21-58-91
 ú ú 01 Page 203 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 862-012
 (2)  
Supply electrical power (Ref 24-22-00/201).

 S 862-013

 (3)  
Put the EQUIP COOLING SUPPLY switch to NORMAL or ALTERNATE on the P5 overhead panel for the applicable check valve.

 S 712-020
 CAUTION:_______MAKE SURE THE "EQUIP COOLING SUPPLY OFF" LIGHT STAYS OFF. IF THE LIGHT COMES ON, EXAMINE THE CHECK VALVE AND THE DUCT TO BE SURE THAT THEY ARE ALIGNED . IF THEY ARE NOT ALIGNED CORRECTLY, THE CHECK VALVE FLAPPER CAN GET CAUGHT. THIS WILL CAUSE THE AIRFLOW TO GO THROUGH THE ALTERNATE FAN WHICH WILL DECREASE THE AIRFLOW TO THE LOW FLOW DETECTOR.
 (4)  
Make sure the applicable fan operates and the EQUIP COOLING SUPPLY OFF light stays off.

 S 862-015

 (5)  
Remove the electrical power, if it is not necessary
 (Ref 24-22-00/201).

 TASK 21-58-91-102-016
 4.  EFIS Cooling Check Valves - Cleaning____________________________________
 A. Standard Tools and Equipment
 (1)  
Brush - soft-bristle

 (2)  
Wipers - clean, dry, lint-free

 B. Consumable Materials
 (1)  
B000541 - Detergent - commercial

 (2)  
B00036 - Solvent - Freon TF or Freon 113 (alternative) B00130 - Isopropyl Alcohol, TT-I-735 (alternative)

 C. Access
 (1)  Location Zone
 205 Electronic Compartment

 D. Procedure
 S 022-017
 (1)  Do the removal task of the check valve.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 21-58-91
 ú ú 02 Page 204 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 112-018
 (2)  
Clean the check valve:

 (a)  
Use a soft-bristle brush and a solution of water and detergent to clean the check valve.

 WARNING:_______DO NOT GET FREON IN YOUR MOUTH, EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE FREON. PUT ON SPLASH GOGGLES AND GLOVES WHEN YOU USE FREON. FREON IS A POISONOUS MATERIAL WHICH CAN CAUSE INJURY OR DAMAGE.

 (b)  
Use one of the solvents, Freon or Isopropyl Alcohol, to clean the unwanted materials on the check valve. 1) Clean the check valve again with the solution of water and

 detergent.

 (c)  
Flush the check valve with clean water.

 (d)  
Dry the check valve with a wiper or use compressed air.

 (3)  
Do the installation task of the check valve.

 S 422-019
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 21-58-91
 ú ú 03 Page 205 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CONDITIONED AIR TEMPERATURE CONTROL SYSTEM -
__________________________________________ DESCRIPTION AND OPERATION
_________________________
 1.  General_______
 A.  Conditioned air temperature control covers that portion of the air conditioning system which starts, regulates, and shuts down air conditioning equipment to provide a selected temperature in the control and passenger cabins. Two sets of controls are provided. One set controls the left mix valve for control cabin temperature regulation. The other controls the right mix valve and provides for the passenger cabin. Normally each system functions automatically according to selections made on the forward overhead panel. Separate manual control systems are provided as an alternate method for raising or lowering control and passenger cabin temperature.
 B.  Controlling the temperature in the cabins is accomplished by controlling the temperature of air entering the cabins. Air conditioning operation begins when the pack switches are turned on. The switches open the pack valves permitting bleed air from the pneumatic system to enter the air conditioning system.
　
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