TXV? - http://www.hvacmechanic.com/ Forums
Original message
| NikoTech
 |  "TXV?"
, posted Sat 14 Jun 23:08  
Installed an R22 "All Style" coil with "non bleed" type TXV.This was a new install, split system.Initial suction read 80-90psi. Seemed a bit high? Outside air temp was about 90.I tried removing refrigerant until my suction read 60-70.However, my discharge air went up to 65deg.Hence, I placed refrgnt back in until sp read 85-90psi which dropped my discharge air to 60deg.
Any thoughts greatly appreciated...
Niko
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Replies:
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| Jojo98
| "Re(1):TXV?" , posted Sun 15 Jun 00:13
Pull refrigerant. Weight in charge. Ensure you have proper subcooling, and see what happens.
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| | nikotech
| "Re(2):TXV?" , posted Sun 15 Jun 00:52
When I initially started up the A/C system it was operating with the factory charge which came with the condensing unit. Which is supposed to be enough for the first 25' of line set. At which point the SP was hovering around 80-85 psi? I read the "coil preparation" from the evap coil manufacturer. Which stated that you should renove the TXV sensing bulb should be removed prior to brazing the suction line? whiich is factory strapped and insulated out of the box. Seems stange that they would strap and wrap the sensing bulb with insulation and then ask the tech to remove it???? Who knows could I have damaged the internal TXV parts or sensing bulb by not removing prior to brazing?
Niko
Niko
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| | theduke03
| "Re(3):TXV?" , posted Sun 15 Jun 09:42
That's a lotta info there, except superheat and subcooling. How can you determine a proper charge without that? You can't.
Indoor DB/WB would help too.
"My dad was the most feared furnace fighter in Northern Indiana."
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