My sanyo split rotary airconditoning unit is icing on the high pressure side tube and doen't cool much .. I tried to recharged with freon 22 but it didnt really improved much .. current is low at 7A instead of 10.2 ., compreesor thermal overload trip after some time . please advise..
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Re: Sanyo split high pressure side tube icing
Ok, on these units, if by high side line you mean the small tube going from outside to inside, that tube is actually on the low side, the metering device is in the outdoor unit. If you shut the unit down, let everything thaw then restart and find that small tube is freezing up right at the outdoor unit right away, my guess is its low on charge. I see that you put some in, make sure it is the right knid of refrigerant. they do not hold alot. Where is your suction pressure running. If you put 2 to 3 pounds with no change, you may have overcharged but that is telling you that there is a restriction in the line inside the outdoor unit, probably the filter if it has one, or the metering device itself. Let me know what you find.
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there is no suction at all when the machine is off as the gas equalizes around the system
all you will read is the pressure of the gas in the system and that will tell you nothing
to read gas pressures you need to know the type of gas in the system , have gauges that can handle the high pressures and have two on a manifold so that you can read suction and high side pressure differences
That way you can see if the system is low on gas or over charged
The pressure changes with temperature, it is not a true gauge to ensure a proper charge.
You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)
Can you verify that the compressor is running?
Not the condenser, but the compressor located inside the condenser (outdoor unit)
it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.
( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)
sound to be in heat modenow. If you are after the cool mode, then if you have a cool setting and a heat temp setting, Lower the heat to almost off and set the cool setting to 74 degrees. See if the outside coils get warm. Make sure you are off manualo and n auto. If it runs, give it some time and the tenp of the outside coil will rise and the inside will get cold. Food Luck
I work on and like the sanyos.Yes there is usually a crankcase heater and fan cycling controls.As far as efficiencies.....thats up to what you wanna spend upfront or on electricity later on.Im in Ohio.
Your suction pressure is erratic, your max. pressure is to much high. You did not measure your unit current reading liquid line press. to complete the data. But the problem of your unit is not the compressor its the system. Try to reprocess the system flush the unit with nitrogen, isolate the capillary tube and flush it with nitrogen to insure that no restriction.