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 B.  The forward No. 1 windshield and the No. 2 sliding window on each side of the cabin have a separate control system for each window (Fig. 2). The control system maintains the respective window at the required temperature by the use of automatic controls. Each system consists of the heated window, a window heat sensor, a control switch, a heat control unit, a power indicating light, and an overheat indicating light. A power and overheat test switch is used in common with all four systems. The No. 4 and 5 windows receive power through the side window heat switch. Power to windows No. 4 and 5 is regulated by a thermal switch located on the No. 5 window. While the system is in operation, the temperature of the windows is regulated at 107 |7°F for the No. 1 and 2 windows and from 80 to 120°F for the No. 4 and 5 windows. The control system turns off the power to the No. 1 and 2 windows when an overheat condition of approximately 145°F is detected.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL 
NO. 4  SEE  A 
NO. 5  NO. 4 
WINDOW  NO. 5 
THERMAL 
SWITCH 

NO. 3 SIDE (UNHEATED)  NO. 2 SIDE  WINDOW HEAT SENSORS  NO. 1 FWD  NO. 2 SIDE WINDOW HEAT SENSORS  NO. 3 SIDE (UNHEATED) 
LEFT HAND WINDOWS  RIGHT HAND WINDOWS 
OVERHEAT A  A OVERHEAT  A OVERHEAT  A OVERHEAT 
ON  G  ON  G  ON  G  ON  G 
OFF SIDE L  FWD  OVHT WINDOW HEAT  FWD  OFF R  SIDE 
ON  PWR TEST  ON 
A 
WINDOW HEAT CONTROL UNITS (4 PLACES) SEE  B  M323 (RIGHT FRONT) M322 (LEFT SIDE) M321 (LEFT FRONT) M320 (RIGHT SIDE)  DISCONNECT PANEL 

E3-3 ELECTRICAL 
SHELF  FWD  TERMINAL STRIP 
(4 PLACES) 
B 

Control Cabin Window Anti-Icing System Equipment Location
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C.  When the system is first energized, a ramp function in the heat control unit causes the power delivered to the No. 1 and No. 2 windows to increase gradually from zero to full power in approximately 3 minutes, unless it is controlled at a lesser level by the window reaching control temperature before the ramp time runs out. This reduces the thermal shock to the pane when the power is applied to a cold window. A power interruption of five seconds or more will cause the ramp function to start over from zero, while for lesser interruptions, the ramp will start over a fraction that is proportional to the time off. The window heat sensor provides a temperature control signal to the heat control unit which in turn modulates the amount of power to the window to maintain the window at the required operating temperature. The power indicating light will be on when power is being supplied to the window. If an overheat condition is detected, the heat control unit will cut off power to the windows, turn off the power indicating light, and turn on the overheat indicating light and the master caution and anti-ice lights of the master caution system (Ref Chapter 33, Master Warning and Caution Lights). While the system is in operation, the heat control unit may be functionally tested by the use of the system test switch. Holding the test switch in the POWER position will force the control unit to supply power to the window and turn on the power indicating light. If the operational confidence check is performed under conditions where the window temperature is within the overheat cutoff range, whether by outside environment or by excessively long testing, an overheat cutoff will occur. An overheat condition can be simulated by holding the test switch in the OVERHEAT position. The system is returned to normal by momentarily placing the control switch in the OFF position. The temperature of the No. 4 and 5 windows is controlled by the thermal switch on the No. 5 window.
 2.  Window Conductive Coating_________________________
　
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