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through the trim air
system, for cabin
pressurization.
− AUX PRESS
has been selected on.
L (R) PACK Switches
Used to inhibit the air conditioning units
− Indicates a PACK failure.
− PACK has been selected off.
OFF
OFF
FAIL
OFF
ON
ON
− Automatic flow control.
− Pack operates in low flow mode.
− Pack operates in high flow mode.
− Flow control valve is driven full open
TEMPERATURE
COCKPIT
COLD HOT
FWD CABIN
COLD HOT
AFT CABIN
COLD HOT
OFF OFF ON
RECIRC TRIM AIR RAM AIR
AUX PRESS
ON
HOT
COLD
L MAN
TEMP
R MAN
TEMP
HOT
COLD
LO HIGH
PACK CONTROL
NORM
MAN
R PACK
OFF
FAIL
L PACK
OFF
FAIL
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
02−10−14
AIR CONDITIONING SYSTEM
The air conditioning system is comprised of flow control valves, air conditioning units, a ram air
system, distribution system, ventilation system and auxiliary pressurization system.
The flow control system regulates airflow from the pneumatic duct to the air conditioning units.
The ACUs decrease the temperature and moisture content of the bleed air from the pneumatic
system. The ACUs are located in the aft equipment bay.
An alternate supply of fresh air is available via the ram air system.
Conditioned air is routed from the cooling packs to the mix manifold (distribution system).
The Avionics and Cockpit Display Exhaust system ensures the ventilation of the avionic equipment
and cockpit displays to prevent excessive heating.
The auxiliary pressurization system provides an alternate pressurization source for the cabin, in the
event of loss of both cooling packs.
GF0210_016
LEFT
FLOW
CONTROL
SYSTEM
LEFT
AIR CONDITIONING
SYSTEM
DISTRIBUTION
SYSTEM
RAM
AIR
PNEUMATIC
SYSTEM
VENTILATION
SYSTEM
RIGHT
AIR CONDITIONING
SYSTEM
RIGHT
FLOW
CONTROL
SYSTEM
AFT PASSENGER
COMPARTMENT
FLIGHT
COMPARTMENT
FORWARD
PASSENGER
COMPARTMENT
FORWARD
OUTFLOW
VALVE
AFT
OUTFLOW
VALVE
TEMPERATURE
CONTROL
SYSTEM
AIR CONDITIONING AND PRESSURIZATION
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−15
AIR CONDITIONING SYSTEM (CONT'D)
The AIR CONDITIONING synoptic is selected using the EICAS Control Panel, located on the
pedestal.
Mix Manifold
Pack Discharge
Temperature
Ram Air
Valve (RAV)
Air Conditioning
Pack
Trim Air
Valve
Compartment Temperature
Duct Supply
Temperature
Hot Air Shut−Off
Valve (HASOV)
Flow Control
Valve (FCV)
Selected Temperature
PACK Flow
Output
GF0210_017
EICAS Control Panel
AIR CONDITIONING
BLEED BLEED
RAM AIR
19°C 21°C 22°C
CKPT FWD AFT
20 °C 20 °C 23 °C
23 °C 23 °C 23 °C
L PACK
TRIM AIR
15°C
R PACK
12°C
LOW
EICAS
SCROLL SYSTEM SELECT
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
02−10−16
AIR CONDITIONING SYSTEM (CONT'D)
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
PACK DISCHARGE
DUCT
RAM AIR
VALVE
MIX
MANIFOLD
AFT PRESSURE BULHEAD REFERENCE
RECIRCULATION FAN (LH)
RIGHT PACK
LEFT PACK PACK
GF0210_018
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.
· 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.
AIR CONDITIONING AND PRESSURIZATION
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
　
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