Does anyone know how the refrigerant in the unit works? Does each air handler have its own dedicated amount of refrigerant that is locked into its own line set, or does the refrigerant get all mixed together into the outdoor unit?
The reason I ask is I've noticed as soon as I turn on a second air handler on the same outdoor unit, the other air handler starts blowing hotter air than it was and overheats the room.
I have two different outdoor units and it happens on both.
I did a test this morning, I put two air handlers on 46 degree heat mode (which is just meant to prevent pipes freezing) let it run like that for 30 mins, the house was already warm so both air handlers were just blowing cool air, no heat whatsoever (which is what I would expect since the house is already 65-68 degrees). Then I put one air handler on 68 degrees, and left the other one on the 46 degree heat mode. Within a min, the air handler still on 46 degree mode starts blowing warm air, when the room was already 65 degrees, temp in the room went up a degree after 10 mins. So that leads me to believe the refrigerant is shared.
I've also seen this happen when I have two on just regular temperatures (example one is at 67, maintaining room temperature there) then I turn on a second at 69, and the room that was previously maintaining at 67 starts getting much much hotter.
So either the refrigerant is shared, or somehow the outdoor unit is heating up all the refrigerant more when more than one unit is on.
The reason I ask is I've noticed as soon as I turn on a second air handler on the same outdoor unit, the other air handler starts blowing hotter air than it was and overheats the room.
I have two different outdoor units and it happens on both.
I did a test this morning, I put two air handlers on 46 degree heat mode (which is just meant to prevent pipes freezing) let it run like that for 30 mins, the house was already warm so both air handlers were just blowing cool air, no heat whatsoever (which is what I would expect since the house is already 65-68 degrees). Then I put one air handler on 68 degrees, and left the other one on the 46 degree heat mode. Within a min, the air handler still on 46 degree mode starts blowing warm air, when the room was already 65 degrees, temp in the room went up a degree after 10 mins. So that leads me to believe the refrigerant is shared.
I've also seen this happen when I have two on just regular temperatures (example one is at 67, maintaining room temperature there) then I turn on a second at 69, and the room that was previously maintaining at 67 starts getting much much hotter.
So either the refrigerant is shared, or somehow the outdoor unit is heating up all the refrigerant more when more than one unit is on.
source https://hvac-talk.com/vbb/showthread.php?2225606-Multiple-Air-Handlers-Single-outdoor-unit-One-effects-the-other&goto=newpost
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