Air Compressor – Check:
a) Air Compressor pressure and operation.
Before checking air pressure, remove, disassemble and clean Fuel
Nozzle. Go to Fuel Nozzle disassembly, inspection, cleaning and
reassembly, page 3-6.
Test Procedure – Air Compressor pressure:
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 ignition electrode assembly. Use a flat head screwdriver to pry
the electrode assembly out.
e) Remove the flame shield. Rotate to match the mounting square.
f) Disconnect the Fuel Shut-off Valve and Ignition Module connectors at the
PCM. This ensures that fuel will not spray and/or light during testing.
g) Remove the Air Compressor test port plug and install pressure test gauge.
h) Reconnect the power and switch harnesses at the PCM.
i) Switch the PROHEAT on and read the air pressure:
If the Air Compressor reading is out of range, go to Air Compressor filter
check before attempting adjustment.
If the Air Compressor filter is clean, adjust the PSI ouput as per table
below. If the Air Compressor cannot be set to the correct PSI output,
replace Air Compressor. Go to Air Compressor removal and reinstallation,
page 3-13.
If a Start diagnostic code is indicated, proceed to Step 7.
PROHEAT M-SERIES SERVICE MANUAL
3-12
MODEL AIR PRESSURE BAR (PSI)
M50 0.42 ± 0.01 bar (6.2 ± 0.2 PSI)
M80 0.22 ± 0.01 bar (3.2 ± 0.2 PSI)
M105 0.26 ± 0.01 bar (3.8 ± 0.2 PSI)
ADJUSTMENT SCREW
Figure 3-13: Air Compressor Adjustment
START: Fuel System Step 6
(1 Flash)
GAUGE (P/N PK0067)
TEST PORT LOCATION
NOTICE
Leaving the Temperature Sensor(s)
disconnected ensures that the
burner head will only run in purge for
a maximum of three minutes. It will
not try to fire up.
FLAME SHIELD
IGNITION
ELECTRODE
ASSEMBLY
WARNING
To avoid the risk of shock and to
ensure that the PROHEAT does not
fire, disconnect the Ignition Module
connector at the PCM.
Figure 3-12: Air Pressure Test
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