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 B.  From the reservoir connection, a teflon supply line is routed below the control cabin floor to a stainless steel T-connection mounted forward of the windshield. The T is connected by stainless steel tubing to a solenoid control valve for each window.
Solenoid and Spray Nozzles
__________________________
 A.  The solenoid valves are normally closed electrically operated 28 volt dc valves (Fig. 2). The valves control the flow of repellent fluid released to the spray nozzles and are coupled directly to the nozzles.
 B.  The spray nozzles are mounted externally at the base of each No. 1 window inboard of the windshield wiper drive shaft (Fig. 1). Each nozzle has four spray holes which direct the repellent fluid onto the windshield.
Time Delay Module
_________________
 A.  Each solenoid valve is controlled by an independent electrical control circuit (Fig. 2). The electrical control components of each circuit consist of a system control switch and a time delay circuit. The control switches are pushbutton type momentary switches and are located on the overhead panel. The time delay circuit is mounted within the delay module which is connected to the solenoid valve electrical connector. A resistor in the time delay circuit is variable and may be adjusted to change the time required to charge a capacitor and thus control the time delay action. The delay is adjusted to open the circuit to the solenoid valve after the required amount of repellent has been sprayed on the window, allowing the valve to close.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
AT
F
S24
CALL

RAIN REPELLENTGEN 2
LR
PRESS
S23
WIPER
PARK

OFFLOW
STA
28V DC190
BUS 2 C57
REF
RIGHT RAIN
REPELLENT

S24 RIGHT RAIN
REPELLENT
SWITCH

RAIN REPELLENTFLUID SUPPLY LINE CONTAINER
RESERVOIR REPELLENTREPELLENTTIME DELAY VALVE
M576 RIGHT RAIN V2RIGHT RAIN
CONTAINER
(STA 186)
CLAMP
28V DC
BUS 1

CONTAINERC56 RECEPTACLE
LEFT RAIN SHUTOFF VALVE
REPELLENT S23 LEFT RAIN
REPELLENT
SWITCH

CANP18-3 CIRCUIT BREAKER P5 OVERHEAD PANEL -
REPLACEMENT
RESERVOIR
NOZZLE
LEVEL
PANEL  FORWARD
M575  LEFT RAIN V1 LEFT RAINREPELLENTREPELLENTTIME DELAY VALVESOLENOID
(STA 186) VALVE
SHUT-OFF VALVE, VISUAL RESERVOIR,RAIN REPELLENT CONTAINER (STA 259)
ACCESS HOLE
RAIN REPELLENTFLUID SUPPLY LINERAIN REPELLENT VALVE AND NOZZLE (TYPICAL)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
Rain Repellent System Schematic
Figure 2

A 737-300/400/500MAINTENANCE MANUAL
 6.  Operation
_________
 A.  With the pressurized fluid container installed in the system receptacle, the shutoff valve in the open position, and 28-volt dc power available on the No. 1 and No. 2 dc bus, the system is ready for use. The operation of the rain repellent system for each window is individually controlled by pushing the respective control switch (Fig. 2). Pushing the control switch completes a circuit from the respective RAIN REPELLENT circuit breaker through the switch and time delay circuit, to energize the respective control valve solenoid. Actuation of the solenoid valve allows the pressurized reservoir to supply rain repellent through the tubing to the spray nozzles and onto the window. When the required amount of repellent has been sprayed on the window, the time delay circuit will operate to break the circuit, de-energizing the solenoid valve and preventing further flow of repellent solution. Releasing the control switch breaks the circuit to the relay coil, de-energizing the relay and closing the relay points for the next operation. The pressurized fluid container will replenish the fluid in the reservoir as the fluid level drops and the pressure is decreased.
 B.  When actuating the control switch, hold the switch depressed until fluid stops flowing from the nozzle. Rapid actuations of the control switch (less than 0.2 seconds) may de-energize the solenoid valve before the time delay relay operates, releasing less than the normal amount of fluid.
　
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