Quote:
FF wrote:
Most air cond output readings are at the evap , about 40F is the goal.Below that and icing is a possibility .
Measuring at the end of a duct allows too many variables.
THe key to efficient air cond is in having a very efficient ducted return system.
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*Not really true...34 to 42 degrees is the target with a 15 to 18 degree TD...
<ul>[*]Higher than 18 degree TD usually means restricted air flow and is where you will see coil icing in ambient air temps below 68 degrees or higher depending on how restricted...[*]Less than 15 degree TD usually means a system problem...[/list]These figures are what Cruisair & Marine Air design for...
Yes a long duct run can reduce TD a bit...
I do agree about the duct system needs to be efficient, but many times ducted return is anything but in a boat, and more often too small for the Btu design due to space restraints aboard....
Steve~
Marine-AC.com