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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-005
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - SUPPLY AND EXHAUST FANS
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - SUPPLY AND EXHAUST FANS
EFFECTIVITY
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Page 13
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-005
Purpose
The low flow sensors monitor air flow for the equipment cooling
system. When airflow cooling quality through the equipment is
not sufficient, the sensor supplies an indication.
Location
The low flow sensors are in the forward equipment
compartment. They are in the supply and exhaust ducts of the
equipment cooling system. Access to the sensors is through the
forward equipment compartment access door.
Functional Description
The low flow sensors are a hot wire anemometer type. The low
flow sensor monitors the airflow and temperature of the
equipment cooling air. The sensor sends an alarm signal
when the equipment cooling airflow is not within limits.
The low flow sensors have an internal BIT. At power-up, the low
flow sensors and alarm circuits do a test for correct operation. If
the sensor(s) fail the BIT test, the alarm circuit causes the
MASTER CAUTION light and the related EQUIP COOLING OFF
light to come on.
Interfaces
The low flow sensors supply an alarm signal to these
components for indication:
* Flight recorder/mach airspeed module
* The equipment cooling panel
* The ADIRS (crew call).
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - LOW FLOW DETECTOR
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-009
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - LOW FLOW DETECTOR
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - LOW FLOW DETECTOR
EFFECTIVITY
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Page 15
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-009
General
The supply fan supplies cooling air to the equipment in the EE
compartment and flight compartment.
There are two supply fans, normal, and alternate.
One supply fan is set to operate when you apply system power.
Normal Supply Fan Operation
The normal supply fan operates when these conditions are
present:
* Thermal switches in the normal supply fan are closed (no
overheat condition)
* Supply system control interrupt relay R645 is in the normal
(de-energized) position
* Supply equipment cooling switch is in the NORMAL position.
The normal supply fan control relay R347 energizes to supply
115v ac 3-phase power to the fan.
Alternate Supply Fan Operation
The alternate supply fan operates when the supply 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 supply low flow detector low alarm
signal operates. The system OFF light and MASTER CAUTION
lights come on.
Smoke/Interrupt
When the smoke control relay R648 energizes, it supplies 28v
dc to energize the supply system control interrupt relay R645.
The supply system control interrupt relay R645 energizes and
removes power to the normal and alternate fans. The supply
low flow detector receives an inhibit signal. This prevents the
low flow signal to cause the OFF light and MASTER CAUTION
lights to come on.
The supply system control interrupt relay R645 de-energizes
after a five-minute time delay.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - SUPPLY FAN - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 16
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-006
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - SUPPLY FAN - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - SUPPLY FAN - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 21-27-00
Page 17
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-006
General
The exhaust fans pull air from equipment in the EE
compartment and flight compartment.
There are two exhaust fans, normal and alternate.
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