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I agree with mintjulep. You should be able to go down much more than 20% with an intertwined coil.

It is no problem making this work, the problem is cost. The amount of controls necessary to make a 2 ton RTU modulate to maintain a fixed supply air temp is literally going to cost as much as the unit itself would. There are a number of third parties that sell economizers that can be added to...

Looking for advice for the best way to heat an auto shop that wants to service natural gas fueled vehicles. Shop is in Dallas, TX so the heating requirements aren't huge.

You need to check with the manufacturer. If it is Trane, they started putting an oil return pump on around the late 90's?

@317069 This is an existing building with built up AHU's in the penthouse. The chillers are also up there and the mechanical room was never isolated. The return air comes up a central chase. Outside air comes in through the exterior walls. They mix right in the penthouse where the chillers...

It's a built up system, so it would take some massive ductwork and I have limited space. I can find a way to do it if we have to, but I need to justify to the customer that it is required. They aren't going to spend that kind of extra money when it's been operating this way for 30 years unless...

MechEngNCPE, I agree, but this is an existing commercial office building with three 450 ton chillers up top. I don't have a lot of options for building a new mechanical room.

I have an existing building that has the chiller plant in the return air path. They are looking at replacing the chillers and I am concerned about whether this is allowed today. Local code references ASHRAE 15 Mechanical Room Safety, but I am reading this two different ways. Section 7.3.2...