Home Heating Boiler Pressure Loss after glycol replacement

Old 11-12-14, 12:40 PM
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Home Heating Boiler Pressure Loss after glycol replacement

Replaced the Crytotek 100 Poly Glycol in my home heating system. Completely drained the system. Pumped 30% mixture into my system with a transfer pump. Bled the air best I could. The system works and I have circulation but I am having to add small amounts of make up over the last couple of days. The system has an autofill plus backflow preventer but I have the autofill valved off because I do not want to dilute the glycol. Could the small amount of make up be needed to maintain pressure be a symptom of air working itself out through the air scoop? No leaks are obvious. Any thoughts would be appreciated.
Old 11-12-14, 03:28 PM
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It most certainly could be due to air removal. I'd monitor it fairly closely over the next few days.

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