You need external.
You can use it temporarily and change it later.
Trenton single fan evap for cooler has the equalizer tube hanging there , but the TXV they sold me is self equalizing ! Can i just ignore that tubing ?
I just unboxed evap and was like nooooooo
I already yanked old evap out !
You need external.
You can use it temporarily and change it later.
Why would you replace it later...just because it belongs there , or will it not work right ?
It won't feed properly, you'll have a low suction pressure. Re-use the old one or like pecmsg said install it temporarily. I would suggest having a sporlan kit on the truck. You can build a valve with it easily and won't run into this problem... Great for service too.
Externally equalized valves are for larger coils that are used in walk ins. What is this coil going into, a reach in or walk in?
6000 btu walkin
If the evap has a EQ line then the pressure drop across the coil is greater then 5#’s and you need a external EQ valve!
Ok old valve with new PH is installed
Old coil was external , so all is well
I took PH off the new incorrect valve , and put onto the old external valve so its half new. :grin:
On a bit of a tangent, if you want to have some fun one day, take your pinch off tool and pinch the external equalizer tube on an externally equalized valve. Watch what happens to the suction pressure.
I do a triple evac with nitro to remove non condensables.
The determining factor on whether the evaporator needs an externally equalized TXV is if it has a distributor or not.
If the coil has a distributor, then there will be roughly a 35 psi pressure drop across the distributor and distributor tubes, which is the reason an externally equalized valve is necessary. Whereas if there's no distributor...ie, a single coil feed and not multiple distributor tubes...then there will be no such pressure drop and so the externally equalized valve is not needed.
I looked at the Trenton TLP low profile coils specs and it states the TLP-104M doesn't have a distributor nozzle and so that model doesn't need the external valve. If you have the TLP-106M, then it does need the externally equalized valve. (See p.29):
http://docs.t-rp.com/1087151.pdf
Good catch. I just assumed it had a distributor. Haven't seen a new WI evap without on in the last 20 years lol.
this walkin has 2 caps coming off distributor , so 2 circuits
It simply means that the coil model TLP-104M doesn't have a distributor to put the nozzle into. This is because the coil only has one circuit being fed, so no need for a distributor.
These coils will usually come with a straight 1/2" OD coil inlet where the distributor normally would be. They used to be 1/2" flare connections until the industry became allergic to mechanical connections.