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chamber B. When the pressure in chamber B increases, the
trim air PRSOV opens more. When pressure in chamber B
decreases, the trim air PRSOV moves toward closed.
NOTE: The cabin sense port supplies cabin pressure to the
FCSOV to control flow.
When you turn the manual override cam assembly, the manual
override cam assembly moves the cam follower to close the
manual override valve. This will shutoff unregulated air to these
components:
* Solenoid valve
* Relief valve
* Servo regulator.
AIR CONDITIONING - TEMPERATURE CONTROL - TRIM AIR PRSOV - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-819
AIR CONDITIONING - TEMPERATURE CONTROL - TRIM AIR PRSOV - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - TRIM AIR PRSOV - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 65
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-819
Purpose
There are three zone trim air modulating valves. Each zone
valve controls the flow of trim air to its related air conditioning
zone:
* Flight compartment zone
* Forward passenger compartment zone
* Aft passenger compartment zone.
Location
The flight compartment zone trim air modulating valve is in the
left air conditioning compartment.
The forward and aft zone trim air modulating valves are in the
right air conditioning compartment.
Physical Description
The zone trim air modulating valves are electric motor-driven
single plate butterfly valves. They are identical and
interchangeable.
The valves have these parts:
* Electric motor assembly
* Position indicator
* Manual override knob
* Electrical connector.
Functional Description
The valves use 115v ac power. The valve drive signals come
from the pack zone controllers. A mechanical gear train with a
slip clutch transfers motor motion to the valve.
Training Information Point
There is a position indicator on the zone trim air modulating
valves. The valves are normally in the closed position when the
trim air is off.
You can manually close the valve with the manual override
knob if the electric motor fails. Turn the knob in the direction
shown on the knob placard.
AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TRIM AIR MODULATING VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 66
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-820
AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TRIM AIR MODULATING VALVE
AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TRIM AIR MODULATING VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 67
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-820
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AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TRIM AIR MODULATING VALVE
21-60-00
Page 68
D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Normal Function
When the trim air switch is in the ON position and the flight
compartment temperature selector is in AUTO, the flight
compartment trim air modulating valve connects to the right
pack/zone temperature controller. This sends an enable signal
to the two controllers to start control of the flight compartment
temperature.
The selected zone temperature goes to the right pack/zone
temperature controller and is compared with the actual
temperature in the flight compartment. The difference makes
a zone duct temperature demand. It is limited to 35F to 145F (2C
to 63C). This demand is compared with the actual supply duct
temperature and the difference is used to move the flight
compartment trim air modulating valve.
The alternate power relay (K21) suplies electrical power from
one of two different sources. When K21 energizes, 28v dc is
from bus 1. When K21 deenergizes, 28v dc is from the battery
bus.
Non-Normal Function - System Overheat
When the temperature in the duct is 190F (88C), the duct
overheat switch closes. This energizes the K6 flight deck zone
　
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