S 864-011

 (3)
Remove the DO-NOT-CLOSE tags and 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

 S 714-012
 (4)  
Do a test of the heater which the thermostat controls (AMM
 30-71-00/501).

 (5)  
Install the floor panels which you removed for access.

 S 414-013
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747-400 MAINTENANCE MANUAL
 IN-LINE HEATERS - REMOVAL/INSTALLATION
______________________________________
 1.  General_______
 A.  This subject has two tasks, one for the removal and one for the installation of the in-line water supply line heaters. In this procedure, you will get access to the heater, loosen and remove the heater, and install a replacement unit.
 B.  It is necessary to drain the potable water system before you replace an in-line heater.
 TASK 30-71-07-004-001
 2.  In-Line Heater Removal (Fig. 401)______________________
 A.  References
 (1)
AMM 12-14-01/301, Water System Servicing

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

 (3)
SSM 30-71-01

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

EXAMPLE IN-LINE HEATER INSTALLATION

In-Line Heater Installation
Figure 401

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747-400
MAINTENANCE MANUAL

 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:
 (a)  P414, Left Power Distribution Center 1) 414A24, WASTE & WATER LINE HTR MN PWR 2) 414D5, WASTE & WATER LINE HTR MN PWR
 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 access the in-line heater (AMM 25-52-01/401).

 S 034-005

 (4)
Disconnect the electrical connector from the in-line heater.

 S 034-006

 (5)  
Loosen the B-nut on the in-line heater.

 S 024-007

 (6)  
Pull the in-line heater out of the water line.

 TASK 30-71-07-404-008
 3. In-Line 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, Water Line and Waste Drain Heaters

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A
747-400
MAINTENANCE MANUAL

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

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

 (7)  
AIPC 30-71-07, Fig. 1

 (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)
　
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