Igniter
Mounting/ground strap
FID
Pu
rge
Tu
be
FID purge tube grommet
Utility
gas lines
(Do not disconnect here.
Disconnect at unions on the
ends of supply lines )
Setscrew for FID
bottom body
Setscrew
for FID cover
Heater block mounting screws (4)
FID mounting plate
Heater assembly
Heater purge tube
Heater purge tube sealing grommet (Heyco)
(A5E35380226)
Detector bushing (A5E41666802001)
and o-ring (A6X19905099)
Pipe gasket (A5E41666941001)
Set scre
w for
grou
nd st
rap
Install signal cable so
end is aligned with
igniter cable ends
Insulation
Insulation
Insu
lat
ion
Detector Bushing
FID
body
FID
cover
EC cover plate
(A5E35374578001)
Thermal gasket
(2021263-001)
Purge filter (A5E41381855001)
and washer (A5E41849023)
Ground strap set screw goes here
Hole for purge filter
Figure 4-10
FID Installation Exploded Diagram
1. Remove the four screws that secure the purge tube to the electrodes of the detector.
2. Pull the purge tube about 1 inch away from the detector assembly and carefully remove
the wires from the electrodes.
3. The purge tube with its bushing and gasket, EC cover plate, and igniter assembly will not
be reused. Set these items aside. However, the screws that were used to connect the tube
to the detector will be reused.
4. Remove the setscrew for the FID bottom body to separate the detector heater and mounting
plate.
5. Remove the old heater assembly. (2021266) This will not be reused.
Flame Ionization Detector
4.4 Replacing the FID Igniter
Maxum Edition II Detectors
Service Manual, May 2018, A5E42019847001
43