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Hello. I have a Bryant 561CJ030-D AC unit. The fan comes on but doesn't seem to be cooling. We have had record high temps the past couple of weeks (over 100 degrees), and I'm wondering if the unit could simply be overworked. What if I completely shut it down for a few hours...? Your thoughts would be much appreciated.
Re: Hello. I have a Bryant 561CJ030-D AC unit. The fan...
Is the compressor turning on? The fan may be running, but you will not get cooling effect unless the compressor is circulating refrigerant. It appears your unit is a 2.5 ton unit. What is the square footage of the space being cooled? Is the space insulated?
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With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.
If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.
If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,
Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.
Please reply with Model number of bottom of AC unit ( upper) . Can be seen from inside usually. Thermostat model, plus if controls are at the ceiling assy or at thermostat on wall.
HIGH PRESSURE CUTOFF SWITCH LOCATED ON AC COMPRESSOR DISCHARGE LINE LEADING TO THE CONDENSOR.THE HIGH PRESSURE CUTOFF SWITCH WILL CUT OFF THE AC COMPRESSOR IF SYSTEM PRESSURE RISES TO HIGH CAUSED BY RESTRICTION IN THE REFRIGERANT CIRCUIT OR OVERHEATED CONDENSOR.MAKE SURE COOLING FAN IS RUNNING WHEN THE AC SWITCH IS ON.THE COOLING FAN KEEP CONDENSOR COOL, IF COOLING FAN DONT RUN.YOUR AC WILL STOP BLOWING COLD AIR.HAVE THE REFRIGERANT SYSTEM CHECK OUT.MAKE SURE YOUR LOW SIDE PRESSURE IS 10 - 37 PSI. THE HIGH SIDE PRESSURE SHOULD BE 112 - 210 PSI. CHECK THE AC COMPRESSOR CLUTCH FUSE AND RELAY.
Hello, if the high side pressure iS 100 and low side 30, then the unit is undercharged. Im assuming this is a R-22 unit. Typically your low side should be between 65-70 psig and high side should be between 220-230 under normal conditions.
Hi if the indoor fan continues to run after the unit is done cooling, you either have a fan relay located in the indoor unit that is bad or stuck, or a problem in the thermostat with the fan contacts not opening when its satisfied. Pull the cover from the thermostat to expose the wiring. Find the G/Green wire. This is the fan wire. Take a small screw driver and carefully loosen screw and take this wire off. Give it a couple of minutes to see if it shuts off. If it does shut off, the thermostat is faulty and you will need a new one. If it still runs, you will have to check the indoor unit and find the fan relay. If this system is gas fired for heat, it will have a combination fan/High limit control that is the problem, more then likely stuck. Look at the wiring diagram on the panel and it will show you the fan control. You can try tapping on it to see if you can un- stick it. If not, it will need to be replaced. If its just a fan relay, it will be black about the size of a wooded match box with around 5 wire terminals on it. If you have someone turn the stat on and you should be able to hear it click. Do the checks with the stat and let me no the out come and we can go from there. Shastalaker7
Your AC cooling efficiency is low when he ambient temperature is high and naturally it cools well when the outside temperature drops. Please remove the filter on the grill and try to clean it under the tap water and after removing all the dust fix it back to the unit. This would increase the cooling efficiency of the unit. Your AC is also five years old. Please avoid frequent opening of doors or windows. Ensure that the exhaust fan and the blower of your unit are functioning normal. The technician might not have done a proper job in fixing the area where the refrigerant would have leaked out. Please check the refrigerant pressure to ensure that no further refrigerant leak has taken place. Or even servicing your unit he would have punchered the tubes resulting in very slow leak of refrigerant resulting in no cooling or less cooling. It takes around a month to feel the pinch of it and the refrigerant. One fine morning after sometime the unit will run and it would start throwing hot air instead of cool breeze!
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