초록 ▼

A redundant, dual circuit air conditioning apparatus is provided for communications enclosures which is wall mounted thereon. A conditioned air housing is provided having a blower chamber which contains two air circulation blowers thrusting air into the enclosure and having freely pivotal ducts whic

A redundant, dual circuit air conditioning apparatus is provided for communications enclosures which is wall mounted thereon. A conditioned air housing is provided having a blower chamber which contains two air circulation blowers thrusting air into the enclosure and having freely pivotal ducts which operate in mutual cooperation in response to pressure variations between the chamber and the enclosure. Internested evaporator coils of two discrete refrigeration circuits share common fin connections for efficiency and each includes a dual line input performing in conjunction with an expansion valve and a simple Y distribution fitting coupled to those lines which achieves requisite pressure drops at low cost. Compressor and condenser components are located within a condenser system housing in mutual isolation and perform in conjunction with discrete separate power inputs and controls such that servicing may take place safely upon one air conditioning entity while the other remains in operation to prevent down time during servicing.

대표청구항 ▼

[ We claim:] [1.] In a communications system having a ground supported enclosure for retaining electronic equipment exhibiting a given heat load and having a wall with an air transfer port for cooperating with an air conditioning system, the improved air conditioning apparatus comprising:a condition

[ We claim:] [1.] In a communications system having a ground supported enclosure for retaining electronic equipment exhibiting a given heat load and having a wall with an air transfer port for cooperating with an air conditioning system, the improved air conditioning apparatus comprising:a conditioned air housing mountable upon said wall having a blower chamber located adjacent said air transfer port;a condenser system housing mountable upon said wall;first and second air circulation blowers mounted within said blower chamber having respective first and second blower input ports located within said blower chamber and respective first and second blower air output ports positioned in air input communication with said wall air transfer port;first and second motors selectively energizable to drive respective said first and second blower air circulation blowers to transfer air from said blower chamber through said air transfer port while effecting an air pressure drop at said blower chamber;first and second dampers pivotally mounted at respective said first and second output ports, said first blower damper having a closed orientation blocking air transfer from said enclosure through said first blower air output port when said first motor is de-energized and said second motor is energized and having an open orientation when said first motor is energized, said second damper having a closed orientation blocking air transfer from said enclosure through said second blower air output port when said second motor is de-energized and said first motor is energized and having an open orientation when said second motor is energized, said first and second dampers being freely mounted at respective said first and second output ports for swinging movement derived by air from said blower air output ports and said air pressure drop, about a substantially vertical axis;a first refrigeration circuit having a first condenser coil, a first expansion device, a first compressor energizable to compress refrigerant, and a first evaporator coil, said first evaporator coil being located within said blower chamber in heat transfer association with air passing from said enclosure through said air transfer port, and said first condenser coil, being located within said condenser system housing;a first condenser fan located within said condenser system housing;a third motor located within said condenser system housing and energizable to drive said first condenser fan to effect passage of ambient air across said first condenser coil;a second refrigeration circuit having a second condenser coil, a second expansion device, a second compressor energizable to compress refrigerant, and a second evaporator coil, said second evaporator coil being located within said blower chamber in heat transfer association with air passing through said air transfer port, and said second condenser coil being located within said condenser system housing;a second condenser fan located within said condenser system housing;a fourth motor located within said condenser system housing and energizable to drive said second condenser fan to effect passage of ambient air across said second condenser coil; anda control system responsive to an applied source of power for energizing said first and third motors and said first compressor, and responsive to an alarm condition to energize said second and fourth motors and said second compressor.