Proheat X45–School Bus - Manual (Page 68)

SECTION 5. TROUBLESHOOTING & REPAIR 5-11
Air Pressure Checks
If Air Pressure is outside the range for the measured voltage please perform
the following checks before adjusting the compressor:
Low Pressure Reading – Check:
i) Inspect air line from compressor outlet to fan end inlet for leaks, kinks or
other restrictions.
ii) Check condition of air compressor filter. Retest with the filter removed.
High Pressure Reading – Check:
i) Nozzle and cavity for blockage. Refer to Step 5 on page 5-12.
ii) Compressor is out of adjustment.
Compressor Adjustment
After performing the above checks and the Air Pressure is still outside the
range for the measured voltage Adjust the air pressure by turning the screw
as shown in Figure 5-10. Altitude Correction is needed above 3000 Feet (see
inset on charts).
DO NOT adjust air pressure when above 6000 Feet.
COMPRESSOR
END VIEW OF
ADJUSTMENT SCREW:
DECREASE
PRESSURE
INCREASE
PRESSURE
ADJUSTMENT
SCREW
ELECTRICAL
MOTOR
FUEL PUMP
Figure 5-10 Compressor / Fuel Pump Assembly
If the air compressor pressure cannot be adjusted back into normal range,
replace air compressor.