HINTS FOR HOMEBUILDERS
fuse the connector as close to its supply bus as
possible. A 12-volt power cord is routed to the
connector of your choice (cigarette lighter,
etc.). I installed a miniature power jack in the
rear of my cabin and wired the jack directly to
the aircraft bus with an inline fuse installed
right at the battery/master relay. Bundle the
wires to exit the slot in the top ABS board
cover. I recommend securing the top board
cover in two to four spots with some hot glue.
(This permits easy removal if necessary.) Do
this after you power up for testing.
Inside the cooler are the pump and hoses that cycle the chilled water.
For the initial power-up test I recommend
using a 12-volt bench power supply that
is current-limited to about 1 amp.
This will help preclude damage
in case something got assembled
wrong. Upon power-up you should
feel a small vibration in the pump
that will let you know it is running.
Check the fan airflow through
the radiator. Add enough water
to submerge the pump to check
the system flow and for leaks.
Please note there is a flow rate lever
adjustment on the side of the pump.
This should be kept in the wide-
APPLICATION AND USE
Load the cooler with ice cubes and add
about 1 inch of chilled water to submerge
the pump. Mount the AC unit in your plane,
connect to aircraft 12-volt power, and turn
it on. The pump will circulate cold water
through the radiator and return it back over
the ice. The fan provides that welcome
stream of cold air. Operating time is, of
course, temperature-dependent, but you
can expect up to an hour or more of cool air
before melting all of the ice. I have found
that filling the cooler case with ice cubes
has been sufficient for my type of flying.
It has been most comforting in getting me
from the hangar, down the taxiway, and
through a climb to cooler altitudes. I usually
have sufficient remaining ice for the descent
back into hotter air. On longer trips in more
hot and humid environments, you may
want to add a drain tube and bring along
an ice refill.
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