Graco A-25 Heated Hose, Overtemperature Switch, Check Hose Connectors, Check FTS Cables

Page 31

Repair

Overtemperature Switch

Read Warnings on page 4. Wait for heater to cool before repairing.

1. Turn main power OFF

. Disconnect power

supply.

2.Relieve pressure, page 13.

3.Wait for heaters to cool.

4.Remove heater shroud.

5.Disconnect one leadwire from overtemperature switch (359), FIG. 8. Test across switch with ohmme- ter. Resistance must be approximately 0 ohms.

6.If switch fails test, remove wires and screws. Dis- card failed switch. Apply thermal compound 110009, install new switch in same location on housing (351), and secure with screws (311). Reconnect wires.

NOTE: If wires need replacement, disconnect tempera- ture control module. See Table 2, page 26 and FIG. 6, page 26

Heated Hose

Refer to the heated hose manual for hose replacement parts.

Check Hose Connectors

1. Turn main power OFF

. Disconnect power

supply.

2. Relieve pressure, page 13.

NOTE: Whip hose must be connected.

3.Disconnect hose connector (D) at Reactor, FIG. 9.

4.Using an ohmmeter, check between the two termi- nals of the connector (D). There should be continu- ity.

5.If hose fails test, retest at each length of hose, including whip hose, until failure is isolated.

Check FTS Cables

1. Turn main power OFF

. Disconnect power

supply.

2.Relieve pressure, page 13.

3.Disconnect FTS cable (F) at Reactor, FIG. 9.

F

D

ti17788a

FIG. 9. Heated Hose

4.Test with ohmmeter between pins of cable connec- tor.

Pins	Result


1 to 2	approximately 35 ohms per 50 ft (15.2 m) of
	hose, plus approximately 10 ohms for FTS

1 to 3	infinity

5. If cable fails test, retest at FTS, page 32.

3A1570A

31

Image 31

Contents Repair-Parts Important Safety InstructionsContents Manual Description Proportioner ModelsSystems Related ManualsElectric Shock Hazard Fire and Explosion Hazard Equipment Misuse Hazard Important Two-Component Material Information Changing Materials Temperature Control Diagnostic Codes DataTrak Diagnostic CodesSymbol Code Code Name Diagnosis Cause Checks E01 High fluid temperatureCauses of E01 Errors Sensor Connector Continuity Checks Pins Description ReadingE03 No zone current E02 High zone currentE06 Communication cable unplugged E05 Control board over temperatureE99 Loss of communication Before Beginning Repair Pressure Relief ProcedureShutdownOpen Close ParkFlushingPumps and Pressures TroubleshootingProblems PowerProblem Cause Solution Electronics Problem Cause SolutionProblem Cause Solution Heater See E04 Fluid Temperature SenSor FTS or thermocouple discon Hose Heat System Problem Cause Solution Repair Follow Pressure Relief Procedure,Disconnect Pump Connect Pump Remove Air Motor Install Air MotorAir Filter Element Removal Air Filter Element InstallationRecirculation / Over Pressure Relief Block Air Inlet Filter / Water Separator Auto DrainBottom of Power Modules Temperature Control ModuleTemperature Control Module Connections Connector DescriptionTest SCR Circuit Replacing Temperature Control Assembly Modules Heater Element Primary Heater Line Voltage KW Dual Zone Heater Thermocouple ThermocoupleHeated Hose Overtemperature SwitchCheck Hose Connectors Pins ResultInstallation Fluid Temperature Sensor FTSTest/Removal Transformer Secondary Check Replace Transformer Transformer Primary CheckModel Secondary Voltage Size Component Replace Circuit Breaker ModulePump Lubrication System Pump Lubrication SystemRefer to Reactor A-25 Wiring Schematic, Temperature DisplayFluid Inlet Strainer Screen Display Module Detail of Membrane Switches and Temperature Display BoardReplace Battery Replace DataTrak Battery or FuseReplace Fuse Recommended Spare Parts Accessories7984 100 888 PartsTorque pump locking nuts to 66-74 ft-lbs 90-100 Nm Cart Part Description QtyNipple Screw Control PanelWheel Kit Temperature ControlRef. Part Description Qty Fluid Inlet Kit Fluid ManifoldRing Kw Dual Zone Heater, 24J788PLUG, Pipe Air Motor Pump AssemblyLength Connection Outside Ft m From Air Tubing ConnectionsColor Diameter Breaker Module Phase Reactor A-25 Wiring SchematicPOD Reactor A-25 Wiring Schematic Simplified Schematic, Heater Controls Category Data Technical DataGraco Information Graco Standard Warranty

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