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of the air cycle machine, where the temperature and pressure increases.
The air then flows through the secondary heat exchanger, where a pressure loss occurs and the temperature is reduced by
exchanging heat with the ram air before flowing to the reheater/condenser.
At the condenser outlet, the condensed water is extracted by centrifugal effect in the water extractor then routed to the reheater
cold air pass where air temperature increases prior to entering the air cycle machine.
The air is then expanded through the turbine of the air cycle machine to a pressure close to cabin air pressure, and subsequently,
the air temperature is reduced.
From the turbine outlet, the air flows through the condenser heat exchanger where it is used as a coolant for the water separation
loop.
The air temperature at the PACK discharge can be adjusted by opening or closing the temperature control valve. The temperature
control valve modulates the hot air flow which by-passes the air cycle machine between the primary heat exchanger
inlet and the air cycle machine turbine outlet.
The ram air is supplied upstream of the dual heat exchanger by the ram air system. It then flows through the dual heat exchanger
and is collected by the plenum.
On ground static aircraft operation, the ram air flow is generated by the suction effect of the air cycle machine fan. This
suction closes the plenum check valve. Whenever dynamic air is available at ram air inlet, the plenum check valve opens,
and the air cycle machine fan is by-passed; the ram air is then driven by the total pressure available at ram air inlet.
Upon leaving the plenum, the air is ducted towards the dual pre-cooler heat exchanger, then ducted overboard.
FLOW CONTROL VALVES
Flow control valves (FCVs), are used to control the mass airflow through the PACK and TRIM AIR system. The flow control
valves are electrically controlled, pneumatically operated, modulating shutoff valves. The AIR SOURCE selector on
the AIRCOND/BLEED control panel operate the opening and closing of these valves.
The FCVs are automatically closed when the engine START switch is selected. Shutting down the air conditioning system,
ensures that the air turbine starters (ATS) receive sufficient airflow for starter operation. When the start valve closes, the
air source returns to the previous selection.
CFO0203000_002
DUAL HEAT
EXCHANGER
PLENUM
AIR CYCLE
MACHINE
TEMPERATURE
CONTROL VALVE
REHEATER/
CONDENSER
WATER
EXTRACTOR
AIR CONDITIONING/PRESSURIZATION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 02-03-03
AIR CONDITIONING SYSTEM (Cont)
AIR CONDITIONING CONTROLS
Controls for the air conditioning system are located at the AIR COND/BLEED panel on the center pedestal.
AIR SOURCE
NORM
OFF PACK ONLY
AIR COND / BLEED
TRIM AIR
ONLY
COCKPIT
COLD HOT
RAM AIR
ON
XBLEED R BLEED
OFF
MAN TEMP
ON
CABIN
COLD HOT
APU
ON
L BLEED
OFF
CFO0202002_003
AIR CONDITIONING/PRESSURIZATION
Volume 2 Flight Crew Operating Manual Sep 13/2004
02-03-04 CSP 100-6 REV 1
AIR CONDITIONING SYSTEM (Cont)
Temperature selectors — Used to select desired temperature for the cockpit and cabin.
MAN TEMP — Used when automatic temperature control using cabin or cockpit ventilation sensors is not
working.
AIR SOURCE selector —
- OFF - both flow control valves will be closed, preventing bleed air for pressurization and air conditioning
from entering the cabin
- NORM - The normal switch position. This setting allows bleed air from the left and right sides of
the manifold to flow through the PACK and the TRIM AIR valves, providing conditioned air to the
cabin
- PACK ONLY - Opens the left flow control valve and closes the right flow control valve and precooler
crossover valve (PCV), resulting in all bleed air flowing through the PACK and none
through the trim air valves. This selection is used when a TRIM AIR failure exists. A PACK ONLY
(S) CAS will be displayed.
- TRIM AIR ONLY - Opens the right flow control valve and closes the left flow control valve and
(PCV), resulting in all bleed air flowing through the trim air valves and none through the PACK.
This selection is used when a PACK failure exists. A TRIM AIR ONLY (S) CAS will be displayed.
RAM AIR INLET
Ram air enters the aircraft at the ram air inlet at the base of the vertical fin. Ram air is used as the cooling medium for the
air-to-air heat exchangers. Ram air passes through the secondary, primary, and precooler heat exchangers where heat is extracted
from the air circulated through the air conditioning system. After passing through the heat exchangers, the air is
　
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