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LEFT
FLOW
CONTROL
SYSTEM
PNEUMATIC SYSTEM
RIGHT
FLOW
CONTROL
SYSTEM
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
The AIR CONDITIONING synoptic is selected using the EICAS Control Panel, located on the pedestal.
EICAS Control Panel
Selected Temperature
Compartment Temperature
Duct Supply Mix Manifold Temperature
Trim AirPack Discharge ValveTemperature Air Conditioning
Flow Control Valve (FCV) PACK Flow Output
GF0210_017
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
Air Conditioning Packages (PACKS)
The cooling packs decrease the temperature and moisture content of the bleed air from the pneumatic system. The packs are located in the aft equipment bay.
RAM AIR INLET SCOOP
RAM AIR OUTLETS RIGHT PACK
RAM AIR
VALVE
MIX MANIFOLD LEFT PACK PACK
PACK DISCHARGE DUCT
AFT PRESSURE BULHEAD REFERENCE RECIRCULATION FAN (LH) The air conditioning package is composed of two cooling packs which decrease the temperature and moisture content in the bleed air and deliver conditioned air to the mix manifold. The RAM AIR system has two main functions:
.
To supply air to the cooling packs’ heat exchangers.
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To cool the bleed air flow, (alternate air supply source in the event of a dual pack failure) and is designed for use inflight, at altitudes below 15,000 feet.
GF0210_018
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
Cooling Packs
The cooling packs function as follows:
.
Bleed air flows through the FCV into the primary heat exchanger, where it is cooled by ram air.
.
From the primary heat exchanger, the air flows into the compressor of the air cycle machine, where the temperature and pressure are increased.
.
From the compressor, the air enters the main heat exchanger, where the temperature is decreased again.
.
From the main heat exchanger, the air passes into the high pressure water extraction loop (Reheater/Condenser, Water Extractor), where much of the water is removed and temperature is further decreased. The water is evacuated into the ram air cooling flow at the inlet of the heat exchangers to increase cooling efficiency by evaporation.
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From the water extraction loop, the air enters the turbine of the air cycle machine, where the temperature and pressure are decreased.
.
From the turbine, the air flows back through the condenser, where the temperature is increased slightly and is ducted to the mix manifold.
TO MIXINGTO MIXING MANIFOLD MANIFOLD
PDPS
PACK DISCHARGE PRESSURE SENSOR
AIR CYCLE MACHINE (ACM)
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