S 434-010

 (2)  
Tighten the B-nut.

 S 434-011

 (3)  
Install the electrical connector.

 S 614-004

 (4)
Do this task: "Water System Servicing (Fill)" (AMM 12-14-01/301).

 S 864-012

 (5)  
Supply electrical power (AMM 24-22-00/201).

 S 864-013

 (6)  
Do this task: "Pressurize Water System" (AMM 38-15-00/201).

 S 794-005

 (7)  
Make sure that there are no leaks in the water lines that you opened.

 S 864-017

 (8)  
Close these circuit breakers:

 (a)  P414, Left Power Distribution Center
 1) 414A24, WASTE & WATER LINE HTR MN PWR
 2) 414D5, WASTE & WATER LINE HTR MN PWR

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747-400 MAINTENANCE MANUAL
 S 714-014
 (9)  
Do a test of the in-line heater (AMM 30-71-00/501).

 S 414-015

 (10)
 Install the cargo liners or floor panels which you removed (AMM 25-52-01/401).

 S 114-006

 (11)
 Do this task:  "Potable Water System Cleaning (with Disinfectant)" (AMM 38-10-00/201).

 S 864-016

 (12)
 Remove electrical power (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 POTABLE WATER TANK HEATERS AND THERMOSTATS - REMOVAL/INSTALLATION
_________________________________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)
A removal and the installation of the potable water tank heater.

 (2)
A removal and installation of the tank heater thermostat.

 B.  It is necessary to drain the potable water system before you can replace the tank heater or thermostat.
 TASK 30-71-08-004-001
 2.  Potable Water Tank Heater Removal (Fig. 401)_________________________________
 A.  References
 (1)  
AMM 12-14-01/301, Water System Servicing

 (2)  
AMM 25-52-01/401, Containerized Cargo Comparment Ceiling and Sidewall Lining

 (3)  
SSM 30-71-01, SSM 30-71-02, SSM 30-71-03

 (4)  
WDM 30-71-11, WDM 30-71-12, WDM 30-71-13, WDM 30-71-14

 B.  Access
 (1)  Location Zone 125 thru 152 Lower Lobe (Refer to WDM for heater locations)
 C.  Procedure
 S 864-002
 (1) Open these circuit breakers and install DO-NOT-CLOSE tags:
 (a)  P414, Left Power Distribution Center 1) 414A23, WATER TANK HTR B 2) 414D4, WATER TANK HTR A
 S 684-003
 (2)  Do this task: "Water System Servicing (Drain)" (AMM 12-14-01/301).
 NOTE: Make sure that you release the pressure in the water system.
____
 S 014-004
 (3)  
Remove the cargo liners or floor panels as necessary to get access the potable water tank.

 (4)
Disconnect the electrical connector from the tank heater.

 (5)  
Unscrew the heater and remove it from the tank.

 (6)  
Remove the O-ring from the heater for re-use.

 S 034-005
 S 034-006
 S 024-008
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