Draining the Cooling Circuit

The AON-M2 2020 is equipped with a different style of pump from the original AON-M2 model. Instructions for both systems can be found on this page:

AON-M2 2020 Instructions

Required Tools and Equipment

  • A bucket
  • Hand vacuum pump or compressed air (15psi)
  • A coin or large flathead
  • Tubing 1/4 in. ID x 2 ft.

  1. Use a coin or large flathead screwdriver to remove the cap from the top of the pump.

  2. Place a bucket directly under the radiator bleed valve located at the rear of the printer.

  3. With the pump running, unscrew the bleed valve to let the coolant drain into the bucket.

    Drain coolant using the bleed valve

  4. When the pump reservoir is nearly empty, turn off the pump by separating the male and female connectors.

    Turn off the pump

  5. Attach a piece of tubing to the bleed valve and place the other end in the bucket.

    Attach tubing to the bleed valve.

    If using compressed air, do not exceed 15psi. Exceeding 15psi can cause damage to the cooling circuit.

  6. Place the hand vacuum pump or compressed air source against the opening at the top of the pump reservoir.

    Force air into cooling circuit.

  7. Force air into the cooling circuit to push coolant out of the printer using the hand vacuum pump in the pressurize mode. Do this until all the coolant has been drained.

    Used coolant should always be disposed of according to local regulations.

  8. Remove the tubing from the bleed valve.

  9. Screw the bleed valve shut.

  10. Screw in the cap on the top of the pump reservoir.

  11. Fill the cooling circuit. Refer to Filling the Cooling Circuit.

AON-M2 Original Model Instructions

Required Tools and Equipment

  • A bucket
  • Hand vacuum pump or compressed air (15psi)
  • A coin or large flathead screwdriver

  1. Turn off the pump by separating the male and female connectors.

    Turn off the pump

  2. Place a bucket directly under the radiator located at the rear of the printer.

    Position a bucket to catch the draining coolant.

  3. Use a coin or large flathead screwdriver to remove the black cap on the coolant reservoir.

    Remove the black cap.

  4. Place a cloth or paper towel under the right quick-connect, ready to catch any coolant that may come out.

  5. Disconnect the right quick-connect by pressing on the green collar and gently pulling the grey connector. Quickly put the disconnected tube in the bucket.

    Remove the coolant drain tube.

  6. Let the coolant drain into the bucket.

    If using compressed air, do not exceed 15psi. Exceeding 15psi can cause damage to the cooling circuit.

  7. Place the hand vacuum pump or compressed air source against the green collar of the right quick-connect.

  8. Force air into the cooling circuit to push coolant out of the printer using the hand vacuum pump in the pressurize mode. Do this until all the coolant has been drained.

    Used coolant should always be disposed of according to local regulations.

  9. Reconnect the right quick-connect.

  10. Install the black cap on the coolant reservoir.

  11. Fill the cooling circuit. Refer to Filling the Cooling Circuit.

Last modified: February 17, 2021