*
The aft distribution lines to the lavatories and galleys

*
The tanks.

Isolation
The isolation/drain valve and the isolation valve isolate system components forward of the valves from the system components aft of the valves.
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WATER STORAGE AND DISTRIBUTION -FUNCTIONAL DESCRIPTION

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WATER STORAGE AND DISTRIBUTION -OPERATION -FILL
Aft Potable Water Service Panel
Connect the water supply line to the tank fill port. Pull the tank fill valve handle to the OPEN position. Water will flow out of the overboard line when the tanks are full. You can use the gauge if you do not want to fill the tanks completely.
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WATER STORAGE AND DISTRIBUTION -OPERATION -FILL

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WATER STORAGE AND DISTRIBUTION -OPERATION -FILL

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777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.

WATER STORAGE AND DISTRIBUTION -OPERATION -DRAIN

System Drainage
This is a summary of the procedure to drain the water storage and distribution system:
*
Put the isolation/drain valve in the DRAIN position (entry door 2 left area, not shown)

*
Make sure the isolation valve is in the OPEN position

*
Make sure the water supply shut off valve for each lavatory and each wet galley is in the OPEN position (not shown)

*
Open the drain valve for each lavatory (not shown)

*
Open the drain valve or faucet for each wet galley (not shown)

*
Pull the forward system drain valve handle

*
Pull the aft system drain handle.

NOTE: The forward drain valve handle looks like you need to pull and then turn it to lock the drain valve open. It is not necessary to turn the handle to lock the valve open or close. You pull the handle to open the valve or push the handle to close the valve.
The water flows overboard through these three places:
*
Forward system drain

*
Aft system drain

*
Overflow/tank drain.

The forward system drain is on the right side of the airplane and below the leading edge of the wing. The aft system drain is on the left side of the airplane, forward and across from the aft service panel. The overflow/tank drain is aft of the aft service panel.
WARNING: DRAIN THE POTABLE WATER SYSTEM AT A MINIMUM OF 1 TIME EACH 3 DAYS IN ORDER TO PREVENT THE GROWTH OF BACTERIA. CONTAMINATION CAN OCCUR IF YOU DO NOT DRAIN THE SYSTEM REGULARLY. CONTAMINATION IN THE WATER CAN CAUSE ILLNESS TO PERSONS THAT DRINK THE WATER.
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WATER STORAGE AND DISTRIBUTION -OPERATION -DRAIN

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WATER STORAGE AND DISTRIBUTION -OPERATION -DRAIN

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WATER HEATING -INTRODUCTION

Purpose
The lavatory water heaters heats water for use in the lavatory sink.
Physical Description
The water heater is a cylindrical tank assembly of 2.0 quarts
(1.89 L) capacity. The water heater has these components:
*
Lid

*
Indicator light

*
Power switch

*
Pressure relief valve

*
Water outlet

*
Tank

*
Heater element (3) (internal)

*
Temperature sensor (internal)

*
Printed Circuit (PC) card (internal)

*
Cold/hot water mixing/bypass device (internal)

*
Water inlet

*
Temperature selection switch

*
Overheat switch and reset button

*
Electrical connector.

The power switch has two positions, ON and OFF. The temperature selector has these positions and approximate water temperature:
*
Low (105F, 40.6C)

*
Medium (115F, 46C)
　
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