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These are the switch positions for the normal mode of
operation:
* Left and right pack switch - AUTO/OFF
GUN 109-118
* RECIRC FAN switch - AUTO
GUN 013-099
* R RECIRC FAN switch - AUTO
GUN 013-099, 109-118
When the switches are in the normal position, the overboard
exhaust valve command relay R650 is not energized. Power
then goes through R650 to power the valve actuator to the
NORMAL position.
High Flow Mode
The high flow mode increases the ventilation of the cabin
through increased air flow.
* L PACK switch or R PACK switch - HIGH
GUN 109-118
* RECIRC FAN switch - AUTO
GUN 013-099
* R RECIRC FAN switch - AUTO
GUN 013-099, 109-118
* When the switches are in the high flow position, power goes
to time delay relay R649. The cabin pressurization system
provides an open or closed enable signal to relay K1 which
controls the state of relay R649.
* If an open enable signal is present at relay K1, relay R649 is
de-energized and power goes through R649 to energize
relay R650. Power then goes through R650 to energize the
overboard equipment valve actuator to the SMOKE (open)
position.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 013-099, 109-118 21-27-00
Page 31
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-017
* If a closed enable signal is present at relay K1, relay R649 is
energized and the overboard equipment valve actuator will
stay in the NORMAL (closed) position. Relay R649 will stay
energized for 5 minutes once K1 relaxes.
Smoke Removal Mode
The smoke removal mode opens the overboard exhaust valve
to remove smoke from the flight deck and E/E compartment.
These are the switch positions for the smoke removal mode:
* L PACK or R PACK switch - HIGH
GUN 109-118
* RECIRC FAN switch - OFF
GUN 013-099
* R RECIRC FAN switch - OFF
GUN 013-099, 109-118
When the switches are in the smoke removal position, smoke
control relay R648 energizes. Power then goes through R648
and R945 to energize the overboard exhaust valve relay R650.
Once R650 is energized, power will go to the OEV actuator to
energize the actuator to the SMOKE position which opens the
valve.
The forward fire alarm latch relay R945 and/or the aft fire alarm
latch relay R946 are energized to the alarm state once the
applicable FWD or AFT (or both) red cargo fire lights on the
cargo fire control panel come on when given a fire indication by
the smoke detectors.
Open/Close Enable Signal
The cabin pressurization system supplies an open/close enable
signal. The open enable signal lets the high flow mode energize
the actuator to the SMOKE (OEV open) position. The close
enable signal keeps the OEV actuator in the NORMAL position
(OEV closed).
The open enable signal is set when the aft outflow valve is more
than 8.5 (±1.5) degrees from closed. The open enable signal
stays true until the outflow valve is 2.0 (±1.5) degrees from
closed.
The closed enable signal is set when the outflow valve is less
than 2.0 (±1.5) degrees open. The closed enable signal
energizes relay K1 which provides the ground needed to
energize R649. Relay R649 remains energized until five minutes
after relay K1 becomes de-energized. The five minute time
delay lets the cabin pressure become stable.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 013-099, 109-118 21-27-00
Page 32
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-017
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 013-099 21-27-00
Page 33
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-017
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 109-118 21-27-00
Page 34
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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