Axi STS 6000 P-35 Parts list manual

5400 Division Dr. | Fort Myers, FL 33905
239 690-9589 | Toll Free 877-425-4239 | FAX [phone]
www.AXI-International.com
STS
STS 6000 P-35 | 7000 P-35
Instruction, Operating, &
Maintenance Manual
ENCLOSED FUEL MAINTENANCE SYSTEM
REV03016735010220

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Table of Contents
Table of Contents ................................................................................................................................................................ 2
General Overview ................................................................................................................................................................ 4
STS 6000 P-35 | 7000 P-35 Specifications........................................................................................................................ 4
System Components ........................................................................................................................................................... 5
Control and Safety Devices................................................................................................................................................ 5
Fuel Conditioner................................................................................................................................................................. 5
Primary Filter/Water Separator .......................................................................................................................................... 5
Secondary Filter ................................................................................................................................................................. 5
Plumbing ............................................................................................................................................................................ 5
Multi-Tank Assembly – If Applicable .................................................................................................................................. 5
Auto Water Drain (AWD) Assembly – If Applicable............................................................................................................ 5
Manual Additive Injection – If Applicable............................................................................................................................ 6
Auto Additive Injection Assembly – If Applicable ............................................................................................................... 6
System Operation ................................................................................................................................................................ 7
Inlet Solenoid Operation..................................................................................................................................................... 7
Alarms ................................................................................................................................................................................ 7
Multi-Tank – If Applicable................................................................................................................................................... 8
Auto Water Drain (AWD) – If Applicable ............................................................................................................................ 8
Manual Additive Injection – If Applicable............................................................................................................................ 8
Auto Additive Injection – If Applicable ................................................................................................................................ 9
Primary Inspection ............................................................................................................................................................ 10
Checklist........................................................................................................................................................................... 10
Installation.......................................................................................................................................................................... 11
Mounting .......................................................................................................................................................................... 11
Electrical........................................................................................................................................................................... 11
Field Connections – If Applicable..................................................................................................................................... 11
Plumbing .......................................................................................................................................................................... 11
Typical Plumbing Installation (Schematically) .................................................................................................................. 12
Important Installation Precautions.................................................................................................................................... 12
Multi-Tank Installation – If Applicable............................................................................................................................... 12
Controller............................................................................................................................................................................ 13
Setting the Current Date and Time (6000 Series Controller) ........................................................................................... 13
Programming the Timer (6000 Series Controller) ............................................................................................................ 13
Setting the Current Date and Time (7000 Series Controller) ........................................................................................... 13
Programming the Timer (7000 Series Controller) ............................................................................................................ 13
Touchscreen Menu Structure (7000 Series Controller).................................................................................................... 14
Modbus TCP/IP Communication (7000 Series Controller)............................................................................................... 14
Commissioning/Initial Start-Up ........................................................................................................................................ 15
Gauge Venting ................................................................................................................................................................. 15
Initial Test Procedures ..................................................................................................................................................... 15
Maintenance ....................................................................................................................................................................... 16
Preventative Maintenance................................................................................................................................................ 16
Servicing the Primary Filter/Water Separator................................................................................................................... 16
Servicing the Fine Filter(s) ............................................................................................................................................... 17
Replacement Filter Chart ................................................................................................................................................. 18
Auto Water Drain (AWD) – If Applicable .......................................................................................................................... 18
Troubleshooting ................................................................................................................................................................ 19
Symptom Troubleshooting Guide..................................................................................................................................... 19
AXI International Limited Warranty.................................................................................................................................. 20

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Warranty Claim Procedure............................................................................................................................................... 21
Technical Assistance and Ordering................................................................................................................................. 22
Accessories and Additional Configuration Parameters .................................................................................................... 22
Replacement Filter Elements ........................................................................................................................................... 22
System Identification ........................................................................................................................................................ 22

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General Overview
STS 6000 P-35 | 7000 P-35 Specifications
Nominal Flow Rate……………………………………………..
35 GPM/2,100 GPH (132.5 LPM/7,949.4 LPH)
16,800 gallons (63,595 liters) per 8-hour shift
50,400 gallons (163,530 liters) per 24-hour shift
Primary Filter……………………………………………………
1, 5, 10, or 25Coalescing Filter Element
Secondary Filters……………………………………………….
1, 3, 10, or 25Fine Filter or 3, 10Water Block
Fuel Conditioner………………………………………………..
LG-X 4000 Inline Magnetic Conditioner
Plumbing………………………………………………………...
Black Iron
Inlet Port…………………………………………………………
1.5” NPT
Outlet Port…….…………………………………………………
1.5” NPT
System Enclosure……………………………………………...
NEMA 4 Rated Powder Coated or NEMA 4X Rated Stainless
Steel
Operating Temperature (6000 Series)……………………….
41 - 104°F (5 - 40°C)
Operating Temperature (7000 Series)……………………….
41 - 122°F (5 - 50°C)
Electrical………………………………………………………...
120V/60Hz/20A/1Ph
Timer…………………………………………………………....
Incorporated PLC-based timer
Maximum Fluid Viscosity……………………………………..
5 cSt
Outline Dimensions………………………………..…………..
»56” x 72” x 17” (142 x 183 x 43 cm) (H x W x D)
System Weight…………………………………………………
»404 lbs (183.3 kg)
*Note: It is the user’s responsibility to ensure safe operating conditions for the system to be ran.
!WARNING! This system is not meant for use with gasoline or any other flammable liquids having a flash point
less than 100°F (37.8° C). Use with gasoline or any flammable liquids at a temperature exceeding their flash point
presents an immediate explosion and fire hazard.

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System Components
Control and Safety Devices
•System Controller
oIncorporated PLC-based Timer
oMemory retention during power outages
oAlarm Indicator Light(s)
oControl Circuit Breakers (CB1, CB2)
oPump Control Selector Switch {Hand (Manual) / Off / Auto}
oAlarm Reset Push Button
oPump Running Indicator Light
oSystem Power Indicator Light
oEmergency Stop (E-Stop) Push Button
o6000 Series Controller:
§Smart Filtration PLC with LCD Display
o7000 Series Controller:
§HMI Touchscreen Control
•Water Detection Alarm Module
•Pressure Tranduscers
•Paddle-type Flow Switch
•Leak Detection Float Switch
•Inlet and Outlet Isolation Ball Valves
•Inlet Isolation Solenoid Valve
Fuel Conditioner
•Inline Magnetic Fuel Conditioner
Primary Filter/Water Separator
•Standard-issue 10coalescing filter cartridge (other filter elements available)
•Water Detection Sensor Probe
•Drain Valve
Secondary Filter
•Two standard-issue 3water block cartridge (other filter elements available)
Plumbing
•Black Iron
Multi-Tank Assembly – If Applicable
•External Straight Port Ball Valves
oEnables system to service multiple tanks
•Tank Fuel Level Float Switches (Customer provided)
Auto Water Drain (AWD) Assembly – If Applicable
•Accessory Pump
•Additional Water Detection Alarm Module
•Additional Water Detection Sensor Probe
•Solenoid Drain Valve

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•Basket Strainer
•Water Collection Drum
oHigh Water Level Float Switch
Manual Additive Injection – If Applicable
•System Ball Valve
•Additive Injection Port
•Injection Port Ball Valve
Auto Additive Injection Assembly – If Applicable
•Accessory Pump
•Flexible Suction/Return Lines
•Additive Injection Flow Sensor
•Solenoid Valve
•Additive Container
•Float Switch/Container Port Assembly

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System Operation
Apply control power to unit. Place control breakers (CB1, CB2) for the System Controller in the “ON” position.
Inlet Solenoid Operation
Automatic Mode:
Switch the system to “Auto” mode via the selector switch on the system enclosure. During the time intervals set up by the
user, the inlet solenoid valve will open and remain open until the scheduled runtime has ended. See the Controller section
for setting scheduled run times.
Note: The user must set the same runtime schedule for both the STS system and the submersible pump(s) in order to
polish the fuel and avoid a “No Flow” alarm.
Manual Mode:
Switch the system to “Manual” mode via the selector switch on the system enclosure. The inlet solenoid valve will open
and remain open until the system is switched off, into “Auto” mode, or an alarm has been tripped.
Alarms
Alarms featured on the system include:
•Leak Detection (system shutdown, alarm indication)
oActivated when the Float Switch in the system’s drip tray detects a raised liquid level. The system will go
into an alarm state and the pump will not be allowed to run until the alarm is addressed and cleared.
Note: Disposal of fuel and associated waste should be done in accordance with Federal, State and Local regulations.
•No Flow (system shutdown, alarm indication)
oActivated when the Flow Switch detects no flow during a scheduled runtime. Once the alarm debounce
timer is expired, the system will go into an alarm state and the Inlet Solenoid will not be allowed to open
until the alarm is addressed and cleared.
•High Pressure (system shutdown, alarm indication)
oActivated when the pressure transducer(s) detect a maximum or a differential pressure reading above the
factory set points. The system will go into an alarm state and the Inlet Solenoid will not be allowed to
open until the alarm is addressed and reset.
•High Water (system shutdown, alarm indication)
oActivated when water level trips the Water Detection Alarm Module via the Water Detection Sensor
Probes located on the Primary Filter.
•Auto Water Drain Float Switch (halts auto water drain functionality, alarm indication) – If Applicable
oActivated when the float switch on the Auto Water Drain’s Water Collection Drum is triggered due to a
high water level.
•Tank Overflow (system shutdown, alarm indication) – If Applicable
oActivated when one of the customer provided tank fuel level float switches is triggered due to a high fuel
level in one of the connected tanks of a multi-tank configuration.
Note: If the Pump Overload Alarm triggers, please contact AXI International.
Once triggered alarms are addressed, each alarm can be reset via the Alarm Reset button on the enclosure door panel.
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.

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Multi-Tank – If Applicable
1. From the Main Menu screen select “CONFIG”
2. Enter password (9999)
3. Enter the correct number of connected tanks in the box under “Number of Tanks”.
4. To see actual valve positions, select “VALVES”
a. Press the “Open” and “Close” buttons to manually test the valves. If the “Open” or “Closed” rectangular
box is GREEN, that status is active. The opposite is true if said background is RED.
5. Return to Main Menu screen
6. To control Pump in Manual Mode, turn the selector switch on the enclosure door to the “MANUAL” position
7. Select “MANUAL CONTROL” from the Main Menu screen
8. Select the desired tank for manual operation
9. Pump will run when valves have reached correct positions
10. To stop pump operation, select “Cancel Manual” or turn the selector switch on the enclosure door to the “OFF”
position
11. For automatic fuel cleaning, turn the selector switch on the enclosure door to the “AUTO” position
12. Select “AUTO TIMER CONFIG” from the Main Menu screen
13. Program the timer start and stop times for each tank.
a. Use the “Next” and “Prev” buttons in the bottom corners of the screen to navigate between timer screens
for the tanks
Note: Please ensure the start and stop times for any of the tanks do not overlap or an error message will be displayed.
!WARNING! Do not start-up or operate system without high fuel level alarms from both tanks tied into the control
panel. Frequently test overflow alarms for proper functionality and pump shutdown.
Auto Water Drain (AWD) – If Applicable
1. When the Primary Filter’s High-Water Sensor is triggered, the system will shutdown
2. The system will remain shut down for 60 seconds, allowing water to be completely separated from the fuel
3. After 60 seconds, the Auto Water Drain Solenoid Drain Valve opens and the Auto Water Drain Accessory Pump
turns on, draining the Secondary Filter’s housing
4. Once the water level has dropped below the Primary Filter’s Low-Water Sensor, the system automatically turns
back on and resumes normal operation
Manual Additive Injection – If Applicable
Note: Manual Additive Injection operation may vary depending on the vertical and horizontal distance between the
additive holding container and fuel polishing system.
1. With the system running, place flexible hose between the Additive Injection Port and Additive Container
2. Ensure sufficient additive is present in the container and that the flexible hose reaches the bottom
3. Open the Injection Port Ball Valve to begin injecting additive
4. To start or increase flow of additive into the system, slowly close the System Ball Valve to create a higher vacuum
as indicated on the vacuum gauge
5. Monitor the system’s vacuum gauge to avoid creating a vacuum higher than the system’s set point
Note: If a high vacuum alarm is triggered, return the System’s Ball Valve to the fully open position and reset the alarm by
pushing the Alarm Reset button on the enclosure door panel
6. Monitor the additive level in the holding container to gauge proper dosing
7. After injecting the desired amount of additive, close the Injection Port Ball Valve and return the System Ball Valve
to the fully open position

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Auto Additive Injection – If Applicable
1. To start Auto Additive Injection, navigate from the Main Menu to the Additive Injection screen on the HMI.
2. On the screen there are two fields to input information, Gallons to Treat and Treatment Ratio.
3. There are two other non-editable fields that show the last treatment date and also the amount of additive that was
added from the last treatment.
4. Enter the gallons of fuel to treat.
5. Then enter the treatment ratio (For example: 5 Gallon Jug of AFC treats 25,000 gallons of fuel, so enter 1:5000)
6. Once this information is entered, press the START button to begin the injection process.
7. There is a progress bar that will display the total amount of additive to be added (full red bar), and as the additive
is injected the red bar will decrease.
8. Once the bar is depleted, the process will stop.
9. If at any point the process needs to be manually stopped, press STOP on the screen.
10. After the injection is completed, the data is stored in the log, which can be accessed by pressing LOG on the
Additive Injection screen.
11. When the additive level reaches low, a “LOW ADDITIVE WARNING” will be displayed.
12. In order to run the process again, the additive must be refilled and the alarm reset by clearing all alarms.

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Primary Inspection
Upon arrival, the system and accessories must be visually inspected before installation. Improper handling during
shipping may cause physical or electrical problems. Immediately report or note any damages to the shipper.
Checklist
If the packing crate shows signs of damage inspect the system for damage.
Check the entire system for damage that could indicate internal mechanical or electrical problems.
Check all plumbing connections for tightness.
Check all electrical terminals and connections for tightness.

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Installation
Note: It is recommended that only qualified, experienced personnel, familiar with this type of equipment, who have read
and understood all the instructions in this manual should install, operate, and maintain the system.
Mounting
The unit should be permanently wall mounted on a hard, level surface. Use provided mounting holes located on the
enclosure for proper fastening (Refer to mechanical drawing(s) for Mounting Hole Diameter). Ensure the system is level
and secure, enabling water to be more accurately sensed in the Primary Filter Housing. Be sure to secure the system in a
location that allows all piping and electrical wiring to be safely routed to the system. This unit is designed for well-
ventilated outdoor and indoor use within the specified temperature range and should be located as close to the tank as
possible.
Electrical
!WARNING!: To avoid the risk of electric shock, make sure that the power supply to the system is disconnected
and ensure that the system is at zero volts, before working on any of the system’s electrical parts.
Make sure that the system’s power requirements and rated voltage/frequency match your electrical system (see wiring
diagram). The system may only be connected to properly grounded power sources for operator safety. Connect all
components to the ground studs provided as shown on the provided drawings.
!WARNING!: The whole system (enclosure, plumbing, electric sub panel) must be properly grounded for operator
safety.
Depending on length of run, use wiring according to specification in wiring diagram and connect system to a separate UL
listed breaker (not included) appropriate for branch circuit protection.
Note: Wiring and electrical installation must be in accordance with all applicable federal, state, and local rules, laws,
standards, and regulations.
Field Connections – If Applicable
Remote Monitoring – Dry Contacts:
The System Controller provides two Normally Open (N.O.) dry contacts for remote alarm monitoring. Please see wiring
diagram for contact rating, connection, and location.
1. “Summary Alarm” – dry alarm contact for high vacuum, high pressure, no flow, or water detection
2. “Leak Detection” – dry alarm contact for leak detection
Remote Shutdown – Interlocks:
The customer can provide interlocks connected to the System Controller in order to establish external shutdown
capabilities of the system’s pump.
Note: The 24 V DC provided by the power supply in the electrical box of the system must be used for remote shutdown.
Plumbing
Note: Please ensure to check all of the plumbing (joints, unions, miscellaneous fittings) for tightness prior to completion.
Also, do not put any stress on plubming of STS 7000-P35 and use a backing wrench when connecting external plumbing
to the system.

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Use proper quality approved fuel line materials with similar inner diameter (ID) to the inlet/outlet of the system. For
extended suction side plumbing runs, it is recommended to install oversized pipe, (1/4” to 1/2” increased ID).
Note: Flexible plumbing is strongly recommended for system inlet and outlet connections to external plumbing in order to
avoid issues with thermal expansion, prevent putting any stress on the internal fittings of the system, and enable ease of
maintenance/installation.
The supply line(s) should originate from the lowest point of the tank to ensure all water is removed. Also, it should be
connected directly to the system’s inlet port (located on the left-hand side of the system)
The return line(s) should be plumbed to the system’s outlet port (located on the right-hand side of the system) and enter
the tank as far as possible away from the pick-up tube, close to the tank bottom.
Multiple supply and/or return lines may be connected to a manifold outside the system.
Note: Anti-Siphon or other external plumbing devices may be required by state and/or local regulations & code. Also,
plumbing installation must be in accordance with all applicable federal, state, and local rules, laws, standards, and
regulations.
Note: Additionally, if the system must share a fuel oil supply (FOS) line with a generator, we recommend check valves be
installed after the split in the line, before the landing/entrance into the generator tank and the fuel polishing system. Also, it
is highly recommended that the “External Shut Down” contacts on the PLC are utilized as well in this scenario.
Typical Plumbing Installation (Schematically)
See provided P&ID drawing(s).
Important Installation Precautions
The supply line of the system should be independent and separate from the supply line of the engine. If that is not
possible, appropriate valves must be installed to completely separate the system from the engine’s fuel system to prevent
any possible interference with safe engine operation (please see note(s) above).
Also, it is highly recommended to plumb the discharge line independent and separate of the engine’s fuel return line back
to the tank. If the return line from the engine and the discharge line of the system must be combined in any way, adequate
valves should be installed to prevent any possible interference with safe engine operation.
Multi-Tank Installation – If Applicable
Please connect each tank’s dedicated supply and return lines according to the provided drawings. Use approved flexible
lines to avoid issues with thermal expansion, prevent putting stress on plumbing connections, and enable ease of
maintenance/installation. Additionally, please be sure to plumb each supply and return ball valve in parallel (on separate
lines) leading to their respective tank(s). See the provided P&ID drawing for more information.
Ensure all external electrical connections are linked to their corresponding ball valve as indicated by labels on the sides of
the system’s enclosure.
The provided external High Tank Fuel Level Alarm Inputs (see provided electrical drawings) must be wired to the Normally
Closed High Level Alarm Contacts on each tank to avoid overfilling and potential spills. This is a very important safety
feature that will close the fuel polisher Inlet Solenoid Valve in case a tank reaches an unsafe fuel level.

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Controller
Setting the Current Date and Time (6000 Series Controller)
•Please make sure the selector switch is set to “OFF” and push the Alarm Reset button on the enclosure door
panel.
•When power is first applied to the system, the display of the PLC will show (blinking) the date and time.
•Hit the “ESC” button.
•Select ‘Stop’ and press “OK”.
•Select ‘Yes’ (use down arrow key) and press “OK”.
•Select ‘Setup’ (use down arrow key) and press “OK”.
•Select ‘Clock’ and press “OK”.
•Select ‘Set Clock’ and press “OK” (must be in military format).
•Using the arrow keys, set the current day of the week, time and date as indicated in the display and press “OK”.
Use the up and down arrow keys to change values, and use the left and right arrow keys to change between
week, day, time, and date.
•When finished entering press “OK” to confirm.
•Press “ESC” until the base menu is displayed.
•Select ‘Start’ and press “OK” – correct time and date should be displayed (when prompted, select “YES” to
proceed).
Programming the Timer (6000 Series Controller)
1. Hit the “ESC” button from the time and date display. If they are not shown, hit the down arrow button until they are
displayed.
2. Select ‘Program’ and press “OK”.
3. Select ‘Set Param’ (use arrow keys) and press “OK”.
4. Use the arrow key to select the ‘Timer’ and Press “OK”.
5. Use the arrow keys to select the desired field and press “OK” to edit.
6. Use the left and right arrow keys to select the day/days of the week the system should automatically turn on, and
the up or down arrow key to activate the selected day.
7. Use the arrow keys in same manner to program the ‘On’ time for when the system will switch on (on the selected
day/days).
8. Use the arrow keys in same manner to program the ‘Off’ time – when the system will switch off.
9. Press “OK” to confirm the entry when finished setting all desired parameters.
10. If required, you can set up to 3 Timers by using the up and down arrow keys.
11. Press “ESC” until the time and date screen is displayed.
Setting the Current Date and Time (7000 Series Controller)
1. Please make sure the pump is set to “OFF”.
2. On the home screen, long-press (for a few seconds) to the right of the AXI logo until a new screen appears.
3. Select ‘Enter Info Mode’.
4. Once prompted, enter ‘1111’ for the password.
5. Select ‘Time and Date’.
6. Select and set the current time and date in military format.
7. Once finished, continually press ‘ESC’ until you are returned to the home screen. The updated information should
be shown in the header of the touch screen pages.
Programming the Timer (7000 Series Controller)
1. From the home screen, select ‘Auto Timer Config’.
2. Once on the ‘Timers’ screen, you can set up to 1 run timer for each day of the week.

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3. To set up a runtime simply enter a ‘Start’ and ‘Stop Time’ (using military format) in one of the timer boxes for the
desired weekday.
4. To toggle between tanks (if applicable), simply press the available buttons on the bottom left or right hand side of
the screen.
Touchscreen Menu Structure (7000 Series Controller)
Modbus TCP/IP Communication (7000 Series Controller)
Setting up the IP Address:
1. From the Main Menu, press the “CONFIG” button.
2. Input “9999” and press the enter key (“¿”).
3. Push “IP Config” and continue onto the next page.
4. Enter the desired values for the PLC IP Address, PLC IP Mask, PLC IP Gateway, PLC Remote IP,
and Network ID.
5. Power cycle the touch screen HMI/PLC.
Note: When communicating via Modbus TCP/IP (Port 3 – Ethernet Cable Slot), the PLC Remote IP and Network ID do not
need to be utilized for the proper functionality.
Home
Screen
Alarm
History Alarms
Groups
w/Pending
Alarms
Alarms In
Group
Alarm
Detail
Auto Timer
Config. Help Manual Control Config.
Password
"9999"
Config.
Menu
Clear
Totalizer
Clear
Alarm
History IP Setup Valves
Filter
Control

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Commissioning/Initial Start-Up
Gauge Venting
After shipment, gauge pointers may not rest at zero due to internal case pressure build-up, which is caused by
temperature and/or pressure variations. As a result, their accuracies may be significantly reduced. To restore the gauges
to operating condition, move the yellow lever of the fill plug to the open position or remove the black rubber piece from the
top of the gauge and leave it open to vent.
Initial Test Procedures
With breakers and power turned on, and the system in manual mode, check all alarms for proper operation:
•Leak Detection - Manually raise the float switch located at the bottom of the leak-basin. The Inlet Solenoid Valve
should close 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 Pressure Alarm – With the pump running and the suction side to the system unimpeded, slowly, partially
close the outlet ball valve. The Inlet Solenoid Valve should close and a “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.
!WARNING!: Please ensure that an alternate path is routed from the pump, so when the inlet solenoid valve is
closed, the pump is not “dead-headed”.
•Water Sensor - Jump the Water Detection Sensor(s) by unplugging the electrical spade connectors between the
water sensing module(s) and the water detection probes and placing a conductor across the spades from the
water sensing modules. The Inlet Solenoid Valve should close after 10 seconds and a “High Water Alarm” should
be indicated on the System Controller/Enclosure. Remove the conductor(s), reconnect the spades as they were
originally configured, 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 and water sensing
modules on the primary filter. Please refer to the AWD section in this manual for additional information.
•No Flow Alarm – With no pump(s) running, switch the system into Manual Mode via the selector switch on the
enclosure door panel. After 15 seconds of no flow, the Inlet Solenoid Valve should close and a “No Flow Alarm”
should be indicated on the System Controller. Switch the system to Off or Auto Mode and reset the alarm by
pushing the Alarm Reset button on the enclosure door panel.
•Auto Water Drain Float Switch (If Applicable)- Manually raise the “HIGH” float switch located on the Auto
Water Drain’s Water Collection Drum. An alarm should be indicated on the System Controller. Reset the alarm by
pushing the Alarm Reset button on the enclosure door panel.
•Tank Overflow (If Applicable)– Manually raise the “HIGH” float switch located on each of the connected tanks.
The Inlet Solenoid Valve should close and the “Tank Overflow” alarm should be indicated on the System
Controller. Reset the alarm by pushing the Alarm Reset button on the enclosure door panel.
Note: If any of the above described alarm test procedures fail or if any alarm trip value deviates, immediately contact AXI
International.

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Maintenance
The system should be visually inspected and tested a minimum of every six (6) months according to the
procedure below during light duty cycles. Monthly inspections are recommended for systems that are being used
in excess of an average of eight (8) hours a day and five (5) days a week.
Preventative Maintenance
Prior to performing the maintenance procedure ensure that:
1. The electrical sub-panel mounted main disconnect switch is operating properly.
2. The user supplied remote circuit breaker is in the “OFF” position.
3. All sources of power are isolated from the unit.
Note: Proceed only after this has been verified and properly tagged.
4. Drain visible water and sediment from the primary and secondary filter (see Servicing Primary/Secondary Filters).
5. Check system and all parts for corrosion and rust.
6. Check mounting hardware – tighten as necessary.
7. Check bolts on the pump/motor hardware for tightness, as pump/motor hardware can loosen after normal
operation for extended durations of time, due to vibration.
8. The hardware uses lock nuts – check all bolts for secure nuts.
9. Check all electrical terminals and connections for tightness.
10. All motors are permanently lubricated and do not require any lubrication.
11. Check all plumbing joints for leaks, tighten fittings and joints as necessary, and remove accumulated fuel in leak-
basin as necessary.
12. Inspect all filter(s).
Note: All filter elements should be replaced at least every six (6) months.
Servicing the Primary Filter/Water Separator
Clogged filter elements restrict the flow of fuel, resulting in the system’s pressure gauge(s) indicating a pressure spike.
The gauge is mounted between the pump and the fine filter. At a maximum pressure of 44 PSI or at differential
pressure(s) of 22 PSI across the filtration housings, the pump will automatically shut off and generate a High Pressure
Alarm. This signal indicates that it is time to change the filter element(s).
Changing the Primary Filter Element:
1. Turn the enclosure door panel selector switch to the “OFF” position – making sure the pump will not turn on.
2. Close the inlet and outlet ball valves.
3. Place an appropriate container underneath the filter.
4. Open the drain valve at the bottom of the filter housing to allow all fluid to drain from the filter.
5. Open the vent valve on the cover of the filter housing to allow the unit to vent thoroughly before opening.
6. Loosen the 4 knobs on top of the filter housing.
7. Remove the head gasket and expended filter cartridge and discard in accordance with local and national
regulations.
8. Flush the interior of the housing with clean, processed, filtered product or a suitable solvent. A non-metallic bristle
brush may help to remove caked debris. Rinse the housing and unit cover with a clean solvent and dry with soft,
lint-free wiping cloths.
9. Lightly lubricate new head gasket with Vaseline or Petroleum Jelly and position it on the head. If Vaseline is not
available, lubricate the gasket with the fuel or oil it will be used in.
10. Insert a new filter cartridge into the housing.
11. Position the housing with cartridge underneath the filter head. Push and twist the cartridge into the head spigot.
The head “conical spring” will seat/seal the cartridge in the housing.

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12. Rotate the filter housing into the collar bolts and hand tighten the knobs until the head is “snug” to the housing.
Note: A torque wrench is recommended. Tighten all collar bolts to 100 in lbs.
13. Close the drain valve at the bottom of the filter housing.
14. SLOWLY, open the inlet and outlet ball valves to allow the unit to fill completely.
15. Leave the vent valve on the top of the housing open to allow air to escape while the unit completely fills.
16. When a small amount of fluid flows out of the vent, close the vent valve tightly.
17. Push the Alarm Reset button on the enclosure door panel to acknowledge the alarm and reset it.
18. Return the selector switch on the enclosure door control panel to its original position.
19. During the initial filling, after the above maintenance is performed, and while the unit is in operation, examine the
housing and all connections for leaks (including head/flange junction).
20. Check for leaks when re-starting and pressurizing the system.
Servicing the Fine Filter(s)
Clogged filter elements restrict the flow of fuel, resulting in the system’s pressure gauge(s) indicating a pressure spike.
The gauge (specific to the fine filters) is mounted between the pump and the fine filters. At a maximum pressure of 44 PSI
or at differential pressure(s) of 22 PSI across the filtration housings, the pump will automatically shut off and generate a
High Pressure Alarm. This signal indicates that it is time to change the filter element(s).
Changing the Fine Filter(s):
1. Turn the enclosure door panel selector switch to the “OFF” position – making sure the pump will not turn on.
2. Close the inlet and outlet ball valves.
3. Place an appropriate container underneath the filters.
4. Remove the old spin-on filters with a filter wrench by turning the catridges counter-clockwise (CCW), seen from
the bottom of the enclosure.
5. Apply a film of lubricating oil to the gasket of the new filters.
6. Screw the new filter canisters to the filter head until the gaskets are tight and secure (rotate the elements an
additional 0.5-1.0 turn after the filters make contact with the gaskets).
7. Open the inlet and outlet ball valves.
8. Push the Alarm Reset button on the enclosure door panel to acknowledge the alarm and reset it.
9. Return the enclosure door panel selector switch to its original position.
10. Check for leaks when re-starting and pressurizing the system.
Note: Disposal of fuel, associated waste, and filters must be in accordance with all applicable federal, state, and local
rules, laws, standards, and regulations.
!WARNING!: Some fuels may have been treated with biocides. Biocides are extremely toxic and may enter the
body through the skin. It is recommended to use adequate protection and proper precautions if the fuel at-hand
contains biocide type products.

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Replacement Filter Chart
STS SERIES FILTERS
All Filters are absolute, unless otherwise noted | wb: waterblock | SS: Stainless Steel Screen
Primary Cartridge Filters
1µ
5µ
10µ
25µ
WATER SEPARATOR
FBO-60336
FBO-60337
FBO-60356
FBO-60338
SPIN-ON Filters
3µ
10µ
25µ
3µX-Glass
ParTICULATE
FF-3
FF-10
FF-25
FFz-3
Water Block
WB-3
WB-10
Auto Water Drain (AWD) – If Applicable
Servicing Auto Water Drain Strainer:
1. Turn the enclosure door panel selector switch to the “OFF” position – making sure the pump will not turn on.
2. Close the system’s Inlet and Outlet Isolation Ball Valves.
3. Place a fuel waste container below the strainer and Manual Drain Port.
4. Ensure the AWD’s Isolation Ball Valve is closed by opening the Manual Drain Port.
5. Open the bleed screw on top of the Filter Housing to break vacuum.
6. Remove and clean the AWD’s strainer.
7. Reattach and secure the strainer to the AWD assembly.
8. Continue to “Servicing Water Collection Drum”.
Servicing Water Collection Drum:
1. Keep a fuel waste container below the Manual Drain Port (Please see Step 3).
2. Remove the Float Switch from the Water Collection Drum.
3. Properly dispose contents of the Water Collection Drum in accordance with the proper AHJ.
4. Replace the Float Switch to its original state on the Water Collection Drum.

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Troubleshooting
Symptom Troubleshooting Guide
No fuel delivery
1. Pump does not run
2. Pump is not primed
3. Fuel supply line blocked
4. Excessive lift
5. Air leak in fuel supply to pump
6. Intake or outlet valve closed
7. Check valve installed backwards
Insufficient fuel delivered
1. Air leak at inlet
2. Defective pressure relief valve or check valve
3. Excessive lift
4. Pump worn
5. Inoperative foot valve
6. Piping improperly installed or dimensioned
7. Wye-Strainer plugged
Rapid pump wear
1. Worn pump/motor coupler
2. Pump has been run dry or with insufficient fuel
for extended periods of time
3. Plumbing on inlet side not appropriately
dimensioned
Alarm “HIGH PRESSURE ALARM” comes on with
clean or new filter element installed
1. Heavily contaminated fuel/excessive water in tank
2. Restriction in plumbing on discharge side too high
3. Head on discharge side too high
4. Check valve stuck or defective
5. Check valve installed backwards
6. Outlet ball valve not fully open
7. Discharge line clogged
Pump requires too much power
1. Liquid too viscous
2. Bent pump shaft, binding rotor
3. Misalignment of pump/motor coupler
Alarm “NO FLOW ALARM” comes on or pump requires
frequent re-priming
1. Inoperative foot valve
2. Inoperative check valve
3. Inoperative solenoid valve
4. Pump cavitation
5. Plumbing air leaks
6. Lift too high
7. Leaking pump seal
8. Pump’s internal bypass/pressure relief valve
cracking pressure is under 48-50 PSI.
Motor does not turn or turns intermittently
1. Control power not available
2. Supply voltage is too low and/or incorrect
3. Motor thermal overload condition
4. Pump failed and seized
5. Motor failure
Pump leaks fuel
1. Loose pump plumbing fittings
2. Worn pump shaft seal
3. Pump pressure relief valve failure
4. Fuel leak elsewhere and fuel dripping or running
towards the pump
5. Excessive head from overhead storage tank
6. Worn pump O-rings or seals
Note: The pump and motor assembly (as well as other ancillary plumbing/piping items such as foot or check valves) are
generally not provided by AXI International. Therefore, AXI International does not assume responsibility for products
provided by other vendors.