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* Potable water system service and supply components
* Gray water system drain components
* Vacuum waste system drain and service components.
General
It is important to prevent ice formation in the water and toilet
systems. Ice formation in the systems can cause these
problems:
* Ice expansion damage
* Line blockage that prevents normal system operation
* Line blockage that prevents normal service operations
* Ice formations on the forward drain mast can break off and
damage airplane structure.
The water and toilet drain anti-icing systems use electric power
for heat.
These system components have integral heaters:
* Service panel fittings
* Drain masts
* Hoses with integral heating elements.
Components without integral heaters get heat from these
components:
* Heater tape (ribbon heaters)
* Heater blankets.
Training Information Point
The water and toilet drain anti-icing systems require electric
power.
If you park the airplane in freezing conditions with no electric
power, drain the water and toilet systems to prevent ice
formation.
Pull the circuit breakers for the water tank compressor and
water heaters before you drain the potable water system.
ICE AND RAIN PROTECTION - WATER LINES - INTRODUCTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ICE AND RAIN PROTECTION - WATER LINES - INTRODUCTION
ICE AND RAIN PROTECTION - WATER LINES - INTRODUCTION
EFFECTIVITY
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ICE AND RAIN PROTECTION - WATER LINES - INTRODUCTION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The potable water anti-icing system prevents ice formation in
these areas:
* The potable water fill fitting
* The potable water fill hose
* The potable water supply hoses.
* The potable water main tank heater blanket.
* The potable water auxiliary tank heater blanket.
Potable Water Fill Fitting
The potable water fill fitting has a built in heater element.
The fitting heater uses 28v dc power. A circuit breaker controls
power to the fitting. Heat is constant and automatic when power
is on the airplane.
Potable Water Fill Hose
The potable water fill hose has a built-in heater element.
The hose heater element uses 115v ac power. A circuit breaker
controls power to the hose. Heat is constant and automatic
when power is on the airplane.
Potable Water Supply Hoses
Some of the potable water supply hoses have built-in heater
elements.
The hoses use 115v ac power. Thermostatic switch in the hose
controls heat to the hoses.
Heat to the hoses is automatic when power is on the airplane.
Potable Water Tank Heater Blankets
The potable water tank heater blanket prevents freezing and
provides regulated heat to the bottom of the water storage tanks
within specified temperature limits. Water tank heaters use
electrical power to keep tanks from freezing both in flight and on
the ground.
Location
There are two water tank heaters located aft of the cargo
compartment. You must remove the aft bulkhead cargo linining
to get access to these tank heaters:
* Main potable water tank heater
* Auxiliary potable water tank heater
Physical Description
The water tank heaters consist of these parts:.
* Heater element
* Grommet
* Lacing cord
* Primary thermostat
* Manual reset back up thermostat
ICE AND RAIN PROTECTION - WATER LINES - POTABLE WATER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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A simplified design wrapped around the bottom half of the water
tank with lacing cord to allow easy removal and installation.
Designed with etched foil or wire-wound resistance elements
for dependable heater performance.
The main tank heater consists of a single heater element
wrapped around the lower half of the tank with cutout sections
to mold around the tank attachment mounts.
　
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