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 A.  The control cabin windows are of laminated glass-vinyl construction. Refer to Chapter 56, Control Cabin Windows, for details of window construction. The No. 1 and 2 windows have a conductive coating between the outer glass panes and vinyl core where it is most effective for window anti-icing, whereas the No. 4 and 5 windows have the conductive coating between the inner glass pane and the vinyl core where it will be most effective for window defogging. All four windows have electrical terminals connected to bus bars which are molded into the upper and lower edges of the window in contact with the conductive coating. The windows are heated by allowing current to flow through the conductive coating between the upper and lower bus bars. The resistance of the conductive coating increases with age and higher voltages are required across the bus bars to maintain equivalent heat output.
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P5-9 WINDOW AND PITOT HEAT PANEL
NOTE: LEFT SIDE SHOWN,RIGHT SIDE SIMILAR
Window Anti-Icing System SchematicFigure 2 (Sheet 1)
A 737-300/400/500MAINTENANCE MANUAL A 737-300/400/500MAINTENANCE MANUAL

P5-9 WINDOW AND PITOT HEAT PANEL M322 LEFT SIDE WINDOW HEAT CONTROL UNIT (E3-3) A13 LEFT SIDE WINDOW NO.2LEFT SIDE SHOWN,RIGHT SIDE SIMILAR
Window Anti-Icing System Schematic
Figure 2 (Sheet 2)

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A 737-300/400/500MAINTENANCE MANUAL

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 3.  Window Heat Sensor
__________________
 A.  The No. 1 and 2 windows each have a heat sensor consisting of a filament of noninsulated resistance wire. The wire is arranged in a single plane coil and imbeded in a thin plastic wafer installed near the lower edge of the window (Fig. 1 and 2) between the outer pane and plastic core. The resistance of the wire is sensitive to temperature and increases as the temperature increases. A change in window temperature causes a change in sensor resistance, providing a signal for the heat control unit. No. 1 and 2 windows have a spare heat sensor mounted adjacent to the primary heat sensor. If the primary sensor fails, the spare sensor may be used.
 4.  Control Switches
________________
 A.  There are four window heat control switches, one for each of the No. 1 and 2 windows on each side of the cabin. The switches are four-pole two position ON-OFF toggle switches and are on the overhead panel. The No. 4 and 5 windows are controlled by the respective left or right side window heat switch (Fig. 1 and 2).
 5.  Control Unit
____________
 A.  There are four window heat control units, one for each of the window No. 1 and 2 heating systems. The units are located in the E3-3 electrical rack (Fig. 1 and 2).
 B.  The temperature control unit is a solid state device which performs three functions: overheat control, temperature control including ramp control and shorted sensor protection, and power indication.
 C.  The control unit overheat circuit, when energized, directs 115-volt ac power from the window anti-ice circuit breaker to the control unit temperature control circuit.
　
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