Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 7: TROUBLESHOOTING
Section 7.5,
continued
Section 7.5,
continued
A:
If constant white smoke exists:
Continue troubleshooting.
NOTE (7.5-B):
Inspect the clear bowl of the
Fuel
Filter
for water. If water exists, be sure to purge
the Aqua-Hot’s entire fuel system prior to replacing
the
Fuel Filter
. Attempt heater restart; reference
“Illustration 7.5-2.”
I.
Clamp off and remove the Aqua-Hot’s
Fuel
Return Line
; reference Figure 1. Now attach
a short piece of fuel line to the Aqua-Hot’s
Fuel Return Port
and place the other end in
a container of diesel fuel. Remove the
clamp and ensure that the fuel line is com-
pletely submersed in the fuel, then, turn the
“Diesel”
switch
ON
.
Are air bubbles visible in the container of
fuel when the
Diesel-Burner
is operating?
A:
If air bubbles are not visible:
Proceed to Q6.
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
(7.5-C).”
NOTE (7.5-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
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 7.5-2
Page 29
