EPR on a Heat Pump?

[B1978]

What do you guys think of this? I worked on a unit close by with its own issues. This is on a medium sized commercial building. I didnt even want to look at it, until they ask me to...
EPR, 5 ton 13 seer 208/1 Heat Pump. Coil most likely a 5ton fixed orifice. Messed up line sizes, 5/8 liquid, 1 1/8 suction.. Again gulp, 125' + of lineset, yes I know a txv is required..
Without even looking, or being asked to look at it, I feel it probably has a clogged screen at the orifice, poor piping design, and mix matched coil/condenser seer ratings, plus requires a txv, when a orifice is being used.

I'm basing these conclusions on the unit I worked on nearby. I expect the pictured unit to fail soon, which will get thrown onto one of our guys.

[Six]

Unless they used the EPR to solve a oversizing issue is all I can think of,

I would love to check that out and find out what their rationale was for installing that.

[B1978]

It ran all 8 hours I was there, without stopping! lol

[Shamoke]

Please excuse my ignorance but what is an EPR?

[Six]

Evaporator Pressure Regulator.

Typically they're are used on refrigeration equipment where you would have multiple evaporators and multiple liquid lines with dedicated solenoid valves to cycle each section off and on.

They're supposed to keep an evaporator from going below a predetermined pressure and apparently it was some hacks attempt at solving a chronic icing problem.

worked well didnt it

[Shamoke]

Evaporator Pressure Regulator.

Typically they're are used on refrigeration equipment where you would have multiple evaporators and multiple liquid lines with dedicated solenoid valves to cycle each section off and on.

They're supposed to keep an evaporator from going below a predetermined pressure and apparently it was some hacks attempt at solving a chronic icing problem.

worked well didnt it

LOL Ok, I get it now, thanks for the info.

[danielthechskid]

Clogged screen at the orifice? That would cause higher than normal superheat, that looks like frost after the EPR, if it is then that means that there is liquid refrigerant reaching the EPR indicating low superheat.