|Posted by AC Contractor on September 4, 2014 at 9:40 PM|
Over the course of the past couple months we have been updating homeowners on the widespread TXV failures that have been happening in the HVAC industry. It appears that manufacturers have determined the cause and solution to the problem. Below is an excerpt from a service bulletin from Rheem.
Details: Rheem has identified potential root causes of the field reports where the TEV fails to maintain design superheat.
To recap prior bulletins, as previously reported analysis shows the TEV is not the root cause of this issue. We believe the source of the problem is a chemical substance originating from the compressor.
We have been working with Emerson Climate Technologies to revert back to manufacturing processes in place prior to when the TEV sticking issue started to appear. All residential condensing and package units will be manufactured with compressors utilizing these earlier manufacturing processes no later than September 10th, 2014.
Rheem has aggressively tested system additives to resolve the superheat drift issue.Early tests and field reports have shown favorable results with the Nu-Calgon’s AC Re~New additive (Rheem Part number 4057-55). In known superheat drift situations, Rheem suggests the use of this additive will be an effective alternative to replacing the TEV. Note, our testing shows no benefit in using activated charcoal type filter driers with this additive. No harmful system effects have been observed with this additive, and Rheem continues to work with component manufacturers to assure long term reliability.
At this time, Rheem will support the use of the Nu-Calgon’s AC Re~New additive in systems with outdoor unit serial numbers in the date code range of 4013 to 3714 that exhibit superheat drift without voiding the factory warranty. An allowance is available for the addition of AC Re~New additive to systems that exhibit this phenomenon.
To utilize this program an iWarranty claim may be entered for part number 4057-55 (AC Re~New) with a $100 labor allowance filed using an indoor unit or packaged unit model and serial number. The outdoor unit model and serial number must be listed in the notes section of the claim. Please reference WCN approval code 2402014 on the claim. This allowance is only allowed on installed units when processed with the AC Re-New claim and is not retroactive. This allowance and program is effective from September 2nd 2014 and will terminate on August 31st 2015. Should replacement of the TEV become necessary due to superheat drift it is covered under our standard labor allowance guidelines. Please continue to use WCN approval code 2112014 for TEV Replacements. Recommended or Required Action: Please report unusual cases to your assigned DTR; include model and serial numbers for both indoor and outdoor units to help identify complete systems.
Thank you for your continued support of Rheem/Ruud products.
In addition to the service bulletin from Rheem, we also received this announcement from Gemaire which is a distributor of their product.
Rheem will provide the approved Nu-Calgon additive and a $100 labor allowance for the affected units in the serial number ranges from 4013 to 3714. This allowance and program is effective from September 2, 2014 and will terminate on August 31, 2015. The allowance and program does not include any tools and is not retroactive. Although we do not stock a significant amount of the Nu-Calgon additive, we are diligently working with Rheem to obtain an adequate supply, which will be available to you as soon as possible.
So while there may still be some delays due to inventory on the Nu-Calgon additive it appears the solutions are on the way. This video shows how the Nu-Calgon additive works with your air conditioner. If you have any questions about the TXV on your air conditioner or heat pump as to whether or not you will need this additive don't hesitate to contact Melo Air today.