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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.
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
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).
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND 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.
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.
.
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