Emerson Process Management 760004-A - Manual (Page 44)

Instruction Manual
760004-A
February 2002
4-6 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management
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.