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GF0210_031
L−R PACK AUTO FAIL
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−26
AIR CONDITIONING SYSTEM (CONT'D)
Temperature Control − MAN
In the event of loss of all automatic control, the cooling pack can be manually controlled by the
crew, by selecting the PACK control selector to MAN. The temperature is controlled by the
HOT/COLD toggle switches located on the BLEED/AIR CONDITIONING control panel.
GF0210_032
LO HIGH
PACK CONTROL
NORM
MAN
AUX PRESS
ON
HOT
COLD
L MAN
TEMP
R MAN
TEMP
HOT
COLD
The TCV opening is controlled by the toggle switches, which control the packs discharge
temperature. During manual operation, the crew should monitor the pack discharge temperatures
to ensure that the temperatures remain in acceptable limits. A minimum of 5°C to avoid ice build
up and a maximum of 60°C for passenger comfort, are recommended.
GF0210_033a
HOT/COLD Toggle Switches
Selecting the spring-loaded toggle
switch to HOT or COLD will control
temperature of PACK discharge
through the TCV, when PACK
control is selected to MAN. BLEED BLEED
RAM AIR
L PACK R PACK
L−R PACK AUTO FAIL
R PACK MAN TEMP
MAN
AUX PRESS
ON
HOT
COLD
L MAN
TEMP
R MAN
TEMP
HOT
COLD
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−27
AIR CONDITIONING SYSTEM (CONT'D)
Temperature Control − MAN (Cont’d)
In manual mode, compressor overheat protection is carried out by the compressor pneumatic
overheat sensor (CPNOH), since the ACSC is not active. In the event of an overtemperature,
monitor the pack discharge temperature and use the toggle switch to cool.
GF0210_034a
AIR CYCLE
MACHINE (ACM)
TEMPERATURE
CONTROL VALVE
(TCV)
PLENUM
BLEED
AIR
NOTE
To avoid "overshooting" desired temperature, do not
toggle for more than two seconds duration.
BLEED BLEED
RAM AIR
L PACK R PACK
HI TEMP
COMPRESSOR MAN
PNEUMATIC
OVERHEAT
SENSOR (CPNOH)
L PACK TEMP
L PACK MAN TEMP
Air Conditioning Bleed Leak Detection
When a leak is detected, a message is displayed on EICAS and the BMC will automatically close
the affected FCV, PRV, XBLEED, and the LCV to isolate and stop the leak.
GF0210_035a
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
12 °C
TRIM AIR
12 °C
L PACK R PACK
R BLEED LEAK
HIGH
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−28
AIR DISTRIBUTION AND EXHAUST
Conditioned air is routed from the cooling packs to the mix manifold. The mix manifold also receives
recirculated air from the passenger cabin.
AFT PRESSURE BULKHEAD
TO
AFT
CABIN
TO
FWD
CABIN
COCKPIT
RECIRCULATED
AIR FROM CABIN
RECIRCULATED AIR
FROM CABIN
COOL AIR TO
GASPERS
MIX MANIFOLD TRIM AIR VALVES (3)
GF0210_036a
TO
Flow Control
The mix manifold, mounted underfloor, receives fresh air from the packs and passenger cabin via
the recirculation system. The quantity of air distributed to the various occupied compartments and
the thermal requirement of each compartment are preset values. The split of flows to the three
compartments is through suitably sized orifices at the exit ports of the mix manifold.
The distribution of airflow under steady state conditions is as follows:
• Cockpit − 22% of total flow
• FWD Cabin − 39% of total flow
• AFT Cabin − 39% of total flow
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−29
AIR DISTRIBUTION AND EXHAUST (CONT'D)
Air Distribution and Flow Paths
OVERHEAD
GASPER
CEILING
OUTLET
SIDE PANEL
OUTLET
SIDE CONSOLE
OUTLET
COCKPIT SUPPLY
GASPER
SUPPLY
CABIN
GASPERS
AFT CABIN
SUPPLY
FWD OUTFLOW
VALVE
EXHAUST
VENT
FWD CABIN
SUPPLY
RECIRCULATION
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