Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 8: DIESEL-BURNER SERVICE, MAINTENANCE, AND REPAIR INFORMATION
Diesel-Burner
Controller
8.11
Diesel-Burner Controller
Function:
The
Controller
operates all the components of the
Diesel-Burner Head
and
safely shuts the heater
OFF
in the event of an overheat, flameout, or low voltage condi-
tion. It also receives
Diesel-Burner
operation status signals from the
Flame Sensor
,
VDC
Control Thermostat
, and
VDC High-Limit Thermostat
.
NOTE:
The functionality of each component can be determined by completing the
manual checks, as listed under the “Component Test” area for each individual
component, or the components can be tested by using a “Controller Tester.”
Reference Section 11 for Special Tools information.
Component Test:
The following conditions must exist prior to performing the Controller
circuit tests in this section. If one of the conditions below does not exist, please contact
the Technical Support Department at
1-800-685-4298
for additional assistance.
Condition #1
A battery voltage level of between 11.5 and 14.0 Volts-DC must be present at the
Diesel-Burner’s Controller
during all testing; reference Figure 25. It may be
necessary to perform a voltage check to ensure that this condition exists. To
perform the voltage check, locate the Controller’s
B-Plug
, and insert the probes
of a DC voltmeter into the
B-4 (+)
and
B-2 (-)
locations; reference Figure 26.
Condition #2
A voltage level of between 11.5 and 14.0 volts must be present at the
Diesel-
Burner Controller’s
ON/OFF
switch circuit during all testing. It may be necessary
to perform a voltage check to ensure that this condition exists. To perform the
voltage check, locate the Controller’s
B-Plug
, and insert the probes of a DC
voltmeter into the
B-1 (+)
and
B-2 (-)
locations; reference Figures 8 and 26.
Turn the
“Diesel”
switch
ON
and observe the voltage level; reference Figure 4.
Figure 25
Diesel-Burner
Head
Diesel-Burner
Controller
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