• Master Drain Valve Open.
• Discharge or Intake Valves Open.
• Bleeder or Drain Valves Open.
• Relief Valve Drain Open.

Intake Relief Valve Allowing Air Into Pump System.

AirPrime Exhaust Outlets Drawing Back Vacuum.

Double check all drains, discharge and intake valves to make sure they are all closed.

1. Adjust intake valve to closed position (be careful to count the number of turns to close and re-open the same number of turns).
2. Cap the discharge side of the intake relief valve (NPT or NH). Remove cap after testing.

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.

Inadequate Air Supply.

Pressure Protection Valve.

Air filter on intake side of air supply connection to AirPrime body.

Slight air leak in discharge or intake valves in fire pump plumbing.

Check the interior check valves inside the primer.

Check the interior primer body venturi nozzles for foreign material or blockage.

Defective Primer.

Check CFM of air compressor on engine. See Page 4 of AirPrime Manual.

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 if the air line is too long (Must be under 20 ft [6 M] from primary tank.

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 AirPrime supply.

1. Manual AirPrime: Remove air supply piping, remove domed mesh filter, clean or replace.
2. Automatic AirPrime: Remove air supply piping, remove air solenoid assembly, remove domed mesh filter, clean or replace.

Hydrostatic test the plumbing system to NFPA #1901 standard with wet fire pump and closed valves: 250-PSIG [17.2 Bar] for 10 minutes w/ pressure loss.

Remove and disassemble primer to inspect the three (3) small rubber check valves to venturi orifices.

Remove and disassemble primer to inspect venturi nozzle openings or clean with small wire to assure open orifices.

Replace or rebuild primer with Seal Kit #27.003.3.

Leaking air into the plumbing system.

Low air pressure.

Pressure Protection Valve.

Check wye strainer on intake from fire pump, could be clogged.

Check air line to the AirPrime primer.

Check discharge and intake valves.

Check gated Master Intake Valves on suction intakes.

Check the AirPrime integral priming valve.

Suction lift to high.

Blocked suction strainer.

Leaking suction hose connections.

Air trap in suction line.

Double check all drains, discharge and intake valves to make sure they are all closed.

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 reading is not the same as the cab dash air pressure gauge, check for an under sized airline, kinks or obstructions in air line. Or the air line may be too long (Must be under 20 feet [6 M] from primary tank).

Check Pressure Protection Valve air on/off settings (should shut-off in 60 to 80-PSIG / [4.2 to 5.5 Bar] range) and OPEN no higher than 80-PSIG / [5.5 Bar] to AirPrime.

1. Remote primer installation: The line from the fire pump to the AirPrime has a wye type strainer just before connecting into the primer body. Remove the plug, then strainer, and clean the strainer of debris, reinstall strainer and plug.
2. Direct mount on Hale pump installation: Remove the primer from the Hale fire pump, check the black plastic strainer (Supplied by Hale).

The air supply line from the air tank is either “kinked”, undersized or over length. Replace air line accordingly (Note: Found mainly on new installations).

Cap or plug the discharge and intake valves to prove the valves are not leaking air into the plumbing system (Hydro-static pump test is useful for such testing).

1. Remove the MIV and cap intake.
2. Install a cap on the discharge side of the relief valve.
3. Cap the Storz or NH intake.

1. The priming valve is not seating in the shut-off position, remove primer, disassemble, and check the priming valve spring, seat, and operation.
2. The priming valve is “stuck”, check for damaged O-Ring or check to see that the piston is still fully threaded on the valve stem.

Do not attempt lifts exceeding 24 feet [7.3 M].

Remove any obstructions or debris from hose strainer, do not allow suction hose or strainer to rest on the bottom of water supply.

Clean and tighten all suction hose connections, check hose washers and replace as necessary.

Suction hose should be positioned with a constant decline to the water supply.  If a trap is unavoidable, repeated priming may be required to eliminate air pocket.

Not priming from highest suction plumbing point.

Remote Priming Valve not opening.

Water trap in RPV line.

Check suction plumbing elevations, shown on bottom of Pages 10 and 11 of the AirPrime Manual. Check for changes in suction high point when truck is drafting on an incline.

Defective RPV, defective panel push button, check system plumbing using schematics on Page 10 (Automatic) Figure 16 and Page 11 (Manual) Figure 17 in the AirPrime Manual.

Lines must ascend from highest suction plumbing points to RPV(s) for natural drainage and to avoid water traps.