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My train air unit cools at night but during the heat of the day it takes all it can do to keep the apartment around 80 degrees the maintnance man at work said the low pressure was at 80 and the high was at 350 which he said was a little high but he dont know why he did mention something about a txv some kind of valve but i really think hes lost please help

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The pressures arehigh no doubt about it.

help your tech out then if you think he's lost.
go to the store and buy a couple of cooking thermometers.put one in the supply vents, the ones that blow.put the other one in the return vent, the one that sucks.may as well pull the filter out to temporarily...that way you can check it to see if it is clogged.

set your t'stat low so it should run for awhile.after 10 minutes run time record the return temp from the therometer.right after that do the same with the supply.subtract the return temp from the supply temp.you should have 17 to 20.this is your temp split.do it again after 30 minutes running.should be the same.

do it again when you are home during the time of day when your machine is struggling.if you dont have that 17 to 20 degrees difference, your a/c comp shut off due to a h.p. switch or o.l. switch.if these switches open, the fan on your outdoor machine will still run unless it is ruud/rheem.these switches reset themselves after time, unless it is a ruud or rheem,or lennox.

another possibility is that the evap coil iced. you the tenant can check this easily too.you will notice it this way...go to the supply in the grills in the morning, the ones that blow. put your hand up to them and kinda remember how hard they blow.do this again when you notice your a/c struggling during the hot part of the day...if it is weaker the evap coil is icing. if nothing at all, then it is probly totally frozen or your indoor blower is shuting off due to an o.l. switch.it will reset when it cools for awhile.dirty filters can actually cause both of these problems.

make sure your tech waits 15 minutes before he just says the readings are high. the machine needs to run awhile.if your apartment is boiling, this can make the pressures a little high.in the meantime he can check your temps.if your a/c coil is dirty, the machine out side...pay him to clean it.all he needs is a garden hose.this should help lower pressures a bit.

but in my opinion, you probly have multiple problems contributing to this. the first is lack of maintenence. the other is air and non-condensibles in your refer/freon lines.

Posted on Dec 29, 2008

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With that reading on the psi it sounds like it's doing all it can. maybe too small or lost it's capacity to cool your home.did it do ok last year? is the ducting ok? may need a pro to ck it dan

Posted on Jul 24, 2008

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