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Volume 2
02−10−17
AIR CONDITIONING SYSTEM (CONT'D)
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.
· 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.
PRIMARY HEAT
EXCHANGER
WATER
SPRAYER
CONDENSER
TO MIXING
MANIFOLD
PDPS AFT PRESSURE BULKHEAD PDPS
WATER
EXTRACTOR
TO MIXING
MANIFOLD
RE
HEATER
PACK TEMPERATURE
SENSOR (PTS)
AIR CYCLE
MACHINE (ACM)
TEMPERATURE
CONTROL VALVE
(TCV)
PLENUM
FLOW CONTROL
VALVE (FCV)
RAM AIR
VALVE
BLEED
AIR
WATER
EXTRACTION
LOOP
DUAL HEAT
EXCHANGER
PACK DISCHARGE
TEMPERATURE
SENSOR (PDTS)
PDTS
PTS
FCV
ACM
CPNOH CPNOH
CDTS CDTS
TCV
RAM
AIR INLET
CHECK VALVE
BLEED
AIR
COMPRESSOR PNEUMATIC
OVERHEAT SENSOR
COMPRESSOR DISCHARGE
TEMPERATURE SENSOR
PACK DISCHARGE
PRESSURE SENSOR
GF0210_019
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
02−10−18
AIR CONDITIONING SYSTEM (CONT'D)
Cooling Packs (Cont’d)
The cooling packs are shutoff (FCV closed) under the following circumstances:
· In AUTO operation, by the ACSC acting on the FCV torque motor due to:
· Bleed failure or shutdown (on BMC demand).
· Engine starting (on BMC demand).
· During ditching operation, if airplane is below 15,000 feet.
· Pack inlet overheat.
· Compressor discharge overheat.
· Pack discharge overheat.
· Pack discharge underpressure.
Full closed
position to ACSC
Torque motor
control from ACSC
FCV
PACK
GF0210_020
BLEED FCV
15 °C
L PACK
L PACK FAIL
L PACK
OFF
FAIL
· In AUTO or MANUAL operation, by the compressor pneumatic overheat sensor (CPNOH),
acting pneumatically on the FCV actuator due to compressor discharge overheat or by crew
selection of the PACK switch, acting on the FCV solenoid.
ON/OFF solenoid
command from L
or R PACK switch
GF0210_021
FCV
PACK
BLEED
L PACK
12 °C
L PACK OFF
L PACK
OFF
FAIL
L PACK
OFF
FAIL
AIR CONDITIONING AND PRESSURIZATION
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−19
AIR CONDITIONING SYSTEM (CONT'D)
Flow Control System
The flow control system regulates airflow from the pneumatic duct to the air conditioning units.
The flow control system interfaces with:
· Bleed Air System − The flow control system takes bleed air from the engine, the APU, or a
ground source and provides filtered air into the air conditioning units.
· Air Conditioning System Controllers (ACSC) which measure, calculate and control the
airflow.
· Air Conditioning Units (packs) which use the filtered air supply.
A flow control valve (FCV) will modulate to meet a preset flow schedule and is normally controlled
by the Air Conditioning System Controller (ACSC).
When an overheat is detected, the ACSC will automatically close the FCV and display the affected
caution message on EICAS.
GF0210_022
BLEED FCV
PACK
FLOW CONTROL
VALVE
TO ACSC
PACK INLET
BLEED AIR FROM
PNEUMATIC SYSTEM
BLEED FILTER
SCAVENGE AIR LINE TO
RAM AIR OUTLET DUCT
OZONE CONVERTER
TO ACSC
P
P
PACK INLET
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