Instruction Manual

748297-E June 2003

Model NGA2000 HFID

Ignitor

1.Refer to Figure 4-4A on page 4-5. Remove the four screws on the oven cover, remove cover.

2.Refer to Figure 4-5 below. Discon- nect the ignitor wiring connector, note location.

3.Using an open-end wrench, unscrew the ignitor assembly from the burner. Verify that o-ring is also removed.

4.Install replacement ignitor and new o- ring. Using open-end wrench, snug down. Do not over-tighten!

5.Re-attach wiring connector.

6.Install oven cover

Burner Cap

O-Ring 903736

Ignitor Assembly 657205

RTD Detector 657063

Set Screw M3X0.5 x 10mm 903125

Flameout Sensor

1.Refer to Figure 4-4A on page 4-5. Remove the four screws on the oven cover, remove cover.

2.Refer to Figure 4-5 below. Discon- nect the flameout detector wiring con- nector, note location.

3.Lift up the burner cap until flameout sensor is accessible. Using an open- end wrench, unscrew the flameout detector from the burner. Verify that o-ring is also removed.

4.Install replacement flameout detector and new o-ring. Using open-end wrench, snug down. Do not over- tighten!

5.Re-attach wiring connector.

6.Install oven cover.

Retainer, Burner Cap

Temperature Sensor

657468

O-Ring 903737

Flameout Sensor 657199

The components shown can be replaced without removing burner/thermal block from oven. Oven not shown for clarity. Thermal block shown in phantom for clarity.

Figure 4-5. Burner - Sensor, Flameout Detector, RTD Detector and Ignitor

4-6 Maintenance and Troubleshooting

Rosemount Analytical Inc. A Division of Emerson Process Management