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1.5 ton straight cool condenser....head pressure good at 250 psig....suction pressure will not go higher than 55 psig....target superheat indicates target suction pressure at 68 psig....o/d coil clean, evap coil clean, no leaks detected....compressor amps out at 7.4 (RLA is 7.4 so its on the money)

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Hello take a evap coil split (return temp vs supply temp) 18*F would be great.If it is lousy the TXV valve is restricting the flow of freon or the filter drier is clogging.Adding freon will overcharge the system and the suction will NOT improve.

Posted on Sep 08, 2010

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65 PSI TO 70 PSI IS THE SAME SUCTION PRESSURE FOR ALL TON SPLIT AC OR THERE IS DIFFERENT SUCTION PRESSURE IN ON CONDITION?


Your suction pressure will always vary depending on many variables. What type of freon??? If you find your freon type on a PT CHART(PRESSURE/TEMPERATURE), 65-70 psig will have a temp that is 38-41°f. Most evap coils should be a bit warmer but not much. BUT, again variables! Coils are clean, indoor temp, blower speed, return air opening, supply ducts. Also superheat should be a factor. If you have 65-70psig, that freon temp(per pt chart r22) is 38-41°f, then using a temp sensor/meter to measure the actual temp of the suction line. Subtract 38-41 from the actual temp and that give us a superheat reading. This # should be around 8-12°. But again variables! If the unit has an expansion valve? Seems like you are close if its r22.

Aug 05, 2015 | Heating & Cooling

1 Answer

R-22 home condenser unit low side and high side pressures when running


Pressures look good but to know if it is charged correctly you have to do a sub cool or superheat to know for sure. Rule of thumb is if turn unit it on let it run 10 minutes. If the suction line sweats and is cold. Might be proper charge.

Jun 24, 2014 | Ruud Central System Air Conditioner

1 Answer

Scotsman ice maker cme 506 makes ice and turns off and blinks refrigeration


First check to make sure condenser fan is running during freeze cycle. Now check to make sure condenser coil is clean. Her is all the specks on the machine.
1. Ice production ( 500 at 70/50
2. BTUs per hour ( 7000)
3. Maximum times in Minutes. ( 50 freeze, 14 harvest.
4. Refrigerant charge ( R-404A ) ( A-D series: AC 32oz, WC 20 oz. E series AC 23 oz, WC 14 oz, F series AC 23 oz, WC 13 oz
5. Suction pressure ( PSIG ) 35-37 - end of freeze, 120-125-Peak in harvest.
6. Discharge pressure ( PSIG ) 240-260- 5 min in freeze.
165-175- minimum in harvest.
7. Metering device.( TXV plus distributor, E series and higher have two TXVs. superheat 3 to 15 deg F.
8. Average comp.amps. 10-11 during freeze, 11-12 during harvest.
9. Batch Weight. 6.5-7 lb
10. cycle time, 23 minutes @ 90/70. 19 minutes @ 70/50

Feb 24, 2013 | Scotsman Ice Maker CM3 30inW Cubed Ice...

1 Answer

Charging chart missing. Goodman 4-ton AC (model CK 49-18) R-22 fixed orifice


Hello, in order to find if the sytem is operating correvtly you should measure the outdoor dry bulb temp and indoor wet bulb temps, this will givenyou a target superheat. Pressures will vary always use superheat. If superheat is higher than target add refrigerant if it is lower remove refrigerant.

Jun 08, 2011 | Heating & Cooling

2 Answers

I have a 4 ton outside and a 5 ton coil inside square footage of the house is 2495 living.my preasures are 75 low side and 225 hi side i'm not getting any flood back is this ok are do i need to add more...


Charging AC by superheat and subcool
First charging a unit by superheat, this is only for Acs with an orifice or capillary tube.
Optimum superheat is 12° to 15° at the compressor or suction line outside the unit.
Hook up your gages and put a thermometer on suction line (large line), start the AC. Measure the temperature of the suction line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant, (you can also use a temperature pressure chart), now read the thermometer, let’s say the suction temperature( the thermometer) is 67° and the saturation temperature (the gages or temp. press. Chart), is 55°, subtract the saturation temperature from the suction temperature, 67°- 55° = 12° superheat.
Charging by Subcooling, this is for Acs with a thermostatic expansion valve, it’s common to see a sight glass on the liquid line (on these units with a sight glass just clear it, when, indoor room is at approximate set point of the thermostat). Optimum sub cooling is 12° to 15° at the outdoor unit.
Hook up your gages and put a thermometer on liquid line (small line), start the AC. Measure the temperature of the liquid line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant,(you can also use a temperature pressure chart), now read the thermometer, let’s say the liquid temperature( the thermometer) is 100° and the saturation temperature (the gages or temp. press. Chart), is 114°, subtract the liquid temperature from the saturation temperature, 114°- 100° = 14° subcool.

Aug 09, 2010 | Amana Heating & Cooling

2 Answers

UNIT IS ONLY 4 YEARS OLD AND IS ON ITS SECOND COMPRESSOR SUCTION PRESSURE SLOW ABOUT GOING DOWN AND DISCHARGE PRESSURE GOES TO 210 THEN WILL DROP TO 200 .UNIT HAS 10 DEGREES SUBCOOLING BUT SUPERHEAT IS...


Hi, sounds as though for this to be its 2nd compressor for such a newer unit, the superheat was not right when the compressor was installed. I don't know what freon you are using the new R-410A or the regular R-22. There's a big difference in pressure, but now I see your pressure reading and its R-22 for these readings.For a 2 ton unit, you would use the superheat charging method for a unit that doesn't use a thermostatic expansion valve ( T X V ) and not the sub-cooling. A 23 degree super heat at that outdoor ambient temperature is way to high for that unit, you will loose the compressor again!!. Super heat killed the compressor is the saying and that's a fact. Suction pressure should pull down just as quick as the head pressure unless the valves are going and weak, or you have a scroll compressor that has a valve plate that is going, or you are low on charge. With a ambient of 95*, you should be at around 270p.s.i. on your head pressure as 210 to 200 is way low. Suction line temp should be around 68 to 70, with a suction line temperature of 50 to 51 degrees, which would give you a 10 to 12 degree F super heat. I don't know when the second compressor was installed, but it has to be low on charge to be such a low head, and high super heat and you will loose this compressor again, its only a matter of time before you have a burnout. It was either under charged when installed, or has a very small leak at one of the joints. I hope the liquid line drier was replaced also. It shows me you have some knowledge on a/c operation, so you need to get that superheat down to between 8 and 10 degrees for this unit to cool properly, and leak check it also. Did you buy a extended compressor warranty? Lets get the head pressure up and superheat down and you should be OK unless the valves or valve plate is weak. Once you loose the valves, you will have a lower than normal head pressure and a high suction pressure. Compressor just won't pull down anymore. I hope I have been of help to you and ask of you to be kind when rating me. I will be here for you if and when you need me for anything.
Sincerely,
Shastalaker7
A/C & Heating Contractor

Jul 02, 2010 | Weather King 10AJA6001AH Air Conditioner

1 Answer

I have a unit that is cutting off and on every 5 minutes, what could cause this? It is running 55 suction and 235 head pressure and working and cooling but every 5 minutes it cuts off and comes back on in...


If this is a R-22 unit the unit is cycling on the low pressure switch. They are usually set to open at 60 psig. Pressure below 55 psig the indoor coil will freeze up so they set the pressure switch to open at 60 psig + - 3 or 4 psig. You either need to clean the coil, filter, make sure the blower is running and at the proper speed or you are low on R-22.

Jan 22, 2010 | Heating & Cooling

1 Answer

Goodman 2.5 ton 14 seer with txv. low compressor amps


no it's good,man. LOL. The RLA is a max not a target. What is the RLA for the compressor?

Aug 12, 2009 | Heating & Cooling

2 Answers

13 degree Delta T


I assume r-22 refrigerant by the pressure... you have a saturate temperature of approximately 41 degree and 71 degrees at the service port this equates to a 30 degree superheat. a condenser saturation temperature of 105 degrees and since the liquid line temp at the service valve is not given only the enterin indoor coil on the liquid line a 96 degree temperature this would equate to a subcooling temperatureof about nine degrees. You have too high of a superheat reading. verify that the bulb for the txv is correctly positioned and insulated. if it is then you need to remove the bulb from the suction line, hold it in your hand to warm it up and see if the superheat changes. you could also have issues with your ductwork. If the supply temperture is around 50-55 degrees then the unit is doing all it can.. Check the txv and the ductwork as the subcooling indicates that the condenser side is doing it's job, but the superheat readings indicate that you are starving the evaporator..

Jul 28, 2009 | Heating & Cooling

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