Owner`s manual

Hydro-Hot Hydronic Heating System Shop Manual 07/03
R
NOTE: Inspect the clear bowl of the Fuel Filter
for water. If water exists, be sure to purge the
Hydro-Hot's entire fuel system prior to replacing
the Fuel Filter. Attempt heater restart.
a. Clamp off and remove the Hydro-Hot's Fuel
Return Line, reference Figure 1. Now attach
a short piece of fuel line to the Hydro-Hot's
Fuel
Return Port and place the other end in a
con
tainer of diesel fuel. Remove the clamp
and
ensure that the fuel line is completely
submersed in the fuel and 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 connections at the Hydro-
Hot
, Diesel-Burner, and at the
vehicle's fuel tank for looseness.
Tighten if necessary. Also, check
that
all Fuel Filter Head fittings
are
securely tightened, see the
"NOTE"
below.
NOTE: 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.
Section 7: Troubleshooting
Section 7.5,
continue
d
Section 7.5,
continue
d
Page 28
2
1
4
3
output to
Hydro-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 Hydro-Hot’s
"Return" Port
SUPP
LY PORT:
to Hydro-Hot’s
Fuel Filter
dedicated
fuel pick-up
Fuel Pick-up Pipe Illustration