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Just a quick question - when using high temperature hot water what type of valves do you typically use? Butterfly or Ball? Sorry if this is a silly question.

Has anyone utilized the VAV diffusers? I am wondering with the thermal element inside the diffuser determining how much air to space to contro temp- what tells the unit to be in heating or cooling? outdoor air temp only? What allows the unit to maintain constant volume?

Could anyone give my information as to the pipe testing procedure for pressure piping in ansi b31 - test pressure, length of time etc.? thanks

How do I find the full load kilowatts of a condensing unit - 1 compressor rla=63.6, lra= 266, 2 fans 1@fla 4.3, 1@fla 3.7?

I need assistance designing a small structure to support a 2000 lb transformer. It is to be mounted on an angle fram supported from a plate bolted through a 12'' masonry wall. Not sure but I think a 3x3x1/2 angle fram with 1/4'' thick plate with 4 1/2'' bolts will do the trick. any feelings?

I am currently looking for some good a/c load calculation, duct pressure drop and water piping pressure drop programs. Any suggestions would be appreciated. Thanks