Owner`s manual

Hydro-Hot Hydronic Heating System Shop Manual 07/03

Black Electrical

Tape on Clutch Halves

Black

Wire (+)

Brown

Wire (-)

Motor

Reflective

Tape

Photo

Tachometer

Page 44

Section 8: Diesel-Burner Service, Maintenance, and Repair Information

Motor,

continue

Figure 12

Adjustment Procedure: N/A

RPM Test: Disconnect the Ignition Cables from the Ignition Electrodes,

reference Figure 16. Remove the four Ignition Coil Screws that secure the

Ignition Coil to the Protection Cap, reference Figure 13. Lift the Ignition Coil

and disconnect its wires from the C-Plug Harness wires prior to removing.

Remove the Protection Cap from the Diesel-Burner so that the Motor and

Clutch Halves are exposed, reference Figures 12 and 13. 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, as illustrated in Figure 12.

Disconnect the Motor's Black (+) and Brown (-) wires from the C-Plug

Harnesses Black (+) and Brown (-) wires, reference Figures 12 and 13.

Connect the Motor's wires directly to a 12 volt DC power supply, reference

Figure

12. Turn the power supply ON and use a photo-tachometer to test

for a proper RPM reading, reference Figure 12. At approximately 12.5 volts

DC, the RPM reading should be 4500 RPM's (+/- 300 RPM's). If the

Motor's

RPM reading is not within the above specs, the Motor must be

replaced, reference the Motor's "Replacement Procedure" on Page 45.

Reference Section 10 for spare part number information.

NOTE: If the Motor's RPM reading is out of specs, or even if within

specs, be sure to test the Diesel-Burner's Bearings prior to reattaching

the Diesel-Burner Head or replacing the Motor, if applicable. Worn

Bearings can cause lower than normal RPM readings and premature

Motor wear. To properly test for worn Bearings, reference Section 8.9,

Page 60 for the Bearings "Function Test".