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AIR CONDITIONING - COOLING - RAM AIR TEMPERATURE SENSOR
AIR CONDITIONING - COOLING - RAM AIR TEMPERATURE SENSOR
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.3
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-830
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - COOLING - RAM AIR TEMPERATURE SENSOR
21-50-00
Page 98.4
D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The ram air system controls the air flow through the primary
and secondary heat exchangers. These are the ram air control
components:
* Pack/zone temperature controller
* Ram air inlet actuator
* Ram air control temperature sensor
* Ram air inlet deflector door
* Ram air inlet modulation panels
* Ram air ducts.
These are the three modes of control for the ram air system:
* Ground
* Flight (flaps not up)
* Flight (flaps up).
The air conditioning accessory unit (ACAU) relays control
power to the pack/zone temperature controller and the ram air
inlet actuator.
There are separate control circuits for the left and right ram air
systems.
Ground Mode
When the airplane is on the ground, the AIR/GND sensing
system supplies a discrete (ground) to energize the K10 pack
air ground relay, and the K5 ram mod control relay.
The K16 ram air actuator disable relay is energized. This
removes the left pack zone controller from the ram air inlet
actuator.
115v ac power goes through these relay contacts to supply a
retract signal to the left ram air actuator:
* Ram BITE enable (K15 - NORMAL)
* Ram mod control (K5 - OPEN)
* Pack air/ground (K10 - GROUND)
* Ram air actuator disable (K16 - RETRACT).
When the actuator is in the fully retracted position, the S1 switch
opens to remove power to the motor.
The deflector door is in the extended position when the actuator
shaft is between the S1 and S2 switch positions.
The S3 switch in the ram air actuator connects a ground to the
air conditioning/bleed air controls panel. This causes the left
RAM DOOR FULL OPEN light to come on.
Flight (Flaps Not Up)
At takeoff, the AIR/GND sensing system opens to de-energize
the K10 relay. The K5 relay stays energized with a ground from
the flaps switch when the flaps are not up.
AIR CONDITIONING - COOLING - RAM AIR SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.5
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-835
Power to the motor extend coils is through the internal S2
switch at takeoff. The deflector door moves out of the airstream
when the actuator shaft is at the S2 switch position.
Flight Cruise (Flaps Up)
In flight, when the flaps are at a full up position, the K5 relay deenergizes.
This de-energizes the K16 relay and gives the pack/
zone controller control of the ram air inlet actuator.
The ram air control circuits in the pack/zone controller supply
command signals to the actuator. The pack/zone controller gets
temperature signals from the ram air sensor. The ram air
sensor sends temperature signals from the air cycle machine
(ACM) compressor outlet. The controller uses the air
(temperature) sensor signal in a bridge circuit. The bridge
circuit reads the ACM compressor temperature as an error
signal, too hot or too cold. The nominal (balanced) control
temperature is 230F/110C. The pack/zone controller opens or
closes the ram air inlet modulation panels to keep this balance.
The normal position for the ram air inlet modulation panel in
flight with the flaps up is faired (closed). This is to decrease
drag.
BITE
When BITE is done with the pack/zone temperature controller,
relay K15 energizes. This simulates the on ground position
regardless of flap position.
Training Information Point
If the DOOR FULL OPEN LIGHT is on during flight cruise mode,
it may be one of these three possible problems:
* Ram air system may have a blockage
* Heat exchangers are dirty
* Electrical failure.
NOTE: The left side uses the flap switch and the right side
uses the flap/slat electronics unit.
AIR CONDITIONING - COOLING - RAM AIR SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.6
D633A101-GUN Oct 10/2005
　
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