GL16 Preventive Maintenance
4-17
Perform only when the unit is OFF
(with power disconnected) and COOL.
12. Apply an anti-seize compound to the gas
inlet threads and the flame pipe threads.
13. Slide the nozzle assembly into the pilot
body.
14. Screw the assembly into its holding.
15. Reconnect the gas piping to the assem-
bly.
16. Reconnect the combustion air line to the
assembly.
17. Carefully install the spark plug and con-
nect the ignition wire.
18. Position the ignition wire so it is not too
close to the touchless temperature sensor
wire or the UV flame scanner cable.
19. Close and secure the left end frame door.
20. Turn on the external gas supply.
21. Turn the power ON at the main discon-
nect switch.
22. Start the unit to verify proper operation of
the spark plug.
Required Tools
wrench, slotted screwdriver,
cleaning cloth
Check Mechanical/Electrical
Connections
Heating, cooling, and normal vibrations may
cause connections to loosen over time. Perform
this procedure to check and tighten the
mechanical and electrical connections.
1. Turn the power OFF at the main discon-
nect switch.
2. Open both of the end frame doors.
3. Check and tighten all mechanical fasten-
ers.
4. Check all electrical connections in the
main electrical box.
5. Check the electrical components in both
end frames.
6. Make sure the electrical connections for
the touchless temperature sensors are
clean and tight. The connections are
located inside each thermocouple
connector.
7. Make sure the electrical connections for
the UV flame scanners are clean and
tight.
8. Close and secure the end frame doors.
Figure 4-22: Nozzle assembly and pilot body
A
B
Figure 4-21: Various components make up the pilot
assembly.
B
A
C
E
F
D
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General