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Thanks everyone. We will keep the in row unit connected to the building chill water system. We'll just open the isolation valves if needed. I do have a vendor that can put together a standard residential condensing unit with low ambient control(s). I am already seriously considering a walk in...

We presently have an APC In Row chilled water unit that is supplied from our main building chiller system. Works great until the power goes down. The building chiller is not on our generator circuit. I am going to keep the APC unit and supply chill water from a different source that is supplied...

I am trying to put together a small chiller system for an existing in-row cooling unit in a server room. We are keeping the in-row cooler. Is it acceptable to purchase a 3 ton residential type condensing unit and then match it with an indoor refrigerant to water brazed plate heat exchanger with...

Thanks everyone. My confusion comes from thinking about the moisture content in the air. At the conditions I state above, I can reheat the air and lower the R.H. but still have the same moisture content(?) in the air. Is the R.H the "driving force" for the books to absorb moisture or the...

All; We have recently turned a general storage area into a book storage area. There are currently two fan coil units and no reheat. I am trying to keep it dry in there by cooling the space to 60-65 degrees. The relative humidity increases, of course, and that is the parameter that everyone wants...

We are going to replace 2 reciprocating compressors on a chiller unit. These compressors share a common circuit. Outdoor air cooled condensers, chiller barrels inside below condensers. One contractor wants to install suction accumulators and oil separators. Two other contractors would not bid on...

Is it normal to use the area above a suspended ceiling as a return plenum? We have a large building with several rooms and zones with no return ducting at all. It seems to me we are picking up a lot of heat in the summer (losing heat in winter). Just curious.

We have a sixteen year old Carrier Split System with a leaking condenser (original compressors I believe)and a twenty year old Trane RAUB ACCU (one of two that serve the same AHU)that has a bad compressor. First, should I replace the evaporator coils if I replace the condensing units and in the...