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Posted by Stormin Mormon on October 13, 2008, 9:37 am
Oh, forgot to answer your question. "What to do next". Follow the liquid
line, and replace anything with a solder or braze connection. Filter dryer,
and then pull apart the connection where the liquid line goes into the
evaporator. Look for signs of liquid line blocked by solder or braze. When
you put everything back together, make sure the lines are as horizontal as
possible, so excess bonding metal drips out instead of clogging the line.
There is a small chance you have a defective filter drier, either in the
condensing unit case, or maybe in the line between the condensor and the
evaporator. Small chance also that you negelcted to open the liquid line
service valve. You may also have a clogged orifice "piston" in the
evaporator. Or bad TXV.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
running amperage rapidly goes from 12 to 15 to 23 amps and higher them
the compressor starts bypassing - this happens in 2- 3 seconds. During
Never experienced this before - what am I
missing?
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Posted by Stormin Mormon on October 13, 2008, 8:05 pm
You're not telling us what was happening on the high side. What were the
pressures? Did it run up to 400 before the safety valve started to recirc?
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
Oh wise men of the alt.hvac newsgroup
I checked the ports to make sure they were open, verified the
capacitor mF and looked for any other things I may have done wrong. I
must also admit that originally I thought maybe the parker port was
stuck so I installed a piercing valve between the compressor and the
port on the liquid line to see if there was a pressure difference -
what a waste of time. Never experienced this before - what am I
missing?
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Posted by on October 14, 2008, 3:11 am
On Mon, 13 Oct 2008 20:05:53 -0400, "Stormin Mormon"
>You're not telling us what was happening on the high side. What were the
>pressures? Did it run up to 400 before the safety valve started to recirc?
Maybe I wasn't clear.
This is what happens when the condenser is off both high and low
pressures are at 150 lbs. When the contactor pulls in the high side
stays about the same 150 lbs or it may drop slightly 4 or 5 lbs. This
is what is strange. Normally it takes about one or two minutes for the
pressure to increase to the point that the bypass opens in the
compressor. But the compressor starts bypassing 2 - 3 seconds after
start up. The suction side drops about 25 -30 lbs before the
compressor starts bypassing. When this first happened I thought the
liquid line valve was stuck even though I opened with my Allen key. To
check this I installed a piercing valve on the liquid line on the
compressor side of the back seating valve thinking the pressure would
be much higher if the valve was stuck. After connecting my gauges to
the new port I found the pressure was the same. BTW if I leave for a
day and let the unit sit it still bypasses on the first try the next
day in 2-3 seconds.
Thanks, Vance
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Posted by Steve on October 14, 2008, 8:25 am
> On Mon, 13 Oct 2008 20:05:53 -0400, "Stormin Mormon"
>>You're not telling us what was happening on the high side. What were the
>>pressures? Did it run up to 400 before the safety valve started to recirc?
Stormin, maybe someday when you have a clue.....
> Maybe I wasn't clear.
> This is what happens when the condenser is off both high and low
> pressures are at 150 lbs. When the contactor pulls in the high side
> stays about the same 150 lbs or it may drop slightly 4 or 5 lbs. This
> is what is strange. Normally it takes about one or two minutes for the
> pressure to increase to the point that the bypass opens in the
> compressor. But the compressor starts bypassing 2 - 3 seconds after
> start up. The suction side drops about 25 -30 lbs before the
> compressor starts bypassing. When this first happened I thought the
> liquid line valve was stuck even though I opened with my Allen key. To
> check this I installed a piercing valve on the liquid line on the
> compressor side of the back seating valve thinking the pressure would
> be much higher if the valve was stuck. After connecting my gauges to
> the new port I found the pressure was the same. BTW if I leave for a
> day and let the unit sit it still bypasses on the first try the next
> day in 2-3 seconds.
> Thanks, Vance
2 things to do.... first, when you attempt to start the system, check the
filter/dryer... whats the delta T across the filter/dryer?? 2nd, pump down
the entire system, pull a proper vacuum(400microns) and weigh in a new
refrigerant charge.
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Posted by Stormin Mormon on October 14, 2008, 8:44 am
Ah, you're just jealous.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
Stormin, maybe someday when you have a clue.....
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>pressures? Did it run up to 400 before the safety valve started to recirc?