Carrier 39M Damper Actuators

[subu]

Hi All,

I am designing a project and I am at the stage for sizing damper actuators. I have these 2 Carrier 39M Packaged RTUs which have integrated OA, RA and Spill Dampers. However, as a controls contractor, I am required to provide the actuator, by our scope. The Mechanical Drawings do not show the damper sizes nor do the cut sheets on the unit. Could any body suggest as to how I could get a damper actuator sized. I tried reaching Carrier but as we all know (probably), Carrier doesnt have a good customer service/support.

SOS!!!

[djken]

What size 39M?

[subu]

Its a size 30 unit. I assume that means it's a 30 ton unit.

[gyhooyabat]

Subu,
39MW's are built per an order, there is no common size. Meaning that the 39MW30 on your job may have been ordered to produce 15,000 CFM or it may have been ordered to produce only 13,500 CFM. Again, depending on the order. We have several types of fans that we use depending on what the design is calling for. I.e. how much air and at what pressure.

Check your fan/air handler schedule to see what those units were built for. Once you know what kind of air you have to move and at what pressure, then you should know how to size your actuators.

If those units were ordered with our Product Integrated Controls (PIC's), then you may only need to interface with the controller on the unit and it will drive the dampers or valves actuators. Again, check your schedule to see what this unit was suppose to produce and at what pressure.

Our customer service is not intended for engineering design. Like any other, that would cost you for our time. If you have a problem with the equipment after it has been officially started up, then you can contact customer service and we will attempt to assist you in repairing the problem.

Good luck in your design. Hopefully this helps you.

[subu]

Thank you John.

I eventually got the damper actuators sized by using a scale master on the drawing to find the approximate size of the damper. There were 2 39MW units - one 13000 CFM and 0ne 23000 CFM. The first one served an auditorium and the second one served VAV boxes for the classrooms. However, I assume I over designed the actuators, which I believe is not a bad thing to do under uncertainity as this one. Please let me know if I was wrong so that I can make corrections before I send the submittals out.

Subu Balan
http://www.btg-usa.net