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3.
4.
5.
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737-300/400/500MAINTENANCE MANUAL
(3)
Passenger Cabin Duct Limit Sensor
(4)
Control Cabin Duct Anticipator
(5) Control Cabin Duct Limit SensorPrepare to Trouble Shoot Temperature Control
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A. Provide electrical power (Ref 24-22-00, MP).
B. Check that all air conditioning circuit breakers on the P6 and P18 panels are in (closed).
C. Check that following circuit breakers on panel P6 are closed.
(1)
MASTER CAUTION (all except FUEL, if installed)
(2)
INDICATOR LTS, MASTER DIM BUS (9 places)
(3)
DIM & TEST (1 place)
D. Move AIR TEMP selector to PASS CABIN, then SUPPLY DUCT positions and check that readings on temperature indicator are approximately the same.
E. Lower the 3303L and 3403R air conditioning access panels.
F. Disconnect electrical connector D486 from the left pack flow control and shutoff valve (FCSOV) and electrical connector D490 from the right pack flow control and shutoff valve in the pack bays.
NOTE: This simulates that the pack FCSOVs are open so that the mix
____
valve can be operated.
G. Move R PACK (L PACK) switch to AUTO or HIGH.
H. Move RECIRC FAN switch to OFF.
I. Check that PACK TRIP OFF and DUCT OVERHEAT lights are off and press-to-test to assure proper light operation.
J. Move temperature selector to MANUAL WARM and check that mix valve moves toward warm by observing mix valve position indicator.
K. If mix valve moves to warm, move selector to MANUAL COOL and check that valve moves back to full cold. If mix valve does not move in response to selector setting, check per trouble shooting chart.
L. If mix valve moves in response to manual temperature selection, or if, after a difficulty has been corrected in manual temperature control system, automatic control still doesn't operate correctly, trouble shoot automatic temperature control system.
Trouble Shooting Automatic Temperature Control System
_____________________________________________________
A. Provide electrical power (Ref 24-22-00, MP) and perform check per
instructions on face of controller.Trouble Shooting Chart
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NO VOLTAGE - Check continuity between C2 of pack valve closed relay and pin 3 of temperature selector switch. Repair or replace wiring.
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737-300/400/500MAINTENANCE MANUAL
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