*
The related trim air PRSOV is latched closed.

The left trim air PRSOV is latched closed if any of these conditions occur:
EFFECTIVITY
BEJ ALL

*
Flight deck zone duct overheat (190F, 88C)

*
Passenger cabin zone A duct overheat (190F, 88C)

*
Passenger cabin zone C duct overheat (190F, 88C)

*
Passenger cabin zone E duct overheat (190F, 88C)

*
Left trim air PRSOV fault

*
Left CTC fault (both channels)

*
Left trim air pressure sensor fault.

The right trim air PRSOV is latched closed if any of these conditions occur:
*
Passenger cabin zone B duct overheat (190F, 88C)

*
Passenger cabin zone D duct overheat (190F, 88C)

*
Passenger cabin zone F duct overheat (190F, 88C)

*
Right trim air PRSOV fault

*
Right CTC fault (both channels)

*
Right trim air pressure sensor fault.

Air Conditioning Reset Control
The AIR COND RESET switch is a momentary-action switch. This switch starts the system after a failure.
Flight Deck Temperature Control
The FLT DECK TEMP control lets the flight crew set the temperature for the flight deck. The control can be set to MAN or to AUTO. The MAN position lets the flight crew manually adjust the temperature to any value. The AUTO position lets the left CTC control the temperature to a target value. The minimum selectable target temperature is 65F (18C) and the maximum is 85F (29C).
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AIR CONDITIONING -TEMPERATURE CONTROL -OPERATION -FLIGHT DECK

Cabin Temperature Control
The CABIN TEMP control lets the flight crew set the master target temperature for the passenger compartment. The minimum selectable target temperature is 65F (18C) and the maximum is 85F (29C).
The left and right main buses power the FAULT indications on the trim air switches. If these buses have no power, the FAULT indication does not show.
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AIR CONDITIONING -TEMPERATURE CONTROL -OPERATION -FLIGHT DECK

EFFECTIVITY BEJ ALL  21-60-00 
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AIR CONDITIONING -TEMPERATURE CONTROL -OPERATION -CABIN CONTROLS

Cabin Controls
The flight attendants use the cabin system control panel (CSCP) or the cabin area control panel (CACP) to set temperatures for each passenger zone. The cabin temperature selection on the cabin controls main menu selects the cabin temperature screen.
Operation
The left and right arrows on the screen select a zone. The temperature of that zone in degrees C and degrees F is at the lower left area of the screen. The up and down arrows in the lower right area of the screen select the target temperature for that zone.
ECS Inactive
The ECS NO COMMUNICATION pop-up window shows when all of these conditions occur:
*
Cabin temperature screen shows

*
CTCs do not give temperature data for more than 5 seconds.

The pop-up window goes away when the cabin temperature window does not show or when the CTCs send temperature data.
Invalid Temperature Information from ECS
The INVALID DATA message shows in the actual temperature boxes or in the target temperature box when any of these conditions occur:
*
Applicable data is not supplied

*
Applicable data is not in limits.

The message goes away when the temperature data is supplied and is in limits.
Training Information Point
The CSS configuration database sets the text for the AREA DESCRIPTION and sets the number of areas. The text has a limit of 40 characters. The number of areas has a limit of 15. The usual number of areas is 3. See the cabin services system section for more information about the configuration database (SECTION 23-39).
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AIR CONDITIONING -TEMPERATURE CONTROL -OPERATION -CABIN CONTROLS

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AIR CONDITIONING -TEMPERATURE CONTROL -AIR SYNOPTIC DISPLAY AND AIR CONDITIONING MAINT PAGE

General
All temperatures on the air synoptic display and the air conditioning maintenance page are in degrees C.
Air Synoptic Display
The top part of the MFD air synoptic display shows these cabin temperature indications:
*
The MASTER box shows the cabin temperature set by the flight crew.

*
The number at the left in the F/D box is the flight deck target temperature set by the flight crew. The number at the right is the actual flight deck temperature.
　
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