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Old 12-18-2011, 10:57 PM   #1
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which refridgerant lines are operational on ac


I have removed concrete floor and located two sets of ac lines from the compressor. How do I determine which set is actually to the evaporator? Shadowbuilder.

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Old 12-18-2011, 11:03 PM   #2
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which refridgerant lines are operational on ac


Most likly they both are, ones high pressure and ones the suction line, or return line.

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Old 12-18-2011, 11:06 PM   #3
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which refridgerant lines are operational on ac


if there are two sets than there'd be four lines total. if this is the case pressurize the lines, nitrogen, at the condenser.

you can unscrew the connection at the piston in the evaporator
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Old 12-18-2011, 11:09 PM   #4
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which refridgerant lines are operational on ac


only use nitrogen if the system is empty. if the system is operational, turn it on in a/c. the larger line, which should be insulated, should be cold to the touch and the smaller high pressure line should be warm to hot.
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Old 12-18-2011, 11:17 PM   #5
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which refridgerant lines are operational on ac


do you have 1 0r 2 linesets at the condensor outside and coil or coils on top of furnace?
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Old 12-18-2011, 11:57 PM   #6
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if there are two sets than there'd be four lines total. if this is the case pressurize the lines, nitrogen, at the condenser.

you can unscrew the connection at the piston in the evaporator
Thanks. Turning on the ac and checking temp on each line(gas and fluid) with my hand seems most logical and easy. Can I get the ac to turn on at 40 degees F?
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Old 12-19-2011, 12:02 AM   #7
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which refridgerant lines are operational on ac


If by thermostat than not if it's 40 degrees in your home. most thermostats won't recognize that low of a temperature. You can bypass the stat though but I doubt it's 40 in the home so just drop temperature set point all the way down.
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Old 12-19-2011, 12:03 AM   #8
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which refridgerant lines are operational on ac


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only use nitrogen if the system is empty. if the system is operational, turn it on in a/c. the larger line, which should be insulated, should be cold to the touch and the smaller high pressure line should be warm to hot.
Sort of like plugging in a radio then flipping the breakers to see if you have the right circuit? Will the ac chill at 40 F? Thanks.
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Old 12-19-2011, 12:11 AM   #9
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which refridgerant lines are operational on ac


it should blow out cold air.
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Old 12-19-2011, 12:13 AM   #10
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Most likly they both are, ones high pressure and ones the suction line, or return line.
Sorry I was't clear. One set goes through the ceiling and the other lays on the ground. I want to get rid of the set on the ground. Thanks.
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Old 12-19-2011, 12:17 AM   #11
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which refridgerant lines are operational on ac


how many lines are going up to the coil?
i did actually see a residental unit years ago with 2 liquid lines and 2 suction lines,it was an old unit with outside coil mounted at an angle and 2 a coils on top of furnace
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Old 12-19-2011, 12:23 AM   #12
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do you have 1 0r 2 linesets at the condensor outside and coil or coils on top of furnace?
As best I can see only two lines to the evaporator coil, one bare copper and one copper insulated. Also, ther are only the two lines outside from the compressor coming into the house at at a point immediately below where lines can be seen in the ceiling. Thanks.
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Old 12-19-2011, 12:26 AM   #13
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which refridgerant lines are operational on ac


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As best I can see only two lines to the evaporator coil, one bare copper and one copper insulated. Also, ther are only the two lines outside from the compressor coming into the house at at a point immediately below where lines can be seen in the ceiling. Thanks.

someone kill me now.

doOd, that is not two sets, that's the ONLY set.
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Old 12-19-2011, 12:33 AM   #14
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If by thermostat than not if it's 40 degrees in your home. most thermostats won't recognize that low of a temperature. You can bypass the stat though but I doubt it's 40 in the home so just drop temperature set point all the way down.
Surprise! I'm renovating the place with doors open and no heat. Right now it's about 45(11 p) outside but it will be 26 F in the am. But not 26 F in the house. I'll try your suggestion and see what happens.Thanks again.
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Old 12-19-2011, 12:33 AM   #15
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someone kill me now.

doOd, that is not two sets, that's the ONLY set.
ive only actually seen it once ,thats why i wanted to make sure!
although ive never seen a lineset run under a concrete slab before

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