I'm replacing a condensor fan, fan motor and capacitor on a five ton
packaged (not split) heat pump. The unit has a 1/2 hp, dual
rotation, single speed, 1075 rpm motor with a 22" dia fan with 35
degree pitch angle. Book says this is a proper fan/motor matchup.
The motor rotation and fan installation is set up to draw air into
the top grill across the motor which hangs from the grill in about an
eight inch deep fan housing, with the fan blade below the motor and
then across the coils from the inside out. Coils are set up on two
adjacent sides of the condensor coil box.
A friend told me he thought you always drew in from the bottom/sides
and out the top. I wouldn't necessarily question what I currently
have except that this fan motor has been replaced once, but by an HVAC
service company. I'm assumming they knew what they were doing and did
the replacement per factory specs with the rotation and flow in the
I have an old installation manual but it does not comment on anything
that was set at the factory only hook up wiring. The wiring diagram
is to faded to read.
Comments from anyone who has experience with HVAC installations
please. Is the flow as currently set correct? Is the flow direction
optional? It seems to me you would design with a slight back pressure
so that you could make sure you were contacting all the coil surfaces
and the way to do that, I would think, is to flow as it is currently
installed as described above.
Thanks for any comments.