Glycol System - Topping Up

1. Turn off both pumps on the chiller unit.
2. Turn off temp control on all tanks.
3. Do not close any valves on the roof (don't seal the system) - as glycol warms, it expands and can cause fittings to burst.

• Target dilution for the 333 system is -5 (44%). Note (6/27/25): -5 reads as 41%, -10 reads as 44%. Take samples from the red sample valve above the brewery door.
• The glycol reservoir holds 100 gal; the pipes hold an additional 120 gal.
• The sight tube is 18.5", equal to 5.4 gal/inch.
• "Pure" glycol arrives at 76% dilution unless otherwise noted (double-check this against the current supplier). Dowfrost 99 from Cleanedge is about 95% pure.

1. One person should watch the sight glass level on the chiller reservoir from the roof; a second person manages the pump by FV6.
2. Connect the pump's output hose to the jacket access TC fitting on FV6, and the other end into the glycol source.
3. Confirm temps are set so jackets turn on and the solenoids to the glycol system are open, allowing glycol to flow freely into and out of the system.
4. Open valves and let glycol prime the pump by running backward through the system. Drain glycol from the system if needed to reach the proper dilution.
5. Submerge the input hose in the glycol being added.
6. Set the pump to 45-50 Hz and turn it on.
7. Turn the chiller pumps back on and let the system run for 30-45 minutes before turning tanks back on. Wait until the brewery glycol readout is back below 40 before turning tanks on.
8. Keep the glycol reservoir above 85% full (top of the sight glass) to keep air out of the system and keep it running efficiently.
9. Log inputs and notes in the Glycol Tracker sheet.

If tank temps won't hold after topping up, don't seal any roof valves to "fix" it - recheck reservoir level and dilution first, then flag it if it's still off.