AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -FLIGHT DECK ZONE AIR TEMP SENSORS
EFFECTIVITY BEJ ALL 21-61-00
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D633W101-BEJ Jan 05/2002
AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -CABIN ZONE AIR TEMP SENSORS
Purpose
The cabin temperature controllers (CTC) use the cabin zone temperature sensors to monitor the temperature of air pulled from the zones by the ventilation system.
Physical Description
The sensors are thermistors with two elements. Each sensor has a threaded housing with an electrical connection.
The sensors are interchangeable with the ones in the flight compartment.
Location
The sensors are in the same area as the left outboard passenger service units (PSUs). Each sensor is in a plenum that attaches to a zone air temperature sensor panel. The plenum has an air inlet grille on the lower side of the panel. The plenum has a hose that connects it to the lavatory/galley ventilation system on the upper side of the panel. The sensors are at these station locations:
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Zone A: station 464
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Zone B: station 629
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Zone B: station 673 (wiring provisions only)
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Zone C: station 821 (wiring provisions only)
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Zone C: station 901
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Zone D (forward): station 1021
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Zone D (aft): station 1122
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Zone E: station 1364
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Zone F: station 1796.
Training Information Point
Cabin temperature control zones can have one or two temperature sensors. A second sensor permits different interior configurations. Galleys, lavatories, closets, and partitions can prevent one sensor from accurately measuring the temperature in a zone. When there are two sensors in one zone, the cabin temperature controllers use an average of the temperature information from the sensors.
Any zone can have two sensors. Zone D always has two sensors. Zones B and C have wiring for a second sensor. If you install a second sensor, you must also load a new operational program configuration (OPC) software in the CTCs.
Sensors in these zones connect to the left CTC: A, C and E. Sensors in these zones connect to the right CTC: B, D and F.
The sensors have two elements so that one element supplies data to channel 1 of the related CTC and the other element supplies data to channel 2.
EFFECTIVITY BEJ ALL 21-61-00
Page 20
D633W101-BEJ Sep 05/2002
AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -CABIN ZONE AIR TEMP SENSORS
EFFECTIVITY BEJ ALL 21-61-00
Page 21
D633W101-BEJ Jan 05/2002
AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -FLIGHT DECK FUNCTIONAL DESCRIPTION
General
The flight crew uses the flight deck temperature control on the P5 overhead panel to set the target temperature for the flight deck. The low temperature value (C on the control) is 65 F (18 C). The high temperature value (W on the control) is 85 F (29 C).
The manual area on the flight deck temperature control is spring-loaded to MAN. In the W or C positions the flight deck temperature control sets the position of the flight deck trim air modulating valve.
Automatic Mode
The left CTC controls the flight deck trim air modulating valve to keep the zone temperature at the target value. The valve open and close commands go from the left CTC through the contacts of the auto/manual control flight deck trim air relay. The RVDT of the flight deck trim air modulating valve gives valve position to the left CTC. Flight deck sensors send actual temperature data to both CTCs.
Manual Mode
With the flight deck temperature control in MAN the electrical load management system (ELMS) electronics (ELEX) unit removes control of the flight deck trim air modulating valve from the CTC.
In the W position the ELMS ELEX unit supplies power to the open coil of the flight deck trim air modulating valve.
In the C position the ELMS ELEX unit supplies power to the close coil of the flight deck trim air modulating valve.
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