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to one window.
The WHCUs get 28v dc and 115v ac for control and indication of
window heat to the No.1 and No. 2 windows.
WHCU output power goes to a variable voltage terminal strip.
Power to the window is off of the terminal that best matches the
window power requirements. This is a function of window size
and the condition of its conductive layer.
Training Information Point
CAUTION: DO NOT TOUCH THE WINDOW HEAT CONTROL
UNIT BEFORE YOU DO THE PROCEDURE FOR
DEVICES THAT ARE SENSITIVE TO
ELECTROSTATIC DISCHARGE. ELECTROSTATIC
DISCHARGE CAN CAUSE DAMAGE TO THE
WINDOW HEAT CONTROL UNIT.
The WHCUs have front face BITE that isolates system faults to
the LRU interface level.
For the front windows, you do a test of the resistance of the
sensors with the windshield sensor switches on the forward
outboard E4 stanchion rack.
For more information on the engine test connector see the
FADEC system (SECTION 73-21).
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT
EFFECTIVITY
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ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT
EFFECTIVITY
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Purpose
The window heat terminal connections provide a selection of
voltages from an auto transformer in the window heat control
unit (WHCU) to match the resistance of the window conductive
coating.
Location
The window heat terminal connections are behind the window
heat control units in the EE compartment. You get access to the
connections through access panels in the forward cargo
compartment.
Physical Description
The window heat terminal connections consist of taps on the
terminal blocks. On No. 1 windows, five taps are used. On No. 2
windows, six taps are used.
Training Information Point
When a window is replaced, the new window has the resistance
identified by a code etched in the windshield glass. The code
tells you the proper transformer tap. If the window does not heat
properly, check the conductive coating resistance and select the
proper transformer tap.
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT TERMINAL CONNECTIONS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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30-41-00-007
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT TERMINAL CONNECTIONS
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT TERMINAL CONNECTIONS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-007
General
The window heat control units heat these windows:
* 1L
* 2L
* 1R
* 2R.
These systems use 28v dc for indication and control. The
systems use 115v ac for window heat power.
The window and pitot heat control panel P5-9 has switches and
lights for system control and indication. The window heat
switches control the WHCUs and the window heat systems.
Each WHCU controls electric heat to one window.
The WHCUs monitor window temperatures and heat windows
with electric current when the window is cold.
Power output from the WHCUs is off variable voltage terminal
strips. This matches WHCU output voltage to each window
power requirements.
The windows are of laminate construction, and have a layer of
conductive paste. Bus bars on the windows connect the
conductive layer to airplane wiring. Electric current heats the
window as it moves through this layer of window structure.
Window Heat Control
When you put the WINDOW HEAT switch in the ON position you
energize the system.
The WHCU monitors the window temperature sensor.
If the window temperature is less than 100F (37C), the WHCU
sends electric current to the window to heat it. The application
of power to the window is by a ramp function to prevent thermal
shock to the window.
As the window gets near its target temperature (110F (43C)
nominal), the WHCU ramps down electric current to the window.
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