dirt. If the unit does not have power applied to it, supply a protective covering. It is important to ensure that the components stay as clean as possible. It may be necessary to clean the interior once construction is completed.
•Keep drawings and manuals accessible for detailed installation and operation instructions. It is important that the manuals be available for equipment operators.
2.2Harsh Environments
NOTE!
The mechanical and electrical components within the option panel can be adversely affected by the environment. The effects of contaminants in the air, either solid, liquid, or gas, are difficult to quantify and control.
2.2.1 Airborne Liquids
Liquids in the air can condense in components. Water carried in the air is easily measured as relative humidity, but other vapors are often more difficult to measure or control. Steam, oil and salt water vapor may cause corrosion of components. In such environments, use TYPE 12 enclosures to limit the exchange of outside air into the option enclosure. Extremely harsh environments may require a higher level of protection.
2.2.2 Airborne Solids
Particles in the air may cause mechanical, electrical or thermal failure in components. A TYPE 1 enclosure provides a reasonable degree of protection against falling particles, but it will not prevent the fan from pulling dirty air into the enclosure.
2.2.3 Corrosive Chemicals
In environments with high temperatures and humidity, corrosive gases such as sulfur, nitrogen and chlorine compounds cause corrosion to occur in components. Indications of corrosion are blackened copper or rust on steel or oxidized aluminum. In such environments, it is recommended that the equipment be mounted in a cabinet with fresh air ventilation and that corrosive compounds be kept away. A
