It’s important to allow a few moments for this review.  This will prevent costly and aggravating mistakes from happening during the installation.  Communication is a key component to a successful installation.


Removing the Existing Indoor Evaporator Coil

The indoor evaporator coil is the other half of your air-conditioning system that sits above the furnace, though in some cases it will sit below the furnace.  This is what the other end of the refrigerant lines are connected to.

The indoor evaporator coil has two variations.  One is cased and the other is uncased.  In either application, the sheet metal plenum must be disconnected before the new coil can be installed.  This process can be complicated when access to the coil is restricted.

The most common restrictions are rooms built around the system such as closets or finished basements.  This prevents access to all sides of the coil or plenum.  An additional charge may be added to the cost of the job based on difficulty.  Because most indoor coils are more efficient, they are taller.  Additional prep work for the supply plenum may be required before the new coil can be installed.


Removing the Existing Copper Refrigerant Lines (Line Set)

Next, the existing refrigerant line set can be removed.  This is a set of two copper lines through which the refrigerant travels from the outdoor condenser, then back into the indoor evaporator coil.

Refrigerant travels through the lines along with oil.  In older air conditioning systems, the oil in the existing line set is different from the oil found in the new air conditioner.  These oils cannot be mixed without damaging the new air conditioning system.

Sometimes the line set is concealed by a ceiling or in a wall, or it is buried underground or in concrete.  Sometimes providing access is not an option or possible.  In these cases, you have the option of finding a new location to run a new line set or reusing the existing line set remains.  If the existing line set must be reused, it must be flushed and cleaned properly, then pressure tested.  It is never recommended to keep an existing line set if it can be replaced.


Installation of the New Indoor Evaporator Coil

There are two options when installing a new evaporator coil for any new air conditioner system: cased and uncased.  The preferred option is a cased coil, because it comes in an insulated cabinet with removable panels on the front that allow access to the coil inside.

The cased coil is also designed to sit on top of the furnace without any modifications, which makes repairs and modifications easy.  In most cases, it will be painted to match the color of the furnace.  The biggest benefit of using a cased coil is that it comes pre-cased by the manufacturer.  This makes failure from an improper installation highly unlikely, regardless of the skill level of the installer.


Contact Us

If you do experience any emergency issues with your A/C system, you can always give us a call.  If you have an upcoming HVAC project, join hands with a licensed and insured contractor at East Coast Mechanical.   Email: ecmcecmc@aol.com  Address: 5133 W Hurley Pond Rd Suite A, Wall Township, NJ 07727 Hours: Monday to Friday 8 AM to 5 PM and Closed Saturday and Sunday.

Phone:  800-300-ECMC or 732-751-8877

Central Air Conditioning Installation