4 Gas Connections
C
ONNECT THE
B
ACKFILL
G
AS AND
E
VACUATE THE
G
AS
L
INE
1. Loosen, then remove the plug from the backfill gas port on the back of the unit.
2. Insert the gas line into the port and hand tighten the connector nut. Use a 7/16 in. (11 mm)
wrench to tighten the nut until very snug.
3. Evacuate the gas line using one of the following methods. Either method will evacuate the
line and can be used on a 6 ft. or 16 ft. gas line.
After the application is installed, use one of the following methods to complete the process:
Use Service Test Mode:
n
Go to
Options > Service Test Mode
and enter the service password, then
n
Go to
Prep [n] > Service Test > Open > [gas line leak file]
.
Manually evacuate:
This method should only be used if the gas line is under 20 ft. If the gas line is longer,
the line must be purged until the line and the gas are sufficiently clean.
n
Go to
Prep [n] > Enable Manual Control
then go
Prep [n] > Show Schematic
to display the
Smart VacPrep schematic.
n
Hover the cursor over valve 7, right-click on valve 7 and select
Open
. Valve 7 is the fast evac-
uation valve and evacuates the main manifold.
n
Hover the cursor over valve 9, right-click valve 9 and select
Open
to evacuate the gas line.
Ensure the transducer and vacuum gauge readings come down to 0.00 ± .50. If they
don't, ensure the vacuum pump is powered on. If they still don't come down, close the
valves and check the pump connections for leaks.
n
Evacuate for at least 10 to 15 minutes after a good vacuum is reached. Close valves 7 and 9.
Set the regulator pressure to between 10 and 15 psi and open regulator valve.
Do not exceed 5 psi regulator pressure when backfilling sample tubes. If the gas
pressure is greater than the recommended maximum of 5 psig (35 kPag), the sample
tube could be ejected from the fitting or broken.
4 - 4
Smart VacPrep Installation Instructions and Checklist
067-42870-02 (Rev A) — June 2022
