Emerson Process Management 760004-A e.Fuel Sensor, a. LON/Power Module, d. Burner Air Sensor, b.LED Indicator Assembly, c.Manual Ignite Toggle Switch, f.Burner Air and Fuel Regulators

Model NGA 2000 HFID

Instruction Manual

760004-A February 2002

a. LON/Power Module d. Burner Air Sensor

1.Disconnect wiring connectors, note locations.

2.Refer to Figure 4-20. From the out- side of the front panel, remove the two mounting screws.

3.Install replacement module in reverse order.

b.LED Indicator Assembly

1.Disconnect wiring connector, note lo- cation.

2.Refer to Figure 4-20. From the inside of the front panel, remove the two hex nuts securing LED indicator assembly to front panel. Remove indicator as- sembly and o-rings (four).

3.Inspect o-rings for damage, replace if necessary. Install o-rings on re- placement indicator assembly, mount assembly on mounting studs with hex nuts.

4.Re-connect wiring connector.

c.Manual Ignite Toggle Switch

1.Disconnect wiring connector, note lo- cation.

2.Refer to Figure 4-20. From the out- side of the front panel, remove the toggle switch seal.

3.Pull the switch and o-ring out from in- side the front panel.

4.Inspect o-ring for damage, replace if necessary. Install o-ring on replace- ment switch, insert through front panel from the inside.

5.Install switch seal.

6.Re-connect wiring connector.

1.Disconnect wiring connector, note lo- cation.

2.Using an open-end wrench to hold the sensor fitting while using another open-end wrench to remove the sen- sor.

3.Replace the Teflon pipe thread tape on the treads of the sensor fitting.

4.Install sensor onto sensor fitting.

5.Re-connect wiring connector.

e.Fuel Sensor

1.Disconnect wiring connector, note lo- cation.

2.Using an open-end wrench to hold the sensor fitting while using another open-end wrench to remove the sen- sor.

3.Replace the Teflon pipe thread tape on the treads of the sensor fitting.

4.Install sensor onto sensor fitting.

5.Re-connect wiring connector.

f.Burner Air and Fuel Regulators

1.Disconnect the two tubes and the sensor fitting on the rear of the regu- lator, note locations.

2.Replace the Teflon pipe thread tape on the threads of the sensor fitting.

3.Remove the regulator and o-ring.

4.The replacement regulator comes with two panel mounting nuts, remove both and discard one of them.

Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Service 4-25