Hi ,Not sure what I did wrong but I added freon for a frozen Rheem 3
ton central a/c unit, After the ice melted in the aie handler the
pressure on the low side shot up to 100 from 40. I decided to remove
some freon from the unit. I used the low pressure side to remove the
freon . After a while I noticed that I lost about 6 0z. of oil. So I
decided to remove freon using the high pressure side. That worked
alot better with very little oil loss. Finally I got the low pressure
side to about 65 and the unit is working well. I have 2 questions
now., How do I replace the oil back the the central a/c unit? And Why
did the pressure rise after the ice melted in the air handler. Any
advice would help. Ray
"Hi ,Not sure what I did wrong but I added freon for a frozen Rheem 3
ton central a/c unit,"
that should be your first clue , you never attempt to charge a "frozen "system
secondly , how did you know that you lost 6 ozs of oil unless you vented the
refrigerant , and then observed the oil on the ground
you are either a complete idiot or a troll ,
HVAC 101 , never charge a unit when the evaporator coil is blocked or the
rated air flow across the coil slowed.I.e. dirty air filter, dirty coil
,blower motor not running or ice blocking the air flow across the coil.
Why?, the 40 degree evaporator coil/ 68 PSIG suction pressure is all based
on, and determined. coil loading and metering device and equipment sizing.
If the coil is blocked, the refrigerant does not pick up any
heat,subsequently the refrigerant does not change states from a liquid to a
gas. The pressure shown on the suction gauge of your manifold gauge set will
remains low.You continued to add refrigerant to the system until the gauges
show the numbers someone told you. With no air flow across the coil, it will
take about three time the refrigerant in the system as normal. After the ice
melts, as you discovered the system will be dangerously over charged. The
oil sump on the compressor is on the low pressure side (suction , side) of
the compressor. Therefore it stands the reasons why as you Vented CFC's in
the atomosphere that some oil would exit the compressor as well.
Mickey in Charlotte
The only advice you need is to call a pro, and quit fiucking with the single
most expensive appliance in your home......unless you want to fuck it up
worse than what you started with. But if you got an extra $7,000 - $15,000
to throw away on a new system, go ahead on.
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