Replydid you braze near that txv ?
if so did you have a soaking wet rag on it ?
Professional Member
Just installed arcoaire 2.5 ton 410a txv system and cant get any superheat?
any advice would be helpful. triple evacuated to 50 microns with dry nitrogen
Professional Member*
did you braze near that txv ?
if so did you have a soaking wet rag on it ?
Professional Member
I used heat sink and never had a problem before, would that cause no superheat?
I thought it would close off the valve if overheated. thanks alot for your time
Regular Guest
Indeed, could have warped the valve body. Double check that the bulb is insulated so it's not picking up ambient air temp.
Professional Member*
indoor blower turning correct direction ?
make sure you have good air flow out the vents , if its not blowing well , check that wheel direction
Professional Member*
indoor blower turning correct direction ?
make sure you have good air flow out the vents , if its not blowing well , check that wheel direction
Professional Member*
What is your "normal" SC?Originally Posted by Brad gall
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
Professional Member
Would overheating the bulb cause no superheat and normal subcooling, also the unit is cooling, however im concerned about the superheat and didnt want to change it out unless necessary , or could it be another problem?
Professional Member
12 degree is what the unit is calling for.
Professional Member*
Overheating the bulb, could cause it to act improper in many different ways, or not act at all.
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
Professional Member
bulb is instulated, Ive never had this problem on a new install and just hoping for any advice. Sure hope i dont have to change it out
Professional Member*
So if you have the 12° SC what is the SH? or do you have the 12° SC?
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
Professional Member*
Well just FYI on the next job, never braze your copper with the bulb attached, your just asking for problems.
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
Professional Member*
you didnt install it backwards didya ...
Professional Member*
I would be concerned to if a new install is running with zero superheat.
Liquid refrigerant is most likely making it back to the compressor. If its not causing damage by way of slugging its washing the oil and eventually you'll experience bearing failure.
Its hard to believe you have any liquid seal with a Txv wide open. If you've confirmed your readings are correct and there is no adjsutment on that TXV then your only option is to replace it.
Professional Member
Thanks alot for all the help.... 12 degree subcooling and 0 on the superheat both measured at the condenser. everything else seems fine and its cooling well, I should have disconnected the bulb rather than relying on the heat sink though. If anyone thinks of anything else to check id rather not have to change out the valve. thanks again
Professional Member
The txv was factory installed and insulated I did use heat sink around the connection, maybe not enough
Professional Member
Thanks SIX I thought overheating the bulb would close off the txv??
Professional Member*
This just don't make sense to me, you would think with only a 12° SC if you were able to get that with a wide open valve, that there would be some flashing, and not have a 0 SH, heck you got me.That coil come with a piston and you forgot to remove it?
__________________________________________________ _______________________
Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law
"It's what you learn after you know it all that counts." ~ John Wooden
"When the teachers become unteachable we're all in trouble" ~ Mr. Bill
"Remember "Pro" is only a name, it's not always a mindset determined to do everything correctly" ~ Mr. Bill
Professional Member
I just checked my notes on the job the unit is requiring 12 degrees of subcooling and i had 10. Could it be slightly overcharged?
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