11 Sep 2014

York-ADP coils txv issue Informational Bulletin 8-4-2014

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York-ADP coils txv issue Informational Bulletin 8-4-2014

ADVANCED DISTRIBUTOR PRODUCTS LLC                                             Drawing of an expansion valve it becomes plugged when debris enters p4
2175 WEST PARK PLACE BLVD.
STONE MOUNTAIN, GA 30087
PH: 770-465-5560 FAX: 770-465-5599
August 4, 2014
Informational Bulletin
Background:
Over the last few weeks, we have received field reports of performance issues with various lower tonnage systems from multiple system manufacturers.
We have been investigating this issue and thought it was important to share what information we have learned with our valued customers.
The performance issue manifests itself through a restricted TXV.
Observations:
Upon investigation, we are finding numerous cases of system contamination occurring in newly installed R-410A systems.
On these systems, a black sticky residue is collecting in the TXV, restricting flow through the TXV and resulting in low suction pressures and poor performance.
Chemical analysis indicates this black residue is formed from contaminants that have been introduced into the system.
We have had reports of this occurring with multiple brands of TXVs and multiple brands of evaporator coils. Therefore we believe the contaminants are coming from elsewhere in the system.
Recommendations:
When replacing a TXV on a contaminated system, we believe filter dryers with activated alumina or charcoal may help prevent the contaminants from continuing to circulate through the system.
These types of filter dryers include:
 Danfoss DCL-163S
 Parker LLD-163S
 Sporlan C-163-S-HH (AC) or HPC-163-S-HH (HP)
We are continuing to investigate and research the source of the contamination and will communicate our findings when they are conclusive.
Sincerely,
Advanced Distributor Products

Here is a link to the original document

York-ADP coils txv issue Informational Bulletin 8-4-2014.pdf

I hope this post helps anyone that’s having problems with bad expansion valves on Puron or r-410a systems. The fix is to clean up the system some how. Maybe install a burn out filter drier just prior to the new valve and also add a burn out drier to the suction line. I spoke to a factory rep who said he recommends changing to an orifice until the problem is cleaned up.

 

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