Installation is important:

Installation is important in extending the life of the enclosures. These air-conditioned enclosures and heated enclosures carry a NEMA rating. Therefore, they have exterior mounting brackets and come with punched holes to permit the installation of the AC and fan units, but have no other holes. Any holes an installer makes for power, etc. must be made with proper tools, deburred and water-tight fittings used. We also recommend coating the interior of the cut (the newly exposed metal) with Rust-Seal or another type of protection. In order to keep proper NEMA and UL ratings installers must also keep AC/Heater units upright at all times, and explicitly follow all OEM installation instructions. Also remember, when using conduit coming up into the enclosure from the ground, sealing the exterior of the hole made in the enclosure for the conduit is only half the job; you must also seal the hole inside the enclosure within the conduit itself, around the wiring, to prevent ground condensation and even mice from entering the enclosure from the ground. If you have questions about the NEMA or UL ratings, please give us a call.

Optional E-coating:

An optional E-coating is available for added rust protection (call if interested). E-Coat has been around for many years, but really began to gain prominence with use in the automotive industry; one of the toughest environments there is. Our outdoor enclosures are exposed to all types of weather, including coastal areas where salt air takes a toll on anything metal. Upper U.S. and Canadian installations also have some challenging weather. Epoxy E-Coat offers protection against corrosion and has illustrated superior results in salt-spray and cycle-corrosion testing. A simple explanation of applying E-Coat calls for our enclosure to enter a bath and be fully submerged where a negative charge attracts positively-charged paint particles. The result is a high-performance thin and tough coating ideal for exterior durability with excellent corrosion resistance. Our standard application of outdoor powder coat paint is then applied over the E-Coat to complete a two-coat finish that offers long-term use.

Mier’s Temperature Controlled Enclosures are designed to provide a degree of protection from rain, sleet, snow, ice, dirt, and dust. Mier offers NEMA 4X, NEMA 4, and NEMA 3R type indoor/outdoor enclosures. Mier recommends the air-conditioned and heated (ACHT) models for most applications. Fan-cooled (FC) models are available for applications where the temperature within the cabinet does not require air-conditioned cooling or heating, but only requires the internal air in the enclosures to be filtered and exchanged with the ambient air. It is solely up to the installer to determine their need.

These models cannot be shipped UPS because of size limitations, but must be shipped via common carrier. Depending upon quantities, the air-conditioners may ship on a separate skid from the enclosures.

NOTE: Do not mount enclosures equipped with air-conditioners on outside walls of apartments, offices, condos or homes to prevent AC vibration from becoming a nuisance to those who live/work on the other side of the wall.  Just as a home or business’ AC units are mounted a few feet away or on the roof to prevent noise to those who live/work within, Mier recommends mounting temperature-controlled enclosures on concrete pads using angle-iron or poles, or mounting them on walls not common to living/work areas within.

Choosing the correct enclosure for your application

With an internal heat load of 200 watts:

1. Models which come with a 2000 BTU air-conditioning unit and an internal 500W heater. When installed and functioning properly, will maintain a preset temperature (+/- 3°F). These units are capable of maintaining an 80°F internal temperature (+/- 3°F) up to an outside temperature of 135°F.
2. When installed and functioning properly, the BW-124ACHT maintains a preset temperature (+/- 3°F) up to a maximum of 60° F internal temperature down to an outside temperature of -20°F.
3. When installed and functioning properly, the BW-136ACHT maintains a preset temperature (+/- 3°F) up to a maximum of 60° F internal temperature down to an outside temperature of -10°F.

With an internal heat load of 100 watts:

• Models which come with an 800 BTU air-conditioning unit and an internal 150W heater, when installed and functioning properly, will maintain a preset temperature (+/- 3° F). For example, the BW-1248ACHT is capable of maintaining a 80°F internal temperature (+/- 3°F) up to an outside temperature of 125°F. Furthermore, the BW-124-8ACHT maintains a preset temperature (+/-3° F) up to a maximum of 40°F internal temperature down to outside temperatures of -20°F.

NOTE on ACHT models: If your installation is in warmer or cooler exterior or interior temperatures than these, if your internal heat load is greater, or if you are installing in a coastal or highly corrosive area call Mier Products for advice on special order units. Mier recommends only installing units with window in shaded areas; as interior temperatures of these units reach 20° higher in direct sunlight than units without windows.

NEMA 3R Units with Fans and Air Filters

1. Mier’s BW-124FC or BW-136FC comes with a 115V/300cfm thermostatically-controlled fan with a filter.
2. Mier’s BW-124-8FC comes with a 115V/131cfm thermostatically-controlled fan with a filter.

NOTE on FC models: Fan-cooled enclosures simply exchange internal air for the external air, so the internal temperature of the enclosure will be the same as the exterior environment. Therefore, Fan-Cooled models are not recommended for high-temperature or low temperature environments. Because these units pull external air into the enclosure through a filtering system, they do not meet the NEMA 4 standards of air-conditioned and heated models (ACHT). However, they are designed to NEMA 3R specifications. Therefore, Fan-Cooled models are not recommended for applications where internal components need to be protected from wash down conditions. When using these models you must keep the filters clean and must not block the fan, air intake, or air-flow with items mounted inside the enclosure.

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