daveca
24-07-2023, 09:54 PM
Trane XL14C 3 Ton package
Recharge R410A
*CHARGED VAPOUR
*WITH COMPRESSOR OFF
*Repaired broken TXV Thermostat bulb
* Recharged bulb with 410 vapour
*NO SEALED SYSTEM WORK TO FIX THE TXV
Works perfectly:
https://m.youtube.com/watch?v=H8s6NkkvMLg
135 psi low side, +/- a little, depending on entering air conditions.
170 psi R410 on the TXV bulb
hi 80F outdoor
mid 70F indoor
50% RH
nominal about 11.7 amp total package current,
Cycle time at 74F indoor, 950 S.F. two level, with airflow problems, 10 minutes
Interesting to note the main function of the thermostatic assembly is to shut the TXV at compressor off, obviously to preserve the liquid line contents.
The diaphragm pressure at the bulb only affects the low side pressure up to a point.
That is the stated low side pressure by the P&T cycle data from Trane. Increasing bulb presure past the point of stated low side pressure has little or no effect. The system pressures are controlled by indoor and outdoor temp and RH factors, not TXV operation.
This TXV only has a control movement of 0.020 inch, so it appears to be more of an Off- On than a flow regulator.
The info I received from this and other Internet forums was UNIVERSALLY WRONG.
Info from Sporlan Tech was WRONG.
Engineering, thermodynamics and chemistry knowlege told me to ignore it.
I was right.
Recharge R410A
*CHARGED VAPOUR
*WITH COMPRESSOR OFF
*Repaired broken TXV Thermostat bulb
* Recharged bulb with 410 vapour
*NO SEALED SYSTEM WORK TO FIX THE TXV
Works perfectly:
https://m.youtube.com/watch?v=H8s6NkkvMLg
135 psi low side, +/- a little, depending on entering air conditions.
170 psi R410 on the TXV bulb
hi 80F outdoor
mid 70F indoor
50% RH
nominal about 11.7 amp total package current,
Cycle time at 74F indoor, 950 S.F. two level, with airflow problems, 10 minutes
Interesting to note the main function of the thermostatic assembly is to shut the TXV at compressor off, obviously to preserve the liquid line contents.
The diaphragm pressure at the bulb only affects the low side pressure up to a point.
That is the stated low side pressure by the P&T cycle data from Trane. Increasing bulb presure past the point of stated low side pressure has little or no effect. The system pressures are controlled by indoor and outdoor temp and RH factors, not TXV operation.
This TXV only has a control movement of 0.020 inch, so it appears to be more of an Off- On than a flow regulator.
The info I received from this and other Internet forums was UNIVERSALLY WRONG.
Info from Sporlan Tech was WRONG.
Engineering, thermodynamics and chemistry knowlege told me to ignore it.
I was right.