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 DISTRIBUTION - DESCRIPTION AND OPERATION
________________________________________
 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, for added protection. The potable water-distribution lines are insulated and electrically heated in section 13 to prevent ice formation in and around the lines (Ref. 30-73-00).

 2.
 System Description

__________________
 A. Distribution
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 001)

R **ON A/C 151-199, 301-399, 401-499,
 (Ref. Fig. 001A)
 **ON A/C 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).
 3. Component Description
_____________________
 A. Water Faucet
 **ON A/C 001-003, 051-052,
 (Ref. Fig. 002)

 Potable Water Distribution Schematic
 Figure 001

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 Potable Water Distribution Schematic
 Figure 001A

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 Component Location Figure 002 
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R **ON A/C 004-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,

 (Ref. Fig. 002A)
 **ON A/C ALL
 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.
 **ON A/C 001-003, 051-052,
 B. Manual Shut-off Valve (Ref. Fig. 002) 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 valve to remain in the 'OPEN' position. The shut-off valve is installed under the toilet shroud. You gain access to the valve through the access panel at the front of the shroud.

R **ON A/C 004-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 B. Manual Shut-off Valve (Ref. Fig. 002A) 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 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 gain access to the control handle through the sanitary cabinet door.

 Component Location
 Figure 002A

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 **ON A/C ALL

 C. Water Heater
 **ON A/C 001-003, 051-052,
 (Ref. Fig. 002)

R **ON A/C 004-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 002A)
 **ON A/C 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 1.5 l (0.4 US gal), 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 hot 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).
　
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