Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 7: TROUBLESHOOTING
Section 7.4,
continued
Section 7.4,
continued
A:
If air bubbles are not visible:
Reference “NOTE (7.4-D).”
If air bubbles are visible:
You will need to inspect the fuel
system (supply side) for air leaks.
Therefore, be sure to perform the
inspections listed below until the
air leak has been detected:
1. Inspect the fuel system (supply
side) from the vehicle’s fuel
tank to the
Diesel-Burner
.
Inspect the fuel system for
loose fuel connections at the
Aqua-Hot
and
Diesel-Burner
,
as well as the vehicle’s fuel
tank. Tighten, if necessary.
Also, check that all Fuel Filter
Head fittings are securely
tightened; reference “NOTE
(7.4-C).”
NOTE (7.4-C):
Be sure to check that each fitting at
the
Fuel Filter Head
contains thread sealant. A
fitting without thread sealant could result in an air
leak. Be sure to clamp off both fuel lines at the filter
head prior to any fitting removal. If fittings are
removed and reinstalled, be sure to remove both
clamps prior to attempting a heater restart. Failure
to do so could result in serious damage to the
Diesel-Burner’s
Fuel Pump
.
2. Once the potential air leak has
been discovered and
corrected, reattach the
Aqua-Hot’s
Fuel Return Line
and attempt heater restart.
Does the Aqua-Hot’s exhaust
system still sputter?
If the exhaust system is still sputtering:
Continue performing air leak
inspections until all air leaks have
been discovered and corrected.
NOTE (7.4-D):
If the Aqua-Hot’s exhaust system
still sputters after performing all of the listed checks,
contact the Technical Support Department at
1-800-
685-4298
for additional assistance.
2
1
4
3
output to
Aqua-Hot’s Fuel
"Supply" Port
input
from Fuel Tank /
fuel pick-up
Fuel Filter
TOP VIEW:
of Fuel Filter Head
Plug
Plug
RETURN PORT:
from Aqua-Hot’s
"Return" Port
SUPPLY PORT:
to Aqua-Hot’s
Fuel Filter
dedicated
fuel pick-up
Fuel Pick-up Pipe Illustration
Clear Bowl
Illustration 7.4-2
Page 27
