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Thread: Refrigerant piping design
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28-03-2010, 02:01 PM #1
Refrigerant piping design
I recently completed an installation of a Liebert unit for a data room. This system consisted of a roof mounted condenser and the air handler section, w/compressor one floor below. The Liebert installation manual requires an inverted trap on both the discharge and the liquid line. I have read in other souces that the trap in the liquid line is not necessary. My understanding is that it prevents liquid from siphoning out of the condenser, and that it prevents liquid from migrating back to the condenser during the off cycle. It would seem to kepp any aditional weight from liquid refrigerant off the L.L. solenoid or the TXV for units without a solenoid. Any input would be appreciated
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28-03-2010, 02:49 PM #2
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Re: Refrigerant piping design
My understanding is that it prevents liquid from siphoning out of the condenser, and that it prevents liquid from migrating back to the condenser during the off cycle.
If there is no solenoid valve at liquid line it is possible that all liquid migrate from condenser to evaporator during off period (TXV is never 100% closed) and when compressor start, high risk of liquid in compressor is possible.Last edited by nike123; 28-03-2010 at 03:07 PM.
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30-03-2010, 12:48 AM #3
Re: Refrigerant piping design
I definately followed the installation manual. I just want to make sure I have a correct understanding of why this is required.
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31-03-2010, 01:08 AM #4
Re: Refrigerant piping design
I tried to attach the installation manual, for some reason I couldn't make that happen. It does require inverted traps. It looks like they replaced the L.L.trap in your drawing with a check valve? I don't mean to sound like a dope, I'm fairly new to the trade. I've been an electrician for 23 years. I'm what you might call a re-tread!
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31-03-2010, 09:03 AM #5
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31-03-2010, 04:53 PM #6
Re: Refrigerant piping design
Thanks very much
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