332312A - E4-5 Meter-Mix Dispense System, Operation ... - Graco Inc.

Pressure Relief ProcedurePressure Relief ProcedureThis equipment stays pressurized until pressure ismanually relieved. To help prevent serious injury frompressurized fluid, such as skin injection, splashingfluid and moving parts, follow the Pressure ReliefProcedure when you stop spraying and beforecleaning, checking, or servicing the equipment.There are two ways to relieve pressure of the system.Dispense Head SolenoidPerform the procedure if the dispense head can flowmaterial freely.1. Press the “Stop Pump” button the “Monitor Screen”while the machine is energized and the controlpower button is illuminated.Bleed Ball ValvesPerform the procedure if the dispense head is pluggedor there is no air to actuate the dispense head solenoid.1. Press the stop button on the front of the machine.2. Place a waste container below each Bleed BallValve.3. Open both Material Ball Valves.2. Open both Material Ball Valves.3. Press and hold the solenoid override button to openthe dispense valve for the “A” material side.4. Release the solenoid override button once the analogpressure gauge reads 0 psi.5. Repeat steps 3 through 4 for the “B” material side.“A” SolenoidOverride“B” SolenoidOverrideIn the following step, any pressure in the lines will beinstantly relieved if no obstructions are within thelines. This may lead to material spraying out of thevalve and splashing in the bucket. Use appropriateprotective wear to prevent contact with materials.4. Open the “A” Bleed Ball Valve. Residual pressurewill be relieved in the fluid lines between the pumpand the check valve.5. Verify the analog pressure gauge reads 0 psi.“A” MaterialPressure Gauge“B” MaterialPressure Gauge“A” MaterialPressure Gauge“B” MaterialPressure Gauge6. Repeat for the “B” Pump Bleed Valve.332312A 33