(2)  
24-22-00/201, Electrical Power

 C.  Access
 (1)  Location Zones
 107 Forward Half of Cabin
 210 Air Conditioning Distribution Bay

 D.  Procedure
 S 434-009
 (1)  
FOR THE 250°F (121°C) OVERHEAT SWITCH;
 Connect the electrical connector to the switch.

 S 434-010

 (2)  
FOR THE 190°F (88°C) OVERHEAT SWITCH; Make the wires which connect to the switch into a splice.

 S 714-022

 (3)  
Do a test of the duct overheat switch:

 (a)  
Supply electrical power (Ref 24-22-00/201).

 (b)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 1)  P6-4 panel
 a) OVERHEAT

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A

737-300/400/500MAINTENANCE MANUAL
OVERHEAD DISTRIBUTION DUCT
SEE A
MAIN
DISTRIBUTION
MANIFOLD
SEE E
AIRPLANES WITH OVAL OVERHEAD DISTRIBUTION DUCTS
OVERHEAD DISTRIBUTION DUCT
SEE C
MAIN DISTRIBUTION MANIFOLD
SEEE
AIRPLANES WITH ROUND OVERHEAD DISTRIBUTION DUCTS

Duct Overheat Switches Installation
Figure 401 (Sheet 1)

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G94314
A 737-300/400/500MAINTENANCE MANUAL
190`F
OVERHEAT
SWITCH

SEE B
SCREW (3 LOCATIONS)
SCREW (3 LOCATIONS)
250`F 250`F OVERHEAT OVERHEAT SWITCH
FWD SWITCH
SEE B
FWD
OVERHEAD DISTRIBUTION DUCT
A
ELECTRICAL 190`F CONNECTOR OVERHEAT SWITCH
SPLICE
OVERHEAT SWITCHES
250`F OVERHEAT
B
SWITCH
SEE D
190`F OVERHEAT SWITCH
SEE D  SCREW (3 LOCATIONS)
FWD
DISTRIBUTION
DUCT

SWITCH ELECTRICAL
OVERHEAD DISTRIBUTION DUCT
CONECTOR
C OVERHEAT SWITCH
D
Duct Overheat Switch Installation
Figure 401 (Sheet 2)

G94325
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A 737-300/400/500MAINTENANCE MANUAL

MAIN DISTRIBUTION MANIFOLD

SWITCH

FWD
DUCT OVERHEAT SWITCHES

Duct Overheat Switches Installation
Figure 401 (Sheet 3)

G94337
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A 
737-300/400/500MAINTENANCE MANUAL
 (c)  FOR THE 190°F (88°C) OVERHEAT SWITCH;
 Push the DUCT OVERHEAT light momentarily on the P5-10 air
 conditioning module and make sure the light comes on.
 (d)  FOR THE 250°F (88°C) OVERHEAT SWITCH;
 Push the PACK TRIP OFF light momentarily on the P5-10 air
 conditioning module and make sure the light comes on.
 (e)  Disconnect the electrical connector, D486, from the left pack
 valve.
 (f)  Do a test of the 190°F (88°C) duct overheat switch:
 1) Push the applicable DUCT OVERHEAT light on the P5-10 air
 conditioning control module.
　
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