If your HSC-60 AC unit ever makes a high pitched noise or shows an E4 error, make sure to shut the AC off right away to avoid further damage to the unit.
Once your air conditioner is turned off, follow the steps outlined in the video below:
Transcript: I’m going to demonstrate how to properly wire our units—5-ton and 7-ton spot coolers. A common problem we’ve come across in the past is customers running out of phase. They’ll say the compressor is whining, it’s running extremely hard, which is highly possible if your power legs are out of phase.
When you go to remove this panel before wiring, after you remove the panel slightly, do not completely remove it away from the unit. There is another type of safety built into the unit which is the fire alarm. This will read an alarm signal onto your display board and will have a little sound going with it. It’s connected to the panel of the door at all times, even when you go to put the panel back on after you’re done wiring, reattach it to the fire alarm. All it is is a quick connect, and when you’re done wiring you pop it back in and then you can mount the door back onto the unit.
If you look down at the terminals, you’ll see “RST.” Now, it’s not a standardized type of electrical wiring, so picture it as L1 as R, S as L2, and T as L3, and then you got your ground lug sitting over here. So I’m going to first wire my ground wire. Then I’m going to work my way bottom to top so I’m not in my way. I’m going to start with L3, but it’s very specific according to the way your panel’s wired. If you have four wires, red and white could be interchangeable in a box. It’s very particular so you have to make sure you’re in that kind of sequence. In our panel here where we’re testing, white is L3 and red is L2.
This is proper wiring, whether it be yourself doing the wiring or you have an electrician doing it, make sure they know the wiring inside is duplicated on the outside of the unit, so you know you’re properly set up. What you’re going to end up doing is turning on your power, and then you’ll turn on your breaker. You’ll have two breakers here, your main voltage breaker and then you’ll have your low voltage breaker that actually controls all the low voltage circuits and your display board on the unit.
if you notice as the unit’s running, there’s no high squealing, all you hear is the blower motors. If this unit is ever out of phase, on top of the blower motor sound you’ll hear that compressor squealing, a very high pitched sound
So now I’m going to demonstrate what the compressor would sound like in an out of phase condition. Like I said, a protection on the unit would pop up and an E4 message before there is extreme damage caused to the compressor, but nonetheless it can cause damage to compressor without even saying that message.
In this present set up, I actually switched 1 and 3 around, so I moved my normal high leg to L3 and then moved my L3 leg to L1 just to demonstrate the out of phase condition. So I’m going to power the unit back up and you’ll want to listen for the compressor. If you hear that sound, you know there’s something wrong and there could be extreme damage to the unit so I’m going to stop it shortly, because I don’t want to cause damage to the unit.
Again, even in that condition, still protect the compressor, go through a sixty second countdown. You’ll still hear blower motors run–that’s standardized. If it runs too long in that condition and you’re in a loud atmosphere, you may not hear that compressor making that sound. Therefore, it should go off in an E4 message if it hasn’t already made damage to the unit, which is what we don’t want.