What can be expected when the chilled water supply is piped into the coil outlet and the return to the coil inlet ? I have a number of these units from 2 to 4-1/2 ton capacities, and over half of them are piped in this fashion. I realize that coils are generally designed for counterflow operation (entering air enters the circuits of leaving water and the air leaving the coil contacts the entering water), but I'm not sure what to expect if it isn't piped properly. All I can tell you is that the areas served by these units are having humidity issues. 8 deg air TD, 10 deg water TD, CWV's are functioning, I'm getting flow through the coil but I can't verify the PD due to lack of test ports. Very little condensate off the coils, yet we're maintaining a 70 deg space temp, but the the rh% is around 70. This has been a problem from the beginning, 6 yrs). New acct for us. Thanks for any input. ---gman
BTW - These are a mix of 4 row and 6 row coils.