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A kinked fuel line (return side) will increase the fuel pressure to
hazardous levels and may cause a fuel line to rupture. A kinked
fuel line could also severely damage the diesel-burner's internal
fuel system.
Fuel Filter Location:
Mount the fuel filter assembly in a location that pro-
vides easy access for replacing the filter element and for
catching any potential fuel spillage when servicing.
Fuel System Requirements:
•
The diesel fuel supply should be drawn directly from
the vehicle's main fuel tank or from a separate auxiliary
fuel tank, if applicable.
•
The fuel tank should be equipped with a dedicated fuel
pick-up pipe (outlet port and inlet port). Reference
Figure 34.
NOTE: If an auxiliary fuel tank is required, be sure to consult
the ANSI/NFPA 1192 handbook concerning heating
systems' diesel fuel system specifications.
Also, be sure to reference the ANSI/NFPA 1192 hand-
book for information regarding fuel distribution system
specifications.
•
Use 3/8 inch I.D. (Internal Diameter) fuel lines.
•
The combined length of the supply and return fuel
lines should not exceed 100 feet in total length. Refer-
ence Figures 35 and 36.
•
All fuel-fitting hardware (i.e., at the vehicle's fuel tank,
fuel filter, and Aqua-Hot fuel parts) must be 1/4 inch
NPT or greater with a 3/8 inch barbed fitting. Fuel
fittings less than 1/4 inch NPT may restrict fuel flow,
thereby compromising the diesel-burner's performance.
NOTE: The fuel pick-up pipe
should not extend further than the
motorhome's engine fuel supply
pick-up and should be consistent
with the on-board generator's fuel
© 2008 Aqua-Hot
®
375-D Hydronic Heating System Installation Manual Rev. A
Fuel System Installation:
1.
Run two 3/8 inch fuel lines from the fuel tank inlet and
outlet ports to the Aqua-Hot.
Both fuel lines should be laid as flat as possible and any
extreme rises in height should be avoided in order to
eliminate any potential air-traps.
Run both fuel lines in areas where they cannot be
pinched, kinked, or damaged during normal operating
conditions.
Run the fuel tank outlet fuel line past the fuel filter
location in preparation for step 7.
2.
Be sure to secure all fuel lines where necessary and
apply protective shielding in areas where chafing may
occur.
3.
Label both fuel lines indicating whether they are an
outgoing line or an incoming line.
4.
Connect the Aqua-Hot's fuel lines to the vehicle's fuel
tank. Reference Figure 34.
5.
Install and tighten the appropriate fuel fittings onto the
Aqua-Hot's fuel ports, as well as the two ports of the
fuel filter. Reference Figures 37 and 38.
6.
Connect the inlet and outlet fuel lines to the Aqua-
Hot's fuel port connections. Reference Figure 38.
7.
Cut the fuel line at the fuel filter mounting location and
connect the fuel lines as illustrated in Figures 35 and 36.
NOTE: Be sure that the flow of fuel through the filter is in the
correction direction as illustrated in Figure 37.
OUTLET PORT:
to the
Aqua-Hot's Fuel Filter.
Dedicated
Fuel Pick-Up
Pipe
supply pick-up length.
section 7: Fuel system
INLET PORT:
from the
Aqua-Hot's Outlet port.
Figure 34
— Page 23 —
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