C.  References
 (1)  
AMM 12-14-00/301, Water Servicing

 (2)  
AMM 38-41-00/201, Water Tank Pressurization

 D.  Procedure - Pressure Drain the Potable Water System
 S 863-002
 (1)  Open the WATER HEATER circuit breakers on the P18 panel and attach DO-NOT-CLOSE tags.
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 S 863-003
 (2)  Pressurize the water system (AMM 38-41-00/201).
 S 863-004
 (3)  Turn the drain valve handle found at the service panel to open the
 water drain valve.
 S 863-051
 (4)  ALL EXCEPT LAVATORIES D AND E;
 open the sink cabinet door and turn the drain valve handle to DRAIN.
 NOTE:____ the drain valves in lavatories D and E must not be moved from
 their normal (SUPPLY/DRAIN or ON) positions for this
 procedure.

 S 863-073
 (5)  
Set the secondary drain valve handle to DRAIN and then turn the drain valve handle to DRAIN.

 S 863-026

 (6)  
In each galley with a faucet installed, open the faucet.

 S 863-011

 (7)  
When the water flow from the drain outlets stop, close the tank drain valve.

 S 863-027

 (8)  
In each galley with a faucet installed, close the faucet.

 S 863-052

 (9)  
ALL EXCEPT LAVATORIES D AND E; turn the drain valve handles to SUPPLY or ON as applicable.

 S 863-074

 (10)
 Shut the secondary drain valve and then turn the water valve handle to SUPPLY or ON as applicable.

 S 683-053

 (11)
 ALL EXCEPT LAVATORIES D AND E; after two minutes, turn the drain valve handle to DRAIN to exhaust the remaining water.

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A 737-300/400/500MAINTENANCE MANUAL
 S 863-075
 (12)
 Set the secondary drain valve handle to DRAIN and then turn the drain valve handle to DRAIN to exhaust the water that remains.

 S 863-054

 (13)
 ALL EXCEPT LAVATORIES D AND E; when the water flow stops, turn the drain valve handle to SUPPLY or ON as applicable.

 S 863-076

 (14)
 Shut the secondary drain valve and then turn the water valve handle to SUPPLY or ON as applicable.

 S 863-015

 (15)
 In each lavatory allow 2 minutes for the pressure to become stable.

 S 863-016

 (16)
 Open each lavatory water faucet for 1/2 minute, then close the water faucet.

 S 863-058

 (17)
 In the galleys with the water boiler and/or coffeemaker installed, move the switches for the water boilers and coffeemakers to the OFF position.

 S 863-017

 (18)
 In each galley, allow 2 minutes for the pressure to become stable.

 S 683-018

 (19)
 Drain the water from the water boilers and coffeemakers.

 S 863-023

 (20)
 Depressurize the water tank (AMM 38-41-00/201).

 S 683-024

 (21)
 In the galleys that have a water filter that is installed below the level of the lowest water outlet, drain the water filter.

 E. Procedure - Gravity Drain the Potable Water System
 S 863-025
 (1)  
Open the circuit breakers for the lavatory water heaters on the P18 panel and attach DO-NOT-CLOSE tags.

 (2)  
Open the fill and overflow valve and the tank drain valve.

 S 863-030
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