Graco Dispensit 792-20 [5/14] Operating procedures

OPERATING PROCEDURES

DRY SYSTEM CHECKOUT

This is an initial checkout to determine if the setup has been properly completed.

Conduct the dry system checkout without any material in the system.

1. Attach the color-coded pneumatic pressure line from the air inlet fitting on the valve to the color-coded

cycle air outlet on the air supply controller.

2. Turn on the electric and air supply.

3. Set the air pressure to 70 psi (4.8 bar) on the system pressure gauge.

4. In the normal rest position the Pinch-off Piston (11) is held back by the Springs (10), sealing the

Material Hose (18).

5. Momentarily press the dispense valve cycling control switch. The Pinch-off Piston (11) is pressurized

to release the Material Hose (18). The controller air solenoid valve should cycle and cause a slight

fluctuation in the system pressure gauge. When this happens, the system is correctly installed.

MATERIAL LOADING

REMOTE MOUNTED MATERIAL SUPPLY

Connect the Material Hose either directly to the material supply reservoir or to material supply tubing that

connects to the material supply reservoir. When using a remote reservoir, the material supply tubing and

fittings must be compatible with the material being dispensed and be capable of withstanding the

dispensing pressure.

Warning: Do not exceed 100 psi (6.9 bar) pressure on the operating system or 60 psi (4.1 bar) material

supply pressure. Higher pressures are not required and may cause a serious hazard.

WARNING: Do not apply either operating or reservoir air pressure to the product unless all screws are in

place and properly tightened, and the receiver cap and/or reservoir lid is properly in place and tightened.

All air connections should be fastened securely.

WET SYSTEM CHECKOUT

Using the purge cycle on the air supply controller, run the material through the dispense line until a

smooth material flow is observed through the dispensing outlet.

After the purge cycle has been completed, set the air supply controller to the manual cycle mode and

cycle the Dispense Valve several times.