Question about Goodman CLQ36AR49 Air Conditioner

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No suction pressure at condenser test port

I changed out r22 condenser unit , I installed a used working trane Xl-13 . I have 150 psi on high side port and little to zero pressure on low side test port. Is it possible that trash could be against low side service valve. Or incompatibility with air handler and condenser unit? It was around 70 degrees outside

Posted by Anonymous on

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  • Goodman Master
  • 1,363 Answers

I would suspect the valve on suction side not open. if the other system failed on a burn out you could have a blocked dryer or orfice at coil.

Posted on Aug 09, 2015

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Posted on Jan 02, 2017

  • 14 Answers

SOURCE: 5 year old Goodman CKJ48-1A Condenser Unit

do what they said also when those pressures equalizing it might be your compressor going out

Posted on Oct 16, 2008

  • 587 Answers

SOURCE: I am working on a

It sounds like you are low on charge. I think you have a thermostatic expansion valve and you need to check the subcooling, you should have 12 to 15 degrees at 95. At 95 degrees your head should be about 280# for a 12 or 13 SEER unit or higher depending on the effeciency. At 78 to 80 degrees indoor depending on the humidity, that is normal. The valve will open to try to fully feed your indoor coil and it sounds like your head pressure is to low to force enough refrigerant thru the coil.

Posted on Aug 18, 2010

  • 157 Answers

SOURCE: I had my GSC13048AG aicr

I believe He is talking about the suction pressure, not head pressure which runs much higher, he's likely correct but this symptom could be due to several things, discuss it thoroughly with your service provider

Posted on Jul 26, 2011

  • 1 Answer

SOURCE: what should the suction and high side pressure be

r22 3ton what should high low side pressures be

Posted on Aug 04, 2011

  • 2 Answers

SOURCE: hello, my HVAC is constantly

I'm new at this and I can't tell how old the post is but I'll contribute anyway.
You probably have fixed the problem by now. I wonder what part of the system is freezing up. I don't have a lot of experience but I know you can get frost where there is a restriction in the freon. If the freon line filter near the outside unit has frost on the house side the filter is partially plugged. I have also seen fost on the evaporator (attic "A" coil) when there is a shortage of return air flow. You could have a plugged filter or colapsed return duct, or even an "A" coil with a lot of dust covering and plugging the fins. I guess restrictions in your room air supply registers could cause the problem too. Maybe you have most of the vents closed off to save energy. Just some possibilities.

Posted on Oct 31, 2012

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1 Answer

Low to zero pressure on low side test port


150 is low for high side pressure. may have to add more r-22 to system. if you had a blockage high side pressure should be higher. have you turned both service valves at condensor ccw completely?

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R22 need diagnosis please


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Dec 11, 2013 | Heating & Cooling

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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

I use to do a/c work many years ago, forgot a few things. like what the pressure should be on the low side, 88% out side 77% inside do you have an approx. psi. using r22


The back pressure on the suction side should be around 65-70 psi with R-22. Make sure the condenser coil is clean and that the condenser fan is working ok.

Also be sure the indoor filter is clean and that fan is running on high speed.

Jul 22, 2010 | Whirlwind FH-778 Air Conditioner

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How do you check to see if the high side is leaking back into the low side on a scroll compressor suction pressure is 90psi R-22 suction line is warm but not hot


90 psi is very high for R22....low for R410 refrigerant. If leaking by the head pressure and suction pressure will be close to to the same reading

May 10, 2010 | Heating & Cooling

2 Answers

HOW TO RECHARGE SPLIT TYPE AIR CONDITIONER WITH USING r22


check cooling coil(in door unit)if there ice buil up then feel air vent if no air mean your fin block aready need to clean / air vent ok meant there have a leak .you need r22 test gauge and hose,reamer,tube cutter and flaring kit. 1)check suction pressure(big tube at out door unit) remove 2 way cap and 3 way cap valve then connect blue hose at service port 3 way valve (port locate at left or right depent on manufacturer) you will get pressure about 40-45 psi(air cond is running) then use a allen key(hexagonal wrench) to close 2 way valve(small tube or gas discharge side) wait 1-2 minute then close 3 way valve (suction tube or big tube) IMMEDIATELY SHUT OFF AIRCOND AND PLUG OUT POWER CORD (you need 2 person one at in door unit and the other at out door unit). this method is to keep remaining gas inside the compresser.Then leak check ,open 2 way valve about 90 degree hold it for 10 minute then close it .MEASURE THE PRESSURE keeep it for 5-10 minute. If the pressure indicate not same during the first time measured it meant there have a leakage, for air cond 1- 5 year the leakage will happen at the copper tubing connection and improper flaring .Then U need to clean in door and out door unit ,used a spanner or wrench to losen the copper FLARE NUT at out door unit and in door unit( inside insulation) then use pvc tape to cover all copper pipe/tube hole to prevent dirt go inside tube/pipe. Then lift up out door unit and used coil cleanner ditergent wait 5 minute then flush with water. Remove indoor front panel then disconnect out door unit cable at front panel in door unit then lift up indoor unit to disangage the hook and pull out the indoor unit, then clean the cooling coil ,cover electrical part with plastic .last step u need to cut (used cooper cutter)the copper pipe/tube FLARE NUT connection low side(big tube) and high side(small tube) in door connection and out door connection .Then u need to remove the burr from cut edge using reamer make sure metal powder not goes in Then make a flare after inserting FLARE NUT onto the copper pipes Then U can install back the unit check the low side pressure if the pressure 55-67 psi no need to charge

Jul 03, 2009 | Heating & Cooling

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need to know the room temp and out side temp but the expansion valve could be sticking open or the compressor could have bad valves hook up hi side hose to true high side port and shut the liquid valve off in the line set in cooling mode make call for unit to come on and as it pumps down the hi side should go up if not the comp is week but if room temp is 85 or higher and out side about same still low on charge the suction will fall when room cools and the expansion valve quits flooding the coil

May 10, 2009 | 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

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