Proheat M125 - Manual (Page 46)

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 4-7.
Air Compressor filter check:
a) Remove blower housing (2) screws and blower housing.
b) Remove the Air Compressor filter. Inspect for contamination and replace if
necessary. Ensure filter is installed on the same side as the compressor
and seated properly into the PCM.
START: Fuel System Step 4
(1 Flash)
NOTICE
Leaving the Temperature Sensor(s)
disconnected ensures that the burner
head will only run in Cool Down (Purge)
mode for a maximum of three minutes.
WARNING
To avoid the risk of shock and to
ensure that the PROHEAT does not
fire, disconnect the Ignition Module
and Fuel Solenoid connector at the
G-II PCM.
Test Procedure – Air Compressor pressure (all models):
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 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 Solenoid Valve and Ignition Module connectors at the
G-II PCM. This ensures that fuel will not spray and/or light during testing.
g) For Diaphragm Compressor pressure check and setting, please continue
below. For Rotary Vane Compressor pressure check and setting, please
go to page 4-11.
MOUNTING BOLTS (2)
TORQUE = SEE SECTION 1.3
COOLANT PUMP
SWITCH INPUT
DUAL MODE TEMP
SENSOR
POWER
FUEL INLET
AIR FILTER
HOUSING SCREWS
TORQUE = SEE SECTION 1.3
Figure 4-8: Burner Head and Blower Housing Removal.
4-9 PROHEAT M-SERIES G-II PCM SERVICE MANUAL