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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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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