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Carrier 48TMD006 RTU DT ONLY 15 DEG ADJUSTED FAN FREON LEVEL SUC 85 HEAD 298 95 OSA SUC TEMP 62 EVAP DROP IS 79 RET 65 SUPPLY RECP COMP JUST DONT KNOW

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What's the problem?With a 79 return humidity is prolly very high.Are you shutting this off at night or letting it maintain comfort levels?

Posted on Aug 03, 2008

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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 | Air Conditioners

1 Answer

How 2 add r22


The best way is weigh in a charge. of course the type of unit will come into play as split systems have enough refrigerant factory for up to 15 ft lineset or so, depending on units make etc. If a charge exists already and requires adjusting due to lineset length, or repairs etc, youcan simulate a 95 degree day ambient outdoors by restricting the air flow a bit to artificaially raise the head pressure as do low ambient controls, thus bringing the head to around 270lbs in a r 22 system or ambient plus 30 degrees , converted to prressure, so a 95 deg day plus 30=125 deg converted to pressure is 269 lbs, the indoor air temp being clse to 80 degreees helps, the indoor coil will be 40 degrees cooler than the indoor ambient if all is normal and design conditions are met by God or you. If the indoors 75, go to a 35 d
eg coil temp this is ball park, as the subcooling (15 deg)and superheat (10 at the evap coil, 20 at compressor) will need to be monitered along with amp draw and Delta T or temp differntials suply vs return.2_25_2012_2_55_05_am.png

Feb 24, 2012 | Air Conditioners

1 Answer

Not sure the heat pump is producing enough heat


lower the fan speed to low and if you do not close your turns at 50 degrees Celsius then check the freon

Nov 04, 2011 | Air Conditioners

1 Answer

No cool air is coming out of vents. Checked Filters OK, Cruited breakers OK, vents OK not blocked. Could it be low on freon and compressor froze up and I should wait for ice to melt than possibly get...


Yes let the ice melt on the evap coil and the outside line. You either have a low charge or you might check your filter dryer on the outside lines this could be stopped up. you will will have a temp drop across the filter if it is stopped up. If not it is possible to be low on charge. Is the inside fan turning and turning the right direction. If the inside fan is not turning it will cause the evap coil to freeze up.

Jul 27, 2011 | Carrier 38CKC030 Air Conditioner

1 Answer

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,...


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.

Sep 08, 2010 | Air Conditioners

1 Answer

Can't get temp drop coming out of Carrier unit...drops about 5 degrees only...adjusted freon, fan, still no results can you help? third visit to home


If this is a heat ump or electric heat check to see if heat strips are stuck on. Put amprobe on main wire to air handler when running. Very common problem. Rus

Aug 19, 2009 | Air Conditioners

1 Answer

System not cooling space it cooled once before?


Hi, could be compressor loosing efficiency, i think suction pressure is to high at 85, also it could be moisture in your system, did mechanic replaces filter drier on high side of system , when he replaces evap. install filter drier on liquid line, if there isn't one, also check compressor valve, you can do that by cutting or desoldering the high side from compressor, connect charging port to compressor, conect your gauge charging port, start compressor, pump up to between 150- 200 psi shut off gauge, and leave for about 1 hr. then check pressure, if pressure decreases, then your compressor valve are leaking, if it maintain same pressure, then compressor valve is o/k. you can do same on suction side, this time in vacuum, if it holds vacuum pressure, then valve is o. k, RLA(LRA) lock rotor amps, is amount of amps compressor used to start, but will drop once compressor is running, 11.6 when operating is o/k, does your evap. compatible with condensing unit?, is it right size. check also that you're using right type of freon, check condensing unit & evap labels for right type of freon, make sure they can handle same type of freon. but check compressor valve carefully, i think your comperssor could be loosing it efficiency, compressor could be your problem. good luck.good luck

Aug 07, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Sanyo Condensing unit. blower fan doesnt come on unless unit runs,but unit only runs for about one minute and shuts off. led #6on cond. unit blinks and led on evap. coil #26 also blinks unit needs to be...


First, the condensor fan is only supposed to run when the unit is on. As for the one minute run, then needing reset...this sounds like a "safety out". The air conditioner knows something is wrong and tries to protect itself. Being low on Freon would take about one minute to register. Do you have pressure gauges? The low pressure side should be about 65 to 85 psi with Freon 22.

Jul 24, 2008 | Sanyo Air Conditioners

1 Answer

2 ton sanyo suction pressure erratic


Your suction pressure is erratic, your max. pressure is to much high. You did not measure your unit current reading liquid line press. to complete the data. But the problem of your unit is not the compressor its the system. Try to reprocess the system flush the unit with nitrogen, isolate the capillary tube and flush it with nitrogen to insure that no restriction.

Jan 04, 2008 | Sanyo 24KS62R Cool Mini Split Air...

4 Answers

After running awhile ac blows warm and theres no water in evap tray.


Hi, Sounds like you have a leak in the lines somewhere and it is low on refrigerant (Freon). If the evaporator spends very much time below 32deg it will freeze up and you will feel very little air coming from the vents. The evaporator will have ice covering at least part of it depending on how much refrigerant is has in it. No refrigerant, there will be no ice or water. If the unit is properly charged, the larger of the two refrigerant lines at the condensing unit will sweat all the way back to the compressor but the compressor should be fairly dry. Restricted air flow will also cause one to freeze so check your air filter. If the ac tech thinks that the evap temp was ok at 22 deg, find another ac tech. 22 deg evap means its either too low on Freon, refrigerant filter drier is stopped up, a blockage in the refrigerant lines, too little air flow across evap coil or it could be that the evap and cond are sized wrong. The evap temp has to be above 32 deg. If it has Freon in it, you can use soap bubbles to check for leaks at the solder joints. Turn the unit off first for pressures to equalize. Let me know. kstfas

Oct 22, 2006 | GE AJCQ08ACB Air Conditioner

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