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ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW HEAT CONTROL UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 201-999 30-41-00
Page 20
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-009
Purpose
Thermal switches on the No. 5 windows control power to the No.
4 and 5 windows.
GUN 201-999
Thermal switches on the No. 3 windows control power to the No.
3 windows.
GUN ALL
General Description
A bracket with a torsional spring secures the switch to the
window.
A conductive paste improves heat transfer from the window to
the switch and prevents a temperature lag between the switch
and the window.
Functional Description
The thermal switch is a normally-closed, single-pole, snap
action bimetallic device. It operates by thermal expansion.
The thermal switches are wired in series with the windows they
control.
Put the related side window heat switch to ON to energize the
system. 115v ac power passes through a thermal switch to the
resistive layer of each window. The resistance of the layer to
the current produces heat and warms the window.
The switch opens at a temperature of 110F (43C) or more. This
opens the circuit, and removes power to the windows.
GUN 201-999
The switch opens at a temperature of 95F (35C) or more. This
opens the circuit, and removes power to the windows.
GUN ALL
When the No. 5 window and thermal switch temperature
decreases to 90F (32C), the switch closes and completes the
heat circuit. This starts the window heat again.
GUN 201-999
When the No. 3 window and thermal switch temperature
decreases to 75F (24C), the switch closes and completes the
heat circuit. This starts the window heat again.
GUN ALL
Training Information Point
These windows are not part of the anti-ice panel indication or
test systems.
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW NO. 5 THERMAL SWITCH
EFFECTIVITY
GUN ALL 30-41-00
Page 21
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-005
These windows do not have overheat protection. If the thermal
switch fails or detaches from its conductive paste, the windows
can overheat. The windows should be warm to the touch, but
not hot. If bubbles appear in the window layers, this may be an
indication of window overheat (thermal breakdown and
outgassing of vinyl layers).
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW NO. 5 THERMAL SWITCH
EFFECTIVITY
GUN ALL 30-41-00
Page 22
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-005
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW NO. 5 THERMAL SWITCH
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW NO. 5 THERMAL SWITCH
EFFECTIVITY
GUN 001-099, 101-118 30-41-00
Page 23
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-005
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW NO. 5 THERMAL SWITCH
ICE AND RAIN PROTECTION - CTRL CABIN - WINDOW NO. 5 THERMAL SWITCH
EFFECTIVITY
GUN 201-999 30-41-00
Page 24
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
30-41-00-005
Purpose
The WHCUs have front face BITE that isolates system faults to
the LRU interface level.
General Description
The BITE circuitry detects failures in these:
* WHCU internal faults
* Window
* Temperature sensor
* Control power input
* Bus power input
* Associated wiring.
The WHCU has a 10-register FAULT HISTORY memory storage
capability.
BITE Test Switches
The WHCU has these switches:
* LAMP TEST
* BIT VERIFY
* FAULT HISTORY
* BIT LAMP RESET.
The LAMP TEST switch does a test of the six BIT indicator
lamps. This verifies power and indication availability.
The BIT VERIFY switch starts a system self test. This does a
check of system faults.
The FAULT HISTORY switch shows the last 10 registers one
register at a time.
The BIT LAMP RESET switch clears the fault from the WHCU.
BITE Indications
The BIT TEST OK lamp shows that a BIT VERIFY test is
complete and found no faults. The lamp stays on for 15 seconds.
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