Evaporator and line freeze up on new AS central air cond system.
Had a new AS system installed 3 days ago. Cooling has gradually deteriorated to where no air is coming out the registers even with the fan on at the thermostat. Line from evaporator and evap coil is covered with ice. What causes this?
Re: evaporator and line freeze up on new AS central air...
Most likely the unit is low on refrigerant they may have a leak at one of the connections. when they installed the a/c did they change your filter? The system could have moisture in it causing the expansion valve to restrict. Your install should be under warranty. I would call the company that installed it.
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Refrigerant Types in a Central Air Conditioner
There are 2 different types of air conditioning refrigerant currently used in residential cooling systems. R-22, commonly referred to a Freon and R410A, a blend considered to be more environmentally friendly, sometimes called Puron.
R410A (sometimes known as Puron), is the industry's choice to replace R-22 in central air conditioning systems. It is less reactive with the environment while having the same home cooling characteristics of R-22. R410A is not interchangeable with R-22-you choose one or the other and your air cooling equipment is designed to operate with it. When you purchase a R-410A system, a new line set is included with your central air installation as well as a new evaporator coil. Our experience with R-410A has been excellent. New cooling systems have been dependable and efficient, as well as operating quieter! R-410A is the refrigerant of the future!
Less reactive with the environment
Replaces R-22 in the year 2020
Cannot be used with R-22 systems
Quiet and dependable
Freon, R22, heat pump refrigerant
R-22 also known as Freon has been used for decades as the refrigerant in central air conditioning systems. However it has been linked to Ozone depletion and has therefore been banned from being manufactured after the year 2010. It's price will increase as the supply decreases.
The drain pan for the evaporator needs to be checked for cracks & make sure the evaporator is centrally lined up to the pan. Sometimes condensate shield are installed to manage the water blown off the evaporator coil. Generally with the evaporator housing open, check any signs of where water has been traveling ie rust lines or calcium deposit lines to determine were the water is coming from.
It sounds like the air cond is freezing up, and as he melts the ice off he evaporator coil you will have air flow again. When the evaporator, (which is the coil that absorbs the heat from your condo) is frozen over, no air flow can pass through it. The evaporator is located either above the furnace or below the furnace. Therefore, the indoor fan will continue to run, but no cool air will be coming out of the vents. What causes it to freeze up? Usually it is low on refrigerant (some people call it freon). If there is a leak in the system, he may charge it with refrigerant, and then in a few days or weeks later have to thaw it out, and charge it again. If this is the case, you might want to request the leak be located and fixed. Another reason it will freeze up is a dirty filter. Or, if the unit did not have a filter in it for quite some time, the evaporator could possibly be stopped up with dirt resulting in poor air flow all the time and and eventual freeze up of the evaporator. Hope this helps you, stay cool.
Yes. Turn the thermostat off, put the fan switch in FAN or ON and allow it to run for a couple of hours with only the fan running. Check your air filter and your evaporator coil. Ensure they are clean. Clean if necessary. Ensure all of your return and supply air grilles are clean and clear of obstruction.
Restart your system and see if it begins cooling normally without freezeups. If a problem still exists, it is possible you have a refrigerant related issue that will require an EPA certified technician to correct.
The coil freezing can be caused by a couple of things. 1) Not enough air flow over the coil or 2) A low refrigerant charge. First make sure that the indoor fan is running. Then check your air filters and make sure your evaporator coil is clean. After that you can get the refrigerant charge checked. The lower the refrigerant pressure is, the lower it's boiling point is and when it gets below 32F then the evaporator coil and usually the low pressure line freeze up. The leaking you were talking about is probably from the ice melting. Hope this helps.
This is a common problem with any type air conditioner it is caused by to much humidity in the air when the unit is not big enough to Handel the cooling I would suggest getting a bigger unit, adding another unit or a dehumidifier, or setting the unit to a higher temp. then turning it down gradually to let the ice melt and take the humidity out gradually.
It does have air conditioning installed. It may also have rear a/c. The rear a/c evaporator is probably leaking freon. I have replaced many rear evaporators on 2006 and 2007 Chrysler minivans as a result of a design change in 2006. Recharge the a/c and add dye to the system. If it has rear air, look behind the right rear wheel in the fender area under the car where the a/c lines go into the body.