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Old 01-12-2012, 06:11 PM   #1
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mini split efficiency


I have a Mitsubishi four zone mini split system. The outside unit is 36K BTU. I installed just one inside unit at 15K BTU. I have been running this for 9 months now. It seems to run OK. I still have to install the remaining three inside units.

The Mitsu rep said that I should not run just one zone, but he doesn't know why. Does anybody know the answer to this? (I plan to install the remaining three zones ASAP)

Ron




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Old 01-12-2012, 06:20 PM   #2
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mini split efficiency


May cause it to freeze up from not enough air flow.

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Old 01-12-2012, 06:35 PM   #3
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I speculated that it might be due to the fact that the unit is precharged for four zones, and with only one zone installed, the system is overcharged.
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Old 01-12-2012, 07:13 PM   #4
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mini split efficiency


u speculate right. you can wipe out your compressor.
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Old 01-13-2012, 12:13 AM   #5
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Thank you!
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Old 01-13-2012, 06:36 AM   #6
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mini split efficiency


Take care of them after Japan earthquake part are hard to get and cost more. The building was gone due to earthquake.
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Old 01-13-2012, 06:37 AM   #7
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I'm still waiting on a compressor for a customer since July.
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Old 01-13-2012, 06:32 PM   #8
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mini split efficiency


I just measured the pressure in the gas line at the compressor. The system was working in heat mode at maximum settings. The pressure was 450 psi which corresponds to a temperature of 130 F for R 410a. The ambient temperature was 60F. I don't know if this is excessive pressure?

Does anybody know if this is excessive for a Mitsubishi compressor?

Thanks,

Ron

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Old 01-14-2012, 12:07 AM   #9
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Forgot that this compressor is run by an inverter. It may not develop overly high pressures. I don't know.
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Old 01-14-2012, 09:22 AM   #10
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Sounds like that evap is overloaded.

Could be wrong ....don't know if your unit can gear down to handle so low a load.

But at 60* OD ambient the high side seems high. What was your indoor tmp?
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Old 01-14-2012, 12:07 PM   #11
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Indoor temp was 70F.

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