Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 8: DIESEL-BURNER SERVICE, MAINTENANCE, AND REPAIR INFORMATION
Motor,
continued
Adjustment Procedure:
N/A
RPM Test:
Disconnect the
Ignition Cables
from the
Ignition Electrodes
; reference Figure
16. Remove the four
Ignition Coil Screws
, which secure the
Ignition Coil
to the
Protection
Housing
; reference Figure 13. Lift the
Ignition Coil
and disconnect its
wires
from the
C-Plug Harness
wires
prior to removing. Remove the
Protection Housing
from the
Diesel-Burner,
allowing the
Motor and Clutch Halves
to be exposed; reference Figures 12
and 13. Place a few wraps of black electrical tape around the
Clutch Halves
, 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 approxi-
mately 12.5 Volts-DC, the RPM reading should be 4500 RPMs (+/- 300 RPMs). If the
Motor’s RPM reading is not within the above specs, the
Motor
must be replaced; refer-
ence the Motor’s Replacement Procedure” in this section. Reference Section 10 for
spare part number information.
NOTE:
Prior to reattaching the
Diesel-Burner Head
or replacing the
Motor
(if
applicable), be sure to test the Diesel-Burner’s
Bearings
. Worn
Bear-
ings
can cause lower than normal RPM readings and premature
Motor
wear. To properly test for worn
Bearings
, reference Section 8.9 for the
Bearings “Function Test.”
M
P
R
0
0
5
4
Black Electrical
Tape on Clutch Halves
Black
Wire (+)
Brown
Wire (-)
Motor
Reflective
Tape
Photo
Tachometer
Figure
12
Page 45
