404A elementt on a 22 coil

[Magoo83]

Was working on a freezer the other day and repaired a leak on a tx valve, r 22 rack. noticed that someone was playing with valve and it was flooding back to rack so i adjusted to 10F superheat at coil.

someone then pointed out afterwards the element on the valve was for 404 system. seeing as I had the valve adjusted to proper superheat does it really matter that it is the wrong element? all the tx valve does is control flow into evaporator so if i had flow right then why does it matter?

[coolperfect]

I can't wait for the replys on this one,as for me I am in enough trouble!

[craig1]

The valve will work fine........ at the exact conditions (evap temp, suction pressure) you set it at. Any other conditions, the opperation will not be correct.

[Phase Loss]

I would worrie about flooding in low load conditions. The R404 element will have a greater opening force than a R22 element.

[jpsmith1cm]

I would worrie about flooding in low load conditions. The R404 element will have a greater opening force than a R22 element.

Also, if the valve is designed for 404a, it will tend to have a larger orifice.

I've seen one or two small 404a valves flood out an r-22 rack in a half hour.

[VTP99]

Now who went and put a R404a power element on a R22 system ?

[jpsmith1cm]

Now who went and put a R404a power element on a R22 system ?

Maybe someone put 22 in a 404a system...

[coolperfect]

Maybe someone forgot to put in the valve ,started it up and running for weeks! I had an SC on It! The readings were wacko!

[Magoo83]

lol no it is a low temp r22 rack. freezer has had that head on tx valve for a long time i think. freezer has been running a little warm. other guy that looked at it thinks its the head on the tx. i dont really agree. if the coil is being feed properly then that is important part. i think the problem is the ****ty old rack. have 5 compressors on the rack all running, setpoint is 10psig on controller and its running 12-15psig. never reaches 10.

[jpsmith1cm]

its running 12-15psig. never reaches 10.

Well, THERE'S your problem.

Find out WHY! Fix it.

You'll be the hero (after they're done b***hing about the bill)

[jpsmith1cm]

i think the problem is the ****ty old rack.

Thinking like that will never resolve the problem.

Yes, it may be old. Yes, it may have been poorly maintained and sub-standard repairs have been done to it, but there it sits and it needs to run.

Your job, however, isn't to condemn the last guy (or guys) or the last company or companies that serviced it.

Your job is to find the ROOT of the problem. Repair it and move on.

[ararams]

I would say if any unit is served a healthy dose of correct parts topped with proper adjustment will live to be an age old unit.

[Phase Loss]

Remember, no matter how old that Rack is. That it used to make set point.

Some thing has happened, and it's almost never because it's old