Instruction manual

NGA 2000 HFID
Instruction Manual
HAS64E-IM-HW
September 2008
4 - 24 Maintenance and Service Emerson Process Management GmbH & Co.OHG
h. 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.
i. 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, unscrew the sole-
noid valve.
4. On the solenoid valve, remove the connector fit-
ting.
5. Replace the Teflon pipe thread tape on the elbow,
connector and restrictor.
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. If not, use an open-
end wrench to hold the N.O. hex port while rotat-
ing body.
7. Install air ignite restrictor into N.C. port.
8. Install elbow into COM port and connector fitting
into N.O. port.
9. Re-connecto tubes.
j. Air Ignite Restrictor
1. On the burner air solenoid valve:
a. Disconnect the tube at the top elbow
fitting.
b. Disconnect tube at tee fitting.
c. Lift solenoid valve from analyzer module.
d. Disconnect tube going to air ignite
restrictor.
e. Remove restrictor from solenoid valve.
2. Add Teflon pipe thread tape to replacement
restrictor, install into solenoid.
3. Re-connect tubes to restrictor, elbow and tee fit-
ting.