Installation and Maintenance Manual form 185
Page 7
10% of the total cooling system coolant. Contact
your engine dealer for the exact size.
2.5.4
When piping, do not use tubing or fittings smaller
than the engine or keel cooler connections. If those
on the engine are larger than those on the keel cooler,
reduce the piping at the keel cooler, not the engine.
Use a minimum of elbows and check all connections
for leaks. All high areas in piping must be vented.
2.5.5
To avoid transmitting engine vibrations to the
GRIDCOOLER unit, use wire reinforced rubber
hoses and clamps at the engine and keel cooler
connections.
2.5.6
When installing a multiple-pass unit in a side mounted
position, the inlet line should be connected to the
lower nozzle to force air up and out of the cooling
system. Special units can be ordered with additional
air bleeding vents in the stud end of the cooler.
2.5.7
To avoid air pockets that would restrict coolant flow
through the system and cause overheating, install
the piping between the engine and the cooler so
that it is self- venting.
NOTE:
Depending on installation, special air bleeding
vents are available as an option.
2.5.8
For piping diagrams for multiple cooler installations,
see Figures 11 through 14.
FIG.11 Coolers connected in parallel
FIG.12 Multiple-pass coolers connected in parallel
FIG.13 Coolers connected in series
FIG.14 Coolers connected in series parallel
2.6
FILLING & TESTING
NOTE:
Do not exceed 35 PSI (2.41 Bar) when pressure
testing a GRIDCOOLER® Keel Cooler.
2.6.1
Always premix ethylene glycol (antifreeze) with
water before adding it to the cooling system. Contact
your engine dealer for the proper antifreeze type and
percentage for your engine. We do not recommend
the use of propylene glycol in your cooling system.
2.6.2
Never mix ethylene and proplyene glycol-based
antifreezes in your cooling system.
2.6.3
When installing a GRIDCOOLER Keel Cooler in a
side mounted position, it is important that the unit
is completely filled with coolant before launching
the vessel. This can be accomplished by using the
following procedure:
2.6.4
At the outlet end of the unit, remove the upper drain
plug and fill the unit with coolant
2.6.5
When coolant runs out of the upper drain, replace
the plug.
2.6.6
The unit is now filled with coolant. If the system is
ever drained, you must repeat this procedure.
