Graco 309524L Repair, Primary Thermostat & Probe, Backup Thermostat, Reassembly Notes

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Repair

Repair

WARNING

Read warnings, pages 4-5. Make sure the main power is off and heater is cool before repairing.

Hazardous Location Heaters: See FIG. 15 & 17

Non-hazardous Location Heaters: See FIG. 16 & 18

Primary Thermostat & Probe

1.Follow Pressure Relief Procedure, page 14.

2.Remove housing cover (18).

3.Hazardous Location Heater only: Loosen nut (27).

Non-hazardous Location Heater only: Loosen screws (25).

4.Loosen setscrew (26) in switch shaft (28).

5.Remove screw (16) and bracket (19) holding probe (EE).

6.Remove wires from the primary thermostat termi- nals (FF).

7.Pull thermostat probe (EE) out of heater block (3). Remove thermostat (24) from housing (1).

8.Hazardous Location Heater only: Remove screws (25).

Non-hazardous Location Heater only: Remove screw standoff (35) with washer (27).

9.Remove bracket from thermostat (24) and secure to new thermostat.

CAUTION

To avoid damaging capillary tube (GG), which can cause heater malfunction, do not kink or nick the tube.

To avoid shorting out the heater, do not allow capillary tube to contact the block terminal (3A). Follow step 10, below.

10.Liberally apply thermal lubricant (part no. 110009) to probe (EE) of new thermostat (24). Loop capillary tube (GG) several times and wrap the loops with tie strap (42-not shown). Insert probe in the heater block (3).

11.Continue reassembling in reverse order of disas- sembly. See Reassembly Notes, below.

Backup Thermostat

1.Follow Pressure Relief Procedure, page 14.

2.Remove housing cover (18).

3.Remove screws (HH) on backup thermostat (10) tabs, and remove the wires one from heater block (3A) and one from line in (9B).

4.Remove the two screws (16), then remove the ther- mostat (10).

5.Liberally apply thermal lubricant (part no. 110009) to the bottom of the thermostat (10) and reinstall it in reverse order of disassembly.

Reassembly Notes

Refer to FIG. 15 or 16 for wiring connections.

Non-hazardous Location Heater only: Make sure gasket (47) is installed and aligned with electrical housing screw holes.

Secure cover (18) with lockwashers (5) and screws (6 or 52); torque screws to 89 in-lb (10 N•m).

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309524L

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Contents Viscon HP Hazardous Location Heater shownNon-hazardous Location Heaters ModelsHazardous Location Heaters ApprovalsContents TranslationsManual Conventions Skin Injection Hazard Equipment Misuse Hazard Installation Typical Installation DrawingKey Chart Notes Selecting TubingMounting Heater Wall MountingBracket Fluid Connections Accessories Cart MountingRequirements For All Installations Hazardous Location Installation RequirementsElectrical Connections Wall Mounted Wiring Cart Mounted WiringGrounding Determining Proper Fluid Temperature To find your fluid’s Under-Boil temperatureEffect of Temperature on Viscosity Initial Flushing Pressure Relief ProcedureOperation Priming SystemSetting Heater Control Adjusting for SprayingRefer to FIG Flushing MaintenanceFollow Pressure Relief Procedure, Unclogging Fluid PassagesTroubleshooting Problem Cause SolutionRepair Backup ThermostatReassembly Notes Primary Thermostat & ProbeThermostat Repair Hazardous Location Heaters Thermal Limit Sensor Control KnobHeater Block Control Repair Hazardous Location Heaters Parts Hazardous Location HeatersRef. No Heater Block Series Volts / Watts Part No. Description QtyNon-Hazardous Location Heaters Enclosure Accessories Cable Clamp Kit 246303 Installation Cable Clamp Kit KeyTechnical Data Maximum Temperature Rise vs. Flow RateDimensions Graco Standard Warranty Graco Information

309524L specifications

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