Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 8: DIESEL-BURNER SERVICE, MAINTENANCE, AND REPAIR INFORMATION
Diesel-Burner
Controller,
continued
NOTE:
If, after performing the following circuit tests, the
Controller
is deter-
mined to be defective and must be replaced, reference the Controller’s
“Replacement Procedure” in this section. Reference Section 10
for spare parts information.
Ground Circuit Test
Locate the Controller’s
B-Plug
and
C-Plug
; reference Figure 8. Insert the probes of a DC
voltmeter into the
B-4 (+)
and
C-5 (-)
locations and turn the
“Diesel”
switch
ON
; reference
Figures 4 and 8. If a voltage reading does not register on the voltmeter, the
Controller
must be replaced. If voltage is present, proceed to the next circuit test.
NOTE:
The temperature of the Aqua-Hot’s Boiler Tank must be below 160°F
prior to performing the following tests.
VAC/VDC Control Thermostat Circuit Test
Locate the Controller’s
B-Plug
and
C-Plug
; reference Figure 8. Insert the probes of a DC
voltmeter into the
C-1 (+)
and
B-2 (-)
locations and turn the
“Diesel”
switch
ON
; reference
Figures 4 and 8. If a voltage reading does not register on the voltmeter, the
Controller
must be replaced. If voltage is present, proceed to the next circuit test.
VDC High-Limit Thermostat Circuit Test
Locate the Controller’s
B-Plug
and
C-Plug
; reference Figure 8. Insert the probes of a DC
voltmeter into the
C-4 (+)
and
B-2 (-)
locations and turn the
“Diesel”
switch
ON
; reference
Figures 4 and 8. If a voltage reading does not register on the voltmeter, the
Controller
must be replaced. If voltage is present, proceed to the next circuit test.
Motor Circuit Test
Locate the Controller’s
C-Plug
; reference Figure 8. Insert the probes of a DC voltmeter
into the
C-2 (+)
and
C-5 (-)
locations and turn the
“Diesel”
switch
ON
; reference Figures 4
and 8. If no voltage reading registers on the voltmeter, the
Controller
must be replaced.
If voltage is present, proceed to the next circuit test.
Ignition Coil Circuit Test
Locate the Controller’s
C-Plug
; reference Figure 8. Insert the probes of a DC voltmeter
into the
C-8 (+)
and
C-5 (-)
locations and turn the
“Diesel”
switch
ON
; reference Figures 4
and 8. If no voltage reading registers on the voltmeter 18-25 seconds after the
Diesel-Burner’s initial start-up, the
Controller
must be replaced. If voltage is present,
proceed to the next circuit test.
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