Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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Working on a pu24ek mr slim the suction is being pulled down to 5 psi yet the high side coming out at 140 psi on other side of cap tube i cleaned the screen going into evap distibuter possible restricted cap tube

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Is the distributor inside the condensing unit on this system? it sounds like it is under charged also check the fan operation on the evap along with the filters and evap not dirty. if all is good i would say low on charge. i never had a restriction in a mini split. check the orifice in the condensing unit

Posted on Jun 05, 2010

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God day,
Some thoughts.
1. Are the evap fan motors running, and at full speed. That would give you abnormally low suction pressure.
2. Cap tube sized too small. or partial restriction in the dryer cap tube/dryer when brazing in the lines.
3. Low ambient. What's the temp the machine is running in.
4. Over sized compressor.
5. Moisture. God, 134A is touchy on that one.
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1 Answer

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The foreign made market is different than the USA.

First if the unit doesn't get a change or input from a manual command (on the remote on mine) it will shut off because it assumes there is no one there.

2nd if it is in the timer mode it may be different in orientation than what you are used to looking at.

TO make sure these are not your problem review the instructions.

If this is R22 or R410A there is not a pressure switch that will cut it "OFF" at 140#. And if your fluctuating tween 30 and 140 It is almost sure its low on charge especially if its new. Now I assume you mean 140 on the high side, right?

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