I do believe that is the 2nd stage lock in jumper selection. If set at 45, when the outdoor temperature is below 45 it locks the heat pump into 2nd stage and therefore sends 24 volts out of the Y2 OUT terminal so your blower runs at full speed even if the thermostat is only calling for 1st stage.
What about the carrier condensers (Model# CA17NA03600GABAA) that don't have the control board at the condenser but the factory listed it as a 2 stage unit? How would I connect my Y/Y2 or should I simply connect to Y1 to the air handler and leave it as that?
So if im understanding this right, the way they want you to hook it up will not let it run in 2nd stage heating? Does that affect cooling as well? Reason is i think my xp16 isn't wired correctly. I have no wire at the y2 on my thermostat
Interesting. I suspect they did this to keep the head pressure from getting too high in heating mode when it's mild outside. Keep in mind that most of the heat given up by the refrigerant is done via condensing into a liquid - so the temperature of the refrigerant won't drop below saturation until it is in liquid state, capacity should be minimally affected. it's saturation temp and refrigerant flow rate that matter. Any temp drop in the vapor side of the long lineset in heating mode will be attributed to dropping to saturation. (de-superheating) - again, minimal capacity loss.
I just ran across your YT. Appreciate everything you do, Allen. Wonderful hands-on classes for the college kids we brought by!
👍 where are yall located?
@@HVACTailGateTrainer Southern Tech Sanford. I’ve moved on to start my own gig in AL.
Dr f
N nnh hyn ern nnh union Dr y r try reed km ite
Eknn everything on no
Never ran into one of those units but I’m glade I randomly saw this.
I do believe that is the 2nd stage lock in jumper selection. If set at 45, when the outdoor temperature is below 45 it locks the heat pump into 2nd stage and therefore sends 24 volts out of the Y2 OUT terminal so your blower runs at full speed even if the thermostat is only calling for 1st stage.
What about the carrier condensers (Model# CA17NA03600GABAA) that don't have the control board at the condenser but the factory listed it as a 2 stage unit? How would I connect my Y/Y2 or should I simply connect to Y1 to the air handler and leave it as that?
So if im understanding this right, the way they want you to hook it up will not let it run in 2nd stage heating? Does that affect cooling as well? Reason is i think my xp16 isn't wired correctly. I have no wire at the y2 on my thermostat
It only effects heating under the temp selected to limit you to y1, if colder out than that if you get a call for y2 it will allow y2 heating.
Interesting.
I suspect they did this to keep the head pressure from getting too high in heating mode when it's mild outside.
Keep in mind that most of the heat given up by the refrigerant is done via condensing into a liquid - so the temperature of the refrigerant won't drop below saturation until it is in liquid state, capacity should be minimally affected. it's saturation temp and refrigerant flow rate that matter. Any temp drop in the vapor side of the long lineset in heating mode will be attributed to dropping to saturation. (de-superheating) - again, minimal capacity loss.
Thanks alot
Genius
You made that really confusing