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Posted by Stormin Mormon on June 25, 2008, 10:37 pm
I service freezer merchandisers, now and again. Leer ice cube chests.
Compressor on top, and coldwall evaporator.
Many times, I've arrived, and the suction line has been frosty. I rinse out
the condensor with some water, and the suction line warms up. The one I did
today, had about 1/4 inch of clear ice around the suction line. I wet
cleaned the condensor. The ice promptly melted off the suction line. Some
minutes later, the suction line started frosting.
Seems like releasing more heat would improve cooling. What's going on, here?
I've got a few ideas, but curious what the *competent* techs on this forum
have to say.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
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Posted by Bubba on June 25, 2008, 11:05 pm
On Wed, 25 Jun 2008 22:37:03 -0400, "Stormin Mormon"
>I service freezer merchandisers, now and again. Leer ice cube chests.
>Compressor on top, and coldwall evaporator.
>
>Many times, I've arrived, and the suction line has been frosty. I rinse out
>the condensor with some water, and the suction line warms up. The one I did
>today, had about 1/4 inch of clear ice around the suction line. I wet
>cleaned the condensor. The ice promptly melted off the suction line. Some
>minutes later, the suction line started frosting.
>
>Seems like releasing more heat would improve cooling. What's going on, here?
>I've got a few ideas, but curious what the *competent* techs on this forum
>have to say.
Wow! You arent really that unknowing of what your problem is, are you?
The line was frosted so you put water on the condenser coil to solve
it?
Im speechless.
Bubba
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Posted by lp13-30 on June 25, 2008, 11:06 pm
Are these cap tube systems? Sounds like it. Think about it--the higher
the head pressure, the more refrigerant is forced through the cap tube
and the lower the superheat. Did you ever look at the superheat charging
chart for cap tube/flowrator A/Cs. Notice the difference in superheat
when the outside temp is 100 as opposed to 60. Same thing. After you
wash the condenser on a non txv air cond check the superheat when the
condenser is still wet and watch it drop as it dries. That is also one
reason you must always check the superheat AFTER you clean the condenser
and it is dry and pressures stabilized -- a dirty condenser can be
masking a low charge. The one that you shortcut and don't will be the
one that bites you in the butt. Yes, I learned that the hard way.
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Posted by Stormin Mormon on June 26, 2008, 8:39 am
Yes, cap tube system. Sorry, didn't say that. That's about what I figured.
I was thinking that the super cooled liquid freon probably didn't flash as
fast. More saturated vapor by down the suction line. But, it makes sense
that the delta p of a hot condensor would feed more refrigerant.
It did take several minutes for the condensor to dry off. And like you say,
it's impossible to get any kind of accurate reading with a wet condensor.
Watch the superheat drop, as it dries? Wouldn't superheat increase, with a
hot, dry condensor?
Short cuts. I hear yah. I've got a mental check list of all the things to
check, while servicing any kind of system. Someday I'll write it all down,
and make a written check list. I'd publish the check list on this board, but
I'd hear from the competent techs that we ought not be teasing the public
with tidbits of information. The trade really requires some training, and
apprenticeship. A little knowledge is dangerous.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
Are these cap tube systems? Sounds like it. Think about it--the higher
the head pressure, the more refrigerant is forced through the cap tube
and the lower the superheat. Did you ever look at the superheat charging
chart for cap tube/flowrator A/Cs. Notice the difference in superheat
when the outside temp is 100 as opposed to 60. Same thing. After you
wash the condenser on a non txv air cond check the superheat when the
condenser is still wet and watch it drop as it dries. That is also one
reason you must always check the superheat AFTER you clean the condenser
and it is dry and pressures stabilized -- a dirty condenser can be
masking a low charge. The one that you shortcut and don't will be the
one that bites you in the butt. Yes, I learned that the hard way.
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Posted by KJPRO on June 26, 2008, 12:26 pm
> A little knowledge is dangerous.
As you have shown time and time again...
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