TM 5-3805-281-24-1
Adjustments
3. Follow the manufacturer's instructions and evacuate
the system.
NOTE: The vacuum specifications listed are for sea level
conditions.
4. Evacuate system until low pressure gauge registers 98
kPa (980 mbar) (29 in. Hg) vacuum.
Subtract 3.4 kPa (34 mbar) (1 in. Hg) from 98 kPa
(980 mbar) (29 in. Hg) for each 300 m (1000 ft)
elevation above sea level.
System Evacuation Vacuum--Specification
Pressure ..................................................... 98 kPa (980 mbar) (29 in Hg)
Subtract Pressure For Each 300 m (1000 ft) Elevation--Specification
Pressure .......................................................... 3.4 kPa (34 bar) (1 in. Hg)
If 98 kPa (980 mbar) (29 in. Hg) vacuum cannot be
obtained in 15 minutes, test the system for leaks.
If System Evacuation Vacuum Cannot Be Obtained, Test System
For Leaks.--Specification
Time.......................................................................................... 15 Minutes
(See Leak Testing in Group 9031-25).
Evacuation--Specification
Time.......................................................................................... 15 minutes
9031
Correct any leaks.
20
8
5. When vacuum is 98 kPa (980 mbar) (29 in. Hg), close
low-side and high-side valves. Turn vacuum pump off.
6. If the vacuum decreases more than 3.4 kPa (34 mbar)
(1 in. Hg) in 5 minutes, there is a leak in the system.
Leak If Vacuum Decreases More Than--Specification
Pressure ....................................................... 3.4 kPa (34 mbar) (1 in. Hg)
7. Repair leak.
8. Start to evacuate.
Continued on next page
CED,TX14795,4341
1918AUG982/3
7-26
