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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-004
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - GENERAL DESCRIPTION
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - GENERAL DESCRIPTION
EFFECTIVITY
GUN 201-999 30-41-00
Page 16
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-004
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 control
circuits keep K1 energized. This 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. The
control circuits energizes K2, this keeps the amber P5 overhead
panel OVERHEAT light off.
As the window gets near its target temperature of 110F (43C),
the WHCU ramps down electric current to the window. This
prevents temperature overshoot.
GUN 001-099, 101-118
When there is current flow to the window, the power demand
detector in the WHCU energizes the green ON light circuit. The
ON light on P5-9 panel comes on. This gives an indication that
the window heat circuit is active.
GUN 201-999
When there is current flow to the window, the power demand
detector in the WHCU energizes K3 and the amber OFF light on
P5-9 panel goes out. This gives an indication that the window
heat circuit is active.
GUN ALL
If the window is warmer than the target temperature when the
system switch is ON, these things are true:
* Window heat is not necessary
* The WHCU does not send current to the window
GUN 001-099, 101-118
* The green ON light on P5-9 panel comes on.
GUN 201-999
* The amber OFF light on P5-9 panel comes on.
GUN ALL
Overheat Protection
The WHCUs have overheat protection circuitry.
If the WHCU detects both of these conditions, an overheat trip
occurs:
* Window temperature more than 145F (62C)
* Electric current to the window heat circuit.
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-41-00
Page 17
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-009
The overheat protection circuit operates only while power is
applied to the window. When an overheat condition is sensed
K1 and K2 are relaxed. This removes power from the window.
This also provides a ground for the amber OVERHEAT light on
P5-9 panel.
An overheat trip causes these things to happen:
* Electric current to the window is off
GUN 001-099, 101-118
* The green ON light on P5-9 panel goes out.
GUN 201-999
* The amber OFF light on P5-9 panel comes on.
GUN ALL
* The amber OVERHEAT light on P5-9 panel comes on.
* The MASTER CAUTION and ANTI-ICE annunciator lights
come on.
To reset the system, move the WINDOW HEAT switch to the OFF
position, and then back to the ON position.
An overheat cannot be reset until the window cools.
GUN 201-999
On the ground, the MASTER CAUTION and ANTI-ICE
annunciator lights are inhibited for the amber OFF light when
left engine throttle is retarded.
GUN ALL
Training Information Point
There are two temperature sensors in each window:
* Primary sensor
* Spare sensor.
If the primary sensor fails, you can use the spare sensor. This
prevents the need to change a window if the primary sensor
fails.
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-41-00
Page 18
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-009
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - FUNCTIONAL DESCRIPTION
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-118 30-41-00
Page 19
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-009
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - FUNCTIONAL DESCRIPTION
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