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21-50-00-806
AIR CONDITIONING - COOLING - STANDBY CONTROL - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - STANDBY CONTROL - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.41
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-806
Purpose
These temperature switches monitor the pack for an overheat
condition:
* Compressor discharge overheat switch
* Turbine inlet overheat switch
* Pack discharge overheat switch.
Location
There is a compressor discharge overheat switch and a turbine
inlet overheat switch in each air conditioning compartment.
The compressor discharge overheat switch is in the duct
between the air cycle machine compressor section and the
secondary heat exchanger.
The turbine inlet overheat switch is in the duct from the reheater
to the air cycle machine turbine section.
The pack discharge overheat switch is in the input duct to the
mix manifold in the distribution bay.
Functional Description
The overheat switches look similar. The compressor discharge
overheat switch and the turbine inlet overheat switch have
different operation temperatures.
The compressor discharge overheat switch has an operation
temperature of 390F (199C).
The turbine inlet overheat switch has an operation temperature
of 210F (99C).
The pack discharge overheat switch has an operation
temperature of 250F (121C).
Training Information Point
CAUTION: USE TWO WRENCHES WHEN YOU REMOVE/
INSTALL THE SWITCH IN/OUT OF THE BOSS.
THIS WILL PREVENT DAMAGE TO THE DUCT.
AIR CONDITIONING - COOLING - PACK OVERHEAT SWITCHES
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.42
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-836
AIR CONDITIONING - COOLING - PACK OVERHEAT SWITCHES
AIR CONDITIONING - COOLING - PACK OVERHEAT SWITCHES
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.43
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-836
Functional Description
Pack protection is a function of these three switches:
* Compressor discharge overheat switch
* Turbine inlet overheat switch
* Pack discharge duct overheat switch
The switches are normally open. When an overheat condition
occurs, the overheat switch closes. This energizes the pack
overheat relay. When the pack overheat relay energizes, power
is supplied to the close solenoid of the flow control and shutoff
valve.
These are the indications when a pack trip occurs:
* PACK amber light
* MASTER CAUTION and AIR COND annunciator lights.
The overheat relay latches in the overheat position. When the
condition that caused the pack trip off is corrected, push the
TRIP RESET switch on the air conditioning/bleed air control
panel to de-energize the overheat relay.
Training Information Point
If the PACK light comes on and the pack can be reset, the heat
exchangers may be obstructed or dirty.
If the PACK light comes on and the pack can not be reset, do a
test of the compressor discharge and turbine inlet overheat
switches.
AIR CONDITIONING - COOLING - PACK PROTECTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.44
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-827
AIR CONDITIONING - COOLING - PACK PROTECTION - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - PACK PROTECTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.45
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-827
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - COOLING - PACK PROTECTION - FUNCTIONAL DESCRIPTION
21-50-00
Page 98.46
D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Functional Description
The flow control and shutoff valve gets hot bleed air from the
pneumatic manifold. The flow control and shutoff valve controls
the flow of hot bleed air to the trim air system, primary heat
　
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