Emerson Process Management 760004-A NOTE, Do not, 4-3BURNER, c.Igniter, over-tighten, b.RTD Detector, d.Flameout Sensor, a.Temperature Sensor, Do not over- tighten

Instruction Manual

760004-A February 2002

Model NGA 2000 HFID

4-3 BURNER

This section covers burner components which can be replaced without removal of oven from the chassis.

a.Temperature Sensor

1.Refer to Figure 4-4A. Remove the four screws on the oven cover, re- move cover.

2.Refer to Figure 4-5. Remove the burner cap retainer.

3.Disconnect the temperature sensor wiring connector, note location.

4.Remove the temperature sensor.

5.Insert replacement sensor.

NOTE

The leads of the temperature sensor must be leading away and down from the sensor to enable proper fit of burner cap retainer.

6.Install the burner cap retainer. U-slot must be located above temperature sensor.

7.Re-attach wiring connector.

8.Install oven cover.

b.RTD Detector

1.Refer to Figure 4-4A. Remove the four screws on the oven cover, re- move cover.

2.Refer to Figure 4-5. Loosen the set screw securing RTD detector.

3.Disconnect RTD detector wiring con- nector, note location.

4.Gently grasp RTD detector wires and pull out of hole.

5.Insert replacement RTD detector into hole, snug down set screw.

6.Re-attach wiring connector.

7.Install oven cover.

c.Igniter

1.Refer to Figure 4-4A. Remove the four screws on the oven cover, re- move cover.

2.Refer to Figure 4-5. Disconnect the igniter wiring connector, note location.

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

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

5.Re-attach wiring connector.

6.Install oven cover

d.Flameout Sensor

1.Refer to Figure 4-4A. Remove the four screws on the oven cover, re- move cover.

2.Refer to Figure 4-5. Disconnect the flameout detector wiring connector, 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.

4-6 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management