Service manual

— Page 70 —

600-D01 Series Hydronic Heating System Service Manual - Rev. A

SECTION 9: DIESEL-BURNER COMPONENTS

Diesel-Burner Motor (continued) -

RPM Test:

Disconnect the ignition cables from the ignition

electrodes.

Remove the four ignition coil screws that secure the

ignition coil to the protection cap.

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.

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.

Disconnect the motor’s black (+) and brown (-)

wires from the C-plug harnesses black (+) and

brown (-) wires.

Connect the motor’s wires directly to a 12 volt DC

power supply.

Turn the power supply

and use a photo-

tachometer to test for a proper RPM reading.

At approximately 12 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.

NOTE:

Test the diesel-burner’s bearings prior to reattach-

ing 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.

NOTE: It may be necessary to remove the diesel-burner to

remove the bottom two screws securing the protection cap in

place. Follow the direction on detaching and reattaching the

diesel burner in section 8

Figure 47