11
Altitude Control Mode (Fig 7.0): Negative pressure at Ps and Pt
Air Speed Indicator/ Altimeter
(Control Equalizing Valve for airspeed)
1.
Switch to Altitude Control position
2.
Connect both Ps and Pt via pressure hose to the U.U.T/D.U.T
3.
Set both Isolator valve to OPEN position
4.
Set Relief valve to OPEN position (10 inHg differential pressure protection)
5.
Close the Equalizing valve by turning knob fully clock-wise,
do not over torque
, hand tight is good
enough.
6.
Close both Pressure and Vacuum Control metering valve by turning knob fully clock-wise,
do not
over torque
, hand tight is good enough.
7.
Switch OFF VENT valve
8.
Switch on the internal Vacuum Pump.
9.
Open the Vacuum Control metering valve slowly anti-clock-wise to increase both knots and feet
reading. Control Equalizing valve for various airspeed.
10.
Switch OFF the internal vacuum pump and CLOSE Vacuum Control metering valve when readings
reaches set point.
11.
If require, CLOSE both the isolator valves.
12.
To VENT the system,
switch the x2 isolator valves to OPEN position, switch ON the VENT valve,
open the Equalizing valve slowly to equalize the pressure between Pt and Ps. When both Pt and Ps
pressure equalize, open the Pressure Control metering valve slowly anti-clock-wise to vent vacuum
pressure.
Fig 7.0
