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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-004
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - COMPONENT LOCATION
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - COMPONENT LOCATION
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-004
General
The controls and indications for the equipment cooling system
are on the equipment cooling panel on the P5 forward overhead
panel.
Operation
The equipment cooling panel has an equipment cooling
SUPPLY switch and an equipment cooling EXHAUST switch.
Each switch has these two positions:
* NORM
* ALTN.
You put the switch in one of these positions to operate the
normal or the alternate fan.
Indication
The equipment cooling system has low flow detectors to give a
warning when there is not sufficient cooling airflow. On the
ground, the crew call horn sounds when low flow is detected in
the supply system. This gives you warning and that you should
shut down airplane electrical systems to prevent an overheat
condition.
These are the warning indications:
* Amber OFF lights on the P5 panel
* MASTER CAUTION and OVERHEAD annunciator lights.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OPERATION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
21-27-00-003
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OPERATION
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OPERATION
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-003
Purpose
The equipment cooling air filter removes small particles of dirt
from the air before it enters the EE cooling system. This
prevents contamination of the electrical and the electronic
equipment.
Location
The equipment cooling air filter is in the EE compartment, on
the right sidewall. It is upstream of the supply fans. Access to
the air filter is from the forward cargo compartment right
forward access panel.
Physical Description
The air filter is a cartridge type filter inside the air filter housing.
Training Information Point
A clogged air filter causes low flow through the equipment
cooling supply system. Replacement of the air filter on a regular
maintenance schedule is necesssary. Release the quick
release tabs on the air filter housing cover to get access to
the filters.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - AIR FILTER
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
21-27-00-008
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - AIR FILTER
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - AIR FILTER
EFFECTIVITY
GUN ALL 21-27-00
Page 11
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-008
Purpose
The supply and exhaust fans move air around electrical
equipment to remove heat.
General Description
There are two sets of fans (normal and alternate) for the supply
and the exhaust systems. One fan per system operates at a
time.
Location
The supply fans and check valves are in the EE compartment.
You get access to the supply fans through the EE compartment.
The exhaust fans and check valves are in the aft lower section
of the EE compartment. You get access to the exhaust fans
through the raised access panel aft of the equipment access
door.
Physical Description
The fans are single-stage fans with an integral induction motor.
They each have a check valve and install as a unit. The fans
have thermal switches that protect the fans from overheat
damage.
Training Information Point
The supply and exhaust fans install with V-band clamps. Arrows
show the correct direction of flow. The supply and exhaust fans
are interchangeable.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - SUPPLY AND EXHAUST FANS
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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