8.5.5 Nozzle Line Assembly Cleaning
How often?
Once per year or if the nozzle becomes blocked with debris (if blocked, a higher operating fuel
pressure will be seen on the pump pressure gauge).
Tools Required:
7/16 in., 1/2 in., 3/4 in. and 17mm (boxed end/12-pt.) wrenches, 5/8 in. socket/ratchet, 5/8 in.
wrench, 1/4 in. nut driver, hex wrench, vise, flat-blade screwdriver, small wire brush or pipe
cleaner (from optional maintenance accessory brush kit), parts washer fluid, shop air gun,
safety glasses, rubber gloves.
Replacement Parts:
Nozzle O-ring (PN 20213152) or Nozzle (PN 20210123 for EL-140H/EL-200H, PN 20210124
for EL-350H)
Personally verify that the main power is turned off and locked out at the circuit
breaker.
Procedure - All Models (Refer to figures):
1. Wear all safety equipment.
2. Remove the preheater and burner from the furnace (refer to previous sections).
3. Using a 7/16” wrench, disconnect the fuel and air tubing from the Nozzle Block.
4. Using a 17mm boxed-end/12-pt.wrench, remove the knurled nuts from the Nozzle Block
(refer to figure).
5. Using a flat-blade screwdriver, loosen the Ignition Transformer screws. Rotate tabs out
of the way and lift the Ignition Transformer back on its hinge.
Disconnecting Nozzle Block
Flare and knurled
nuts. Loosen fuel
and air tubing
connections from
nozzle assembly.
Ignition
Transformer
Loosen tabs and
swing up the
transformer cover.
Disconnect 2-pin
connector
(underneath cover).
54
Call 1-615-471-5290 for Technical Support
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