Glycol ratios in a draft chiller/power pack
Glastender recommends 1 part glycol to 3 parts water. http://www.glastender.com/PDF/LC85,%2044,%2065,%2086,%2047.pdf
Micro-Matic recommends 1 part glycol to 2.5 parts water. http://www.micromatic.com/draft-keg-beer/glycol-pid-60703.html
In our experience, these ratios do not contain enough glycol to adequately remove the heat from a draft system. We often see rations of 1 to 1 that are not capable of fixing faucet temperature problems. If you have dispensed temperature issues, and have verified other possibilities, you may want to change the glycol to 75% glycol and 25% water. In our experience, this is a better solution for temperature extraction.