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 C.  When the pack valve is opened, the pack valve closed limit switch opens to de-energize the pack valve closed relay. When the relay is de-energized, contacts within the relay close to initiate all temperature control and overheat protection circuits in the air conditioning system.
 D.  Downstream of the pack valves part of the air branches off and passes forward to the mixing chamber and the remainder passes through the air cycle system to be cooled before going to the mixing chamber. The proportioning of air through the system depends on the position of the air mix valve. The mix valve regulates hot air bypassing the air cycle system and air going through the air cycle system. This air is recombined later in proper proportions at the mix chamber. The position of the valve depends on signals from the temperature control system controller according to the temperature of the air in the control cabin or passenger cabin compared with that requested by the temperature selector.
 E.  During automatic operation, a regulation system continuously monitors cabin temperature, duct temperature, and changes in cabin supply air temperature to keep the cabins at the selected temperature level. During manual operation, the mix valve changes position as a result of direct electrical control. The indicating system permits monitoring of cabin temperature, cabin supply duct temperature, and mix valve position.
 F.  Each temperature control system includes an air mix (temperature control) valve, a 190°F (88°C) duct overheat thermal switch, a 250°F (121°C) duct overheat thermal switch, a pack switch, and both manual and automatic temperature regulating circuits (Fig. 1).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

OVERHEAD 
PASSENGER CABIN  DISTRIBUTION 
TEMPERATURE SENSOR  DUCT 
ASSEMBLY  SEE  E 
SEE  A 
PASSENGER 
CABIN 
CONTROL CABIN  MIX VALVE 
TEMPERATURE SENSOR 
CONTROL 
SEE  D  CABIN 
CABIN  MIX VALVE 
TEMPERATURE 
MODULE 
(P5-17) 
SEE  C 

MAIN DISTRIBUTION MANIFOLD
TEMPERATURE SEE B
CONTROLLER
AIRPLANES WITH OVAL OVERHEAD DISTRIBUTION DUCTS
PASSENGER CABIN OVERHEAD
TEMPERATURE SENSOR DISTRIBUTION
ASSEMBLY
DUCTS 
SEE  A  SEE  F 
PASSENGER 
CABIN 
CONTROL CABIN  MIX VALVE 
TEMPERATURE SENSOR 
SEE  D 
CONTROL 
CABIN  CABIN 
TEMPERATURE  MIX VALVE 
MODULE 
(P5-17) 
SEE  C 

MAIN DISTRIBUTION MANIFOLD
TEMPERATURE SEE B
CONTROLLER
AIRPLANES WITH ROUND OVERHEAD DISTRIBUTION DUCTS
Conditioned Air Temperature Control Systems - Component Location Figure 1 (Sheet 1)
F64899
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TEMPERATURE BULB
TEMPERATURE
SENSOR TEMPERATURE BULB
TEMPERATURE FWD
SENSOR
TEMPERATURE SENSOR FAN TEMPERATURE
FWD
SENSOR FAN
PASSENGER CABIN TEMPERATURE SENSOR ASSEMBLY
PASSENGER CABIN TEMPERATURE A 2SENSOR ASSEMBLY
A1
TO CONTROL CABIN
DUCT LIMIT 
DUCT  SENSOR 
SENSOR ANTICIPATOR  250`F DUCT OVERHEAT  CONT CABIN  AIR TEMP  PASS CABIN 
SWITCH  SUPPLY  PASS 
DUCT  CABIN 
190`F  AIR MIX  AIR MIX 
DUCT OVERHEAT  VALVE  VALVE 
SWITCH 

60
40 TEMP 80
DUCT DUCT20
OVERHEAT A OVERHEAT A
100 C FWD
AUTO AUTO
NOAL NOAL

COOL WARM COOL WARM

WARM COOL

MAIN DISTRIBUTION MANIFOLD  COOL OFF OFF WARM
MANUAL MANUAL
B
CABIN TEMPERATURE MODULE (P5-17)
　
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