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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -INTRODUCTION
The CTCs get air ground information from the air ground system. The CTCs use this information to calculate the APU DEMAND signal.
AIMS give these functions for the zone temperature control system:
*
Indication
*
Airplane at cruise, FMC data
*
Ground test.
A status message shows if a CTC fails. AIMS also gives maintenance messages that relate to sensor and valve faults.
The CTCs give the APU controller (APUC) an APU DEMAND signal when the APU supplies air for pack operation on the ground. The signal is used to control the quantity of air necessary for ventilation and heating or cooling in the airplane.
EFFECTIVITY BEJ ALL 21-61-00
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D633W101-BEJ Sep 05/2002
AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -INTRODUCTION
EFFECTIVITY BEJ ALL 21-61-00
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -CTC -PHYSICAL DESCRIPTION
Location
The left and right cabin temperature controllers (CTC) are in the main equipment center on the E1 and E2 racks.
Physical Description
The CTCs weigh 25 lbs (11.5 kg) each. The controllers have two test connectors on the front. The connectors are for shop service.
The CTCs use operational program software (OPS) that you can load.
Training Information Point
The CTCs are LRUs. The circuit cards in the CTCs are not LRUs.
The Left and right CTCs are interchangeable.
EFFECTIVITY BEJ ALL 21-61-00
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -CTC -PHYSICAL DESCRIPTION
EFFECTIVITY BEJ ALL 21-61-00
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -CTC -INTERFACES 1
Purpose
The left and right cabin temperature controllers (CTC) give control, indications, and BIT for these systems:
*
Cooling
*
Temperature control
*
Recirculation.
Control Channels
The CTCs have two control channels that are the same, 1 and 2. One channel is in control (primary) and the other is tracking (backup). The channel in control changes if any of these conditions occur:
*
Channel in control has a fault (processor, RVDT or sensor interface, motor or torque motor driver)
*
Ground test
*
Air to ground change and both related flow control valves closed.
The left and right CTCs change control channels independently of each other. You can see which CTC control channel is in control on the air conditioning maintenance page. A status message shows on the status display if both channels in one CTC fail. See the air conditioning section for more information about the air conditioning maintenance page (SECTION 21-00).
The CTCs control these subsystems:
SYSTEM SUB-SYSTEM CTC CONTROL
COOLING L PACK FLOW CONTROL L PRI, *[1]
R PACK FLOW CONTROL R PRI, *[2]
L PACK CONTROL L PRI
R PACK CONTROL R PRI
MIX MANIFOLD TEMPERATURE CONTROL L BU
MIX MANIFOLD TEMPERATURE CONTROL R PRI
TEMP CONTROL ZONE TEMP CTRL -FLT DK AND ZONES A, C, E L PRI, *[3]
ZONE TEMP CTRL -ZONES B, D, F R PRI
L TRIM AIR PRESS REG & SHUTOFF CTRL L PRI
R TRIM AIR PRESS REG & SHUTOFF CTRL R PRI
RECIRC-ULATION UPPER & LOWER FAN CONTROL L BU
UPPER & LOWER FAN CONTROL R PRI
*[1] L ASCPC GIVES LIMITED BACKUP IF L CTC FAILS *[2] R ASCPC GIVES LIMITED BACKUP IF R CTC FAILS *[3] R CTC GIVES COOLING FOR F/D IF L PACK OFF
Power -Interfaces
Each channel in the left and right CTCs use power from two isolated sources. Channels 1 and 2 in the left CTC use 115v ac from the left transfer bus and 28v dc from the left main bus. Channels 1 and 2 in the right CTC use 115v ac from the right transfer bus and 28v dc from the right main bus.
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