George,
I will check the fan air flow direction tomorrow because I am uncertain.
If you have the label out and the wires on the correct holes, yours is
likely OK.
There are 2 philosophies about the fan direction. One is that you
should exhaust the heat and let the assembly draw cool air across the
hot components.
The other says to let the fan "blow" on the hot components.
The major difference between the two is that a blower fan adds heat to
the air (due to the work produced by the fan), but adds the benefit of
directing the air flow to the area to be cooled.
An exhaust fan does not add its work product heat to the air being
moved, but the cool air cannot be directed as well because it is spread
over a large area in the enclosure box.
73,
Don W3FPR
On 5/21/2017 11:26 AM, George Winship, NC5G wrote:
Interesting. I built my K2/100 about 17 years ago and the fan has always
drawn air into the cabinet and exhausted over the heatsink. So, I rechecked
the manual and disassembled my rig to check for proper assembly. Fan label
is facing out and wires are soldered to the right pads(red=+, black=-). Was
there maybe a change in later models?
73, George
Make certain the fan is mounted with the label out and that the red wire
is in the +hole and the black one in the -hole.
The fan should exhaust the hot air. Cooler air flows in at the front of
the heatsink.
--
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