# Thread: Found this on a heat pump

1. ## Found this on a heat pump

Found this on a heat pump. need I say what's wrong? Not sure if this is what killed the compressor or not.

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you'll know when you cut that puppy out of there.

3. Originally Posted by dandyme
you'll know when you cut that puppy out of there.
What?

I replaced it with the correct bi flow filter drier when I replaced the compressor today. I can't believe it took a few years to kill the compressor.

Originally Posted by air1
What's the difference between a bi-flow and a uni-directional? Would a uni-directional prevent flow in the opposite direction?
Yes it would.

http://www.thefreedictionary.com/unidirectional

Last edited by NY2GA01; 12-28-2012 at 10:43 PM.

4. What's the difference between a bi-flow and a uni-directional? Would a uni-directional prevent flow in the opposite direction?

5. Lol. It might help to have a bi flow. I went to a call after a fellow tech installed a straight cool filter/dryer backwards. I showed it to him. and he blew through it backwards and said "whats the difference"? I said blow through it at 250 psi

6. Originally Posted by GJ-HVAC/R
Lol. It might help to have a bi flow. I went to a call after a fellow tech installed a straight cool filter/dryer backwards. I showed it to him. and he blew through it backwards and said "whats the difference"? I said blow through it at 250 psi
The 250 psi is relative to atmospheric pressure. The differential pressure across the drier is almost zero. So the amount of resistance to flow should be no different than blowing through it with your mouth.
I think the difference is in the configuration of the screens and desiccants.

7. Originally Posted by air1
The 250 psi is relative to atmospheric pressure. The differential pressure across the drier is almost zero. So the amount of resistance to flow should be no different than blowing through it with your mouth.
I think the difference is in the configuration of the screens and desiccants.
Correct.

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did anything fall out of the drier when you removed it (hopefully you cut it out instead of unsweating it)?

9. Originally Posted by dandyme
did anything fall out of the drier when you removed it (hopefully you cut it out instead of unsweating it)?

I did cut it out, and no, nothing came out.

10. So what direction did he choose?

11. Originally Posted by NY2GA01
Found this on a heat pump. need I say what's wrong? Not sure if this is what killed the compressor or not.
Maybe he thought your supposed to replace it every spring and fall.

12. Got a walk-in freezer out there that's been running for at least 10 years with the dryer piped in backwards. I think it just doesn't filter properly being installed in the wrong direction and has no affect on flow!

13. Originally Posted by KB Cool
Got a walk-in freezer out there that's been running for at least 10 years with the dryer piped in backwards. I think it just doesn't filter properly being installed in the wrong direction and has no affect on flow!
but this was a heat pump, so the use of a one way filter is like having no filter at all.

Still not a 100% on if it killed the compressor.

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