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PACK
RESTRICTOR
TAV−H
HASOV
HASOV
FROM RIGHT
ENGINE BLEED
FROM LEFT
ENGINE BLEED
MIX
MANIFOLD
TRIM AIR
VALVES
WATER
COLD AIR
HOT AIR
STEAMED AIR
LEGEND
ECS
ECS
ECS
Water is taken form the potable water system and routed to the boiler via 2 normally closed valves.
When the system is activated, the Humidifer Control Unit (HCU) will open both valves to replenish
the boiler. Trim air is used to heat the boiler. The generated steam is then supplied to the ECS mix
manifold. A humidity sensor (HCHS) is installed in the aft cabin to monitor the temperature and
moisture level. The reading from the sensor is feed to the HCU to determine the amount of steam
needed to bring the humidity level within the acceptable range. The amount of steam generated by
the boiler is controlled by the humidifier Trim Air Valve (TAV−H). The TAV−H modulates the air
flow that reaches the boiler thus affecting the amount of steam generated. A restrictor is added to
limit the maximum amount of trim air supplied to the boiler.
The system is activated throught the EMS CDU SWITCH CONTROL page.
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.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
Volume 2
02−10−36
AIR DISTRIBUTION AND EXHAUST (CONT'D)
Humidifier System (Option) (Cont’d)
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 Humidifer
Drain Valve (HDV).
AIR CONDITIONING AND PRESSURIZATION
Rev 12, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−37
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 9127 thru 9158 not incorporating Service Bulletin:
• SB 700−1A11−21−004, 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 ft/min, 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.
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