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MDE-4334C Atlas Start-up and Service Manual · April 2008
Hydraulic/Mechanical Components
Purging Air from the System
To purge all air from lines and pumps/dispensers for new installations, proceed as follows
(refer to
):
1
Shut off all power to the STP involved.
2
Start with the unit farthest from the tank and then move to units that are closer to the tank.
3
Use a UL-approved sealant and connect a fuel-resistant hose and petcock valve to the shear
valve test port for dispensers. Leave the valve closed.
4
Place the end of the hose into an approved container.
5
Restore power to the STP. Activate the STP for the line being purged.
6
Open the mechanical valve and purge the product lines slowly, until a a steady stream of fuel
is observed.
7
After purging, shut off power to the STPs and remove the line and petcock valve from the
shear valve.
8
Remove the hose from the test port.
Wear eye protection and exercise caution by removing the hose slowly with a cloth or by
other means, to prevent fuel spray; fuel under pressure may remain in the product lines.
CAUTION
9
Reinstall the plug using a UL-approved pipe sealant suitable for the fuel involved.
10
Open the shear valve and restore power.
11
Check for leaks during purging.
Note: Also refer to
Purging Pumps and Dispensers (with Fuel in Product Lines)
Using the Nozzle to Purge the Unit
Use the following procedure for units that have had their product lines purged of air or have
not been drained. Begin purging by partially opening the nozzle until fuel is observed at the
nozzle, after which you can open the nozzle further to finish purging.
Purging through a fully open nozzle on a unit with air in product lines can damage the meter due
to overspeed.
Damage resulting from overspeed is not covered by warranty.
CAUTION