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EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.37
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-826
Functional Description
When you put the pack switch to the AUTO/HIGH position, K13
PACK/HIGH relay energizes if the K7 pack valve closed relay is
open. When K13 is energized, the pack/zone controller is
enabled and the K17 pack temperature control valve inop relay
is energized.
K21 alternate power relay gives two possible sources for
electrical power. When K21 energizes, it gives 28v dc from bus
1. When K21 de-energizes, it gives 28v dc from the battery bus.
28v dc goes to these relays:
* K13 pack AUTO/HIGH relay
* K17 pack TCV INOP relay.
The pack/zone temperature controller controls the position of
the temperature control valve. To move the temperature control
valve, the auto pack control in the pack/zone temperature
controller compares the temperature requirements of the three
zones. The pack/zone temperature controller satisfies the
temperature requirement of the zone that needs the most
cooling. The controller uses this temperature requirement as a
PACK DEMAND signal to establish the temperature output of
the pack. The temperature requirement is compared with the
actual pack outlet temperature sensed by the pack temperature
sensor. This signal is compared with a 35F (2C) limit for ice
protection of the mix manifold.
Ice protection is provided for the mix manifold by a 35F (2C)
temperature limit to the output of the pack. The mix manifold
temperature input to the pack/zone controller is from two
sensors on the mix manifold. The pack/zone temperature
controller compares the two inputs and uses the coldest signal.
The mix manifold temperature and the PACK DEMAND are then
compared with a 35F (2C) limit and the controller controls the
temperature control valve.
Open and close limit switches in the temperature control valve
provide feedback signals to the pack/zone temperature
controllers.
When the zone temperature selectors are in the OFF position,
the pack/zone temperature controller uses a fixed 75F (24C)
demand to establish the temperature control of the pack.
These are the failures that cause the temperature control valve
to close and activate the standby temperature control in the
opposite controller:
* Pack control
* Pack sensor or interface
* Temperature control valve or driver.
These failures set the pack INOP and FAULT switches.
AIR CONDITIONING - COOLING - AUTO CONTROL - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.38
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-805
AIR CONDITIONING - COOLING - AUTO CONTROL - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - AUTO CONTROL - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.39
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-805
Purpose
The standby temperature control provides temperature control
of the pack output if there is a pack automatic control failure.
Functional Description
When you put the pack switch to the AUTO/HIGH position, K13
PACK/HIGH relay energizes if the K7 pack valve closed relay is
open. When K13 is energized, the pack/zone controller is
enabled. If the pack automatic temperature control fails, there is
an activate standby pack command signal. This connects the
opposite controller to the standby temperature control valve for
temperature control.
The standby pack control uses the standby temperature control
valve to regulate the output of the pack.
If all zone and auto pack temperature controls fail, the analog
standby pack temperature controls will satisfy the average
temperature demand of the two passenger cabin zones. The
flight compartment zone is not used.
NOTE: If the auto and standby pack temperature controls fail,
the pack should be shutdown. If this is not done, the
pack continues to operate until an overtemperature
condition occurs.
AIR CONDITIONING - COOLING - STANDBY CONTROL - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.40
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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