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activated with a toggle switch located on the co-pilot bulkhead.
The humidifier will operate when all of the following condition are met:
• the aircraft altitude is greater than 31,000 feet;
• one of the ECS hot air SOV (HASOV) is open;
• the AUXILIARY PRESS is OFF;
• water tank is not empty;
• the cabin dew point is below 0°C.
The humidifier will turn OFF for any of the following conditions:
• communication between the ASCS and HCU is inoperative;
• the aircraft altitude is less than 29,000 feet;
• both ECS HASOV are closed;
• the AUXILIARY PRESS is ON;
• water tank is empty;
• the cabin dew point is above 0°C.
In order to avoid icing in the components during ground cold soak or bacteria proliferation during
storage in warm weather, the system is drained after each flight. When the aircraft altitude falls
below 20,000 ft, the HCU will close both the HWSOV and the HWFV, and open the Humidifier
Drain Valve (HDV).
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−36
PRESSURIZATION
The Cabin Pressure Control System (CPCS), is an electrical system, except for pressure relief
function, which is composed of two cabin pressure controllers, two electrical Outflow Valves (OFV),
two safety valves (SFV) and an electrical control panel.
GF0210_044
CABIN PRESSURE
CONTROLLER
OUTFLOW
VALVE
OUTFLOW
VALVE
SAFETY
VALVE
SAFETY
VALVE
DAU
DAU
PRESSURIZATION
CONTROL
PANEL
CABIN PRESSURE
CONTROLLER
Each controller contains two automatic channels and a manual channel. The two automatic channels
are fully redundant. The manual channel is almost fully redundant, except for cabin altitude limitation,
where the signal output from each manual channel affects only one OFV.
The CPCS includes three independent control channels:
• Two identical, independent and AUTO channels are available from the two digital CPCs.
Either CPC drives both electrical OFVs in turn.
• One MANUAL control channel performs the control of both OFVs. The control is done by
moving a toggle switch located on the Cabin Pressurization Control Panel, to raise or lower the
cabin altitude.
The cabin is controlled to an altitude of no more than 5,670 feet at 51,000 feet airplane altitude and
no more than 4,500 feet when flying at 45,000 feet.
Effectivity:
• Airplanes 9002 thru 9158 not incorporating Service Bulletin:
• SB 700−21−034, Modification − Pressurization Control − Cabin Altitude Reduction During
Flight for Improved Passenger Comfort.
The cabin is controlled to an altitude of no more than 7,230 feet at 51,000 feet airplane altitude and
no more than 6,000 feet when flying at 45,000 feet.
The CPCS allows for two cabin rate selections in automatic control:
• NORMAL − Provides 300 fpm cabin descent and 500 fpm climb rate limit.
• HIGH − Provides a variable rate limit, up to 800 fpm, depending on airplane vertical speed.
The system includes safety devices, which override AUTO and MANUAL mode for OFV travel
limitation, cabin limitation and differential pressure limits.
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−37
PRESSURIZATION (CONT'D)
In both AUTO and MANUAL modes, the CPCS provides indication of cabin pressure parameters on
the STATUS page and any failures are displayed on EICAS.
The CPCS provides means to rapidly depressurize the cabin, through an EMER DEPRESS switch
on the pressurization Control Panel. Additionally, a DITCHING switch performs the shutdown of both
packs and depressurizes the cabin, prior to closing both OFVs.
Controls are provided on the Pressurization Control Panel, located on the overhead panel.
GF0210_091
AUTO/MAN switch
Used to select mode of
operation.
−Indicates MAN mode is
selected.
DITCHING switch
Used to:
Depressurize cabin.
Shut-off packs.
Close outflow valves.
− Indicates DITCHING
selected.
OUTFLOW VLV switch
Used to select outflow valve(s)
closed.
− Indicates valve is
closed.
EMER DEPRESS switch
Used to select emergency
depressurization of airplane.
− Indicates EMER
DEPRESS selected.
MAN ALT Toggle switch
Used to control cabin altitude in manual mode.
UP − Commands cabin to climb.
DN − Commands cabin to descend.
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