User Manual Q&AAnswer
Apr 07, 2025 - 11:43 AM
To prime the pump on the Grainfather GC4 Glycol Chiller, follow these steps:
1. Make sure the chiller has been standing upright for 24 hours before turning it on.
2. Begin with the chiller off and ensure that the glycol filter cap is screwed on tightly.
3. Open the cap on the top of the chiller and use the included Grainfather glycol funnel with mesh filter to pour 4 L (1.06 US Gal) of water into the tank. Close the cap and let the chiller rest for a minimum of 5 minutes.
4. Connect the included silicon hose to the glycol mixture outlet connection (silver in color with blue cap) under number 4. Insert the free end of the hose into the opening of the glycol tank.
5. Prepare 2 L (0.53 US Gal) of propylene glycol in a jug.
6. Turn on the chiller by plugging in the power cord and pressing the power button. The chiller will make a beeping noise and an exclamation warning light will flash, indicating low glycol level.
7. Press and hold the " " button for 5 seconds to enter the pump override mode. The SET button should be flashing to indicate the chiller is in pump override mode.
8. Press the number 4 button to start the pump. After 2 minutes, press the number 4 button again to stop the pump.
9. Pour the pre-prepared 2 L of propylene glycol into the tank using the funnel with mesh filter. 1 minute after the pump was stopped, press the number 4 button again to start it. You should start to see bubbles and liquid in the hose flowing from the outlet connection to the opening of the glycol tank.
10. Repeat the cycle of having the pump on for 2 minutes, then off for 1 minute until only liquid (no visible bubbles) is flowing in the hose. Then, press the number 4 button to stop the pump and close the port.
11. Turn off the chiller, disconnect the silicon hose, and close the cap.
Your Glycol Chiller is now primed and ready for use.
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