Troubleshooting - Graco EcoQuip 2 EQs Series Instructions Manual

Troubleshooting

Problem
Unable to fill or
pressurize the pot with
water.
3A7467D
Cause
The emergency stop
(Q) is engaged.
The air supply is
inadequate.
Inadequate water
supply to the pump.
The water pump air
regulator is
malfunctioning.
The water pump is
malfunctioning.
The pot seal plunger
cannot seal.
The water pressure
regulator is
malfunctioning.
Disengage the emergency stop (Q).
Make sure the air compressor is capable of suppling the minimum
air flow requirements for your system. See Technical
Specifications, page 64. Make sure the air inlet pressure gauge
reads 100-175 psi (6.8-12 bar, 0.68-1.2 MPa). If the gauge does
not read 100-175 psi, check the air compressor for proper setup.
Make sure the air inlet filters are clean, and replace if necessary.
Systems with water tanks: Make sure the water tank is full and
the inlet ball valve is open. Clean or replace water inlet filter if
necessary. Make sure all fittings connections are tight.
Systems with pressurized supply connections: Ensure water
supply connection is connected and pressurized. Check that water
supply meets appropriate pressure and flow requirements. Ensure
all fitting connections are tight. Check inlet water pressure
regulator for proper flow direction installation.Check inlet water
pressure regulator screen filter for debris, clean if possible.
Replace regulator if no flow can be passed through regulator.
Disengage the blast control switch (B). Adjust the pump inlet air
pressure regulator until the pump air pressure regulator gauge
reads 100 psi (6.9 bar, 0.69 MPa). If you are unable to attain this
setting, check the air inlet filters and make sure the supply air
pressure is greater than or equal to 100 psi. If the above steps do
not resolve issue, replace the pump air pressure regulator.
Rotate 3-way selector valve to OFF position. Open rinse valve and
ensure pump cycles, and water flows from rinse hose. Close rinse
valve and verify that pump stalls. If pump continues to creep or will
not prime, refer to manual 333397 for pump service.
Make sure the pot seal plunger is clean and free of debris in the
o-ring sealing area. Check for proper pot seal plunger alignment in
the closed position (there should be no gaps between the o-ring
and the pot seal plunger). Remove the o-ring and make sure the
o-ring gland is clear of debris. Replace the o-ring and /or pot seal
plunger if worn.
Adjust the water pressure regulator until the pot pressure gauge
reads 185 psi (12.75 bar, 1.275 MPa). If this adjustment is not
possible, service the water pressure regulator. Refer to your
regulator manual. See Related Manuals, page 3.
Troubleshooting
Solution
29