This is NOT a bi-directional valve.
Rather than ditch the valve you can install a check valve in parallel with the TEV....piped to all reverse flow.
I have a 12 ton R22 heatpump that has the above mentioned TXV installed. Unit works great in cooling but does not operate correctly in heat mode. Based on what I can find so far I believe this is an improper valve for a heatpump application. I searched here and Sporlan but could not find a definitive answer. I belive this to be an AC only valve and not a bi-directional as required on a heatpump. Can some one confirm this for me? Thanks
This is NOT a bi-directional valve.
Rather than ditch the valve you can install a check valve in parallel with the TEV....piped to all reverse flow.
Are you talking about the Reversing Valve?
How did the system run with that configurstion?.. head pressure spike and trip hps? or bypassing on internal relief? Just curious, never run into this yet. In heating obviously
Thanks to all for confirming what I thought. I believe I will just replace the valve with the proper bi-directional. I have never installed a check valve as mentioned so I am not exactly sure where it would be located. Just not exactly sure of the piping configuration. I would like a little more info on that for the future though.
As far as operation. In heat when it would start it will pull into a vaccum at first then suction and head pressures will even out to around 100psi. Switch to cooling and the the unit operates just fine
Thanks to all for confirming what I thought. I believe I will just replace the valve with the proper bi-directional. I have never installed a check valve as mentioned so I am not exactly sure where it would be located. Just not exactly sure of the piping configuration. I would like a little more info on that for the future though.
As far as operation. In heat when it would start it will pull into a vaccum at first then suction and head pressures will even out to around 100psi. Switch to cooling and the the unit operates just fine
Really?
A check valve is a few bucks and easier to do then a TXV
normal flow would be from right to left in the cooling mode which uses the txv.
in heat the flow would be left to right and bypass the txv
Nice diagram... even got the process tube on the bulb ;-) direction of flow arrows would be nice tho... j/k
thank you. haha.
haha...good ol' microsoft paint
If you choose to install the check valve, you'll need to add the auxiliary side connector to the refrigerant distributor. The reverse flow during the heating mode has to not only bypass the TEV but also the refrigerant distributor nozzle. The orifice in the nozzle is too small to allow the full mass flow of the system through it without an excessive amount of pressure drop.
The auxiliary side connector is essentially a tee, that allows you to move the nozzle from the distributor body to the ASC body, which then allows the refrigerant in reverse flow to enter between the nozzle and the distrbutor body, bypassing the nozzle.
Regarding sizing of the check valve....if it's a 5 ton system, you'll need a check valve capable of 5 tons of mass flow with a minimal pressure drop for the refrigerant in the system.