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I have a suction line, liquid line and a third line for liquid; what is the proper gauge hose hook-up? Thanks

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What type of unit are you working on?

Posted on Apr 10, 2011

  • Roger Jelinek Apr 10, 2011

    Sorry, that question should have been under a different heading.

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1 Answer

How do I replace a outside central air conditioner


First you need to determine if it is a heat pump or straight cool condenser. The reason is the low voltage wiring is different. This is the correct way to install an outside unit.
1.Pad must be level and unit should be secured to withstand 140 mile uplift wind with tie down straps.
2. Make sure breaker size does not exceed max per data sticker on unit. The electrical whip should also be correct wiring size for breaker AMPS.
3. Remove the shard er core valve to prevent damage to it, protect king valve with wet cloth or thermal trap paste to avoid damage. Connect the liquid line small cooper pipe to unit by brazing. Then run through gauges Nitrogen at low psi to prevent shoot build up in line set, now start brazing the suction line large cooper pipe, once finished help cool with water cloth.Check visually for any missed spots and re braze. Once you are comfortable that braze is a good seal now it it pressure test time.
4. (The above procedure is assuming that the inside unit has already been installed correctly, including the line set to unit.)
Through gauges connect Nitrogen compressed gas tank and increase psi in the line set to 350 psi and let stand ten minutes. If pressure is still 350 on both gauges you have a good seal, release the nitrogen into the air and remove tank from hose. Once gauges read 0 psi on both sides high and low you can start the vacuum process. These pressures can differ per refrigerant ( R410A example).
5. Hook up the Vacuum pump to the middle hose from gauges making sure you have replaced the shard er core valve back into the ports.tighten all hoses to any connection on machine, gauges, and pump open gauges and turn on pump allow to run at lest 20 minutes or until you reach 100 microns in a vacuum.Shut, close gauges and shut off pump remove the hose from pump.connect this hose to refrigerant tank and purge to center hose at gauges ( minus) amount of purge.
6. Now you can open the king valve and let refrigerant flow out of the condenser into the line set and air handler otherwise you have to add the refrigerant, newer refrigerant has to be charged into unit in the liquid state not gas state. R410A older refrigerant can be charged in gas state R22.
7. Hook up electrical,breaker off check with volt meter, follow diagram on unit. Then hook up low voltage, for straight cool depends on t-stat and unit witch colors they use follow schematics. I have found that Goodman use blue as common and yellow for cool, make sure that the same colors are used in the air handler to provide the 24 volts to outside contact coil.
If this seams difficult, well it is unless you have the correct training incorrectly done can cause damage to unit and to personal health ..
8. Or call a professional HVAC tech.

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Sep 20, 2014 | Goodman Heating & Cooling

1 Answer

Refrigerator not cooling


You can tap the suction line coming from the freezer or tap the process tube on side of compressor. The discharge line is what goes to the condenser coils. If the refrigerator hasn't lost Freon yet I do want you to be very careful. The suction side if working properly will pull air inside the sealed system if the gauge and lines coming from your gauges is not purged properly.
Thanks, John Tripp Appliance 911

Feb 03, 2014 | Whirlpool Refrigerators

1 Answer

Goodman unit runs and at the a-coil there is a piston where your suction and liquid lines connect. On the liquid side the piston is cold but warm on the other side of piston. A/C unit will not cool.


That piston is the metering device. On the liquid line, before the metering device it is always warm (this is sub cooled, high pressure liquid), but should flash to low pressure, lower temperature vapor once it passes through the metering device. The suction and liquid line never connect together.The liquid line brings liquid from the condenser to the evaporator. The suction line brings super heated vapor from the evaporator to the compressor. Since the unit does run, I'd have to put a gauge on it,but if I had to guess, I'd guess you have high head pressure. Check for dirt or debris on the condenser, check for proper clearance of the condensing unit and check for operation and directional rotation of the condenser fan. This could also be the result of an over charge.

Aug 26, 2013 | Goodman CKL36AR36 Air Conditioner

2 Answers

How do you put in 410a into Ac unit


You turn system on to cool setting and run temp down until outside unit comes on. Then you connect your suction side of your gauges to the suction side of your outdoor unit. Next you connect the liquid(high)side of your gauges to the liquid line on your outside unit(the little copper line). Connect the middle hose of your gauges to the 410a drum of refrigerant. Before opening the suction or low pressure side of the gauges you need to turn the drum upside down and turn drum of 410a on. Then you need a temp reading meter and clamp to read the temp of your liquid line(small line). While charging you want to make sure to release refrigerant slowly. The unit should call for a specified subcooling on unit plate. 7 to 10 degrees. You take the liquid line temp and subtract it from saturation temp on the high side of your gauges.(it'll be the pink numbers on the right side of your gauge.

Jun 05, 2013 | Heating & Cooling

1 Answer

Hoi... We have a Condura split aircon of 1.5 hp. 12.000 Kj/hr -R22 The in- and outset unit needs cleaning and has to be disconnected from each other. Here's my question: After connecting again and...


Hi Frans! I'm Roger. I have never had to disconnect the Evaporator from the Condenser to clean them but here is your answer. Use the access valves on the liquid side of the condenser. After evacuating, let the vacuum pull liquid R22 into the liquid line access valve to about 80 gauge pounds and close your refrigerant port on the manifold. Start the unit and add GAS to the suction port to bring your pressure up. If you have a scroll type compressor you can add liquid to the suction port but add gas just to be safe. Exactly how much you add depends on the efficiency of the compressor and how cold you want the discharge air to be. Normally we shoot for 34 to 40 degree evaporator with 18 to 25 degree temperature drop across the coil. R22 at 34 degrees is 60.2 PSI (Pounds per square inch) on your compound gauge. That's normally blue and on the left side of the manifold. The gauge that's hooked to the suction line. 40 degrees is 68.6 PSI. The amount it will take depends on the size of the condenser and length of your line set. Watch the amp draw on the compressor while charging. The name tag will have an RLA or FLA number that is the normal operating amperage of the unit. Add gas on till the suction line is cold at the compressor, then wait 5 or 10 minutes for the system to stabilize. Adjust you pressure again and you should be done. Let me know if you need anything else and if so, be as specific as possible. Roger

Apr 20, 2011 | Heating & Cooling

1 Answer

Hi, I need to relocate the split air conditioner, but I don't know the first step and next steps. Thank you,


If you are not a service technician you probably won't have the tools you will need to accomplish the move. Here is what it takes, step bye step. 1. Pull the fuses or turn off the electrical breaker in the house. 2. Hook up a gauge manifold to the Condensing unit ports for the liquid and suction lines. 3. Hook up a Refrigerant recovery machine to the manifold. 4. Recover the refrigerant into recovery tanks down to a trace, no vacuum. 5. Disconnect the electrical whip and control wiring from the condenser. 6. Close off the service valves on the liquid and suction lines at the condenser. 7. Slowly unscrew the copper line connections to the condensing unit to relieve any pressure that may exist from Refrigerant boiling out of the oil in the compressor and quickly cap them. 8. Move the unit to your new, firm and level location. 9. Remove the old electrical disconnect and whip and move it to the condenser. 10. Buy a new line set of the proper length or extend the old one with Refrigeration copper and couplings preserving the condenser couplings. 11. Replace the liquid line drier and reconnect the copper lines to the condensing unit. Replace the "O" Rings if needed to insure a good seal. 12. Hook up a vacuum pump to your gauge manifold. 13. Open the isolation valves on the condenser. Depending on the oil type in the system, evacuate to 250 Microns. 13. Charge system with 50 pounds of Nitrogen and a little Refrigerant for a trace test. 14. Watch your gauges for a drop in pressure indicating a leak. 15. Check all fittings and any splices with a good Halogen gas detector. 16. Evacuate the system again to the point of vaporization of the oil in the compressor being careful not to boil it off. 17. Close off all ports on your manifold and install a small drier to your Refrigerant line. 18. Re-install the recovered Refrigerant, running it through the small drier on your manifold. 19. Re-check for leaks. 20. Install the electrical whip on the contacter and the control wires on the contacter coil. 21.Start the AC and check the running amps against the name plate Full Load Amps (FLA) or Regular Load Amps (RLA) and check the Refrigerant charge against the units chart. Either in your owners manual or glued to the electrical access cover.
Method 2 = Instead of recovering the refrigerant, you can pump it into the condensing unit. With your gauge manifold tied in, close the liquid line isolation valve. Run the compressor till the compound gauge reads 1 pound and close the suction line isolation valve. Doing it this way will eliminate the need for the recovery machine and heavy tanks. All else remains the same.
Special tools needed = Compound gauge (meaning it reads both pressure and vacuum). High pressure gauge, gauge manifold and at least 3 hoses, a vacuum pump, leak detector (or soap bubbles) and an amp probe. Please rate this response. Thanks for asking!

Apr 01, 2011 | Heating & Cooling

1 Answer

I want to change the location of my split ac from one room to another kindly give me easy instruction


Power on. Let compressor starts in cool mode. After 5 minutes, close liquid line with proper Allen key and check your gauge becomes" 0" in suction line. Power off immediately. And start closing suction line with proper Allen key. Now, all gas has been pump down in condenser unit. Separate the pipe lines by removing flare-nuts . And also remove flare-nuts connected with indoor. Disconnect drain line and thermostat wire which comes from indoor to out door. Remove Indoor by hooking up and remove gently towards your chest. Nowyo can re instal your unit wherever you want.

To pump down:
http://www.youtube.com/watch?v=U8o5g4dVP5o&feature=fvw

To Install split a/c
http://www.youtube.com/watch?v=fEppTCPBkOU&feature=related
Hope it's helpful?

Jan 31, 2011 | Heating & Cooling

1 Answer

How to hookup refrigerent gauges to central air?


Outside in the condensing unit you'll see the two copper pipes coming from the valves in the condensing unit. atach the hose from the high pressure gauge to the port in the smaller copper pipe (liquid line) and the other hose to the port of the other line (suction line) in there you check the low pressure (68psi) and if is low you can rechrge it, in the high side you should have no much more than 250psi .This pressures are for R22.

Apr 25, 2009 | Heating & Cooling

2 Answers

A/C NOT COOLING


I am thinking more along the lines that you have a restriction somewhere in the condenser sheet coil, or the condenser line coming from the compressor. If you have no suction pressure this would explain a restriction.

May 28, 2008 | Intertherm P3RA-048K Air Conditioner

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