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When solenoid B deenergizes, the FCSOV operates in the high
flow mode.
When the airplane is in the air and flaps are up, the left ram
mode control relay K23 closes. If the right FCSOV closes, the
left low flow mode relay K18 energizes. This deenergizes
solenoid B.
Pack Switch HIGH
When the switch is in the HIGH position, solenoid B
deenergizes, and the FCSOV operates in the high flow mode.
Solenoid A energizes when the all of these conditions are true:
* Pack switch is in the HIGH position
* APU bleed switch is in the ON position
* APU operates above 95%
* Airplane is on the ground.
When solenoid A energizes, the FCSOV operates in the APU
high flow mode.
AIR CONDITIONING - COOLING - FLOW CONTROL SHUTOFF VALVE - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-006
AIR CONDITIONING - COOLING - FLOW CONTROL SHUTOFF VALVE - ELECTRICAL FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - FLOW CONTROL SHUTOFF VALVE - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
Page 17
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-006
Purpose
The primary heat exchanger (HX) removes heat from bleed air
going to the compressor section of the air cycle machine (ACM).
The primary plenum/diffuser lets ram air flow through the
primary heat exchanger and out the ram air exhaust.
Location
The primary heat exchanger and plenum/diffuser are in the aft,
outboard section of the air conditioning compartment.
Physical Description
The primary heat exchanger is an air-to-air, plate-fin, cross-flow
type heat exchanger. Two isolated airstreams flow through thin
walled channels. The channel walls are made up of plates and
fins that increase surface area.
The primary plenum/diffuser has an outer duct and an inner
duct. The outer duct is the plenum and the inner duct is the
diffuser. The inner duct has a fan bypass check valve. The fan
bypass check valve is a hinged door assembly in the lower aft
section of the diffuser.
Functional Description
Air from the FCSOV flows through the primary heat exchanger.
A cross flow of ram air removes heat before the air enters the
ACM compressor inlet.
When the airplane is on the ground, the ACM impeller fan
makes a low pressure zone. This pulls air through the heat
exchangers and up through the plenum to the impeller fan.
Then the impeller fan sends the air through the diffuser and out
the ram air exhaust. The air pressure in the diffuser keeps the
check valve closed.
When the airplane is in flight, ram air pressure opens the fan
bypass check valve.
Training Information Point
The primary heat exchanger efficiency decreases as dirt and
contamination collect on the cooling surfaces. A RAM DOOR
FULL OPEN light that stays on in flight can be an indication of a
dirty heat exchanger.
The primary heat exchanger plenum has an access panel for
inspection and clean out.
AIR CONDITIONING - COOLING - PRIMARY HEAT EXCHANGER AND PLENUM/DIFFUSER ASSEMBLY
EFFECTIVITY
GUN 101-118 21-50-00
Page 18
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-014
AIR CONDITIONING - COOLING - PRIMARY HEAT EXCHANGER AND PLENUM/DIFFUSER ASSEMBLY
AIR CONDITIONING - COOLING - PRIMARY HEAT EXCHANGER AND PLENUM/DIFFUSER ASSEMBLY
EFFECTIVITY
GUN 101-118 21-50-00
Page 19
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-014
General
These are the two sets of ram air ducts for each pack system:
* Ram air inlet
* Ram air exhaust.
Purpose
The ram air inlet ducts let cooling air flow from the ram air inlet
to the heat exchangers. The ram air exhaust ducts let air flow
from the heat exchangers discharge overboard.
Location
The ram air inlet ducts are outboard of the air conditioning
compartment. They extend forward to the ram air inlet in the
wing-to-body fairing.
The ram air exhaust ducts are aft of the air conditioning
compartments. You get access to the exhaust ducts from the air
conditioning compartment.
Physical Description
There are two ram air inlet ducts, forward and aft. The forward
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