Graco 288400 important safety instructions Hose Heat System

and an off-ratio condition will result. This malfunction will appear almost identical to cavitation, but somewhat less severe.

4.Pilot Valves - Check each valve for proper operation. If either valve is defective or damaged, replace both valves.

5.Damaged Piston Packing - Check piston packing set for mars or scoring. Replace piston packing set if damaged.

6.Air Motor Assembly - Check air motor cylinder and lubricate if necessary. Also, check o-rings and seals for wear and/or damage. Replace if necessary.

Hose Heat System

Problems

To avoid unnecessary repairs, try the recommended solutions in the order given for each problem. Before assuming there is a problem, determine that all circuit breakers, switches, and controls are properly set.

Problem	Solution
Hose warm but does not reach temperature	1,2,5,6,7
or takes too long to reach temperature.
Hose does not heat; Light on.	2,3,4,7
Hose Heat Circuit Breaker trips or fuse	2
blows.
Hose temperature not maintained during	1,2,5,6,7
flow.
Hose or hoses adjacent to the unit are warm	4
- hoses downstream are cold.

Troubleshooting

Solutions

1.Hose Length - The hose heat system of the Predator is designed to maintain the chemical temperature developed by the primary heaters with up to 310 feet of hose. (Hose lengths greater than this require the use of an auxiliary hose heat system. Call Graco-Gusmer for details). In addition, if ambient temperature is too cold, the hose circuit may not have enough power to maintain the chemical temperature.

2.Hose Heater Power Control - Ensure that the power control is adjusted until the ammeter reads 15 amps (do not exceed 15 amps).

3.Hose Heat Fuse - With the main power OFF and locked out at the source, remove the fuse and check it for continuity or simply replace it with a new one.

Replace the fuse with one of the same rating. A substi- tute may damage the equipment and would create a potential source of injury to the operator.

4.Hose Heating Element - With the hose heat circuit breaker OFF, check to see that the Power-Lock connectors on the hoses and all electrical connections between the hoses and unit are tight. If these connections are secure and hose heat is not present, perform a systematic search for the electrical fault. To search for the electrical fault, proceed as follows:

a.With the hose heat circuit breaker OFF and the power control turned fully counterclockwise, starting at the gun whip, unplug the Power-Lock connectors and plug the hose troubleshooting jumper plug (included with accessory package) into the last “upstream” segment of hose.

b.Turn ON the hose heat circuit breaker and turn the hose heater power control (clockwise) until the ammeter reads 15 amps. If hose heat is restored, then the fault is within the gun whip.

If hose heat is not restored, turn the hose heater power control fully counterclockwise, then turn OFF the hose heat circuit breaker and the main power disconnect and proceed with the steps below:

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