Graco 288400 Troubleshooting, Primary Heating System, Problems, Solutions, Problem Solution

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Troubleshooting

Troubleshooting

Primary Heating System

Before performing any troubleshooting procedures:

1. Relieve pressure, page 5.

2. Turn OFF red main power disconnect.

3. Allow equipment to cool.

Heating Rod

Thermostat Leads

Housing

2/54

 







 

 

 



 



 



²&



Thermal Limit Switch

FIG. 1: Primary Heating System

(For complete Electrical Schematic, see page 27)

Problems

Try the recommended solutions in the order given for each problem to avoid unnecessary repairs. Also, determine that all circuit breakers, switches, and controls are properly set and wiring is correct before assuming there is a problem.

Problem

Solution

 

 

 

 

No heat, amber pilot light does not

1

cycle on.

 

 

 

Partial heat, amber pilot light on

2

continuously

 

 

 

Solutions

1.The Thermostat or Thermal Limit Switch is not functioning properly.

a.Thermostat Check - The amber pilot light will only be on when the temperature of the primary

heater is below the temperature setting of the thermostat. Turn the thermostat up (clockwise) to check the operation of the heater and then reset to the desired setting. If this does not solve the problem, continue to Step b.

b.Thermal Limit Switch. When moving the unit, it is possible that the thermal limit switch may trip in transit. If this happens, reset the limit switch and monitor the operation of the heater to ensure the switch has not tripped as a result of a heater malfunction.

To reset the Thermal Limit Switch:

1b. Turn OFF the main switch and primary heater circuit breaker.

2.Turn OFF and lock out power at the source.

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Contents Predator Proportioner Contents Related ManualsElectric Shock Hazard Fire and Explosion Hazard Pressure Relief Procedure Before Beginning RepairFlushing Solutions TroubleshootingProblems Problem SolutionTroubleshooting Proportionting System Hose Heat System Troubleshooting Pump Removal Perform Pressure Relief Procedure,Repair Proportioning PumpsPump Installation See Air Motor Assembly onAir Motor Fluid Inlet Filter Screen Primary Heater ServiceInstallation RemovalFollow Pressure Relief Procedure, Isocyanate Pump LubricantAccessories Recommended Spare PartsParts Parts Main Assembly Ref. Part Description QtyElectrical Console Parts Electrical Console Part Description QtyAir Motor Assembly Air Motor Assembly PumpPrimary Heater Assembly Primary Heater Assembly StopHose Heat Power Pack Hose Heat Power Pack Power Supply Pneumatic Schematic Pneumatic SchematicElectrical Schematic Electrical SchematicParts Technical Data Graco Standard Warranty Graco Information

288400 specifications

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