in a closed residentil system-cost of replacing glycol

Ragu_5

Once it has been determined that your system is definitely a "glycol necessary" system, then a few things change and must be respected.

Anytime the system is opened up to the atmoshphere (fixing leaks, cutting pipes, changing fittings and valves etc.), the system MUST be purged of air and the glycol level must be retained; there is a certain level of skill involved in this, and a corresponding certain level of cost.

It is ABSOLUTELY imperative that the system be labelled as a glycol-containing system, as uninformed "others" may inadvertantly drain and or dilute your glycol when making the above-mentioned repairs.

Furthermore, the introduction of glycol into a heating system automatically puts that system in need of an annual (or bi-annual) glycol maintenance program. Let's face it: this stuff is expensive. Propylene glycol is the same chemical that is used to de-ice airplanes, and we don't want to waste it or let it go bad on us. Yearly testing of concentration, Ph and reserve alkilinity is mandatory. Glycol tends to turn acidic over time, but it can be brought back to decent parameters, if caught in time.

Sounds like a lot, but the good guys will do this as part of the job. Good luck! Jack



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Peggy

replenishing glycol in hydro air system

After our hvac service people replaced the zone valves on our system, air got in the pipes so they had to purged the system. We have been told to call a plumber and have the antifreeze relaced or we are in danger of freezing pipes in the attic. After an exhausting search for someone qualified to do this, we are finding that it will take 2 men, four hours, and cost about $900.00 and that this should be done every 3 years! Does this sound like normal maintenance for a residential system? We live in southwest CT.