Axi STS 7030, Руководство пользователя

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PRIMING THE SYSTEM
The pump supplied with the STS 7030 is NOT automatically self-priming and must not be run dry.
! WARNING ! If the pump is allowed to run without fuel, pump damage will occur.
The pump head of the STS 7030 unit is shipped from the factory filled with Diesel #2 to facilitate initial
lubrication. This will not eliminate the necessity to prime the complete system. The STS 7030 is primed by
using the externally installed priming tee (not provided) on the suction side of the system. Also the
suction line must be completely filled with fuel prior to the initial system start-up.
PRIMING PROCEDURE:
1. Ensure the pump is filled with #2 Diesel fuel.
2. Ensure that the inlet ball valve is in the open and the outlet ball valve is in the closed position.
3. Slightly open the manual air vent valve (bleed screw) located just below the pressure gauge on
the primary filter(position #14 – page 5).
4. Open the externally installed priming tee (located at the highest point of the suction plumbing),
fill the line with fuel until fuel escapes from bleed screw (manual air vent), close the manual air
vent, continue filling until all air is bled from the plumbing lines and system, close the priming tee.
(for tanks situated on a lower level than the STS 7030, it is recommended that a foot valve is
installed at the fuel tank to hold the fuel column).
5. Make sure to completely fill suction line to its highest point with fuel (no trapped air), in particular
when the suction line exits the tank top and the STS 7030 is located below that level.
6. Open the outlet ball valve and ensure the inlet ball valve is also in open position.
7. Switch on the pump and observe fuel flow.
The system is equipped with a vacuum gauge on the input side of the pump. The gauge should read 0 to
11" HG vacuum maximum under normal conditions. Vacuum gauge readings reaching 12" HG vacuum
indicate excessive debris in the Nexus Y strainer (or a flow restriction or too high suction height and
therefore pressure drop in the suction line) and will result in pump shutdown and activate the alarm
“HIGH VACUUM ALARM”.
Note: 12" HG vacuum = clogged strainer or suction line flow restriction / excessive lift.
The system’s pressure gauge on the secondary filter should show 25 PSI maximum pressure under
normal conditions (.433 PSI = 1' vertical head pressure). Pressure gauge readings in excess of 25 PSI
pressure indicate excessive filter clogging, or fuel line restrictions and/or friction.
Differential pressure over 25 PSI indicates filter clogging (“HIGH PRESSURE ALARM” indicator) and will
automatically shut down the pump.
The pressure relief valve has a 40-45 PSI set point. Pump discharge pressure in excess of 40-45 PSI will
cause the pressure relief valve to open and vent fuel back to the fuel transfer pump inlet side.