331camaro wrote:thank you for the advice. now heres a stupid question since im just an electrician not a hvac guy. whats the best way to add the glycol? upside down hose bib? and can i just pour it in with a funnel? does it have to be pre-mixed or can i just dump 3 or 4 gallons in there. i estimate roughly my whole system is about 70-80 gallons? so maybe figure on a 10% mix and get 8 gallons? deffinetly going with spare pumps and gaskets and a nice generator tune up with plenty of fuel on hand. again cant thank you guys enough for the ideas its nice to have someone who already went through it or does it for a living to bounch ideas off of!
Does it have to be pre-mixed - Yes and with high quality water. Best buy it premixed in 55 gallon drums. The suppliers will premix with purified water so no reaction between minerals in the water and the glycol occurs. If you don't and just dump slugs of glycol in the system, you may have slugs of glycol running around for a long time before it mixes. Also, any dead ends such as drain valve may never mix. You must be careful when adding it to ensure no water is trapped in the system that could create a potential freeze spot.
I like to use 30% propylene glycol. It will "burst proof" down to -10 deg. F. Burst proof will prevent the pipes from bursting but the liquid will still be slush, to hard to pump. This will protect a long time as it almost never drops below -10 in our area.
You must pump the glycol in the system. There are a variety of utility pumps you can buy that will work. Stay away from the cheap drill motor pumps. I use a washing machine hose that has a female hose thread coupling on each end for my final connection. Buy two 55 gallon drums for your system. 5 gallon pails are 3 to 4 times more expensive. Keep the spare on hand for future maintenance or replacement.
Glycol only if you must. It is rough on the system and you will find every leak you never knew you had when it cleans out the minerals that was plugging the leak.