[kevinRathgeber]

Hi all,

I recently got Carrier minisplits installed and I love them. They were amazing in the summer and so far they're doing pretty good with the colder temperatures.

My only complaint is that they seem to work too well. As in, I'll set it to 62 and the room will get up into the 70's. My understanding was I set the temperature and the unit pumps out heat until it gets pretty close to that temperature and then it should stop pushing out heat. In 3 of my rooms, it seems to just keep pushing out hot air until it gets so warm that I need to turn it off so I don't start sweating.

Is this something that can be fixed? Am I using it incorrectly?

My setup:
Outdoor unit: Carrier 38MGRQ36D--3
Indoor unit 1: Carrier 40MHHQ123
Indoor unit 2: Carrier 40MHHQ093
Indor unit 3: Carrier 40MBFQ12--3
Indor unit 4: Carrier 40MBFQ12--3

These were the model numbers included on the proposal for the project ,but ;et me know if these seem wrong, I can grab the numbers off the instruction manuals I received (which I did read already btw :angel

 

[pecmsg]

Are you running all 4 indoor units?

 

[isuredo]

On multiple head systems there is bleed over thru the other tho one may be calling

 

[ss120396]

This problem is usually caused by misapplication of the system. It can happen when too many indoor units on the system, serving spaces they are oversized for. To operate properly, these systems must always bleed a slight amount of heat to all units.

Luckily there is a possible band-aid fix:

1. Either install wired remotes and reprogram the system to sense indoor temperature at the wired remote, or enable the "follow me" feature on the wireless remotes if available for your system and keep them pointed at the indoor units. This way you are no longer relying on the unit's built-in sensor.

2. Reprogram the units so that the fan cycles OFF when there is no call for heat.

I am not familiar with Carrier mini splits so not sure if these options are available on your particular system. But this is the path your contractor should be investigating. If successful this should solve your main complaint.

Unfortunately if your indoor units are oversized, your system will still probably consume more energy than it should and may have difficulty dehumidifying in the summer.

 

[FlyersFan]

By design, mini split wall mount units will run the fan continuously because the temperature sensing is being done at the return air thermistor inside the unit. Also by design, all multi-zone mini splits will send some refrigerant to all heads in heating mode to protect the compressor which can lead to overheating, especially if the unit is too large for the space. Some manufacturers have the ability to turn off the fan when the unit is satisfied in heating or cooling and this generally fixes the overheating problem, but you would have to add some sort of temperature sensing in the space because there would be no airflow over the room temperature sensor if the fan shuts off.