posted by mr. tony berlin

How TXV's Improve SEER
TXVs that close when the compressor shuts off are referred to as Hard Shut Off (HSO) TXVs.This isolates most of the charge in the outdoor unit when the compressor is off, allowing evaporator pressure to pull down faster on compressor start up.
TXV Problem Solving Basics
I. Underfeeding (Starving)-(Cooling Mode Only) Symptoms: Frost on valve or indoor coil, low pressure indicated at suction service valve, high sup normal liquid pressue. Possible Causes: Overcharged, TXV bulb not attached or improperly attached to suction line, check valve blocked open, blocked external equalizer, TXV stuck open.
III. Overfeeding (Flooding)-(Cooling Mode Only) Symptoms: Low pressure at suction valve, low superheat, high or normal pressure at LL valve. Possible Causes: Blocked return air, dirty RA filter, dirty coil, blower failure.
IV. Hunting (Cooling Mode Only) brief period and trips on compressor O/L. Possible Causes: Check valve stuck closed.
TXVs provide better performance over the entire operating range of the system, protects the compressor from flood back, provides better performance with low/high refrigerant charge conditions. TXVs are also a crucial component in achieving 13 SEER + ratings.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

I don't where you are getting this information but it

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Most are going to a 10% bleed.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

And specifically those with internal equalizing that is why they are made with external and internal. Yes some vale will have positive shut off if they lose Power head (power assembly) and that is only time, that they may shut completely off and I said may! And it does not make difference what gas you may use, operating principal does not change.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Every TXV should be closing down when the refrigeration cycle is over and the compressor shuts off ; the TXV's bulb pressure plus evaporator pressure will be considerably higher than the TXV's spring pressure thereby making the TXV close off . And when the compressor comes back online , the TXV will already be closed aiding in fast pulldown of suction pressure (suction temperature/evaporator temperature ).
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
wrote:

Every TXV should be closing down when the refrigeration cycle is over and the compressor shuts off ; the TXV's bulb pressure plus evaporator pressure will be considerably higher than the TXV's spring pressure thereby making the TXV close off . And when the compressor comes back online , the TXV will already be closed aiding in fast pulldown of suction pressure (suction temperature/evaporator temperature ).
WRONG WRONG only valves with rated MOP will close and taht is ?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Please prove this with supporting evidence. Thanks.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
wrote:

Please prove this with supporting evidence. Thanks.
All you need to do get OEMs catalog on TXVs old catalogs and study MOP ratings And my evidence is over 40 years working with TXVs. where I had to make my own design or alter the design. Tank you!
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Site Timeline

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.