DOC AIRBUS | AMM A320FAIR SUPPLY SYSTEM - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
Air pressure is used to pressurize the potable water system.
The air is supplied from the engine bleed air or the Auxiliary Power Unit (APU) or the ground pressure connection.
An additional air supply source to pressurize the potable water system is the air supply boost-system (Ref. AMM 38-42-00).
A depressurization system which is used to release the air pressure in the potable water system in cold weather.
** ON A/C NOT FOR ALL Air pressure is used to pressurize the potable water system.
The air is supplied from the engine bleed air or the Auxiliary Power Unit (APU) or the ground pressure connection.
An additional air supply source to pressurize the potable water system is the air supply boost-system (Ref. AMM 38-42-00).
A depressurization system which is used to release the air pressure in the potable water system in cold weather.
2. Component Location
Air Supply System ** ON A/C NOT FOR ALL
Air Supply System ** ON A/C NOT FOR ALL
Air Supply System ** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL Air Supply System ** ON A/C NOT FOR ALL Air Supply System ** ON A/C NOT FOR ALL Air Supply System ** ON A/C NOT FOR ALL | FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||||
| 3000MM | TANK-POTABLE WATER | 161DW | 171 | 38-11-41 | |
| ** ON A/C NOT FOR ALL | |||||
| 3000MM | TANK-POTABLE WATER | 161DW | 138 | 38-11-41 | |
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| 3000MM | TANK-POTABLE WATER | 171 | 38-11-41 | ||
| ** ON A/C NOT FOR ALL | |||||
| 4215MM | SHUTTLE VALVE-AIR | 171 | 38-41-44 | ||
| 4210MM | FILTER-AIR | 161DW | 171 | 38-41-42 | |
| 4205MM | VALVE-CHECK | 161DW | 171 | 38-41-41 | |
| ** ON A/C ALL | |||||
| 4200MM | VALVE-PRESSURE REDUCING | 161DW | 171 | 38-41-43 | |
| ** ON A/C NOT FOR ALL | |||||
| 4215MM | SHUTTLE VALVE-AIR | 137 | 38-41-44 | ||
| 4210MM | FILTER-AIR | 137 | 38-41-42 | ||
| 4205MM | VALVE-CHECK | 137 | 38-41-41 | ||
| ** ON A/C NOT FOR ALL | |||||
| 4MD | VALVE-DEPRESS. | 171 | 38-42-44 | ||
| ** ON A/C NOT FOR ALL | |||||
| 4MD | VALVE-DEPRESS. | 131PW | 137 | 38-42-44 | |
3. System Description
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System Schematic ** ON A/C NOT FOR ALL A. Compressed Air Line
In the compressed air line there is:
In the compressed air line there is:
In the compressed air line there is:
Because the lines under the floor are insulated and heated.
In the compressed air line there is:
- A shuttle valve that will always direct the pressurized air in the direction of the potable water tank. The system is supplied from the bleed-air cross-feed line or from the ground air-pressure connection.
- The compressed air will flow through a check valve only in the direction of the water tank.
- A pressure reducing and relief valve that keeps the compressed air pressure at the system operational pressure.
- The valve will also release air from the system, if the pressure goes above the maximum value.
In the compressed air line there is:
- A shuttle valve that will always direct the pressurized air in the direction of the potable water tank. The system is supplied from the bleed air crossfeed-line or from the ground air pressure connection.
- A check valve that lets the compressed air flow only in the direction of the water tank.
- A pressure reducing and relief valve that keeps the compressed air pressure at the system operational pressure.
- The valve will release air from the system, if the pressure goes above the maximum value.
- A depressurization system is installed in the air supply system to depressurize the potable water system quickly (in cold weather conditions) from the FWD attendant panel (Ref. AMM 38-41-00).
- a motorized depressurization valve 4MD which is installed in the air supply line between the tank and the pressure reducing valve 4200MM.
- a control switch on the Forward Attendant Panel (FAP).
NOTE: The depressurization system is described in ATA (Ref. AMM 38-41-00), but the removal and installation of the depressurization valve 4MD is in ATA (Ref. AMM 38-42-44).
When you operate the control switch WTR SYSTEM DEPRE on the FAP: - The depressurization system releases the air pressure in the potable water system.
- The potable water which is in the system above the cabin floor (galley, lavatories and the supply lines) will drain back into the potable water tank.
Potable water will also stay in the supply lines under the floor. Because these lines are insulated and heated, the water in them will not freeze.
In the compressed air line there is:
- A shuttle valve that always directs the pressurized air in the direction of the potable water tank. The system is supplied from the bleed air crossfeed-line or from the ground pressure connection
- A check valve that lets compressed air flow only in the direction of the water tank
- A pressure reducing and relief valve that keeps the compressed air pressure at the system operational pressure
- The valve release air from the system, if the pressure goes high or above the maximum value
- A depressurization system is installed in the air supply system to depressurize the potable water system quickly (in cold weather conditions) from the FAP (Ref. AMM 38-41-00).
- Motorized depressurization valve 4MD which is installed in the air supply line between the tank and pressure reducing valve 4200MM
- A control switch on the Flight Attendant Panel (FAP).
NOTE: The depressurization system is described in ATA (Ref. AMM 38-41-00), but the removal and the installation of depressurization valve 4MD is described in ATA (Ref. AMM 38-42-44).
When you push the pushbutton switch 'WATER DEPRESS' on the FAP: - The depressurization system releases the air pressure in the potable water system
- The potable water which is in the system above the cabin floor (galley, lavatories and the supply lines) will drain back into the potable water tank.
Because the lines under the floor are insulated and heated.
B. Potable Water-Service Panel
On the potable water-service panel there is:
On the potable water-service panel there is:
On the potable water-service panel there is:
On the potable water-service panel there is:
(1) A ground pressure connection to pressurize the water system when the engines or the APU do not operate.
(2) A ground pressure connection to pressurize the water system when the engines or the APU do not operate.
4. Operation
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL
Depressurization System - Electrical Schematic ** ON A/C NOT FOR ALL
Depressurization System - Electrical Schematic ** ON A/C NOT FOR ALL
Depressurization System - Electrical Schematic ** ON A/C NOT FOR ALL
Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System Schematic ** ON A/C NOT FOR ALL Depressurization System - Electrical Schematic ** ON A/C NOT FOR ALL Depressurization System - Electrical Schematic ** ON A/C NOT FOR ALL Depressurization System - Electrical Schematic ** ON A/C NOT FOR ALL A. Compressed Air System
The compressed air (irrespective of the source which supplies it) flows from the shuttle valve to the potable water tank. It flows through the air filter, the check valve and the pressure reducing/relief valve to the potable water tank.
The air filter removes all unwanted materials which are in the compressed air.
The check valve is installed between the pressure reducing/relief valve and the air filter. It lets the compressed air flow in the direction of the water tank only.
The compressed air (irrespective of the source which supplies it) flows from the shuttle valve to the potable water tank. It flows through the air filter, the check valve and the pressure reducing/relief valve to the potable water tank.
The air filter removes all unwanted materials from the compressed air.
The check valve is installed between the pressure reducing/relief valve and the air filter. The compressed air will flow through this valve only in the direction of the water tank.
An air-no-water valve is installed in the potable water tank. It is located at the end of the compressed air line to make sure that no water comes in the compressed air system.
The compressed air (irrespective of the source which supplies it) flows from the shuttle valve to the potable water tank. It flows through the air filter, the check valve and the pressure reducing/relief valve to the potable water tank.
The air filter removes all unwanted materials which are in the compressed air.
The check valve is installed between the pressure reducing/relief valve and the air filter. It lets the compressed air flow in the direction of the water tank only.
An air-no-water valve is installed in the potable water tank. It is located at the end of the compressed air line to make sure that no water comes in the compressed air system.
The compressed air (irrespective of the source which supplies it) flows from the shuttle valve to the potable water tank. It flows through the air filter, the check valve and the pressure reducing/relief valve to the potable water tank.
The air filter removes all unwanted materials which are in the compressed air.
The check valve is installed between the pressure reducing/relief valve and the air filter. It lets the compressed air flow in the direction of the water tank only.
The compressed air (irrespective of the source which supplies it) flows from the shuttle valve to the potable water tank. It flows through the air filter, the check valve and the pressure reducing/relief valve to the potable water tank.
The air filter removes all unwanted materials from the compressed air.
The check valve is installed between the pressure reducing/relief valve and the air filter. The compressed air will flow through this valve only in the direction of the water tank.
An air-no-water valve is installed in the potable water tank. It is located at the end of the compressed air line to make sure that no water comes in the compressed air system.
The compressed air (irrespective of the source which supplies it) flows from the shuttle valve to the potable water tank. It flows through the air filter, the check valve and the pressure reducing/relief valve to the potable water tank.
The air filter removes all unwanted materials which are in the compressed air.
The check valve is installed between the pressure reducing/relief valve and the air filter. It lets the compressed air flow in the direction of the water tank only.
An air-no-water valve is installed in the potable water tank. It is located at the end of the compressed air line to make sure that no water comes in the compressed air system.
B. The Depressurization System
When you push the membane switch WTR SYSTEM DEPRE on the FAP, the control relay 2MD is energized through:
When the depressurization valve 4MD is in the open posistion:
When you push the soft key WATER DEPR on the FAP, control relay 2MD is energized through:
When depressurization valve 4MD is in the open position:
The pressure reducing/relief valve decreases the air pressure between 2.83 bar (41 psi) and 3.24 bar (47 psi) to the system working pressure between 1.72 bar (25 psi) and 1.93 bar (28 psi).
The pressure relief section of the valve will operate and release the air out of the system, if the pressure increases from 2.21 bar (32 psi) to 2.48 bar (36 psi).
The pressure reducing/relief valve reduces the air pressure from between 2.83 bar (41.0457 psi) and 3.24 bar (46.9922 psi) to the system working pressure 1.75 bar (25.3816 psi) to 1.93 bar (27.9923 psi).
The pressure relief section of the valve will operate and release the air out of the system if the pressure increases to a pressure of 2.21 bar (32.0533 psi) to 2.48 bar (35.9693 psi).
When you push the membane switch WTR SYSTEM DEPRE on the FAP, the control relay 2MD is energized through:
- the vacuum system controller when the service panel door 172AR is open,
- the Landing Gear Control and Interface Unit 2 (LGCIU 2) if the service panel door 172AR is closed.
When the depressurization valve 4MD is in the open posistion:
- the indication light WTR SYSTEM DEPRE on the FAP comes and stays on,
- the vacuum system indication light SYSTEM INOP on the FAP comes and stays on.
When you push the soft key WATER DEPR on the FAP, control relay 2MD is energized through:
- The CIDS DEU B
- The Landing Gear Control and Interface Unit 2 (LGCIU 2).
When depressurization valve 4MD is in the open position:
- The indication on the FAP Water and Waste page (WWP)-List box shows VACUUM SYSTEM DISABLED - WATER DEPRESS ACTIVE
- The aircraft symbol shows NO WATER PRESSURE
- The vacuum system will not operate.
- When you press the soft key WATER DEPR and the YES key at the blue confirmation window on the FAP.
The pressure reducing/relief valve decreases the air pressure between 2.83 bar (41 psi) and 3.24 bar (47 psi) to the system working pressure between 1.72 bar (25 psi) and 1.93 bar (28 psi).
The pressure relief section of the valve will operate and release the air out of the system, if the pressure increases from 2.21 bar (32 psi) to 2.48 bar (36 psi).
The pressure reducing/relief valve reduces the air pressure from between 2.83 bar (41.0457 psi) and 3.24 bar (46.9922 psi) to the system working pressure 1.75 bar (25.3816 psi) to 1.93 bar (27.9923 psi).
The pressure relief section of the valve will operate and release the air out of the system if the pressure increases to a pressure of 2.21 bar (32.0533 psi) to 2.48 bar (35.9693 psi).