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Thanks for the replies. While I can think of one instance where it was clearly a material or manufacturing defect, the maintenance program we have is certainly lacking and will make it easier to deny a warranty claim. Probably a better use of resources to improve maintenance than buy a warranty...

Plant where I work is reviewing the requirements for new projects. We've been having problems with HVAC equipment failure soon after the standard 1 year warranty expires. Would adding a 5 year part and labor warranty requirement to the specifications for new projects be reasonable? I understand...

I don't think having both a swamp cooler and a refrigerated air system on a house is commom. There would be too many people who would run them both on a hot day, not understanding how they work. With the huge latent load, they would literally be pouring money down the drain in the form of...

friartuck, the problem I'm having now is that the AHU discharge damper is what isolates the AHU from the test chamber. Hot air is then used to de-ice the AHU coils, but my problem is that the dampers ice up and are inoperable prior to starting the de-icing. I can't be dumping hot air into the...

A low temperature test facility I'm working on has a cold air system which delivers air into the test chamber at -50 degrees F. There are two air handlers so that one can be working while the other is being de-iced. Motorized dampers are used in the duct to isolate the air handlers, however, the...

Thanks, I was unaware about the calibration issue. Is the calibration something that can be done locally (or in the field) or does the tool have to be shipped to a calibration facility?

Thanks. I think I'm going to approve them, provided that they can show that they will have enough fittings on hand to complete the job.

Does anyone have any experience with the Rigid ProPress crimp pipe fittings? http://www.propresssystem.com/ A contractor is submitting it as an alternative to soldered copper for a chilled water hydronic system. I'm leaning towards approving it, but thought I'd ask if anyone has worked with...

I want to thank everyone for their answers. That photo was just one that I found on the internet. The chimneys that originally sparked my interest are along a route I bike ride along every weekend. If I remember to take a digital camera one day, I'll try to take a photo and post it though now I...

Just thinking about a subject that I've been wondering about for some time. At times when I'm driving past a refinery or a heating plant, I've noticed that some of the smoke stacks have a helical fluting or strakes along the exterior of the stack, usually near the top. Does anyone know the...

Is this a primary/secondary pumping arrangement?

I'm more concerned about a compressor failing than losing the charge. The switching of the circuit sounds like a possibility, but then I'd have to worry about the refrigerant charge being adequate, right? I want to make sure any piping changes don't change my suction and discharge conditions on...

I was looking at the original 40 tear old HVAC system in building yesterday. The tenant was inquiring about modernizing the system for better performance. What I found was two multizone AHUs which will probably require a bit of maintenance that was neglected over the years, maybe a new control...