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Heat pump blowing cold air
Today we had a call for a Goodman split heat pump blowing cold air. The customer informed us that the system was no more than three years old. The service call was located out in Loganville GA. We responded to the home in the afternoon, and it was approximately 52 degrees outside. Once we pulled up to the home, we realized that the customer had two separate systems one for us there is and one for downstairs, she explained the downstairs heat pump was blowing cold air and not heating. She said it started about three days ago and directed us to the air handler in the upstairs closet area. We started at the air handler and turned on the system to begin the diagnostics. Once we have the system up and running for about 5 minutes, I realize that the indoor blower was working properly however the outdoor unit failed to heat the indoor coil. I put my ear onto the line-set, and I can hear the refrigerant moving through the tubing although it also had a gurgling sound. This is sometimes an indication of either moisture in the system with the freon or the unit has a low charge and the refrigerant gurgles as it cycles through from inside to outside.
Since the heat pump blowing cold air is the result of either a non-operating condenser or one with Freon loss, we decided to head outside to have a look at the outdoor heat pump condenser. As I approached the condenser, I noticed that the compressor had a weird winding sound like a rattle. It was as if I could hear the valves moving inside the compressor, this is typically an indication of low charge. In speaking with the homeowner, she advised that she had the system turned off since it was blowing cold air and so there was not any frost or ice on the refrigerant line set tubing which is also an indication of low charge.
So, I went ahead and connected the manifold gauges so we can get an idea of what the operating pressures were on the system once removing the Schrader valve locks, we got the gauges connected and realized that the system had extremely low refrigerant pressure.
At this point, we realize that leak detection is going to be needed so we headed out to get the electronic leak detector from the truck. Before we can check the system for leaks, we went ahead and disassembled the condenser removing the fan motor and shroud so that we can access the interior near the compressor and reversing valve.
Once we got the condenser opened and started up the leak detector we began searching inside the unit. After about 5 minutes we were able to pinpoint the leak at the reversing valve and now I have a great idea about how to get this system back up and running.
- At this point however the system has already lost about 85% of its freon charge so we are going to need to go ahead and recover the remaining refrigerant following the proper EPA protocol and then make the repairs.
This customer has a home warranty on her heating and cooling system so we must submit a claim, and have it approved before we can proceed with the repairs. Typically, home warranty companies can approve some repairs immediately but others that are more substantial must go through a review process because oftentimes the cost exceeds their typical thresholds, and the customer may or may not have certain coverages where the repair is included. Oftentimes the customer may have to pay out of pocket for some repairs that are not covered by the home warranty. Our job is to relay the information between the customer and the home warranty, and they decide on how to proceed with the repairs
This is a Goodman heat pump blowing cold air and there is a small copper tube attached to the reversing valve that has rubbed between two pieces of copper and caused the leak. This equalizing tube will have to be brazed for repair.
To do this properly once all the refrigerant has been recovered from the system the copper pieces will have to be cut and prepared for brazing. The areas where they have been damaged will have to be cleaned, sanded, and then brazed so that the brazing rods will be able to flow smoothly and create a leak-free seal. This is going to be a bit challenging due to the location and our ability to reach inside of this condensing unit down near where the actual leak has occurred. This is a labor-intensive process and can be costly to the homeowner. In this case, they have a home warranty which will hopefully offset some of the cost.
Well, we have all the approvals and so we have gone ahead and gotten the refrigerant out of the system and prepared all the pieces for the braze we have the oxygen-acetylene torches all setup and we have already brazed in the fittings and fixed the areas that were leaking. now it is a matter of leak testing the fittings to make sure we do not have any leaks, then we can get this unit recharged.
Since we recovered the freon to make the repairs and the system is empty we are going to go ahead and pull a vacuum to make sure that we do not have any moisture or other non-condensable within the refrigerant tubing the compressor or the coils. We have our vacuum pump and our Micron gauge to ensure that we have a proper vacuum on the system before we go ahead and recharge it.
Now that we have gotten the vacuum done and it is holding, and we are certain that we do not have any leaks we are going to go ahead and recharge the system and we are going to weigh in the freon based on the manufacturer’s data plate.
We have gone ahead and grabbed our refrigerant scale, and we have the 410A freon ready to go. This unit is going to take about ten pounds for the manufacturer’s specs and then based on the length of the line set and the evaporator coil is in the attic, we are going to need another two pounds.
We have now got the system recharged, got it up and running, we have checked all the refrigerant pressures, and the supply temperature is delivering proper heat. This heat pump is back in operation. If you have a problem with your heat pump blowing cold air, call us. As always, for all your HVAC needs call us here at alliance air conditioning company.
When you need AC Repair in Loganville, GA Contact Alliance Air Conditioning by phone: 404-489-2888 or visit us online: www.allianceair247.com to find #AllianceAir247 HVAC solutions. Follow us on Facebook, Twitter, Instagram, and Yelp for news and savings. Check out our excellent reviews on Home Advisor and Google Business.
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