Trident Emergency Products, LLC
2940 Turnpike Drive | Suite #9 | Hatboro, PA 19040 USA
14
AirPrime
™ Fire Pump Priming System
™
Trouble Shooting Guide
Problem
Likely Cause
Corrective Action
System
Does Not
Hold Vacuum.
• Master Drain Valve Open.
• Discharge or Intake Valves Open.
• Bleeder or Drain Valves Open.
• Relief Valve Drain Open.
Double check all drains, discharge and intake valves to make sure all of them
are closed.
Intake Relief Valve Allowing Air Into
Pump System.
For conventional
intake relief valves only.
Procedure
differs when using an AirMax
™
valve.
a) Adjust intake valve to closed position (be careful to count the number of
turns to close and re-open the same number of turns).
b) Cap the discharge side of the intake relief valve (NPT or NH).
Be sure to remove cap after testing.
AirPrime Exhaust Outlets Drawing
Back Vacuum.
The integral priming valve is not closing all the way, air is moving upward into
the barrels, into the pump, as the water falls back into the hard suction hose to
the water level or as vacuum is lost through the fire pump system.
System
Will Not
Reach 22" Hg.
Inadequate Air Supply.
a) Check the CFM rating of the engine air compressor.
See Page 4
.
b) Check air pressure at “supply” side of AirPrime (should be over 70-PSIG/
[3�8 Bar]
). Install a tee and air gauge in input for test purposes. If the air
pressure is not the same as the cab dash air pressure gauge, check for
under sized airline, kinks or obstructions in air line, or air line is too long. Air
line length should be less than 20 ft
[6 m]
from primary storage tank.
Pressure Protection Valve.
c) Check Pressure Protection Valve air on/off settings (should shut-off in the
60 to 80-PSIG /
[4�2 to 5�5 Bar]
range) and OPEN no higher than 80-PSIG /
[5�5� Bar]
to the AirPrime supply.
Air filter on intake side of air supply
connection to AirPrime body.
For details on filter inspection/
replacement visit/scan QR codes at right�
a) Manual AirPrime: Remove air supply piping, remove fine mesh filter, clean
or replace. Part#: 21.002.0.
b) Automatic AirPrime: Remove air supply piping, remove air solenoid
assembly, remove fine mesh filter, clean or replace. Part #: 21.002.0
Slight air leak in discharge or intake
valves in fire pump plumbing.
c) Hydrostatic test the plumbing system to the NFPA #1901 standard with wet fire
pump & closed valves: 250-PSIG
[17�2 Bar]
for 10 minutes without pressure loss.
Check the interior check valves
inside the primer.
Remove and disassemble primer to inspect the three (3) small internal rubber
check valves to the venturi orifices.
Check the interior primer body
venturi nozzles for foreign material
or blockage.
Remove and disassemble primer to inspect the three (3) internal venturi nozzle
openings or clean with small wire to assure open orifices.
Defective Primer.
Replace or rebuild primer with Kit #27.003.3.
See Instructions Here
AirPrime
Leaks
Water.
Check the AirPrime integral priming
valve.
a) The priming valve is not seating in the shut-off position: Remove primer,
disassemble, and check the priming valve spring, seat and operation.
b) The priming valve is “stuck”, check for damaged O-Ring or check to see if
piston is fully threaded on the valve stem.
Manual System
:
Air continues to
flow when button
is released.
Bad manual Push Button valve.
Push Button air plumbing installed
incorrectly.
Replace the Push Button with a new valve, Part #27.003.1.
Note
:
It is
recommended that the Push Button Control be depressed regularly to exercise the
spring and seals. The fire pump does not have to be engaged during this process.
Refer to air schematic drawing, Figure 14 on Page #8 of this manual.
Auto System
: Air
continues to flow
when button is
released.
Panel switch inoperable.
Air solenoid on top of primer is
defective.
Solenoid is on backwards.
Refer to parts list on Page 16, order replacement switch, Part #27.003.2.
Refer to parts list, order replacement solenoid, Part #30.003.0 (12 Volt) or
#30.003.1 (24 Volt).
Reverse orientation of solenoid on top of manifold. Ports on solenoid and
manifold should be on the same side.
Visit
for additional AirPrime information.
Filter Info
Manual
Kit 27.003.3
Instructions
