Plumbing and heating expert Richard Trethewey shows how to prevent ice buildup from shutting down an air-conditioning system. (See below for steps.)
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Richard troubleshoots an air conditioning coil that freezes up with use. Richard replaced a 4-ton air conditioner with a more appropriately sized 3-ton air conditioner.
Steps for How to Repair a Frozen Air Conditioner:
1. Clean or replace the return-air filter to ensure it’s not obstructing the flow of fresh air to the air conditioner.
2. Confirm that the size of the air-conditioning unit can accommodate the diameter and number of cool-air ducts.
3. Remove the metal access panel to expose the evaporator coil.
4. Check the size of the outdoor condenser unit. Typically one ton of cooling is needed for every 500 to 600 square feet of living space.
5. If the condenser is too big for the house, it can cause ice to form on the evaporator coils and shut down the system.
6. Pump out and collect the refrigerant from the existing too-large condenser.
7. Disconnect the old condenser and cart it away.
8. Install a new appropriate-size condenser.
9. Connect the new condenser to the existing electrical power supply and refrigerant lines.
10. Remove the old evaporator coil and replace it with a new coil that matches the tonnage rating of the new condenser.
11. Reconnect the ductwork and seal the new evaporator cabinet at top and bottom with sheet metal strips and foil tape.
12. Braze new copper connections to the refrigerant lines.
13. Insulate the suction line.
14. Connect PVC pipe to the condensate drain and then attach the pipe to a pump.
15. Run flexible tubing from the pump to a drain.
16. If necessary, add refrigerant to the new system.
17. Turn on the air conditioner to ensure it’s operating properly.
Expert assistance on this project was provided by Papalia Plumbing [https://papaliaplumbing.com/] and Air Purchases [https://www.airpurchases.com/].
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How to Repair a Frozen Air Conditioner | Ask This Old House
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View Comments
Tired of these diy videos
Pro tip. Don't hire a hack to install your ac. This job goes on the worst install list. Is that how you east coasters do your jobs? What happened to craftsmanship? Who would think by looking at that trash pile that it was a good job. Not much better after the new installation.
Indoor coil doesn't have to be the same as the outdoor unit. You could of done a 3 ton outdoor unit with a 4 ton indoor coil for better efficiency.
My A/C froze so I took it to the Equator. That did the trick. We also had bananas and monkey meat while enjoying the tropical heat & humidity.
Recovery machine is not like a giant vacuum more like a transfer pump
This cant be the only way to fix the freezing issue, is it?
Is this reason why my 21 year old York central ac keeps running constatnly?
Really this guy doesn'nt know his suction line from his liquid line. Follow him starting at marker 2:20.
Geeze!
Think about he has a 10 return on a 4 ton unit. a little restriction right there. Hey maybe that will cause it to ice up.
You can never oversize a return air but you can undersize one.