Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 7: TROUBLESHOOTING
Section 7.5
Section 7.5,
continued
After turning the
“Diesel”
switch
ON
:
TS5: The Aqua-Hot’s exhaust system produces
white smoke after ignition.
Q1 : Is the Diesel-Burner’s
Fuel Nozzle
function-
ing properly?
I.
In order to determine if the
Fuel Nozzle
is
functioning properly, reference Section 8.6
and perform the Fuel Nozzle’s “Component
Test.”
A:
If the
Fuel Nozzle
is not functioning
properly:
The
Fuel Nozzle
must be
replaced; reference Section 8.6
for replacement instructions.
If the
Fuel Nozzle
is functioning properly:
Continue troubleshooting.
Q2 : Is the Diesel-Burner’s
Fuel Pump
producing
the proper pressure?
I.
In order to determine if the
Fuel Pump
is
producing the proper pressure, reference
Section 8.8 and perform the Fuel Pump’s
“Fuel Pressure Adjustment Check.”
A:
If the
Fuel Pump
is not producing the
correct pressure:
Adjust the fuel pressure to 145
psi.
If the
Fuel Pump
is producing the correct
pressure:
Continue troubleshooting.
NOTE (7.5-A):
Be sure to check that the Ignition
Electrode’s
Retaining Clamp Bolt
has not been
overtightened; reference Figure 16. Overtightening
can result in a bound-up (i.e., rigid)
Photo Disc
.
Not allowing the
Photo Disc
to float freely (i.e., a
loose fit) will cause poor combustion and result in
smoky exhaust. If a tight
Photo Disc
exists, refer-
ence Section 8.5 and perform the “Ignition
Electrode Adjustment Procedure.”
Q3 : Is the Diesel-Burner’s Fuel Supply System
functioning properly?
Quick Check:
With the
Diesel-Burner
ignited, look for constant white smoke from
the Aqua-Hot’s exhaust system.
(continued on next page)
Ignition
Electrodes
Photo Disc
Flame Sensor
Fuel Pump
Fuel Solenoid
Fuel
Nozzle
Diesel-Burner
Controller
Ignition Coil
Diesel-Burner
Head
Diesel-Burner
Controller
Illustration 7.5-1
Page 28
