Proheat M125 - Manual (Page 44)

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. (Refer to Parts Manual.)
Test Procedure – Fuel Nozzle removal, inspection and cleaning or replacement:
a) Disconnect all harnesses at the G-II 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 using soft jaws,
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 (a soft bristled brush may be
used), air passages, head and stem with electrical contact cleaner or
warm soapy water.
START: Fuel System Step 3
(1 Flash)
Figure 4-6: Burner Head Removal and Fuel Nozzle Removal.
Figure 4-5: Nozzle Number Location.
M80 nozzle shown.
FUEL NOZZLE CAVITY
FUEL NOZZLE
TORQUE = SEE
SECTION 1.3
NOTICE
Fuel Nozzle parts are a matched set
and not interchangeable.
MODEL NUMBER
M50 30609-50
M80/M90 30609-9
M105/M125 30609-51
MOUNTING BOLTS (2)
TORQUE = SEE SECTION 1.3
COOLANT PUMP
SWITCH INPUT
DUAL MODE TEMP.
SENSOR
POWER
FUEL INLET
4-7 PROHEAT M-SERIES G-II PCM SERVICE MANUAL