Kollsman Autoschedule
Pressurization Control System
  Cabin Pressurization Controller

 

Location - The cabin pressurization controller is located on the tilted switch panel in the cockpit.  

Citation Encore Panel Shown (Other Models Similar)

1.  Cabin Pressurization Controller
2. AUTO/MANUAL Switch
3. Manual Pressurization Control Valve

4. EMER DUMP Switch (Bravo, Encore, Excel)
CABIN DUMP Switch (525 Series)

Operation - The pressurization controller automatically controls the cabin altitude (pressure) and cabin altitude rate of change by varying the position of the outflow valves based on the following inputs: Landing field altitude, Cabin pressure, Airplane altitude, Squat switch position and Throttle position.  Click the "Description" tab for more detailed information on the cabin pressurization controller and system operation.

Cabin Pressurization Controller

Pins Functions
11 DIVE SOLENOID - Ground output to primary outflow valve (pin A)
10 CLIMB SOLENOID - Ground output to primary outflow valve (pin B)
15 28 VDC (VALVE) - 28 VDC input from NORM PRESS circuit breaker
3 ARINC 429 ALT INPUT A - Altitude information  from Air Data Computer 
18 ARINC 429 ALT INPUT B - Altitude information  from Air Data Computer
34 SQUAT SWITCH - 28 VDC input with weight-on-wheels
36 GND 5 VDC LIGHTING - Input from airframe ground
28 5 VDC LIGHTING - 5 VDC input from instrument panel lighting system 
13 28 VDC (CONTROLLER) - 28 VDC input from NORM PRESS circuit breaker
33 T/O POWER - 28 VDC input with both throttles >85% N2 (525 Series, Bravo, Encore) or >62 TLA (Excel)
12 HIGH ALT SIGNAL - Output signal to delay CAB ALT annunciator illumination (CJ2, CJ3, Encore, and Excel)
14 GND (CONTROLLER) - Input from airframe ground
29 GND (VALVE) - Input from airframe ground
39 GND (CHASSIS) - Input from airframe ground
42 DUMP SWITCH - Ground input with DUMP switch selected to the ON position
43 TO AUTO/MAN SWITCH - 28 VDC output to AUTO/MANUAL switch
44 FROM AUTO/MAN SWITCH - 28 VDC return from AUTO/MANUAL switch
30 VALID-PRESSURE-AUTO - 28 VDC return from DUMP switch & AUTO/MANUAL switch
26 CONTROLLER VALID - 28 VDC output to DUMP Switch & AUTO/MANUAL switch 
5 CONFIG STRAP 1 - Configures controller operation for specific aircraft model 
21 CONFIG STRAP 2 - Configures controller operation for specific aircraft model 
6 CONFIG STRAP 3 - Configures controller operation for specific aircraft model 
22 CONFIG STRAP 4 - Configures controller operation for specific aircraft model 
20 CONFIG STRAP COMMON - Configures controller operation for specific aircraft model