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Old 07-25-2011, 12:05 AM   #1
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High pressure line (not hot)


My a/c seems to be working fine, but today is was 98'f.

My high pressure line outside is not hot, the low side is very cool to the touch. After checking 3 neighbors units, all their high pressure lines are pretty warm to the touch. My line seems like its maybe 70-80'f,
and the low side is like 40'f

What could be wrong with my unit ?

Seems to cool the house fine, and the unit runs for maybe 10-15 minutes, then turns off and on as its called for by thermostat.

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Old 07-25-2011, 12:23 AM   #2
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High pressure line (not hot)


I'm guessing since I don't know the pressures. Restricted condenser coil or Liquid line dryer, if it is installed inside of the condenser.

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Old 07-25-2011, 12:29 AM   #3
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High pressure line (not hot)


I will check pressure's in the morning...thks..
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Old 07-25-2011, 12:32 AM   #4
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High pressure line (not hot)


Get the temp of the liquid line ( small copper ) after the service valve and before get in the Evap.
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Old 07-25-2011, 12:36 AM   #5
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High pressure line (not hot)


Will do...whats the best way to test for temps ? I have an infra red tester or a meter with temp probe (non clamp on type)
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Old 07-25-2011, 12:41 AM   #6
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High pressure line (not hot)


Infra red should be ok
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Old 07-25-2011, 02:03 AM   #7
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High pressure line (not hot)


Quote:
Originally Posted by JJboy
Infra red should be ok
Infra red doesn't always work on copper. Use a strap on thermometer.
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Old 07-25-2011, 04:47 AM   #8
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High pressure line (not hot)


Temp probe. IR is unreliable on copper lines.

May not be anything wrong with your system.
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Old 07-25-2011, 05:48 AM   #9
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High pressure line (not hot)


If the unit is keeping the proper temps and everything seems in order I wouldn't mess with it.
I would get through the season then at next years startup and maintenance I would have everything checked out.

Maybe all your neighbors units are running hot and yours is normal.
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Old 07-25-2011, 06:41 AM   #10
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High pressure line (not hot)


your condenser is the cleanest of the group the Liquid Line should be slightly warm body temp but it it's hot the condenser isn't being removed and it goes into the air handler on the liquid line....the line right off the compressor to the top of the condenser now that one on a full charge you can't touch...
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Old 07-25-2011, 12:12 PM   #11
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High pressure line (not hot)


How old is your compressor ? The small line should be around 100-110 if outside ambient temp is 98. Does the air blow out of the condenser hot like your neighbor's ?

Last edited by clocert; 07-25-2011 at 12:14 PM.
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Old 07-25-2011, 12:26 PM   #12
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High pressure line (not hot)


the liquid line is high pressure not high heat. the whole point of the condenser is to take the very hot high pressure gas that comes out of the compressor and cool it down to a warm not-as-high pressure liquid as it exits the condenser. my liquid lines are typically only slightly warmer than ambient. you should have hot air blowing out the top as the fan extracts the heat from the line.

if the line is too hot something is wrong.
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Old 07-26-2011, 06:22 AM   #13
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High pressure line (not hot)


the heat difference from the compressor line and the liquid line is what blows in your face....if it is little above ambient on a 90F day your condenser is clean
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Old 07-26-2011, 06:57 PM   #14
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High pressure line (not hot)


Finally got around to test out the pressure's and temperatures.

It was 87'f outside today.

73'f inside the house.

The temperature of the high line (1/4") was 76'f before the valve.

The temperature of the high line (1/4") was 109'f coming out the compressor.

The temperature of the suction line (3/4") was 61'f before the valve.

The temperature of the high line (3/4") was 67'f just before the compressor.

The pressure was 75 psi on the suction line (3/4") with unit running.

The pressure was 240 psi on the high line (1/4').

The air temperature coming out the registers in the house was about 55'f


Does this seem correct ? Or should it be colder coming out the register.

There is about 25-30 ft. of copper line coming from outside to up in the attic.
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Old 07-26-2011, 07:07 PM   #15
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High pressure line (not hot)


Sounds good. Grab a beer and forget about AC

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