Re: charging a central air conditioner in the cold...
The copper tubing has cracked and water has leaked onto my roof. I have shut off the water valve that runs to the aircodtioner but cannot get someone over until the morning. It is a cold night. Will this be sufficient until I can get someone over in the morning. It's not that cold but there is a possible storm coming thru.
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Pressures look good but to know if it is charged correctly you have to do a sub cool or superheat to know for sure. Rule of thumb is if turn unit it on let it run 10 minutes. If the suction line sweats and is cold. Might be proper charge.
Hello my name is Heath it will be my pleasure to assist you. The first thing to check is the filter in the furnace or air handler. Also check the inside coil to be sure its not frozen up. Does the air coming out feel cold? It sounds like the unit could be low on charge which means it has a leak and should be leak checked repaired and properly charged. You would need refrigeration gauges to put on the system in order to properly check the refrigerant charge in the system. One other thing could be a dirty condenser coil. Turn the power off to the unit and use a garden hose with a strong nozzle and spray water through the whole coil to try and blow any dirt or debris through the condenser coil in the outside unit.
You are being ripped off. The ambient (outdoor) temperature at night is low and therefore proper condensing does not take place causing the refrigerant to pool in the condenser and starving the evaporator. This causes a lower temperature in the evaporator resulting in "freeze up" which is often mistaken for a loss of refrigerant. The proper thing to be done is to block off the condenser air causing the high side pressure to rise until the eqivillant of 110*F condensing temperature. You can also install a low ambient kit which will cycle the compressor off when the temperatures fall
It's probably too late to recommend capturing (bottling) the charge in the condensing unit...... With that said the absolute 100% way to charge any unit is to use the weight method. If you look on the nameplate of the unit it will provide you the amount of refrigerant needed in lbs and ounces, the manufacture instruction manual will give you the additional weight needed for the lenght of the line set. In the event you don't have the ability to weigh the refrigerant accurately you can always wrap the condensing unit with a blanket reduce the condensing capacity of the condenser this will simulate a warmer ambient and allow you to charge the unit. If the unit has a fixed orfice metering device you can use the superheat method, if the unit has a TXV (thermal expansioin valve) you should use the subcooling method. Either of these methods with detailed proceedures can be found on any of the popular search engines. Hope this helps and good luck!
Possible causes are dirty filters, dirty condenser coil, dirty evaporator coil, or low referigerant charge. Any one of the conditions will affect heat transfer.
Check the filters in your indoor unit, If they seem to be clean and replaced on a regular basis, your evaporator coil is probably in good shape. Unfortunatley on some Weather King models even checking the evaporator coil is not possible due to the extensive amount of referigerent lines that block access to the coil without some major work including evacuating the refrigerant.
The most likely cause is a dirty outdoor condenser coil. On weather king models you will have to remove the casing that surrounds the coil because is is built in such a way that the condenser coil cannot be properly cleaned with the casing in place. Once it is removed make sure breaker is switched off and clean the coil with a water hose.
If your outdoor coil is not dirty then it is a refrigerent problem.