Fuel Nozzle and Fuel Nozzle cavity – Check:
a) For Fuel Nozzle and O-ring damage and/or contamination.
b) For correct Fuel Nozzle for the PROHEAT BTU rating.
Test Procedure – Fuel Nozzle removal, inspection and cleaning or replacement:
a) Disconnect all harnesses at the PCM.
b) Disconnect the fuel supply line.
c) Loosen and back out the burner head mounting (2) bolts five to six turns
allowing enough room to rotate the burner head 15° counter-clockwise
and remove.
d) Remove Fuel Nozzle. Verify the Fuel Nozzle number ensuring it is the
correct Fuel Nozzle for your PROHEAT model. See table below.
e) Disassemble, inspect, clean, and reassemble Fuel Nozzle.
Fuel Nozzle disassembly, inspection, cleaning and reassembly:
• Hold the Fuel Nozzle stem lightly but firmly in a vise, take care not to
cause damage. Disassembles in three pieces.
• Inspect Fuel Nozzle stem and O-ring for contamination and/or damage.
Inspect and clean distributor fuel orifice, air passages, head and stem
with electrical contact cleaner, brake cleaner or warm soapy water.
PROHEAT M-SERIES SERVICE MANUAL
3-6
START: Fuel System Step 3
(1 Flash)
Figure 3-3: Burner Head Removal and Fuel Nozzle Removal
FUEL NOZZLE CAVITY
FUEL NOZZLE
TORQUE = 100 in-lbs
NOTICE
Fuel Nozzle parts are a matched set
and not interchangeable.
MODEL NUMBER
M50 30609-50
M80 30609-9
M105 30609-11
MOUNTING BOLTS (2)
TORQUE = 100 in-lbs
COOLANT PUMP
SWITCH INPUT
TEMP SENSOR 1
POWER
FUEL INLET
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