How to pick a setpoint profile program on a Honeywell UDC3500 controller

Honeywell UDC3500 universal digital controllerYou’ve heard this phrase before: “It’s simple. But nobody said it would be easy.”

And this is exactly one of those cases.

The Honeywell UDC3500 digital controller can support up to four setpoint programs, the ramp/soak profiles used in batch control operations. But after configuring all four profiles, I was stuck on how to select the one I wanted the controller to use.

There’s no “Program Select” button on the keypad. So I was mystified on how I was going to select my setpoint profile program #3.

I’ve been working with Honeywell controllers for 25 years now, and I have a pretty solid feel for how the manuals are laid out (and yes, I’ve read them): Specs, mounting, wiring, configuration, more configuration, even more configuration, and then a chapter on operations.

So I flipped to the Operations section in the UDC3500 manual, found the part on Setpoint Programming, and spent 10 minutes reading. But I still couldn’t find anything about selecting a program. There’s stuff on using the run/hold button and viewing the current segment number, but nothing on selecting the program.

I emailed Honeywell TAC (technical assistance center), and Dave pointed me in the right direction.

Check out the ProgramX way down at the bottom of the list.

Honeywell UDC lower display key parameters

Honeywell UDC controller lower display keySo, as it turns out, the lower display key is the magic button. It scrolls through a list of items in the lower display, eventually showing PROGRAMX, which, when you change with the up and down arrow keys, lets you scroll through and select one of your stored setpoint programs. (PROGRAM1, PROGRAM2, etc.)

See? It’s simple. Just not obvious.

Visit for the latest Honeywell UDC3500 controller operations manual.


Lesman Instrument Company is the authorized Honeywell stocking distributor in North and Central Illinois, Northern Indiana, Eastern Iowa, Wisconsin, and Michigan’s Upper Peninsula. If you are located outside that area, you can find your local sales office or get technical assistance by visiting Honeywell’s contact page.

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