Graco A-25 important safety instructions Thermocouple

Page 30

Repair

Thermocouple

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 thermocouple wires from B on tempera- ture control module. See Table 2, page 26 and FIG. 6, page 26.

6.Feed thermocouple wires out of cabinet. Note path as wires must be replaced in the same way.

7.See FIG. 8. Loosen ferrule nut (N). Remove thermo- couple (361) from heater housing (351), then remove thermocouple housing (H). Do not remove the thermocouple adapter (356) unless necessary. If adapter must be removed, ensure that mixer (360) is out of the way when replacing the adapter.

S361

N

H

1	356

T

360

FIG. 8. Thermocouple

8.Replace thermocouple, FIG. 8.

a.Remove protective tape from thermocouple tip

(T).

b.Apply PTFE tape and thread sealant to male threads and tighten thermocouple housing (H) into adapter (356).

c.Push in thermocouple (361) so tip (T) contacts heater element (358).

d.Holding thermocouple (T) against heater ele- ment, tighten ferrule nut (N) 1/4 turn past tight.

9.Route wires (S) into cabinet and thread into bundle as before. Reconnect wires to board.

10.Replace heater shroud.

11.Turn on heaters A and B simultaneously to test. Temperatures should rise at same rate. If one heater is low, loosen ferrule nut (N) and tighten ther- mocouple housing (H) to ensure thermocouple tip

(T) contacts element (358).

1	Apply PTFE tape and thread sealant.
2	Apply 110009 thermal heatsink compound.
301	358	2	359

ti7924a

30

3A1570A

Image 30

Contents Important Safety Instructions Repair-PartsContents Related Manuals Proportioner ModelsSystems Manual DescriptionElectric Shock Hazard Fire and Explosion Hazard Equipment Misuse Hazard Important Two-Component Material Information Changing Materials DataTrak Diagnostic Codes Temperature Control Diagnostic CodesSymbol Code Code Name Diagnosis Cause Sensor Connector Continuity Checks Pins Description Reading E01 High fluid temperatureCauses of E01 Errors ChecksE02 High zone current E03 No zone currentE05 Control board over temperature E06 Communication cable unpluggedE99 Loss of communication Pressure Relief ProcedureShutdown Before Beginning RepairParkFlushing Open ClosePower TroubleshootingProblems Pumps and PressuresProblem Cause Solution Problem Cause Solution ElectronicsProblem Cause Solution See E04 Fluid Temperature Sen HeaterSor FTS or thermocouple discon Hose Heat System Problem Cause Solution Follow Pressure Relief Procedure, RepairDisconnect Pump Connect Pump Install Air Motor Remove Air MotorAir Inlet Filter / Water Separator Auto Drain Air Filter Element InstallationRecirculation / Over Pressure Relief Block Air Filter Element RemovalConnector Description Temperature Control ModuleTemperature Control Module Connections Bottom of Power Modules Replacing Temperature Control Assembly Modules Test SCR CircuitPrimary Heater Heater ElementLine Voltage KW Dual Zone Heater Thermocouple ThermocouplePins Result Overtemperature SwitchCheck Hose Connectors Heated HoseFluid Temperature Sensor FTS InstallationTest/Removal Transformer Primary Check Transformer Secondary Check Replace TransformerModel Secondary Voltage Replace Circuit Breaker Module Size ComponentPump Lubrication System Pump Lubrication SystemTemperature Display Refer to Reactor A-25 Wiring Schematic,Fluid Inlet Strainer Screen Detail of Membrane Switches and Temperature Display Board Display ModuleReplace DataTrak Battery or Fuse Replace BatteryReplace Fuse Accessories Recommended Spare PartsParts 7984 100 888Torque pump locking nuts to 66-74 ft-lbs 90-100 Nm Part Description Qty CartNipple Control Panel ScrewTemperature Control Wheel KitRef. Part Description Qty Fluid Manifold Fluid Inlet KitKw Dual Zone Heater, 24J788 RingAir Motor Pump Assembly PLUG, PipeAir Tubing Connections Length Connection Outside Ft m FromColor Diameter Breaker Module Reactor A-25 Wiring Schematic PhasePOD Reactor A-25 Wiring Schematic Simplified Schematic, Heater Controls Technical Data Category DataGraco Standard Warranty Graco Information

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