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This prevents temperature overshoot.
GUN 001-099, 101-118
When there is current flow to the window, sense circuitry in the
WHCU energizes the P5-9 green ON light circuit. The ON light
comes on. This gives an indication that the window heat circuit
is active.
GUN 201-999
When there is current flow to the window, sense circuitry in the
WHCU deenergizes the P5-9 amber OFF light circuit. This gives
an indication that the window heat circuit is active.
GUN ALL
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-41-00
Page 12
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-004
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 P5-9 green ON light is off.
GUN 201-999
* The P5-9 amber OFF light is on.
GUN 001-099, 101-118
A PWR TEST switch on the P5 overhead panel gives the crew a
confidence test of the window heat system when the window is
warm. The switch does a test of all the WHCU window heat
systems that are ON. Hold the switch to the PWR TEST position
to do the test. This causes the WHCU to send current to the
window and the green P5 overhead panel ON light comes on.
Release the PWR TEST switch as soon as you verify the green
ON light, or you can overheat the window. This will cause the
WHCU overheat protection circuitry to activate.
GUN 201-999
A PWR TEST switch on the P5-9 panel gives the crew a
confidence test of the window heat system when the window is
warm. The switch does a test of all the WHCU window heat
systems that are on. Hold the switch to the PWR TEST position
to do the test. This causes the WHCU to send current to the
window, and the P5-9 amber OFF light goes off.
Release the PWR TEST switch as soon as you verify the amber
OFF light, or you can overheat the window. This will cause the
WHCU overheat protection circuitry to activate.
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.
The overheat protection circuit operates only while power is
applied to the window. This permits a lower overheat trip
setting, and prevents nuisance system trips during operations
under conditions of high ambient heat.
An overheat trip causes these things to happen:
* Electric current to the window is cut off
GUN 001-099, 101-118
* The green P5-9 green ON light goes out
GUN 201-999
* The amber P5-9 amber OFF light comes on
GUN ALL
* The amber P5-9 amber OVERHEAT light comes on
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-41-00
Page 13
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-004
* The MASTER CAUTION and ANTI-ICE annunciator lights
come on.
To reset the system, you must 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.
An OVHT switch on the P5-9 panel panel gives the crew a
confidence test of the WHCU overheat protection circuitry
during system operation. The switch does a test of all the WHCU
window heat systems that are switched ON. Hold the switch to
the OVHT position for one second then release to do the test.
This causes the WHCU circuitry to simulate a window overheat.
The indications of a successful test are the same as an actual
overheat condition. To reset the system, move the window heat
switch to the OFF position, and then back to the ON position.
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 30-41-00
Page 14
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
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 001-099, 101-118 30-41-00
Page 15
D633A101-GUN Oct 10/2006
　
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