Potable Water Tank Heater
Figure 401

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E49496
A
747-400
MAINTENANCE MANUAL

 TASK 30-71-08-404-007
 3. Potable Water Tank Heater Installation (Fig. 401)
______________________________________
 A. References
 (1)  
AMM 12-14-01/301, Water System Servicing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Lining

 (4)  
AMM 30-71-00/501, Waterline and Waste Drain Heaters

 (5)  
AMM 38-10-00/201, Potable Water System

 (6)  
AMM 38-15-00/201, Water System Pressurization

 (7)  
AIPC 30-71-07

 (8)  
SSM 30-71-01, SSM 30-71-02, SSM 30-71-03

 (9)  
WDM 30-71-11, WDM 30-71-12, WDM 30-71-13, WDM 30-71-14, WDM 30-71-15

 B. Access
 (1)  Location Zone 125 thru 152 Lower Lobe (Refer to WDM for heater locations)
 C. Procedure
 S 424-009
 (1)  
Put the O-ring on the heater.

 S 424-010

 (2)  
Put the heater into the tank, and tighten.

 S 434-011

 (3)  
Install the electrical connector.

 S 614-012

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

 S 864-013

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

 S 864-014

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

 (7)  
Make sure that there are no leaks at the tank heater.

 S 864-016

 (8)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 S 794-015
 (a)  P414, Left Power Distribution Center
 1) 414A23, WATER LINE HTR B
 2) 414D4, WATER LINE HTR A

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747-400 MAINTENANCE MANUAL
 S 714-017
 (9)  
Do a test of the tank heater (AMM 30-71-00/501).

 S 414-018

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

 S 114-019

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

 S 864-020

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

 TASK 30-71-08-004-028
 4.  Potable Water Tank Thermostat 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)  
WDM 30-71-11, WDM 30-71-12, WDM 30-71-13, WDM 30-71-14

 (4)  
SSM 30-71-01, SSM 30-71-02, SSM 30-71-03

 B. Access
 (1)  Location Zone 125 thru 152 Lower Lobe (Refer to WDM for heater locations)
 C. Procedure
 S 864-022
 (1)
Open these circuit breakers an install DO-NOT-CLOSE tags:

 (a)  P414, Left Power Distribution Center 1) 414A23, WATER TANK HTR B 2) 414D4, WATER TANK HTR A

 (2)  
Do this task: "Water System Servicing (Drain)" (AMM 12-14-01/301).

 S 684-023
 NOTE: Make sure that you release the pressure in the water system.
____
 S 014-024
 (3)  Remove the cargo liners or floor panels as necessary to get access the potable water tank.
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