DOC AIRBUS | AMM A320FDISTRIBUTION - DESCRIPTION AND OPERATION
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** ON A/C NOT FOR ALL
1. General
Potable water from the water tank is supplied through a system of distribution lines. Routing for the distribution lines to the front and rear galleys and lavatories is below the passenger compartment floor. A part of the forward distribution line to the front services goes through a hose.
This hose is to protect the electronic avionic bay in case of water leaks. The end of this hose ends in the bilge. If there is a leak, the water will drain out of the fuselage drains.
The potable water-distribution lines are insulated and electrically heated to prevent ice formation in and around the lines (Ref. AMM D/O 30-73-00-00).
A water conditioner is installed in the distribution line of the potable water system.
** ON A/C NOT FOR ALL Potable water from the water tank is supplied through a system of distribution lines. Routing for the distribution lines to the front and rear galleys and lavatories is below the passenger compartment floor. A part of the forward distribution line to the front services goes through a hose.
This hose is to protect the electronic avionic bay in case of water leaks. The end of this hose ends in the bilge. If there is a leak, the water will drain out of the fuselage drains.
The potable water-distribution lines are insulated and electrically heated to prevent ice formation in and around the lines (Ref. AMM D/O 30-73-00-00).
A water conditioner is installed in the distribution line of the potable water system.
2. Component Location
Component Location
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3. System Description
A. Distribution
Potable Water Distribution Schematic ** ON A/C NOT FOR ALL
Potable Water Distribution Schematic ** ON A/C NOT FOR ALL
Potable Water Distribution Schematic ** ON A/C NOT FOR ALL
Potable Water Distribution Schematic ** ON A/C NOT FOR ALL
Mechanically or electrically operated valves control the supply of the potable water system. Compressed air is used to pressurize the system to supply water from the tank to the necessary service locations.
Compressed air is tapped from the cross feed line of the engine bleed air and is connected to the water tank air-inlet (Ref. AMM 38-41-00).
Potable Water Distribution Schematic ** ON A/C NOT FOR ALL Potable Water Distribution Schematic ** ON A/C NOT FOR ALL Potable Water Distribution Schematic ** ON A/C NOT FOR ALL Potable Water Distribution Schematic ** ON A/C NOT FOR ALL Compressed air is tapped from the cross feed line of the engine bleed air and is connected to the water tank air-inlet (Ref. AMM 38-41-00).
4. Component Description
A. Water Faucet
The water faucets have a self-venting mixing valve, push-lever and spout.
The mixing valve includes a time delay device and is connected to the hot (water heater) and the cold-water supply lines. The push-lever is installed on the mixing valve and includes hot (red) and cold (blue) water identification and selection arrows. Hot water, mixed flow, or cold water is available when light pressure is applied to the push-lever. Water flow will stop automatically after release of the push-lever and completion of the mixing-valve time-delay sequence.
The electronic water faucet with infrared sensor supplies water to the washbasin. The operation is automatic, and reduces the usage of water to a minimum. It lets the passengers wash their hands with minimal physical contact with the faucet.
The water faucet assembly has three major modules:
Membrane switches on the upper surface of the faucet let you select hot or cold water temperature. The switches also give manual control of the water flow.
The selected water temperature will stay the same as long as the water flows, and up to twelve seconds after the water flow stops. If no temperature range is manually selected, warm water will flow when the infrared sensor is activated.
If either the hot or cold membrane switch is activated, water will flow for four seconds. This time period lets you place your hands under the faucet, at this time the infrared sensor takes over.
The infrared activation of the water flow stops one second after you remove your hands from the sensing region.
To protect the lavatory against overflow, the electronic water faucet has an internal timer. This internal timer limits the continuous water flow to 45 seconds if your hands or object stay longer than this time in the sensing region.
To prevent water from flowing into the washbasin when you do the cleaning, you must:
The mixing valve includes a time delay device and is connected to the warm (water heater) and the cold-water supply lines. The push cap is installed on the mixing valve. Warm water or cold water or mixed flow is available when light pressure is applied to the push cap. Clockwise and counterclockwise turn of the push cap can control the temperature of the water. Water flow will stop automatically after release of the push cap and completion of the mixing-valve time-delay sequence.
The water faucets have a self-venting mixing valve, push-lever and spout.
The mixing valve includes a time delay device and is connected to the hot (water heater) and the cold-water supply lines. The push-lever is installed on the mixing valve and includes hot (red) and cold (blue) water identification and selection arrows. Hot water, mixed flow, or cold water is available when light pressure is applied to the push-lever. Water flow will stop automatically after release of the push-lever and completion of the mixing-valve time-delay sequence.
The electronic water faucet with infrared sensor supplies water to the washbasin. The operation is automatic, and reduces the usage of water to a minimum. It lets the passengers wash their hands with minimal physical contact with the faucet.
The water faucet assembly has three major modules:
- The water faucet assembly with temperature actuation switches and infrared sensor
- The hydraulic box assembly with flow control valves
- The electronic control box.
Membrane switches on the upper surface of the faucet let you select hot or cold water temperature. The switches also give manual control of the water flow.
The selected water temperature will stay the same as long as the water flows, and up to twelve seconds after the water flow stops. If no temperature range is manually selected, warm water will flow when the infrared sensor is activated.
If either the hot or cold membrane switch is activated, water will flow for four seconds. This time period lets you place your hands under the faucet, at this time the infrared sensor takes over.
The infrared activation of the water flow stops one second after you remove your hands from the sensing region.
To protect the lavatory against overflow, the electronic water faucet has an internal timer. This internal timer limits the continuous water flow to 45 seconds if your hands or object stay longer than this time in the sensing region.
To prevent water from flowing into the washbasin when you do the cleaning, you must:
- Push and hold both the HOT and COLD membrane switches for more than 5 seconds.
The mixing valve includes a time delay device and is connected to the warm (water heater) and the cold-water supply lines. The push cap is installed on the mixing valve. Warm water or cold water or mixed flow is available when light pressure is applied to the push cap. Clockwise and counterclockwise turn of the push cap can control the temperature of the water. Water flow will stop automatically after release of the push cap and completion of the mixing-valve time-delay sequence.
B. Manual Shut-off Valve(s)
Component Location ** ON A/C NOT FOR ALL
Component Location ** ON A/C NOT FOR ALL
Component Location ** ON A/C NOT FOR ALL
The manual shut-off valve isolates the water faucet and the toilet from the potable-water distribution system, when closed. It is usual for the shut-off valve to remain in the 'OPEN' position. The shut-off valve is installed under the toilet shroud. A control handle which is attached to the shut-off valve is used to close and open the valve.
The control handle is located on the sanitary cabinet wall, under the washbasin just above the lavatory floor.
You can gain access to the control handle through the sanitary cabinet door.
Component Location ** ON A/C NOT FOR ALL Component Location ** ON A/C NOT FOR ALL Component Location ** ON A/C NOT FOR ALL The control handle is located on the sanitary cabinet wall, under the washbasin just above the lavatory floor.
You can gain access to the control handle through the sanitary cabinet door.
C. Water Heater
Component Location ** ON A/C NOT FOR ALL
Component Location ** ON A/C NOT FOR ALL
Component Location ** ON A/C NOT FOR ALL
Water Heater - Electrical Schematic ** ON A/C NOT FOR ALL
Water Heater - Electrical Schematic ** ON A/C NOT FOR ALL
Water Heater - Electrical Schematic ** ON A/C NOT FOR ALL
Water Heater - Electrical Schematic ** ON A/C NOT FOR ALL
The water heater is installed under the washbasin, inside the sanitary unit cabinet. The potable-water supply line is connected to the heater inlet and the outlet is connected to the water faucet. The water heater has a capacity of 1.42 l (0.4 USgal), the maximum quantity of water that can be heated at one time. The water heater ON/OFF switch is found on the top part of the unit.
When you set the ON/OFF switch to ON, the water heating element energizes (control light is on). When the water heats to a set temperature, a thermostat opens to remove the electrical power from the heating element. When the water temperature drops (usual heat decrease or as cold water replaces used warm water), the thermostat closes to energize the heating element again.
This sequence continues for as long as the water temperature changes and the ON/OFF switch is set to ON.
The thermostat is set to open (GO OFF), when the water temperature increases to 51.7 DEG.C (125.06 DEG.F). It is set to close (COME ON), when the water temperature decreases to 45 DEG.C (113.00 DEG.F).
An over-temperature safety device which has a temperature range of 72 DEG.C (161.60 DEG.F) to 82 DEG.C (179.60 DEG.F) protects the heating element.
You can reset the safety device with the pushbutton which is on the top part of the water heater (under a cover).
Component Location ** ON A/C NOT FOR ALL Component Location ** ON A/C NOT FOR ALL Component Location ** ON A/C NOT FOR ALL Water Heater - Electrical Schematic ** ON A/C NOT FOR ALL Water Heater - Electrical Schematic ** ON A/C NOT FOR ALL Water Heater - Electrical Schematic ** ON A/C NOT FOR ALL Water Heater - Electrical Schematic ** ON A/C NOT FOR ALL When you set the ON/OFF switch to ON, the water heating element energizes (control light is on). When the water heats to a set temperature, a thermostat opens to remove the electrical power from the heating element. When the water temperature drops (usual heat decrease or as cold water replaces used warm water), the thermostat closes to energize the heating element again.
This sequence continues for as long as the water temperature changes and the ON/OFF switch is set to ON.
The thermostat is set to open (GO OFF), when the water temperature increases to 51.7 DEG.C (125.06 DEG.F). It is set to close (COME ON), when the water temperature decreases to 45 DEG.C (113.00 DEG.F).
An over-temperature safety device which has a temperature range of 72 DEG.C (161.60 DEG.F) to 82 DEG.C (179.60 DEG.F) protects the heating element.
You can reset the safety device with the pushbutton which is on the top part of the water heater (under a cover).
D. Rinse Valve
The toilet rinse valve is solenoid controlled and is electrically operated (Ref. AMM 38-31-00).
The toilet rinse valve is solenoid controlled and is electrically operated (Ref. AMM 38-31-00).
E. Water Conditioner
The water conditioner in the potable water system is a permanent magnetic unit. It is to prevent calcification in the potable water system, and clogging in the vacuum lines with minerals.
The magnetic effect of the water conditioner is lower than that of the earth magnetic value. This is done to prevent magnetic influence to the aircraft systems.
An insulation mat protects the water conditioner against freezing.
The water conditioner in the potable water system is a permanent magnetic unit. It is to prevent calcification in the potable water system, and clogging in the vacuum lines with minerals.
The magnetic effect of the water conditioner is lower than that of the earth magnetic value. This is done to prevent magnetic influence to the aircraft systems.
An insulation mat protects the water conditioner against freezing.