Question about Amana PTH123B25AJ Heat Pump Air Conditioner

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Charging a ptac

Im tring to charge a ptac unit should i do it by superheat or by label on the unit?

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Either or, they both are the same ends but different routes..

Posted on Sep 08, 2008

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Compressor shut off for no reason


You need to to determine the superheat and subcooling to check for the proper operation of your system when the compressor is running. I ran into a case just yesterday, the breaker kept tripping. Unit had the same readings as yours. This one had a subcooling of >25 degrees and 0 degrees superheat indicating unit was overcharged. I took an extra 8 pounds of r22 out of the system. During the investigation I also determined the filter/drier was blocking the refrigerant flow causing the technician to overcharge the unit. To check filter/drier performance all you need to do is measure the upstream and downstream temperature. The difference should be less than 2 degrees. This one was 7 degrees indicating it was metering flow. If your compressor stops operating before determining superheat and subcooling, you can get a professional tech to recover and weigh out the refrigerant in your system. You can look on the nameplate data on the side of the outside unit and see the ounces of refrigerant it is charged. If the compressor is operable go ahead and adjust charge by recovering the excess refrigerant into a recovery container for that refrigerant. Normal superheat and subcooling is normally around 10 - 15 degrees.
Hope this helps

Jun 20, 2014 | Goodman CLQ36AR49 Air Conditioner

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Charging an air conditioner by superheat or subcooling


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). If there is no sight glass then the 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.

This is also the only way to know if your a/c has the proper charge.

on Dec 28, 2009 | Air Conditioners

1 Answer

How do i trouble shoot/fix m1400 frosting pipe reezing up outside not cooling house


Get a high velocity air filter, not a pleated one. Check air into evaporator section clean and passing air well. Next, check proper operation of blower motor and wheel. Next, check for proper charge by performing a superheat and subcool calculation. You will need a repairmant to check these. Superheat and subcool will tell you if your unit is properly charged and if you metering device is working properly. A typical superheat and subcooling value is around 10 to 15 degrees.

Jun 05, 2014 | Rheem Air Handler 4 Ton With Rhplhm Series

1 Answer

Ihave 50 ge ptac units that only the middle of evap.is getting cold


short of gas. Check for leak and arrest it. Then vacum and do gas charging.

Aug 18, 2012 | GE Zoneline In Wall Ptac Unit Air...

1 Answer

Have Ptac units that work fine one minute and 2 hours later just blow warm air.. some that also freeze up the front coils


I think your PTAC is under charge, if the air filter is clean and the evaporator is also clean together with the blower. Check the freon charge and refill if suction pressure is below 50psi and discharge is below 190 psi.

Sep 03, 2011 | Amana Air Conditioners

1 Answer

Need to charge unit


look at the data plate on the condenser and it will give you the factory charge that was put in unit when it was built. You will need to do superheat and sub cooling to make sure the charge is correct if it's a newer system. You might want to call a A/C company to due this for you. Good luck

Apr 25, 2009 | Air Conditioners

2 Answers

How panasonic charging by superheat


Not exactly sure of the question. You can charge any aircon by touch alone, just by feeling the return or suction side tube temperature. But generally you could also work on a 60psi backpressure.

Mar 19, 2009 | GE Quiet-Aire Ductless Split System Air...

1 Answer

Charging a ptac unit?


Full service both coils first ,add your filter, then add a line temperature probe in the supply air flow or on the line going to the compressor add freon till you get the lowest temperature nad then it will start to climb, you've had the correct charge,!

Sep 08, 2008 | GE Zoneline AZ55H07D Air Conditioner

1 Answer

How to charge coleman mach-3 a/c roof unit 134 or 22


If it needs a charge the leak has to be found and fixed. If the leak has been fixed and you have a service valve on the low side. It should have a vacuum pulled on the system to remove all air and non-condensable gases from the system. Then you can charge the system : 1. by weight according to the name plate. 2. charge by superheat (temperature leaving the evaporator + 16°F) When using the superheat method to charge the higher the Ambient temperature the lower the superheat difference will be.

May 01, 2008 | Air Conditioners

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