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overheat relay to the overheat position. When K6 is in the
overheat position, K4 energizes to the close position, and the
flight deck zone trim air modulating valve closes.
Non-Normal Function - Failure
The FAULT and INOP switches are set by these primary flight
compartment failures:
* Cabin temperature sensor
* Cabin temperature sensor interface
* Duct temperature sensor
* Duct temperature sensor interface
* Cabin temperature selector
* Cabin temperature selector interface
* Zone trim air modulating valve
* Zone trim air modulating valve driver.
When the FAULT switch is set, K3 relaxes. This connects the
backup flight compartment zone control to the flight
compartment zone trim air valve. The backup flight
compartment zone control controls the flight compartment
trim air modulating valve with the same logic as the primary
flight compartment zone control.
The backup FAULT switch is set by these backup flight
compartment failures:
* Cabin temperature sensor
* Cabin temperature sensor interface
* Duct temperature sensor
* Duct temperature sensor interface
* Cabin temperature selector
* Cabin temperature selector interface
* Zone trim air modulating valve
AIR CONDITIONING - TEMPERATURE CONTROL - FLIGHT COMPARTMENT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 69
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-806
* Zone trim air modulating valve driver.
The backup INOP switch is set by these backup flight
compartment failures:
* Cabin temperature sensor
* Cabin temperature sensor interface
* Cabin temperature selector
* Cabin temperature selector interface.
NOTE: Failure of the temperature selector causes a default to
a 75F (24C) set point.
When the primary and backup flight compartment zone controls
fail, the zone temperature control system is off. This off signal
goes to the pack control section of the pack/zone controllers.
The left pack/zone controller controls the left pack to satisfy the
flight compartment zone duct demand. The right pack/zone
controller controls the right pack to satisfy the coolest
temperature requirements for the passenger compartments.
AIR CONDITIONING - TEMPERATURE CONTROL - FLIGHT COMPARTMENT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 70
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-806
AIR CONDITIONING - TEMPERATURE CONTROL - FLIGHT COMPARTMENT - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - FLIGHT COMPARTMENT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 71
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-806
Normal Function
When the trim air switch is in the ON position and the passenger
compartment temperature selector is in AUTO, the passenger
compartment trim air modulating valve connects to the right
pack/zone temperature controller.
The alternate power relay (K21) supplies 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.
The selected zone temperature goes to the pack/zone
temperature controller and is compared with the actual
temperature in the passenger compartment. The difference
makes a zone duct temperature demand. The limits are 35F to
160F (2C to 71C). This demand is compared with the actual
supply duct temperature and the difference is used to move the
passenger compartment trim air modulating valve.
Non-Normal Function - System overheat
When the temperature in the duct is 190F (88C), the duct
overheat switch closes. This energizes K1 passenger zone
overheat relay to the overheat position. When K1 is in the
overheat position, K2 passenger trim air off relay energizes to
the close position and the passenger zone trim air modulating
valve closes.
Non-Normal Function - System Failure
The FAULT switch is set by these passenger compartment
failures:
* Cabin temperature sensor
* Cabin temperature sensor interface
* Duct temperature sensor
* Duct temperature sensor interface
* Cabin temperature selector
* Cabin temperature selector interface
* Zone trim air modulating valve
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