How the Pro Panel Controls Package Units

To get the most out of multi-stage split systems, the Pro Panel splits Y1 and Y2 contacts, as well as W1 and W2 contacts. But what about package units? Here's how the Pro Panel controls package units, including how to wire a package unit to the Pro Panel.

Transcript:

So the Pro Panel is able to stage the condenser and the blower independently. That means that if the panel decides it needs high stage airflow, like you’ve got enough ductwork open to run in high stage, but the condenser doesn’t need to turn on Y2, then it’ll actually run Y2 to the indoor unit and only Y1 to the outdoor unit, running the blower in high stage and the condenser in low stage.

This is mostly for saving energy, preventing the condenser from running at that higher capacity if it doesn’t need to. And you’re going to see a little bit more about how the panel knows whether it needs to turn Y2 condenser on or not.

Of course, in some applications you’re not going to have separate Y1 Y2 contacts. So we’ve actually got a setting built into the Pro Panel to say if you’ve got something like a package unit. You can tell the system you’ve only got a single set of Y1 Y2 contacts. All of that control that applies to a separate indoor and outdoor unit don’t apply to you. And it’ll combine all the settings to just a single set of Y1 Y2 contacts, and you just wire up to a single set of Y1 Y2 contacts.

Things like zone weights and the timers and the temperature thresholds that help deal with staging, those are all going to get combined into controlling Y1 Y2, as opposed to the split Y1 Y2 indoor and outdoor.

You can also use this for systems where you just don’t have a set of Y1 Y2 contacts on your outdoor unit. That would be something like: you’ve got communicating equipment; or the indoor unit and the outdoor unit are communicating together, and you’re just wiring the Pro Panel to the indoor unit only. You’d use this setting for that application as well.

Here’s a wiring diagram showing that example. You can see that Y1 Y2 are wired into the package unit. And they’re going to the condenser terminal on the HVAC output. The Y1 Y2 under blower are left empty because you’ve only got a single set of Y1 Y2 contacts on your equipment.