Purging Air from System and Testing Completing Installation
MDE-5427E Latitude
™
Installation Manual · July 2022 Page 8-5
8 Turn off STP, bleed pressure using the mechanical valve, remove the valve and hose, and
reinstall the pipe plug to the shear valve using UL-approved sealant suitable for the fuel
involved.
9 For purging air from the system with fuel in lines, perform all steps in “For New and Existing
Pumps and Dispensers with Fuel in Li
nes (Purging Through Nozzle)”.
For New and Existing Pumps and Dispensers with Fuel in Lines (Purging
Through Nozzle)
CAUTION
Purging air at high flow rates through the meter can permanently damage them.
Noise is not an indication of overspeed in many cases.
Overspeed meter damage is not covered by warranty. Follow all instructions
carefully.
To purge air in new and existing pumps/dispensers where underground product lines are full
with fuel, proceed as follows:
1 Lift the nozzle handle for the hose being purged.
Note: For purging in Latitude units, perform the
procedure for purging in “For New
Dispensers (Purging Through Shear Valve)” on page 8-4 for the selected meter.
2 Place the nozzle in the approved container.
3 Slowly open the nozzle until you obtain a slow, constant stream of fuel flow.
Note: For SMART Meter-equipped units,
never exceed the nozzle slow latch setting until fuel
flow is steady.
4
For Pump this Amount
Start-ups (installing new systems) 35 gallons (130 liters) per hose
Existing sites where the product lines are full 50 gallons (186 liters) per hose*
*This value depends on the following procedures in
the sequence listed (especially for new
sites). Also, a lot can depend on line lengths, unusual plumbing situations (air traps), and so on;
what may be good for most sites may not work for all. Generally, you can observe the effect of
air if successive calibration checks read plus. After they stop reading plus, you have purged all
the air.
Purge the system with the amount of fuel specified in the following table:
CAUTION
Meters and other hydraulic devices can be permanently damaged by
contamination if units are not equipped with filters during purging and other
installation processes.
Non-use of filters during installation is considered abuse. Meters and other
components that fail due to the contamination introduced during installation are
not covered by warranty.
Never remove filters during installation. Do not substitute.
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