Adding Water to Geothermal Loop

First, why would/do you need to add? There should be no need w/o a leak so first need to find out where it's going.

Also, it's a glycol or other anti-freeze solution along w/ some other conditioners so depending on how much, need appropriate additive(s) to maintain proper freeze point, lubricity, corrosion inhibitors, etc., ...

IOW, its more than just adding tap water.

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Yes, I believe there is a leak. It seems it has to topped off every year.

The HVAC pros have never added any additive. I live in OK by the way.

I'm just trying to learn as much as possible about the unit.

Needless to say, that ain't right although if it is still small may limp by but I'd expect a catastrophic failure down the road at some time.

Just because "the pros" haven't added anything doesn't mean they shouldn't have done...

What make/age? -- the Water Furnace we had in TN had a 20 or 25 year warranty on the loop so I would have simply called the installer and said "fix it". Is this buried horizontal loop, deep/well loop, submerged pond/lake loop??? Who did the installation--these same folks or somebody else?

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dpb, You are giving out incorrect info. Most geothermal systems will require being re-pressurized after about 1 year. The tubing does actually expand slightly. They make a tool that has a needle type puncturing device along with a short piece of hose, guage and valve. You hook it up to the tap water and puncture the resealable valve on the Geo unit. It literally takes only a couple ounces to bring the pressure back up. After that one time, it shouldnt have to be done again unless there is a leak. If it is constantly being refilled each year you should consider repairing the leak or replacing the loop. I would also have the solution checked as they WILL FREEZE if not concentrated properly. The tubing is usually guaranteed for about 25 yrs but I doubt that the installer is going to warranty his labor that long. :-) Have fun Bubba

Bubba wrote: ...

No, as you go on to say, as OP says, if the system needs re-filling every year, there's a problem...

The Water Furnace system in 10 years never needed re-pressurizing.

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replying to 12oon, Randy wrote: what PT port do you add the water IN or OUT