S 485-058
(2)
Connect an AC voltmeter between terminal A of the left No. 5 window thermostat and ground.
S 735-059
(3)
Do a check of the left side window heat operation:
(a)
Set the WINDOW HEAT L SIDE switch to on. 1) BEJ B-2531, B-2532; Make sure that the voltmeter shows 65 |15 volts ac.
2) BEJ B-2535 AND ON; Make sure that the voltmeter shows 115 |15 V ac.
(b)
Let the window continue to heat.
(c)
Make sure that the voltmeter shows approximately 0 V ac when the thermal switch opens.
NOTE: The approximate time for the thermal switch to open is:
____ 15 minutes at 70° F ambient temperature, 25 minutes at 50° F ambient temperature, 40 minutes at 30° F ambient temperature.
(d) Measure the temperature of the window (this step is optional):
NOTE: Measure the temperature on the inside of the window
____ immediately adjacent to the thermal switch.
1) Make sure that the window temperature stays in this range: 90° |10° F to 110° |10° F (thermal switch P/N 10-1468) or 75° |10° F to 95° |10° F (thermal switch P/N 10-1468-5).
NOTE: Under cold ambient conditions, it is possible that
____ the window temperature will be as high as 125 |1° F before the thermal switch opens. Under hot ambient conditions, it is possible that the window temperature will be as low as 65° F before the thermal switch closes.
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737-300/400/500MAINTENANCE MANUAL
(e) Set the WINDOW HEAT L SIDE switch to off.
S 085-017
(4)
Remove the voltmeter from the thermal switch.
S 485-044
(5)
Connect an AC voltmeter between terminal A of the right No. 5 window thermostat and ground.
S 735-045
(6)
Do a check of the right side window heat operation:
(a)
Set the WINDOW HEAT R SIDE switch to ON. 1) BEJ B-2531, B-2532; Make sure that the voltmeter shows 65 |15 volts ac.
2) BEJ B-2535 AND ON; Make sure that the voltmeter shows 115 |15 V ac.
(b)
Let the window continue to heat.
(c)
Make sure that the voltmeter shows approximately 0 V ac when the thermal switch opens.
NOTE: The approximate time for the thermal switch to open is:
____ 15 minutes at 70° F ambient temperature, 25 minutes at 50° F ambient temperature, 40 minutes at 30° F ambient temperature.
(d) Measure the temperature of the window (this step is optional):
NOTE: Measure the temperature on the inside of the window
____ immediately adjacent to the thermal switch.
1) Make sure that the window temperature stays in this range: 90° |10° F to 110° |10° F (thermal switch P/N 10-1468) or 75° |10° F to 95° |10° F (thermal switch P/N 10-1468-5).
NOTE: Under cold ambient conditions, it is possible that
____ the window temperature will be as high as 125 |1° F before the thermal switch opens. Under hot ambient conditions, it is possible that the window temperature will be as low as 65° F before the thermal switch closes.
(e) Set the WINDOW HEAT R SIDE switch to OFF.
S 085-046
(7) Remove the voltmeter from the thermal switch.
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A 737-300/400/500MAINTENANCE MANUAL
(8) S 865-018Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P6 Panel 1) WINDOW ANTI-ICE LEFT FRONT 2) WINDOW ANTI-ICE RIGHT FRONT 3) WINDOW ANTI-ICE LEFT SIDE 4) WINDOW ANTI-ICE RIGHT SIDE
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