Instruction manual

Table Of Contents
Instruction Manual
HAS64E-IM-HW
September 2008
NGA 2000 HFID
4 - 23Maintenance and ServiceEmerson Process Management GmbH & Co.OHG
a. LON/Power Module
1. Disconnect wiring connectors, note locations.
2. Refer to Figure 4-20. From the outside 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 location.
2. Refer to Figure 4-20. From the inside of the front
panel, remove the two hex nuts securing LED in-
dicator assembly to front panel. Remove indica-
tor assembly and o-rings (four).
3. Inspect o-rings for damage, replace if necessary.
Install o-rings on replacement indicator assem-
bly, mount assembly on mounting studs with hex
nuts.
4. Re-connect wiring connector.
c. Manual Ignite Toggle Switch
1. Disconnect wiring connector, note location.
2. Refer to Figure 4-20. From the outside of the front
panel, remove the toggle switch seal.
3. Pull the switch and o-ring out from inside the front
panel.
4. Inspect o-ring for damage, replace if necessary.
Install o-ring on replacement switch, insert through
front panel from the inside.
5. Install switch seal.
6. Re-connect wiring connector.
d. Burner Air Sensor
1. Disconnect wiring connector, note location.
2. Using an open-end wrench to hold the sensor fit-
ting while using another open-end wrench to re-
move the sensor.
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 location.
2. Using an open-end wrench to hold the sensor fit-
ting while using another open-end wrench to re-
move the sensor.
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 Regulator
1. Disconnect the two tubes and the sensor fitting
on the rear of the regulator, 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 regulator threaded shaft.
6. Insert regulator into front panel, secure with mount-
ing nut.
7. Re-attach the three tubes.
g. 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 regulator.
5. Replace the Teflon pipe thread tape on the two
plugs, the elbow and the male adapter and install
into replacement regulator.
6. Connect tube to elbow, insert male adapter into
tee fitting.
7. Install mounting bracket onto regulator, hand snug
mounting nut.
8. Attach mounting bracket to front panel, tighten
regulator mounting nut.