Converting to SCR control

[andserco]

Any thoughts on converting VAV boxes with elec heat from single or staged heat to SCR control, controlled by a VMA (0-10V)......

[mechdorn]

Any thoughts on converting VAV boxes with elec heat from single or staged heat to SCR control, controlled by a VMA (0-10V)......

The only way you should attempt this is going back to the manufacturer of the heater. If the sell some kind of upgrade kit or are willing to sell you the parts, it should be OK. Anything other than that, and something burns up, your liable for messing with the heater in an unapproved manor.

[andserco]

I agree with losing the ETL listing..just brainstorming on some stuff.. Thanks

[bmc]

Any thoughts on converting VAV boxes with elec heat from single or staged heat to SCR control, controlled by a VMA (0-10V)......

SCR control works very well on older VAV boxes. In one site I do repairs at have found only draw back is expensive to replace the SCR components when they fail.

[Cagey57]

I agree with mechdorn, OEM or not at all.

Try messing with your staging parameters instead. 1/2 the time may get you a better result on a VMA.