P
The Leader in Nitrogen Generation Technology
FPS-900 O&M Manual
Revision: 2; 7/2020
Page 22 of 29
9. Maintenance
WARNING: Whenever doing any maintenance on the system, make sure to power down the
system. Remove the front cover to gain access to the filters.
Note: Annual Filter replacement kit part # FRP-007
9.1. Air Pre-Filter
The integrated air compressor, of the
N
2
-BLAST
®
FPS-900, has an air intake pre-filter. It prevents
particles from entering the compressor housing and damaging internal components. Replace this
filter once per year or every 1000 hours, whichever comes first. To do so, remove the pre-
compressor filter cap by twisting it clockwise. Remove the old element and use a clean dry cloth to
clean the filter bowl before installing the new element.
9.2. Air Filter replacement
The particulate and coalescing filters, after the air compressor, are designed to capture particulate
and moisture prior to entering the rest of the system. These filters need to be replaced once per year
or every 1000 hours, whichever comes first.
Follow these instructions to replace filters:
1. Turn off the unit and open the front cabinet door.
2. Locate the air filters on the bracket in the middle of the cabinet. See
Figure 7
.
3. Make sure the filters are completely depressurized by checking the pressure gauge.
4. Remove two filter bowls. Do so by turning them counter clockwise.
5. After removing the filter bowls, rinse debris out of the bowls with warm water.
6. Dry the bowls with a clean dry cloth and replace old O-rings with the ones with the kits.
7. Change the filter elements:
a) Particulate Element - Pull the plastic element housing out of the filter bowl. Twist off the
black plastic cover and pull off the particulate element. Install the new element in the
reverse order.
b) Coalescing Element - Twist the coalescing element counter-clockwise. Install the new
element in the reverse order.
8. After replacing all elements and O-rings and cleaning the bowls, install the bowls back to their
corresponding filter housings.
9. Reset the controller filter alarm by pressing the down (-) button. Hold for 7 seconds. See pages
15-16 for more details on the location or function of resetting the filter alarm.
After replacing the filters, put front cover back on and power on the unit. Once powered up, the air
compressor will turn on and start producing nitrogen. Check the filter bowls for leaks.
