Kettle Gas Safety Valve, Kettle Temperature Control, and Kettle Thermopile Diagnosis. Graco 3A1320K, ThermoLazer 200/200TC/300TC and Thermolazer ProMelt Pavement Marking Systems, Repair, 3A1320H, ThermoLazer 200/200TC/300TC and Thermolazer ProMelt Pavement Marking Systems, Repair, ThermoLazer 300TC, ThermoLazer 200TC, 3A1320J, ThermoLazer 200/200TC/300TC and Thermolazer ProMelt Pavement Marking Systems, Repair, 3A1320L, ThermoLazer 200/200TC/300TC and Thermolazer ProMelt Pavement Marking Systems, Repair

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Kettle Gas Safety Valve, Kettle Temperature Control, and Kettle Thermopile Diagnosis. Graco 3A1320K, ThermoLazer 200/200TC/300TC and Thermolazer ProMelt Pavement Marking Systems, Repair, 3A1320H, ThermoLazer 200/200TC/300TC and Thermolazer ProMelt Pavement Marking Systems, Repair, ThermoLazer 300TC, ThermoLazer 200TC, 3A1320J, ThermoLazer 200/200TC/300TC and Thermolazer ProMelt Pavement Marking Systems, Repair, 3A1320L, ThermoLazer 200/200TC/300TC and Thermolazer ProMelt Pavement Marking Systems, Repair | Manualzz

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Kettle Gas Safety Valve, Kettle Temperature Control, and Kettle Thermopile Diagnosis

Kettle Gas Safety Valve,

Kettle Temperature Control, and

Kettle Thermopile Diagnosis

The gas safety valve, temperature control and thermopile can be checked by using a millivolt meter. Before checking, make certain all electrical connections are clean and tight.

Terminal Connections

3 2

Connect millivolt meter to appropriate terminals (see

Terminal Connections

Step

1

2

).

ti14524c

1

Part(s) to Be

Checked

Gas safety valve

Terminal

Connections

2 and 3

Temperature control

1 and 2

Status of

Temperature

Control

Contacts

Closed

Closed

Desired

Meter

Reading Diagnosis

Greater than

100 mV

Less than

80 mV

If mV reading > 100 mV and the automatic valve (main burners) does not come on, replace the gas safety valve.

If mV reading < 100mV, proceed with diagnostic steps 2 and 3.

If reading > 80 mV:

• Clean and tighten electrical connections at temperature control and gas safety valve.

• Check valve to make sure wires are in good condition. Replace as required.

• Rapidly change temperature setting on temperature control to see if cycling cleans the contacts.

3 Gas safety valve magnet and thermopile

1 and 2 Open Greater than

325 mV

If the preceding fails to give mV reading < 80 mV, replace temperature control.

If mV reading < 325 mV:

• Clean and tighten all electrical connections.

• Adjust pilot burner to increase millivolt output (see page 18).

If the preceding fails to give mV reading > 325 mV, replace thermopile.

Check valve magnet after obtaining correct mV output for thermopile:

• Ignite pilot burner only and allow the mV reading to stabilize.

• Shut pilot burner (turn gas safety valve knob OFF).

Note the mV reading where magnet drops out.

If magnet unlocks at mV reading < 120 mV, the magnet is

OK. NOTE: When magnet unlocks a click can be heard and mV reading may fluctuate slightly.

3A1320K

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