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One exhaust fan is set to operate when you apply system
power.
Normal Exhaust Fan Operation
The normal exhaust fan operates when these conditions are
present:
* Thermal switches in the normal exhaust fan are closed (no
overheat condition)
* Exhaust equipment cooling switch is in the NORMAL position
The normal exhaust fan control relay R29 energizes to supply
115v ac 3-phase power to the fan.
Alternate Exhaust Fan Operation
The alternate exhaust fan operates when the exhaust
equipment cooling switch is in the ALTERNATE position and
the same logic conditions as the normal fan.
Fan Failure/Low Flow
If a fan does not operate, the exhaust low flow detector low
alarm signal operates. The system OFF light and the MASTER
CAUTION lights come on.
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General
The low flow detectors monitor the air flow and temperature of
the equipment cooling air. The detectors send an alarm signal
when the equipment cooling air flow is not within limits.
Functional Description
The low flow detectors have an internal BIT. At power-up, the
detectors and alarm circuits do a test for correct operation.
These are the indications of a detector failure:
* Equipment cooling OFF amber light
* MASTER CAUTION and OVERHEAD annunciator lights.
The supply and exhaust low flow detectors supply a low and
high alarm signals. These signals occur when the equipment
cooling air flow is not within limits.
The low alarm signal gives these indications:
* Equipment cooling OFF amber light
* MASTER CAUTION and OVERHEAD annunciator lights.
The supply system control interrupt relay (R645) causes an
inhibit of the low alarm signal. This occurs when the equipment
cooling system is in the smoke removal mode.
The ground crew horn automatically operates when the
airplane is on the ground and these conditions are present:
* High alarm or the ON DC signal from either ADIRU is active
for 20 seconds or more
* Left or right ADIRU switch is in the ALIGN or NAV position.
The exhaust system does not have an inhibit for smoke
removal.
Training Information Point
The equipment cooling system uses cabin air for cooling. The
cabin air can contain contaminates such as tar, nicotine, dust,
and other unwanted particles. A regular schedule to clean this
equipment is necessary for proper operation of the cooling
system and detectors.
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AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - LOW FLOW DETECTOR - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The overboard exhaust valve has two functions. It controls the
quantity of equipment cooling exhaust air that flows overboard
and it operates in a smoke removal mode.
Location
The overboard exhaust valve is in the aft center section of the
EE compartment. It is below the raised platform aft of the
electronic equipment access door.
Physical Description
The four-inch diameter overboard exhaust valve has these
physical features:
* Valve body
* Electromechanical rotary actuator (electric motor, gear
　
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