Question about Heating & Cooling
I would not get too excite4d about this yet...if you are 10 degrees cooler then the outside you are definetly cooling and the mass of the house is also warm because you have just started the unit...give it at least a day...more important is whether you are dropping the air temperaqture as it goes through the unit...it should be dropping at least 20 degrees. so if your house is 75 the air coming out of the vents should be 55.. if that is happening then you are cooling to the capacity of the unit.. if not then get them to come back and fine tune the charge...
36 Amps on a 3 ton unit is a bit high, but that can be affected by voltage and other factors...it is not high enough to be concerned about...
Posted on Aug 14, 2010
Sounds like it might have been a dirty coil and possible dirty filter in the first place.Air flow restriction will cause the indoor coil temp. to drop and cause excessive sweating. A superheat or sub-cooling measurement should be made before any freon is added. An over-charge is bad for your A/C and wallet
If the unit is working properly it should cool the home. Is your filter clean? Look and the evaporator in the inside unit. Is it frosted up? Do you have condensation water in the pan? Go to the outside unit and feel the air coming out of the fan. Is it warm? Now feel the 2 copper pipes coming out of the unit. Is the small one warm or hot? Is the larger one cool ? Is there moisture on it? Post back with results. Many apt. maintenence folks really don't know a lot about A/C.
Please post your feedback and Vote if the problem resolved as per your satisfaction.
Posted on Aug 13, 2010
Flip the switch on the thermostat for the fan setting to FAN ON, not AUTO. This will run the indoor fan nonstop. The outside A/C unit will still cycle with a call for cooling from the thermostat. The constant air moving will keep you cooler. You can probably keep the thermostat a degree or two higher than normal and still feel comfortable. You will also maintain a more even temperature between upstairs and downstairs. This will SAVE you MONEY because the outdoor condenser will not come on as much!
(3) Make sure that you wash the outside condenser coil once a year. If it's dirty, the A/C will run hot and inefficient. A sign of the coil being dirty is the small exposed copper (pipe) (tubing) line, usually 3/8" O/D connecting the inside unit with the outside unit will be HOT to the touch.
(4) If the small exposed 3/8" copper pipe connecting the inside unit with the outside unit is hot to the touch there can be several reasons why;
(a) A/C is low on refrigerant.
(b) The outdoor condenser coil is dirty. Those are the two most common reasons for it to be hot to the touch.
(5) "Warm Rooms" on the lower levels of the house where it is cooler cut back or cut off some vent registers (Diffuser) and make sure that all the ones on the upper floors where it is warmer are open all the way! Also, see paragraphs #2 & #9.
(6) "Doors" if you close the door to a room make sure that there is about a 3/4" gap between the bottom of the door and the floor. You may have had carpet put down on the floor and now there is no gap. This is necessary if you have a central return air duct in the hallway. The return air ducts need to pull the warm air from the room.
(7) Never leave the house and turn OFF the A/C. then come back home and turn it on and expect it to cool the house anytime soon. Doing this will not allow the unit to cool down the house for several hours. You can set the temperature up five to ten degrees but NOT OFF. This is because of Latent heat buildup in the walls and furniture in the house and will make the A/C work harder to remove the heat, this takes a long time.
(8) Never turn the A/C off than back on in less than five minutes, this will short-cycle the compressor and can trip breakers, blow fuses, or cause permanent damage the compressor. You should have a time-delay install on the A/C to prevent this during power outages! Some setback thermostats have a time-delay built-in. Having a start capacitor and relay is a good idea. This will increase the life expectancy of the compressor by starting faster thus keeping motor temperature down, using less electric to start.
(9) Keep blinds closed, curtains drawn, window shades drawn, a working attic fan would be a good idea, plenty of insulation in the ceiling & walls, air tight storm windows, keep outside doors and openings close, etc.
(10) "Icing of the indoor coil or the large insulated covered copper pipe "There are two main reasons for this, lack of air flow or low on refrigerant. Lack of air flow can be a dirty air filter, dirty indoor evaporator coil, dirty fan blades, damper in duct restricting air flow.
There should be a 15-20 degree temperature drop across the indoor coil at the air handler. Check the temperature drop in the duct close to the coil, if air coming into the coil is 75 degrees than the air leaving the coil should be 60-55 degrees. If it is higher or lower there is probably something wrong. Too high of a drop, IE more than 20 degrees drop, could mean lack of air flow or low on refrigerant. Less than a 15-degree drop could mean too much air flow, dirty outside coil or low on refrigerant.
Do NOT build a deck close to the top of the outside A/C or anything else that could cause the warm discharge air to re-circulate back to the unit. Fuses, Circuit Breakers or wires should never be hot to the touch; if they are hot you may have a sizing problem or a loose or bad electrical connection.
Call 1-800-533-7694 for more information about the PHCC.
Air-Conditioners DO NOT add cool air. What they do is remove warm air and put it outside. R-22 & R-12 ETC.. Refrigerant is a manmade product invented by DuPont and given the trade name FREON.
The temperature of refrigerant is directly relate to the pressure it is at and vise versa, IE.R-22 at 0 psi is -40 degrees below zero or at 60 psi it at 32 degrees. This is misleading; the temperature change is NOT related to pressure really, but almost totally tied to the change from a liquid to a gas. When liquid Freon is expanded to a gas it gets really cold (latent heat of evaporation) and when the warm gas is compressed to a liquid it get hot. The temperature change in say compressing liquid Freon to a higher pressure (adiabatic compression) is small. You see the same effect when you crack the valve on a CO2 (or propane) bottle for example. You will get a smaller effect with a pure gas, like when you fill a Scuba tank, (gets warm) or drain it quickly (valve gets cold right at the expansion point, but this effect is not great enough to run an AC system.
The physics of phase change from a gas to a liquid and vice versa drive most weather for example as well.... With water it takes as (I recall) 560 (or was it 590...) times as much energy to boil water from 100 C liquid to 100C gas as it does to raise the same amount of water 1C in temperature. Freon is less dramatic than water in terms of this energy amount, but it boils at a much more convenient temperature for human AC units than does water. If you wanted the inside of your house to be 100C you might want to run water in your AC.
Over sized A/C will run short cycles and not remove the humidity and moisture from the house, an under sized unit will not be able to keep the house cool on a hot day. You MUST be careful to get the correct size A/C for your house. A/C's are sized by tons; there are 12,000 BTU'S to a ton of cooling. ("Ton" means 12,000 BTU'S of heat is needed to melt one 1 ton (2,000 Pounds of ice) You need to move 400 CFM of air per ton of cooling across the indoor coil. 450 CFM for Heat Pumps. Each CFM (Cubic foot per minute) of air will carry 26.7 BTU's of cooling. You need a heat-gain calculation done per room to get the proper (CFM/BTUs) to be delivered to each room and the total (Tons/BTUs) needed to cool the house based on designed weather conditions in your area.
Posted on Aug 09, 2010
No problem with the amps, your unit draws less than 32 amps.
Your problem is the fact that the power of the unit is a bit small compared to the size of your house, especially if you have an badly insulated house with single pane windows. Either get a bigger unit or start insulating your house - start with the windows and doors.
Posted on Aug 09, 2010
The problem with your cooling system is more likely to be from the amps that were not changed. Air conditioners just like refrigerators work based on the current which is supplied to them. If the current is not enough they tend to cool improperly and drop temperatures.
Get the installer to change the amps in the circuit breaker to 45 and observe how the unit functions. If it does not function properly then the unit is faulty but this is a long shot. The problem is most definitely from your amps.
Hope this solution has been helpful?
Posted on Aug 08, 2010
If the circuit breaker was not of adequate rating then it would trip. If this not happening then the 36 amp rating is adequate. In order to find out if the unit is sized and installed correctly you will have to find out if the compressor is running continuosly or is it turning on and off now and then. If the compressor is turning on and off and the set temperature is not reaching, then thermostat is not ok. But if the compressor is running continuously and the set temperature is not reaching, then the compressor may be leaky.
Also check if the fan is set on high speed and not in economy. Please provide the actual model no. of your Trane system.
Posted on Aug 08, 2010
If cooling is not there then you'll need to check the thermostat, it may be off or set incorrectly. Reset thermostat to a desired temperature and check. It may have happened that the indoor unit is running but outdoor is not. If the outdoor unit is not running then the Air coming through your vent will be warm. Try turning off your thermostat for 1–3 hours to see if it will reset. Also, inspect the circuit breaker and fuses. If the breaker is tripped and/or a fuse is blown, check the unit for grounds or shorts. Check the control and power circuits for shorts or grounds.
Hope this helps... If it does please do not forget to accept the solution or post back for assistance.
Posted on Aug 07, 2010
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Posted on Jan 02, 2017
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