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THIS WILL PREVENT DAMAGE TO THE DUCT.
AIR CONDITIONING - COOLING - COMPRESSOR DISCHARGE AND TURBINE INLET OVERHEAT SWITCHES
EFFECTIVITY
GUN 101-118 21-50-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-018
AIR CONDITIONING - COOLING - COMPRESSOR DISCHARGE AND TURBINE INLET OVERHEAT SWITCHES
AIR CONDITIONING - COOLING - COMPRESSOR DISCHARGE AND TURBINE INLET OVERHEAT SWITCHES
EFFECTIVITY
GUN 101-118 21-50-00
Page 61
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-018
Purpose
The pack discharge duct overheat switch monitors the air
temperature in the supply ducts for an overheat condition.
Location
The left pack discharge duct overheat switch is in the flight
compartment distribution supply duct. Access is through the left
sidewall, outboard of the E2 rack in the EE compartment.
The right pack discharge duct overheat switch is in the
passenger overhead distribution duct.
Physical Description
The pack discharge duct overheat switch has these parts:
* Switch housing
* Electrical connector
* Probe.
The electrical connections are made through a hermetically
sealed connector.
Training Information Point
CAUTION: USE TWO WRENCHES WHEN YOU REMOVE/
INSTALL THE SWITCH FROM/TO THE BOSS.
THIS WILL PREVENT DAMAGE TO THE DUCT.
AIR CONDITIONING - COOLING - PACK DISCHARGE OVERHEAT SWITCH
EFFECTIVITY
GUN 101-118 21-50-00
Page 62
D633A101-GUN Oct 10/2006
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-019
AIR CONDITIONING - COOLING - PACK DISCHARGE OVERHEAT SWITCH
AIR CONDITIONING - COOLING - PACK DISCHARGE OVERHEAT SWITCH
EFFECTIVITY
GUN 101-118 21-50-00
Page 63
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-019
Purpose
The pack protection circuit stops operation of the pack to
prevent damage to the air cycle machine and discomfort to the
airplane passengers.
Normal Operation
The pack flow control and shutoff valve receives 28v dc, from
the battery bus. The valve open solenoid receives 28v dc
through the pack switch in the AUTO or HIGH position, and a deenergized
pack overheat relay. This will electrically enable the
flow control and shutoff valve (pack valve) to move to the open
position.
Pack Trip
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
goes to the close solenoid of the flow control and shutoff valve.
Indication
These are the indications when pack trip occurs:
* PACK TRIP OFF amber light comes on
* MASTER CAUTION and AIR COND annunciator lights come
on.
Pack Reset
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 P5-10 panel to deenergize the
overheat relay.
AIR CONDITIONING - COOLING - PACK PROTECTION FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
Page 64
D633A101-GUN Oct 10/2006
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21-50-00-020
AIR CONDITIONING - COOLING - PACK PROTECTION FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - PACK PROTECTION FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
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21-50-00-020
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AIR CONDITIONING - COOLING - PACK PROTECTION FUNCTIONAL DESCRIPTION
21-50-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Functional Description
The flow control shutoff valve (FCSOV) gets hot bleed air from
the pneumatic manifold. The FCSOV controls the flow of hot
　
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