1. Attach a hose to the glycol outlet connection of any channel.
2. Put the free end of the hose into a bucket or sink for the glycol mixture to exit into.
3. Turn the Glycol Chiller on. Then make sure all number buttons are in their OFF position (unlit).
4. Enter pump override mode by pressing and holding the “▲” button for 5 seconds. The SET button should be flashing to indicate the chiller is in pump override mode. This disables the low glycol level warning and also allows the pump to run without a cooling signal from a Grainfather Conical Fermenter.
5. To begin removing the existing glycol mixture from the glycol tank, press the number button on the Glycol Chiller that corresponds to the outlet where you have attached the hose. When the glycol stops flowing, press the number button to stop the pump.
6. Turn the chiller off.
7. Discard the glycol mixture you have removed from the chiller.
8. Before replacing the glycol in the tank, you will need to clean the glycol filter. Remove the white cap of the glycol filter located on the back of the chiller. Remove the filter from inside the housing, then rinse with clean water ensuring it’s free from any foreign matter. Replace the filter into the housing and replace the cap tightly.
9. You will now need to top up the glycol tank with 6 L (1.6 US Gal) of glycol mixture (consisting of 2 L (0.5 US Gal) glycol & 4 L (1 US Gal) water). Top up as per the Topping Up the Glycol Tank sub-section (page 11).

Note: Running the pump dry for an extended period of time will cause damage to the pump. Do not leave the GC4 unattended when in pump override mode.