Filling the Cooling Circuit

Prerequisite

AON3D now uses a different coolant solution from the one originally shipped with the AON-M2. We advise you to switch coolants when performing the recommended maintenance coolant flush every six months. Perform a full coolant flush if switching types of coolant. Do not mix different types of coolant.

Required Tools & Equipment

  • A coin or large flathead driver
  • A small flathead screwdriver
  • 3 bottles of coolant (from Box A)
  • A cloth (to catch excess coolant)

Do not use water alone or any other coolant mixture not authorized by AON3D. Do not mix or dilute the provided coolant, unless otherwise indicated on the coolant bottle or instructions sent from AON3D. Improper coolant can lead to potential failures, including: galvanic corrosion, algal growth, scale formation, and polymeric degradation. Any of these issues will negatively affect the performance of the cooling system and can lead to catastrophic component failure.

The cooling system takes 1.6L of coolant to fill. You may have additional coolant left after filling the cooling system. Keep this to top up the system over time.

Preparation

Please note the safety warnings from the supplier and use any necessary personal protective equipment (PPE) while handling the coolant.

The coolant bottles come with a spout assembly to help pour the coolant cleanly. Part of this assembly is a small tube packaged with the coolant.

Koolance bottle and tube

  1. To assemble the spout, first remove the cap. Inside there is a rubber nozzle. Remove this.

    Rubber nozzle under cap

  2. Carefully pop out the centre of the cap. Keep this centre piece if you want to reseal the bottle later!

    Pop the centre of the cap

  3. Take the rubber nozzle and place it on the bottle opening. Secure it in place with the cap.

    Rubber nozzle in place

  4. Take the clear tube and insert it into the nozzle. This is your completed setup for pouring the coolant.

    Coolant ready to pour

Filling the Pump Reservoir and Radiator

  1. Turn off the pump power by separating the male and female connectors. This is shown in the following image.

    Show power connector

  2. Ensure that you don’t hear the pump running.

  3. In the pump reservoir, remove the black cap with a large flathead driver or a coin.

    Show black cap

  4. Fill the pump as full as possible with coolant.

    Pour the coolant at a slow and steady pace to ensure that the coolant mixture does not spill.

Show pouring coolant

Priming the Pumps

  1. Set both pumps to speed 5. The controller dials are numbered from 1 to 5. They are located on the rear face of the pump motors.

    Show controller dials

    The pump may make a grinding sound. Completing the pump fill cycle will resolve this. The coolant pumps are not intended to be run dry. Avoid having the pumps run when the reservoir level is low. The pumps are most effective at driving air out of the system when the reservoir is near full before starting the pump so make sure to top up between each fill-pump cycle.

  2. Disconnect the left quick connect by pressing on the green collar and gently pulling the grey connector.

    Disconnecting the left hose

  3. Reconnect the pump power. The coolant level will drop.

  4. Fill the reservoir with coolant and make sure the pump is as full as possible.

  5. As the coolant pours out of the left connector, reconnect the left quick connect. Now the system should have full circulation. Have a cloth handy to catch coolant flowing from the tube.

  6. If you find the pump is still unable to fill the circuit, cycle the pump power on and off a few times. This dislodges any air clogging the circuit.

  7. Now the system should have full circulation. If the system still does not have full circulation, complete steps 8 though 12.

  8. Disconnect the pump power.

  9. Disconnect the right quick connect by pressing on the green collar and gently pulling the grey connector. Have a cloth handy to catch coolant flowing from the tube.

  10. Connect the pump power. The coolant level will drop.

  11. Fill the reservoir with coolant and make sure the pump is as full as possible.

  12. As the coolant pours out of the right connector, reconnect the right quick connect. Now the system should have full circulation.

Flush Out Any Remaining Bubbles

  1. Decrease the pump speed to 1. The flow should become laminar and free of bubbles.
  2. Leave the black cap off.
  3. Let the pump run for about an hour. The bubbles will disappear as the coolant circulates.
  4. Ensure that you don’t hear the pump running.
  5. Attach the black cap on the pump reservoir with a large flathead driver or a coin.
  6. Make sure the pump is always as full as possible with coolant and keep it full when operating the printer.

The pumps must be set to 1 during normal operation to avoid trapping air bubbles in the flow. This enables the radiator to cool down the coolant which cools the printer components.

Last modified: October 30, 2019