Recharging a window air conditioner is not something many do with most buying a new unit.
They can however be recharged with refrigerant and be put back to work cooling a room or space.
Recharging a unit is not difficult but if you have never worked with HVAC refrigerant be sure to study the basics.
This post is only to show the basics of getting a window A/C unit back to work after it has lost refrigerant.
1… Find and Fix Any Leak
The first step is to check for leaks. If a unit has a very slow leak over the course of a year or more it will only need a boost.
A fast leak will need to be fixed and repaired before refilling it.
There are a few methods for finding a leak from a visual inspection to filling a unit with Nitrogen and using soap to find the leak.
Leak detectors can also be bought which sniff out a refrigerant leak and will make a fast audible beep as it moves closer to it.
Read Here For More information on Refrigerant Leak Detectors.
Soldering a bad joint or any place the leak is the the most common method for leak repair.
2… Install a Service Port
Small air conditioner units will not usually have a service port to hook up gauges.
Installing a service port is an easy task and requires soldering in a port or using a piercing valve kit.
A piercing valve is easy to install and the most common method to get a Schrader Valve on a unit.
Service ports are installed on the low pressure line which is the larger diameter line.
Read Here for Instructions on Installing a Service Port on a Window A/C unit.
3… Recharge the Unit
After any leak is fixed and a service port has been installed the unit is ready for refrigerant.
HVAC gauges and the correct refrigerant is needed.
Most units today will use R410a but be sure to read the serve tag to be sure.
R410a can be bought at air conditioning supply stores or even online on Amazon
R410a Refrigerant on Amazon
410A, R410a Refrigerant 25lb Tank, Made in USA, Excellent Heat/Cold Performance, Non-Chlorine and Environmentally Friendly, Best Replacement for R22, Suitable for Air Conditioning/Marine Equipment
Hook up your gauges to the service port and the refrigerant tank.
Be sure to watch your pressures on the gauges along with a temperature pressure chart to know what it should be.
Be sure to know what the PSI should be at before starting. Be sure not to overfill the unit.
The above are the basic steps involved in recharging a window air conditioning unit.
Keep in mind there will always be design differences between manufactures.
Also be sure to always follow safety procedures as you would with any HVAC unit.