Proheat M125 - Manual (Page 26)

PRINCIPLE OF
OPERATION
COMPONENT DESCRIPTIONS
Impeller-style blower driven by the Motor provides the principle combustion air.
Drives the Combustion Air Blower, Air Compressor and Fuel Supply Pump.
A positive displacement, gear-type pump that draws fuel from the vehicle fuel
tank and supplies it to the Fuel Regulator. Pressure is regulated between
5 – 10 PSI by means of an internal relief valve. Fuel is re-circulated within the
pump, therefore a fuel return line to the tank is not required.
Diaphragm-type pressure reducing valve. The Fuel Regulator drops the fuel
supply pressure to atmospheric pressure (0 PSI).
Air-aspirating type burner nozzle. Compressed air flows through the air
passages, exiting the nozzle in front of the fuel orifice creating a vacuum in
the fuel supply. This draws fuel from the Fuel Regulator and the combined
fuel/air mixture is atomized into the combustion chamber.
Electrically operated solenoid valve which controls fuel flow to the Fuel Nozzle.
Diaphragm compressor that supplies air pressure to the Fuel Nozzle.
Note that older versions of M-Series use a rotary vane compressor. Refer to
page D-1 for more information.
Electronic Ignition Module with plug-in electrode.
Electronic control module that monitors inputs from the sensors and controls
outputs to PROHEAT components. It has an integrated Flame Sensor that photo-
electrically measures the intensity of the flame to determine if a flame is present.
Also built-in to the G-II PCM is a Status Indicator Light that shows operation,
function/component problems and CANbus connectivity to assist with trouble-
shooting. Operation and fault history can be downloaded and viewed on a
computer using PROHEAT Data Link software.
Note that the older G-I PCM version does not have a built-in Status Indicator Light.
Refer to page C-1 for more information.
Directs the air supplied by the combustion air blower through a swirler into the
combustion zone, mixing it with the atomized fuel/air mixture from the Fuel Nozzle.
2.0
2.1
Combustion Air Blower:
Motor:
Fuel Supply Pump:
Ignition Module:
G-II PCM:
(PROHEAT Control Module)
Fuel Regulator:
Air Compressor:
Fuel Solenoid Valve:
Fuel Nozzle:
Combustion Tube:
2-1 PROHEAT M-SERIES G-II PCM SERVICE MANUAL