Principles Of Operation; Component Description - Proheat M80 Service Manual

2.0 PRINCIPLE OF
OPERATION
2.1 COMPONENT DESCRIPTIONS
Combustion Air Blower:
Impeller-style blower driven by the Motor provides the principle combustion air.
Motor:
Drives the Combustion Air Blower, Air Compressor and Fuel Supply Pump.
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
7 – 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.
Fuel Regulator:
Diaphragm-type pressure reducing valve. The Fuel Regulator drops the fuel
supply pressure to atmospheric pressure (0 PSI).
Fuel Nozzle:
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.
Fuel Shut-off Valve:
Electrically operated solenoid valve which controls fuel flow to the Fuel Nozzle.
Air Compressor:
Rotary vane compressor that supplies air pressure (in the range of 3 – 5 PSI)
to the Fuel Nozzle.
Ignition Module:
Electronic Ignition Module with plug-in electrode.
PCM:
Electronic control module monitors the PROHEAT sensors, operating conditions,
(PROHEAT Control Module)
and controls the Motor and other devices. Diagnostics are utilized for both
safety in operations and detection of component faults to aid in service and
troubleshooting. The PCM contains the flame sensor which senses the flame
intensity. This information can be retrieved by a personal computer using
PROHEAT Datalink software.
Combustion Tube:
Directs the air supplied by the blower through a swirler into the combustion
zone, mixing it with the atomized fuel/air mixture from the Fuel Nozzle.
PROHEAT M-SERIES SERVICE MANUAL 2-1