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Electrical power for the temperature control system is 28-vdc supplied
by the R MAIN bus for the automatic mode or the R essential bus for
the manual mode. Power is supplied through the respective 1-amp
AUTO or MAN circuit breaker located on the copilot’s ENVIR panel
(TEMP CTRL group). In the event power is lost to the right main and
essential buses, the temperature control valves will fail to the full closed
(cold) position.
Pilot’s Manual
PM-126A 6-17
The following CAS illuminations are specific to duct overheat
detection:
TEMPERATURE CONTROL VALVES
The temperature control valves are pneumatically operated. Regulated
high-pressure bleed air is used to provide the required pneumatic pressure
(servo air). The APU will provide servo air when it is being used
to run the air cycle machine. The valves are spring-loaded closed and
opened with pneumatic pressure. Valve position is controlled by varying
the pneumatic pressure with a torque motor.
MANUAL TEMP SWITCH
The MANUAL TEMP switch allows the temperature control valves to
be operated manually by rotation of the respective COLD-HOT temperature
selector knob.
CREW AND CABIN COLD-HOT SELECTORS
A COCKPIT TEMPERATURE COLD-HOT and a CABIN TEMPERATURE
COLD-HOT selector are located on the ENVIRONMENTAL
CONTROL panel. During normal operation, these selectors are used to
select the desired system temperature to be maintained automatically
by the temperature controllers. In MANUAL TEMP mode (ON illuminated),
these rheostat-type selectors directly vary the current input to
the pneumatic torque motors which position the temperature control
valves. Rotating the selectors clockwise from COLD to HOT is equivalent
to selecting temperatures ranging from 60° F (16° C) to 90° F
(32° C).
CAS Color Description
CAB DUCT OVHT Amber Temperature of the cabin bleed air distribution
duct has exceeded the system limit.
CKPT DUCT OVHT Amber Temperature of the cockpit bleed air distribution
duct has exceeded the system limit.
Pilot’s Manual
6-18 PM-126A
TEMPERATURE CONTROL SCHEMATIC
Figure 6-5
CABIN
TEMP
CONTROL
VALVE
COCKPIT
TEMP
CONTROL
VALVE
SUPPLY
PRESSURE
REGULATOR
HIGH-PRESSURE
BLEED AIR
(SERVO AIR)
TORQUE
MOTOR
TORQUE
MOTOR
CABIN
TEMPERATURE
CONTROL
COCKPIT
TEMPERATURE
CONTROL
CABIN
FAN
CABIN
COCKPIT
CABIN AIR
TEMPERATURE
SENSOR
COCKPIT AIR
TEMPERATURE
SENSOR
BLEED AIR CHECK VALVE
ELECTRICAL
PNEUMATIC
SUPPLY LINE
CONDITIONED AIR
AIR
CYCLE
MACHINE
CABIN
COLD HOT
CREW
COLD HOT
REFRIGERATED
AIR
TO OVERHEAD OUTLETS
PRECOOLED
BLEED AIR
(from PRSOV)
LIMITER SENSOR
LIMITER SENSOR
1. CKPT DUCT OVHT
2. CAB DUCT OVHT
EICAS MESSAGES
MANUAL
TEMP
ON
MANUAL
TEMP
ON
H
TEMP CONT
CAB TEMP °F 78
CKPT
C
CAB
1
2
Pilot’s Manual
PM-126A 6-19
AIR DISTRIBUTION
Conditioned air enters the cabin through three separate ducts. Two
ducts supply air to the floor and overhead diffusers. The third duct supplies
air to the sidewall diffusers. Crew and passengers may regulate
the gasper air by opening or closing the individual outlets.
The environmental control system will automatically divert some of
the air from the overhead diffusers to the floor diffusers. This flow splitting
is accomplished by a temperature activated splitter vane which diverts
the majority of the flow to the floor diffusers during heating
mode, and allows the majority of the flow to the overhead diffuser during
cooling mode. This feature minimizes vertical air stratification in
the cabin and provides for more efficient cabin heating.
Pilot’s Manual
6-20 PM-126A
COCKPIT/CABIN AIR DISTRIBUTION SCHEMATIC
Figure 6-6
CONDITIONED AIR
FOR CABIN
CONDITIONED AIR
FOR COCKPIT
CONDITIONED AIR
FOR CABIN
VARIABLE OPENING
CHECK VALVE AIR OUTLET (WEMACS)
FLOOR
DIFFUSER
SPLITTER
VANE
SPLITTER
VANE
OVERHEAD
DIFFUSER
CABIN
TAILCONE
OVERHEAD
DIFFUSER
FLOOR
DIFFUSER
SIDEWALL
DIFFUSERS
SIDEWALL
DIFFUSERS
OVERHEAD
OUTLET
COCKPIT
CABIN
REFRIGERATED AIR
FOR OVERHEAD OUTLETS
LH EMERGENCY
PRESSURIZATION
VALVE
　
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