canadair
chaHencjer
OPERATING MANUAL
PSP 606
SECTION 2
AIR CONDITIONING/PRESSURIZATION
TABLE OF CONTENTS
Subject Page
AIR CONDITIONING 1
General
Bleed Air Control System
Refrigeration System 7
| Ventilation System 8A
Temperature Control 10
Footwarmer and Demister 12
Avionics Cooling
PRESSURIZATION 13
General
Outflow Valves
Cabin Pressurization Control Panel 14
Automatic Selector
Manual Regulator
Emergency Depressurization Switch/light
Emergency Pressurization Switch/light
Emergency Air Ventilation Switch/light
Low Pressure Warning Light 17
Ground Control Subsystem
Safety Relief Systems
Cabin Altitude Li miters
Automatic Operation
Manual Operation 18
LIST OF ILLUSTRATIONS
Figure
Number Title Page
1 Air Conditioning and Pressurization Control Panels 2
2 Air Conditioning System - Schematic 3/4
3 Air Conditioning Unit (ACU) - Schematic 5/6
4 Bleed Air Control Panel 9
2-CONTENTS
Page 1
Feb 12/88
canadair
chauenQer
OPERATING MANUAL
PSP 606
Fi gure
Number Title Page
5 Temperature Control Panel 11
6 Cabin Pressurization Control Panel (2 Sheets) 15
7 Cabin Pressure Control - Schematic 19
8 Cabin Altitude Indicator 20
2 - CONTENTS
Page 2
Mar 01/85
canaaair
chaiiencjer
OPERATING MANUAL
PSP 606
SECTION 2
AIR CONDITIONING/PRESSURIZATION
AIR CONDITIONING (Figures 1, 2 and 3)
A. General
The air conditioning system provides complete environmental control for the
cabin and flight compartment. The system also provides air for instrument
cooling, windshield demist and flight compartment footwarmers. The
avionics equipment in the underfloor area is cooled by flight compartment
exhaust air.
Two air cycle type air conditioning units, designated ACU 1 and ACU 2,
deliver cold and conditioned air to the cabin and flight compartment. Air
for operation of the ACUs is delivered from the bleed air manifold of the
bleed air system and is supplied by engine bleeds, the APU or a ground air
source (refer to Section 17, POWER PLANT for details of the aircraft bleed
system).
The cabin and flight compartment temperatures are controlled either
automatically or manually and may be selected from 16 to 32°C (60 to 90°F).
The air conditioning system includes a bleed air control system, a
refrigeration system, a cold and conditioned air ventilation system, and a
cabin and flight compartment temperature control system.
B. Bleed Air Control System (Figure 4)
Bleed air from the bleed air manifold enters the ACUs via associated
pressure regulator and shutoff valves controlled by the L and R ACU
switch/lights on the BLEED AIR panel. Each pressure regulator and shutoff
valve delivers air to its ACU at a regulated pressure of either 39.5 or
24.0 psi. The higher pressure, which improves ACU cooling on the ground
and ensures that a sufficient volume of air is available to the system
during single ACU operation, is delivered whenever a weight-on-wheels
signal is present or when only one of the ACUs is in operation. The lower
pressure is delivered when both ACUs are in operation and no
weight-on-wheels signal is present. An exception to the sequence of
pressure delivery occurs if engine bleed air is selected when the aircraft
is on the ground. In this case, the lower pressure is delivered,
regardless of the number of ACUs in operation or the weight-on-wheels
signal, to prevent pressure surges through the ACU if engine air is
selected after relatively low pressure air from the APU or a ground air
source has been used to pressurize the bleed air manifold.
SECTION 2
Page 1
Mar 01/85
canadair
cftanenqer
OPERATING MANUAL
PS P 606
^ CABIN PRESSURIZATION 'O;
CABIN
(PRESS LOWl
MODE
AUTO
^ v EMER ' RAM EMER
DEPRESS AIR VENT PRSSSN
S 2I If
ON E
CABIN PRESSURIZATION CONTROL PANEL
CABIN ALTITUDE INDICATOR
LOOP A
BOTH
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LING —
|| "BLEED-1
1 CLOSED
DUCT
1 FAIL 1
— ISOL
OPEN
— R ENG 1
|| BLEED ||
CLOSED
DUCT
[1 FAIL ||
BLEED AIR CONTROL PANEL ©
® TEMPERATURE CONTROL @
COCKPIT CABIN
STANDBY
NORMAL - v J L / " MAN
STANDBY
NORMAL - \ J L r * MAN
®
COLD HOT COLD HOT
TEMPERATURE CONTROL PANEL ©
Air Conditioning and Pressurization
Control Panels
Figure 1
SECTION 2
Page 2
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