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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | PROBLEM | POSSIBLE CAUSE | ISOLATION PROCEDURE | CORRECTIVE PROCEDURE| ................................................................................ | | | | 4) Turn the heater| | | | | power on.| | | | | 5) If the lights do| | | | | not come on, or| | | | | if the overheat| | | | | switch(s) open| | | | | again (lights go| | | | | off), continue| | | | | the trouble| | | | | shooting| | | | | procedure.| | | | | | | | | If the bulb does not | Replace the overheat| | | | come on, servicing of | switch if necessary.| | | | the switch is| | | | | necessary.| | | | | | | | | | If bulb comes on, | Replace the cycling| | | | operate heater for five | switch if necessary.| | | | minutes and then| | | | | examine the water| | | | | temperature.| | | | | | | | | | If the water temperature| | | | | is above 125°F, servicing| | | | | of the cycling switch is| | | | | necessary.| | | | | | | | The heater | The cycling | Do a check for continuity| | | switch is | switch does not| through the cycling| | | ON, the | close. | switch.| | | light comes| | | | | on, but | | NOTE:
____The water| | | there is no| | temperature must| | | hot water. | | be below 94°F.| | | | | | | | | | If there is no continuity| Replace the cycling| | | | through the cycling | switch if necessary.| | | | switch, servicing of the| | | | | switch is necessary.| | | | | | | | | Immersion | If the cycling switch | Replace the| | | heater(s) | operates, servicing one | immersion heater(s)| | | | or more immersion | as necessary| | | | heaters is necessary.| | | | | | | 2............…................…..........................….....................1
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 38-11-61
 ALL  ú ú 01 Page 102 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 WATER HEATER - REMOVAL/INSTALLATION
___________________________________
 1. General
_______
 A. This procedure includes two tasks:
 (1)  
The removal of the water heater

 (2)  
The installation of the water heater

 TASK 38-11-61-004-001
 2. Water Heater Removal (Fig. 401)
____________________
 A. Access
 (1)  Location Zones
 103 Forward Lavatory
 113/114 Aft Lavatory
 118 Lavatory (if installed)

 B. Prepare for the Removal
 S 864-002
 (1)  
Open the applicable LAVATORY WATER HEATER circuit breaker on the P18-4 panel and attach a DO-NOT-CLOSE tag.

 S 014-003

 (2)  
Open the door for the sink cabinet.

 S 864-005

 (3)
Turn the switch for the water heater to the off position.

 S 034-006

 (4)  
Disconnect the electrical connector from the compartment wall.

 S 864-007

 (5)  
Turn the lavatory drain valve to the OFF position.

 C. Remove the Water Heater
 S 034-009
 (1) Disconnect the inlet and outlet tubes from the water heater.
 NOTE: You must use a container to catch the water when you
____
 disconnect the water lines.

 S 494-008
 (2)  
Install a cover on the inlet and the outlet tube end to keep out unwanted material.

 (3)  
Disconnect the attach clamp.

 S 034-011
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 38-11-61
 ALL  ú ú 01 Page 401 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SINK PIPING
　
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