4installation & operation manual | ocle/ocla heating system
2.1 OIL PLUMBING
INSTALLATION
NOTICE
Heating system damage: Engine vibration will
damage the heating system; isolate the heating system
from vibration. Never mount the heating system or
components directly to the engine. If the heating
system is installed using rigid pipe, use a section of
exible hose to the supply and return ports to isolate
the heating system from engine vibration.
2.1.1 OIL SUPPLY
Installing a short, straight oil supply line with a minimum
of ow restriction is the most important step toward
ensuring heating system longevity. When installing
the OCLE/OCLA oil supply line, refer to the following
HOTSTART guidelines:
• Due to the increased viscosity of lubrication
oil, the oil supply line must be as short and
as straight as possible. Any 90° elbows will
reduce the maximum recommended oil
supply length. See Table 1 for HOTSTART
OCLE/OCLA oil supply recommendations:
PUMP
INLET
HOSE INNER
DIAMETER
MAX. LINE
LENGTH
MAX. ELBOW
COUNT
1/2 inch
NPT
1 inch 20 feet
(6 meters)
4
1 inch
NPT
1-1/2 inch 20 feet
(6 meters)
4
1-1/2 inch
NPT
2 inch 20 feet
(6 meters)
4
NOTE: Each additional pair of 90° elbows will reduce
the maximum recommended line length
by ve feet (1.5 meters). To minimize ow
restriction, HOTSTART recommends using
sweeping bends or 45° ttings.
• At a minimum, size the oil supply line per the
pump inlet. NOTICE! Do not reduce the
supply line inner diameter; pump seal
damage will occur.
NOTE: To maximize ow and allow the longest
possible supply line, install the largest
practical inner diameter hose; for most
installations, HOTSTART recommends using
a hose with a size larger inner diameter than
the pump inlet.
• Install the oil suction port as low as possible
in the oil sump. NOTICE! Avoid installing
the oil suction port in a location that may
allow debris or sediment to enter the
heating system.
• HOTSTART recommends installing a
customer-supplied, swing-type or full-ow
check (non-return) valve to prevent oil owing
into the sump. Install the check valve as close
to the oil supply port as possible.
• To ensure consistent oil heating, it is
acceptable to select a suction port on the
opposite side of the sump.
2.1.2 OIL RETURN
When installing the OCLE/OCLA oil return line, refer to
the following HOTSTART guidelines:
• At a minimum, size the oil return line per the
pump outlet. NOTICE! Do not reduce the
return line inner diameter.
• The oil return line must be routed to the
oil discharge port located at the end of the
oil sump opposite the suction port. See
SECTION 2.2.
Table 1. HOTSTART recommended hose inner diameters, line
lengths and elbow counts for OCLE/OCLA oil supply lines.
