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Old 02-19-2012, 05:03 PM   #1
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mini split superheat


I am checking out my Mr. Slim system. The book says, in heat mode, the compressor discharge temperature should be 139 F. I taped and insulated a thermometer to the large line leaving the outside unit, and the temperature is 110 F. Shouldnt this be near 139 F?

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Old 02-19-2012, 05:10 PM   #2
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Why did you even think of doing that? What's the problum with the unit?

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Old 02-19-2012, 05:13 PM   #3
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Thank you. I want to optimize the operation of the system. Also, it seems the air coming out of the inside unit is not warm enough.
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Old 02-19-2012, 06:22 PM   #4
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If you have an inverter unit. It must be at 100% when checking operation.
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Old 02-19-2012, 06:55 PM   #5
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Bingo! It is an inverter unit. I only had one 15K zone running. The outside unit is 36K. I turned on another zone, 9K. The outside thermometer went up to 153 F. As it approached 140 F (the book temperature), the compressor slowed down a bit. The air coming out of the inside units was 103 F.

Both condenser and discharge temperatures are higher than the book values. Maybe there is something wrong. Or maybe this is because I dont have a full 36K load on the system.

I didnt hook up the gages today. Maybe I will tomorrow.

I dont know the logic of the electronic control board. Maybe that is Mitsubishi proprietary. I suppose the several thermistors are the primary control factors.

Thanks!
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Old 02-19-2012, 07:53 PM   #6
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Your welcome. The temps they publish, are at full load.

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