I disagree that [an expansion valve] “must be present in every refrigeration system no matter what size or shape ???”
Some automobile systems do not us a TXV—it has been replaced with an “orifice tube”. There are still some split-system manufacturers that are using capillary tubes in place of the TXV. However, the TXV, when properly adjusted is superior to the other types.
The fact that some still are not using TXVs (although, more and more infrequently) indicates that that the phrase “must be present in **every **referigeration…” is incorrect. That’s what made it difficult for me to determine what you were seeking.
But, it was still a fun exersize for everyone, wasn’t it?
I stayed out of this question, per your inference in your opening challenge to the group.
Your question was fun and accurate along with your answer/explanation of the four catagories with examples.
Dryers are usually used only after the system has been contaminated internally.
That’s usually the first thing I look for, to get some kind of idea of the condition of the system.
Age of the system is always an indicator, but maintenance and repairs are as or more important when it comes to what I’m going to tell my Client.
I had a system on Saturday that was a prime example of a lack of maintenance.
Works for me. Robert J. You very nicely described the functions of the four basic refrigeration items that started this thread. I asked for the items not their function. You have removed next week ends question which was going to be to list the four items functions. Your punishment is going to be Please list the next question.
Jae
Expansion valve was named as the fourth item yes it is one of the metering devices so I excepted it as correct. Just as there are numerous types of compressors. numerous types of condensers numerous types of evaporators.
I was also thinking that the typical residential cooling systems that HI’s come across have both the compressor and condenser coil in the “condenser” unit.
JMO
P.S. There were some pretty good AC system diagrams in the older version of the NACHI Tip Of The Day … I will see if I can dig those up as sometimes a picture is worth a thousand words, and the idea of using warm outside air to “cool” a house is sometimes difficult to catch.
Found it … here is the AC system diagram I saved from the old NACHI TOD. Describes/diagrams the typical residential cooling system pretty well in my opinion.
On secong thought, perhaps one change, and describe that component as a “Condensing Coil” as in the TOD diagram to avoid confusion.
Then you have a Compressor and Condensing Coil (part of the typical residential “condenser” unit) in addition to the Expansion Device and Evaporator Coil (typically found at the indoor air handler).
About how long of a main supply plenum coming off the air handler should there typically be before any individual supply take-offs are cut in?
And possibly another one:
Should there be any supply take offs in the end head of a main supply trunk line (plenum head)? … that one is a bit more “sticky” (pun intended for those in the business … lol) …
