AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -RAM AIR -COMPONENT LOCATIONS
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AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -DUAL HEAT EXCHANGER
Purpose
The dual heat exchanger removes heat from pneumatic system air and from air compressed by the air cycle machine.
Physical Description
The dual heat exchanger has a primary and secondary heat exchanger core. There are inlets and outlets for the pneumatic system air and the ram air.
You remove and install the dual heat exchanger as a single unit. It weights 194 Lb (88 Kg).
The heat exchanger for the left pack and the right pack are identical. The orientation of the heat exchanger in one pack is a mirror image of the other. The airflow is also a mirror image. The pneumatic system air inlets are always on the top and the outlets are on the bottom. The ram air always flows from outboard to inboard.
Training Information Point
A panel outboard of each ECS access door gives access to the heat exchanger cleanout panels. Use high pressure water or air to loosen dirt.
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AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -DUAL HEAT EXCHANGER
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D633W101-BEJ Jan 05/2002
AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -ECONOMY COOLING CHECK VALVE
Purpose
The economy cooling check valve permits air flow around the ACM compressor when the pack starts to operate or when the pack has an ACM failure.
When the economy cooling check valve is open, the air flows
directly from the primary heat secondary heat exchanger inlet. exchanger outlet to the
Physical Description
The economy flappers. cooling check valve has two spring -loa ded
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AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -ECONOMY COOLING CHECK VALVE
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D633W101-BEJ Jan 05/2002
AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -AIR CYCLE MACHINE
Purpose
The air cycle machine (ACM) compresses air in the compressor stage and expands air in the two turbine stages.
Physical Description
The air cycle machine has one compressor stage and two isolated turbine stages. These stages turn on the same shaft. A fan in the ram air flow also connects to this shaft.
Air bearings hold the shaft of the air cycle machine in position when the shaft turns.
Functional Description
The compressor compresses the air from the primary heat exchanger. The compressed air flows out to other pack components.
Each turbine receives air from different points in the pack. The air expands and decreases in temperature as it goes through the turbine. The energy released in the turbines turns the shaft of the air cycle machine.
The ram air fan moves ambient air through the ram air ducts when the airplane is on the ground.
Training Information Point
There is a direction arrow near a placard on the ACM that shows the direction to rotate the ACM before you do a torque check. Damage can occur if you manually turn the ACM in the incorrect direction. The placard has the maximum allowable torque.
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AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -AIR CYCLE MACHINE
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AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -CONDENSER/REHEATER
Purpose
The condenser/reheater has two functions. It cools the air in the pack before it goes through the water collector. This lets the moisture in the air collect in the water collector. The condenser/ reheater heats pack air to add energy to the air. The heated air helps operate the turbine in the air cycle machine.
Physical Description
The condenser/reheater has condenser and reheater heat exchanger cores. These cores are within a container through which pack air flows. The condenser/reheater weighs approximately 70 lb (32kg).
Functional Description
Air comes into the condenser/reheater from the secondary heat exchanger at A. This air flows over both heat exchanger cores. The heat exchangers absorb heat from this air. The decrease in air temperature condenses water so that the water collector can remove it from the air. The air flows out of the condenser/ reheater at B.
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