REV03026720010220
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7.
Hold the Up Directional Arrow for 2-3 seconds, then use the Up and Down Directional Arrows to change the rP1
value.
Note: For information on factory set points or timer delays please refer to the “Accessories and Additional Configuration
Parameters” subsection in the “Technical Assistance and Ordering” section.
Internal Pressure Relief Adjustment
Note: Please consult AXI International before performing any internal pressure relief settings to avoid warranty issues
The pump used on the STS systems come from the factory with a pre-set internal pressure relief bypass. If the pressure
on the discharge of the pump rises past this set point, the internal bypass will open and recirculate the fuel in the head of
the pump to protect the itself and any downstream components. When this happens, the discharge branch of the system
will not see the proper fuel flow, most likely causing the system to fail on a low flow alarm.
By adjusting this Internal Pressure Relief to a point past the set point on the Pressure Switch, the system will fail on a
High-Pressure condition before the relief begins to open, allowing fuel to flow fully while within the acceptable pressure
range. The desired set point for pump Internal Relief Valve is around 48-50 PSI, which is higher than the pressure switch
setting, and lower than the operational pressure limit on the system fine filter.
Tightening the Bypass Spring:
1.
To tighten the spring in the pump head, remove the blue cover nut located on the left side of the pump head
2.
Loosen the secondary nut to allow for screw adjustment
3.
Using a flathead screwdriver, tighten the screw two full turns (clockwise)
4.
Restore the secondary nut and blue cover, tightening them down to their original positions
Initial Test Procedures
With breakers and power turned on, and pump running, check all alarms for proper operation:
•
Leak Detection
- Manually raise the float switch located at the bottom of the leak-basin. The pump should
immediately turn off and the “Leak Detection” alarm should be indicated on the System Controller. Reset the
alarm by lowering the float switch and pushing the Alarm Reset button on the enclosure door panel.
•
High Vacuum Alarm
- Slowly, partially close the inlet ball valve. At 16” HG, the pump should turn off and “PLS
SERVICE PRIM. FILTER…” or “High Vacuum” alarm should be indicated on the System Controller. Open the
inlet ball valve again. Reset the alarm by pushing the Alarm Reset button on the enclosure door panel.
•
High Pressure Alarm
- Slowly, partially close the outlet ball valve. At 22 PSI, the pump should turn off (after a
delay of about 1 second) and “PLS SERVICE SEC. FILTER…” or “High Pressure” alarm should be indicated on
the System Controller. Open the outlet ball valve again. Reset the alarm by pushing the Alarm Reset button on
the enclosure door panel.
•
Water Sensor
- Jump the Water Detection Sensor Probes by placing a conductor across the two horizontal
contacts. The pump should turn off after 10 seconds and “High Water Alarm” or “PLS. DRAIN WATER/BOWL…”
should be indicated on the System Controller. Remove the metal and reset the alarm by pushing the Alarm Reset
button on the enclosure door panel.
Note: Systems with the Auto Water Drain (AWD) functionality have two sets of water sensing probes on the primary filter
bowl. Please refer to the AWD section on for additional information.
•
No Flow Alarm
– Ensure orange light indicator turns on when the system pump is on (moving fluid) and off when
the system is not running. Disconnect the M12 connection on the back of the flow switch. The pump should turn
off and the “No Flow Alarm” or “PLEASE PRIME SYSTEM / CHECK FLOW” should be indicated on the System
Summary of Contents for STS 6020
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