Question about Intertherm P3RA-048K Air Conditioner

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Im not getting enough cold air in my house to keep it cool during the day my air runs 24/7 but it remains hot the only time it cools down is at night

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Hi, I will give you some things you can do as far as some service on this unit. What happens, is when the ambient temperature rises, so does the internal freon pressures in the system which in turn, causes the unit to work much harder and at a 95f degree ambient temperature, most all residential units loose up to 45 to 50% of there efficiency!! This is a fact. Then you walk into a shopping center and its over 100 plus outside and a nice 72degrees inside, so you start wondering why my unit is not that cool. Well, being a A/C, Heating, & Refrigeration Contractor for 33 years, I know what goes on. Most all home units as I say are made to work good up to about 95 degrees ambient. This is for a 2 to 5 ton unit. 1 ton of cooling is 12,000 btu's, while on the roof of these shopping centers and strip malls they have 15, 25, 75, and even higher tonnage units!! So back to yours, I just wanted you to learn a little about the size and tonnage of a unit. You can do this first. It's showing you have a complete package unit, all in one not a split. I don't know when the last time you had it serviced but, take your garden hose, kill the power to the unit first. Go to the unit and the wrap around coil give it a good washing out. They make a coil cleaner but you have to be a contractor to buy it. Water will be fine. This should be done once a year in the Spring. Careful not to bend the aluminum fins flat on this coil, but do clean it very well. Dirt is drawn in by the condenser fan motor on top. Start washing from the fan area out first, and go around the outside and wash in. Do this until you see no more dirt, as this is very important. This keeps the high head pressures down to normal in your system, and if its dirty you can lower this high side pressure up to 100 p.s.i. The unit is made for outdoors, so don't worry about getting it wet. Try not to spray water on the main electrical box of course. Keep your filter cleaned or changed as this is also very important. Here is a rule of thumb I will tell you about air conditioning temperature you will know. If you can, pick you up a dial or digital type pocket thermometer at a hardware store, and take these readings at the supply air vents,1 or 2 of them and record it, and at the return air which is where the air returns back through your air filter. This is called your temperature split, or TD (temperature difference). If your unit is running properly as far as freon charge and so on, it should be between 18f to 25f degree difference!! Any higher or lower indicates a problem, low on freon, compressor valves are weak, plugged evaporator coil or dirty filter, many things, dirty condenser coil. Check this before you wash out your coil and let it run and dry out first, and recheck to see what you have. Your unit runs 24/7 trying to capture the load and can't keep up. May be do to age, or just needs some TLCare. So again, the TD check, lets say your supply air coming in is 58*F. Your return should be close to 76*F to 83*f, a 18 to 25*F degree difference. 18*F to 20*F would be awesome, but this is the rule of thumb we use. If it's 105* outside, you will be lucky to have a indoor temperature of 80*F!! A 25* difference. If after recording all of your temperatures and noting them, cleaning the condenser coil and making sure the filter is clean, after the unit runs for 1/2 an hour, recheck the sa&r/a and see what you have. If the coil was very dirty, this may have solved your problem. If after all of this, you may need to have your freon level checked, lets hope not. I have a feeling that it is in need of a good service. Please keep me posted on this, and I am sorry for such a long answer, but I just wanted to share some things with you to remember. Please get back to me to let me know the out come and please rate me kindly as I know you will.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Posted on Jul 29, 2010

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First thing to try is cleaning everything. Use a garden hose and spray out the coils on the outside unit. Make sure there is not anything blocking the air. next clean the evaporator coils and filter. After cleaning watch the inside a coil with unit running. Does it have condensate all the way to the top? If not you may need to adjust the refrigerant.

Posted on Jul 29, 2010

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