Model NGA2000 HFID

Instruction Manual

748297-E June 2003

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.

5.Inspect o-ring for damage, replace if necessary. Install o-ring onto regula- tor threaded shaft.

6.Insert regulator into front panel, se- cure with mounting nut.

7.Re-attach the three tubes.

Purge Air Regulator

1.Remove the regulator mounting nut, remove mounting bracket.

2.Loosen nut on tee fitting attached to purge air flow switch.

3.Disconnect tube at elbow, remove regulator.

4.Remove the two plugs, elbow and male adapter fittings from the regula- tor.

5.Replace the Teflon pipe thread tape on the two plugs, the elbow and the male adapter and install into replace- ment regulator.

6.Connect tube to elbow, insert male adapter into tee fitting.

7.Install mounting bracket onto regula- tor, hand snug mounting nut.

8.Attach mounting bracket to front panel, tighten regulator mounting nut.

Purge Air Flow Switch and Diffuser

1.Unscrew flow switch from tee fitting.

2.Replace Teflon pipe thread tape on tee fitting.

3.Remove diffuser from flow switch and install into replacement flow switch.

4.Install replacement flow switch.

5.Install purge switch onto tee fitting.

6.Re-connect tubes.

Burner Air Solenoid Valve

1.Disconnect the tube at the top elbow fitting.

2.Disconnect the tube at the tee fitting, remove valve analyzer module.

3.Holding the air ignite restrictor, un- screw the solenoid valve.

4.On the solenoid valve, remove the connector fitting.

5.Replace the Teflon pipe thread tape on the elbow, connector and restric- tor.

6.Verify replacement solenoid valve wires (flat side of body) are exiting on the same side as the COM port as shown in Figure 4-20 on page 4-22. If not, use an open-end wrench to hold the N.O. hex port while rotating body.

7.Install air ignite restrictor into N.C. port.

8.Install elbow into COM port and con- nector fitting into N.O. port.

9.Re-connect tubes.

Rosemount Analytical Inc. A Division of Emerson Process Management

Maintenance and Troubleshooting 4-25