Fluid Circulation Pump
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 54
Burner Components
RPM Test:
1. Disconnect the ignition cables from the ignition electrodes.
2. Remove the four ignition coil screws that secure the ignition
coil to the protection cap.
3. Lift the ignition coil and disconnect its wires from the C-plug
harness prior to removing completely.
4. Remove the protection cap from the diesel burner so that
the motor and clutch halves are exposed.
5. Place a few wraps of black electrical tape around the clutch
halves, and then place a small piece of reflective tape over
the black tape.
6. Disconnect the motor’s black (+) and brown (-) wires from
the C-plug harness’ black (+) and brown (-) wires.
7. Connect the motor’s wires directly to a 12V DC power
supply.
8. Turn the power supply ON and use a photo-tachometer to
test for a proper RPM reading.
9. At approximately 12V DC, the RPM reading should be 4500
RPM’s (±300 RPM). If the motor’s RPM reading is not within
these specifications, the motor must be replaced.
NOTE:
It may be necessary to remove the diesel burner to
remove the bottom two screws securing the protection cap
in place. Follow the directions on detaching and reattaching
the diesel burner starting on Page 47.
NOTE:
Test the diesel burner’s bearings prior to reattaching
the diesel burner head or replacing the motor. Worn bearings
can cause lower than normal RPM readings and premature
motor wear. To properly test for worn bearings, reference the
bearings function test section.
Diesel Burner Ignition Coil
Ignition Coil Cables
Figure 88
Figure 89
Figure 90
