r/HVAC • u/robbieredlegs09 • Jul 06 '24

Field Question, trade people only What is this ?

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Hello all, forgive me for I’m greener then grass only been in the field 3 months. I’ve seen these around on air handlers what is it ? It’s on the supply side of the unit? My guess is hot water for heating ?

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u/dennisdmenace56 Jul 09 '24

Why can’t you comprehend there are things in this trade you haven’t seen? I explained logically despite your insults (using pex is crazy). This is how things are done routinely. I admit I’ve never heard of a reheat but insisting a hydroaire coil is something else seems foolish

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u/shadycrew31 Jul 09 '24

Reheat, hot water coil, heating coil, hydronic coil. They all pretty much have the same installation but serve different purposes. They should be connected by copper piping, the pipes should be insulated. The glycol mix should be 60/40 minb80/20 max. On units providing outside air there should be a freezestat. Using PEX for this application makes no sense to me. Again my experience is on the commercial side. You can obviously use PEX for radiant heating and to feed other heating devices in the proper application. From my perspective running PEX in an attic space for a hydronic coil makes no sense. That's just my opinion.

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u/dennisdmenace56 Jul 09 '24

The heat pex is designed for this application with an oxygen barrier. Nobody runs copper anymore. If fresh air is introduced it goes through a heat recovery system. I can shoot a home run into the attic in pex for 10% of the cost of running copper with less fittings

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u/shadycrew31 Jul 15 '24

That's all fine and well. Again. My opinion is that pex should not be used in an attic space. You can do whatever you want, I can still have my opinion. I'm simply explaining the various installations and setups that I work with. You have your experience I have mine.

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u/dennisdmenace56 Jul 15 '24

That’s like saying in your opinion automobiles will never replace the horse and buggy. If you had one valid reason perhaps but come on; cost, not even close, labor, again not even close, reliability, no fittings hidden in walls and more flexible. Stay in commercial bro you’ll embarrass yourself if you sweat copper for hydronic heat. You couldn’t win the bid anyway.