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* Right recirculation fan switch - AUTO.
GUN 001-012, 101-108, 201-999
When the switches are in the normal position, relay R650 is
deenergized. Power then goes through R648 and R650 to
energize the valve actuator to the NORMAL position.
High Flow Mode
The high flow mode increases cabin airflow. This occurs when
the valve is open.
These are the switch positions for the high flow mode of
operation:
* Left or right pack switch - HIGH
GUN 101-108
* Recirculation fan switch - AUTO.
GUN 001-012, 201-999
* Right recirculation fan switch - AUTO.
GUN 001-012, 101-108, 201-999
When the switches are in the high flow position, relay R650 is
energized and power goes to time delay relay R649. Relay K1
controls relay R649. The cabin pressurization system gives an
open/closed enable signal to K1.
With an open enable signal, R649 is deenergized and power
energizes the actuator to the SMOKE (open) position.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-012, 101-108, 201-999 21-27-00
Page 27
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-011
Smoke Removal Mode
The smoke removal mode opens the valve to remove smoke
from the EE compartments and flight compartment.
These are the switch positions for the smoke removal mode:
* Left or right pack switch - HIGH
GUN 101-108
* Recirculation fan switch - OFF.
GUN 001-012, 201-999
* Right recirculation fan switch - OFF.
GUN 001-012, 101-108, 201-999
When the switches are in the smoke removal position, smoke
control relay R648 energizes. Power then goes through R648 to
energize the valve actuator to the SMOKE (open) position.
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 (open) position. The close enable
signal keeps the actuator in the NORMAL position.
The open enable signal is set when the outflow valve is more
than 8.5 degrees open. The open enable signal stays true until
the outflow valve is less than 2 degrees open.
The closed enable signal is set when the outflow valve is less
than 2.0 degrees open. The closed enable signal energizes
relay K1. Relay R649 then energizes. R649 remains energized
until five minutes after relay K1 relaxes. The five-minute time
delay lets the cabin pressure become stable.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-012, 101-108, 201-999 21-27-00
Page 28
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-011
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-108 21-27-00
Page 29
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-011
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OEV - ELECTRICAL FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-012, 201-999 21-27-00
Page 30
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-011
General
When the airplane is on the ground, ground sensing relay R592
is energized, smoke control relay R648 is de-energized, and
overboard exhaust valve command relay R650 is de-energized.
Power goes through R650 to power the overboard exhaust
valve DC motor actuator to the NORMAL position. When the
valve actuator is in the NORMAL position, the valve position is a
function of airflow (the valve is open until the airplane
pressurizes). The valve is open on the ground.
When the airplane is in the air, ground sensing relay R592 is deenergized.
In pressurized flight, the normal position for the
overboard exhaust valve is closed. A 28V DC motor rotary
actuator opens the valve in flight for more airflow or for smoke
removal.
The overboard exhaust valve has three modes of operation.
These are the three modes of operation:
* Normal
* High flow
* Smoke removal.
Normal Mode
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