Proheat X45–School Bus - Manual (Page 50)

Figure 4-1. Sleeper Fan model shown.
SECTION 4. PRINCIPLE OF OPERATION 4-1
PRINCIPLE
OF OPERATION
A gear pump driven from the same motor as the compressor pulls fuel from
the tank. The fuel is filtered at the fuel pump inlet.
Reduces fuel to atmospheric pressure. Siphoning action from the nozzle
draws fuel from the regulator. Without this siphoning there is no fuel flow.
A diaphragm type compressor supplies air to the fuel nozzle.
An automotive type ignition coil supplies high voltage to the ignition electrode,
sparking to the combustion tube.
Circulates the engine coolant. An impeller style pump is used because of its
low current draw and free flow during engine operation. IT IS NOT SELF-
PRIMING. The pump must be flooded and the system must be purged of all
air for it to operate. (DO NOT run dry.)
Utilizes a microprocessor to monitor operating conditions and control outputs
1. Fuel Pump
2. Fuel Regulator
3. Air Compressor
4. Ignition Coil
5. Coolant Pump
4.0
1
3
5
2
4
6
GENERAL DESCRIPTION 4.1
17