hazardous through failure operation of the ventilating equipment; that is adjacent to a Class I, Division location, and to which ignitable concentrations gases or vapors might occasionally communicated unless such communication prevented by adequate positive-pressure ventilation from a source of clean air, safeguards against ventilation failure pro-vided.
Applies to AHP-XP models.

Groups (A-D) Atmospheres containing following: acetylene, hydrogen, fuel, combustible process gases containing 30% hydrogen by volume, or gases of equivalent hazard such as butadiene, ethylene oxide, propylene oxide, acrolein, ether, ethylene, or gases or vapors equivalent hazard such as acetone, ammonia, benzene, butane cyclopropoane, gasoline, hexane, methanol, methane, naphtha, propane, or gases or vapors equivalent hazard.
Applies to AHP-XP models.

Source: NEC 2005, Article 500

 
 
  • UL/CSA
  • CE

UL/CSA:

UL- 1604: Hazardous duty operation, Class I and II Division 2, Class III Div 1 and 2. Tested thru ETL and ETLc Testing Laboratories, Report #551722.
Applies to AHP-XP models

UL-1995 & CSA 22.2: Heating and Cooling Equipment, Categories 169 & 294, No. 236- M90. Tested thru ETL and ETLc Testing Laboratories, Report #532015.
Applies to AHP, AHP-XE, FHP, FHP-XE models.

UL-3101-1 & CSA 22.2: Electrical equipment for laboratory use. Safety requirements for electrical equipment for measurement, controls and laboratory use. Tested thru ETL and ETLc Testing Laboratories, Report #20022721.001.
Applies to TLC-700, TLC-702 liquid chiller models.

CE

EN 60335-1 & EN60335-2-40: Safety of household & similar electrical appliances, part 1: General requirements.Part 2: Particular requirements for electrical heat pumps, air conditioners & dehumidifiers (IEC 335-2-40: 1992, Modified).
Low voltage directive 73/23/EEC - European Union (EU)
EMC directive 89/336/EEC – European Union (EU)
Tested thru ETL.
Applies to AHP, AHP-XE, FHP, FHP-XE models.

EN 61326, EN 61010-1 & EN 61010-2: Application of council directive: Machinery directive (89/336/EEC)
Standard EN 61326:1997, Class A; EN 61326:1997, Industrial location
Low voltage directive 73/23/EEC – European Union (EU)
Standard EN 61010-1-A1:97; EN 61010-2-010-A1:97
Tested thru ETL.
Applies to TLC-700, TLC-702 liquid chiller models.

 
  • Condensation

Mounting:

TECA’s FHP thermoelectric air conditioners are designed to mount on the outside of the enclosure. There is no intrusion within the enclosure allowing for greater design flexibility. A mounting plate provides for easy installation.

Side, Front, or Back Mounting: This mounting orientation is recommended for applications with high humidity or incomplete cabinet seals. Condensation can be removed via moisture collection systems (standard on FHP-units and AHP-1400) or a drip pan positioned below the cold side fins. Drip pans are optional for thru mount style units.

Top Mounting: It is difficult to collect condensation in this orientation due to fin orientation and gravity. If a drip pan is employed by the end user, use caution to place the pan far enough away from the internal fan to minimize the restriction of air flow. The pan should cover the fin ends as well as the fan area. When there is a choice, side orientation is preferred by most users in high humidity environments.

 
 
 
  • Mounting
  • Drawing

Condensation may form on the cold side fins when the surface temperature goes below the dew point temperature. To reduce the possibility of condensation or to transfer condensate to the outside of the enclosure consider the following:

  • Regulate the fin temperature above the dew point. Equations are provided for this purpose
  • Use desiccant (moisture absorbing granules)
  • Employ condensate removal system or drip pans

FHP-Series and models AHP-1400, AHP-1501 Air Conditioners contain built-in condensate removal systems. The condensate system consists of an anti-fungal sponge with a condensate wick. PVC tubing is also provided for drainage. The wick should extend below the cooling assembly to allow for a gravity feed.

Click on the image for larger view

 
 
 
  • Reliability
  • Table

Reliability:

TECA Model AHP1200XHC

MTBF calculation was made using Telcordia SR-332, Method II.

Mean time between failures prediction ranges from 80,000 hours for ground benign, outdoor, 25C environment to 47,700 hours for ground mobile, outdoor, 70C environment.

On this website under "APPLICATIONS", please also see the ongoing test of TECA Model AHP1800XEHC which has been in continuous service for over 80,000 hours outdoors on the roof. There is also a picture and description of a TECA Model AHP1200X with 120,000 hours of duty with no problems other than dirt!

Using:  Telcordia SR332, Method 2-TELCORDIA2 Prediction Date:  10 Jan 2006
Temperature:  40.00     Environment:  GF  
         
Part   Style QTY F/R (FPMH) MTBF (hours)
Thermostat   NPRD - Data 3 2.531200                    131,690
1   Heater 2 1.900000                    263,158
2   Thermal Overcurrent Circuit Breakers 1 0.399000                2,506,266
3   Tubeaxial Fan 1 0.200000                5,000,000
4   Tubeaxial Fan 1 0.200000                5,000,000
5   Thermoelectric Module 12 0.099005                    841,706
6   Solid State Relay 2 0.050000              10,000,000
7   Bridge Rectifier 1 0.013438              74,418,051
8   Metal Oxide Varisor 1 0.010078              99,224,068
9   Power Resistor 1 0.005322            187,916,234
10   Generic Coil 1 0.001000        1,000,000,000
11   Generic Ceramic Capacitor 1 0.000881        1,135,250,317
12   Polypropylene Capacitor 1 0.000615        1,627,185,717
13   Input Filter 1 0.005295            188,875,248


AHP-1200XHC

  Air Conditioner 1 13.517291               73,979
 
 
 

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