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Mar 01/85
chaiienQer
OPERATING MANUAL
PSP 606
LEGEND
COLD AIR
COOLED AIR FROM ACU
Ml I I l l m BLEEDAIR
l l l l l l l l l l l i l TEMP CONTROL TRIM AIR
S B H B B CONDITIONED AIR
l l l l l l l l l l l i l COOLED BLEED AIR
RAM AIR
FLIGHT COMPARTMENT BULKHEAD
LD
E
A
T I
R £)• OUTLE
CONDITIONED
AIR VENT
DEMIST
MDSH
; " DEMIST
MUFFLER
MIIFPI pa = FOOTWARMER
l M U F F L t R = AND DEMIST
— CONTROL
l\ FOOTWARMER
WINDSHIELD ™
DEMIST —
.INSTRUMENT
'COOLING
_ S ^
H
FLIGHT COMPARTMENT
SENSOR FAN
CONDITIONED |
AIR VENT
RENG
BLEED AIR
SWITCH/LIGHT
RACU
SWITCH/LIGHT
CHECK VALVE (TYPICAL!
_ FROM
™ RIGHT
ENGINE
COLD AIR
OUTLET )£>•
OVERBOARD
A l l
CONDITIONING
UNIT 2
(SEE FIG. 3)
t
\
AIR
CONDITIONING
UNIT 1
(SEE FIG. 3)
OVERBOARD
CKPT HEAT SWITCH
STBY 1
OFF
NORM
NOTES
/ V\ FIGURE 3. ITEM 2
/ 2 \ FIGURE 3. ITEM 9
L ACU
SWITCH/LIGHT
Air Conditioning System - Schematic
Figure 2
SECTION 2
Page 3/4
Mar 01/85
r gr&ZSmJW. t CONDITIONED
11
X/ Js
A II
—-®
12 13
1 BLEED AIR MANIFOLD
2 ACU PRESSURE REGULATOR AND SHUTOFF VALVE
3 FLOW LIMITER
4 EJECTOR SHUTOFF VALVE
5 EJECTOR
6 PRECOOLER
7 SERVO PRESSURE REGULATING VALVE
B ELECTROMAGNETIC CONTROL VALVE
9 TEMPERATURE CONTROL MODULATING VALVE
10 TEMPERATURE LIMITER
11 DUCT TEMPERATURE SENSOR
12 ELECTRONIC TERMPERATURE CONTROL UNIT
13 TEMPERATURE CONTROL PANEL
14 COMPARTMENT FAN/SENSOR
15 DUCT TEMPERATURE SENSOR
16 LOW LIMIT TEMPERATURE CONTROLLER
17 ELECTROMAGNETIC CONTROL VALVE
1B LOW LIMIT MODULATING VALVE
19 COLD AIR UNIT COMPRESSOR
20 COLD AIR UNIT TURBINE SECTION
21 WATER SEPARATOR
22 PRESSURE SENSING SWITCH
23 THERMAL SWITCH
24 PRIMARY HEAT EXCHANGER
25 SECONDARY HEAT EXCHANGER
26 ASPIRATOR
27 RAM AIR DUCT
28 THERMAL SWITCH (ACU FAIL LIGHT)
RAM AIR
IN
LEGEND
ENGINE BLEED AIR
PRECOOLED AIR
PRIMARY HEAT EXCHANGER
AIR
SECONDARY HEAT EXCHANGER
AIR
COLD AIR
CONDITIONED AIR
SERVO PRESSURE
ELECTRICAL SIGNAL
EFFECTiVITY
VA A/C incorporating SB 600-0476
Air Conditioning Unit (ACU) - Schematic
Figure 3
SECTION 2
Page 5/6
Feb 12/88
OPERATING MANUAL
PSP 606
Refrigeration System (Figure 3)
The refrigeration system consists of the left and right ACUs located in the
rear equipment bay. Each ACU includes a precooler, primary and secondary
heat exchangers, and a cold air unit. A ram air intake, located at the
base of the vertical stabilizer leading edge, directs ram air through
bifurcated ducting across each ACU heat exchanger and precooler. The
expended ram air is ducted overboard.
NOTE: In the following description only one ACU is described, the other is
similar.
Bleed air from the bleed air control system is fed to the ACU and is passed
through the precooler, where it is cooled to a temperature of less than
287°C (550°F). The precooled air is passed through a flow limiter and then
splits into two paths. One path feeds the precooled air to a temperature
control modulating valve where it is used to increase the temperature of
the fully cooled air to provide conditioned air. The remaining path is
passed to the primary heat exchanger where it is cooled further.
The cooled air from the primary heat exchanger is passed to the compressor
section of the cold air unit where it is compressed and heated. The heat
of compression is removed in the secondary heat exchanger after which the
air is passed to the turbine section of the cold air unit. The air expands
and cools considerably as it drives the cold air unit turbine and is rcuted
to a water separator before entering the ventilation system. The water
separator removes condensation produced in the cold air unit turbine and
directs it to an aspirator in the ram air duct. Bleed air tapped from the
secondary heat exchanger sprays the condensation across the heat exchangers
to improve system cooling.
To prevent the accumulation of ice in the water separator and to provide
for maximum system cooling efficiency, the temperature of the air
discharged from the cold air unit is maintained at 2#C by a low limit
　
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