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heating it, then pumps it into a condenser,
which transfers heat from the refrigerant to
cooler ambient air passing over the condenser
coils (see Figure 11-5). The cooled refrigerant
condenses into a pressurized liquid.
Evaporator units depressurize the liquid refrigerant
into a spray, cooling the liquid during the
process. The cold spray circulates inside the
evaporator coils. A fan in each evaporator unit
blows interior air (cockpit or cabin air) across
the cold coils, cooling and dehumidifying the
air (Figure 11-6).
As the interior air transfers its heat through the
heat exchanger, the refrigerant in the coils absorbs
the heat, warms and vaporizes, then returns
it to the compressor, carrying heat away from
the aircraft interior. The refrigerant circulates
continuously throughout the system, transferring
heat from the interior air to the ambient air.
The forward evaporator is adjacent to the copilot
seat. It provides conditioned air to the crew
through two vents outboard of the instrument
panel. The aft evaporator is on the aft bulkhead
and provides cooling air to the passengers
through individual overheat vents.
510OM-00 11-9
CITATION MUSTANG OPERATING MANUAL
AFT EVAPORATOR
FWD EVAPORATOR
LOAD
SHEDDING
FUNCTION
HEAT
EXCHANGER
HEAT
EXCHANGER
COMPRESSOR
COMPRESSOR
ASSEMBLY
CONDENSER
ASSEMBLY
P
H
PT T
PT T
DRAIN
EVAPORATOR BLOWER
COPILOT
OUTLET
PILOT
OUTLET
WINDSHIELD
OUTLETS
EXPANSION
VALVE
DRAIN
EXPANSION
VALVE
EVAPORATOR
BLOWER
CABIN
VENTS
SERVICE
CONNECTION
CONDENSER
BLOWER
DISCHARGE LINE
(HIGH PRESSURE)
HOUR
METER
PRESSURE
RELIEF
VALVE
LIQUID LINE
(HIGH PRESSURE)
SUCTION LINE
(LOW PRESSURE)
AIR-CONDITIONING
INLET
AIR-CONDITIONING
EXHAUST
FROM AFT CABIN
AFT CABIN
OUTLET
SERVICE
CONNECTION
TEMPERATURE
SENSOR
TEMPERATURE
SENSOR 100 AMP
CURRENT
LIMITER
FROM FWD CABIN
RECEIVER/
DRYER
HEAT
EXCHANGER
FROM FWD CABIN
LEGEND
SUCTION
TO OUTLETS
HIGH-PRESSURE LIQUID
AIR-CONDITIONING EXHAUST
COMPRESSOR DISCHARGE
AIR-CONDITIONING INLET
Figure 11-6. Vapor-Cycle Schematic
11-10 510OM-00
CITATION MUSTANG OPERATING MANUAL
COMPONENTS
Refrigerant
The Citation Mustang uses R-134a-type
refrigerant.
Compressor
The DC-powered compressor in the tail cone
area compresses warm, low-pressure refrigerant
vapor from the evaporators into a hot,
high-pressure gas, then pumps it through the
condenser.
On the ground as determined by either squat
switch, the compressor can operate from the
right generator or an external power unit
(EPU). When airborne, it only operates when
BOTH generators are operating. If a generator
fails while airborne, the compressor is automatically
load-shed (disconnected from DC
power to reduce electrical loads).
The compressor operation hours are not the
same as aircraft hours. A separate hourmeter
for the compressor is on the compressor assembly,
above the battery in the tail cone. To read
the hourmeter, access it through a panel directly
opposite the baggage door on the right
forward side of the baggage compartment.
Condenser
The condenser is in the tail cone and cools the
hot, high-pressure refrigerant gas flowing
from the compressor prior to entry into the
cabin pressure vessel. It utilizes finned coils
through which the refrigerant gases flow to derive
a cooling benefit from transient, ambient
air, thereby acting as a heat exchanger.
This ambient, atmospheric air is ducted
through the condenser by an inlet on the right
side of the aft tail cone. The cooling air is
then routed over the condenser coils, allowing
for the transfer of heat, and then is ducted
overboard through a duct on the upper right
side of the tail cone.
Evaporators
There are two evaporators in the vapor-cycle
system. Cold refrigerant chills the evaporator
coils. Electrically powered blowers push cabin
air over the cold evaporator coils and then
force the cold air into the cabin air distribution
system.
Water vapor from the cabin air condenses on
the evaporator coils and the liquid water is
routed overboard through two heated vents
under the fuselage (one near each evaporator)
　
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