How to Winterize a Pearson Water Chiller

November 7, 2023

1. Turn off the main power to the unit. Set the SW1 and SW2 to the off position. Remove the side panel above the water inlet and outlet. Close water valves at the storage tank. Drain the water from the cooling piping and from the heat exchanger. This should be done by removing the plug from the bottom of the chiller circulating pump, and removing the plug from the chilled water out let piping (this plug is located down stream of the flow switch just before the exit of the chiller), open the valve on the Y strainer and open any drain valves on the piping. After the system is drained take necessary steps to insure the chiller is isolated from any water source when not in use. 

2. After the water has been drained close the valve on the inlet and outlet pipes. Replace the drain plugs and close the valve on the strainer. Next remove the pressure gauge from the inlet pipe and fill the system with at least two-three gallons of antifreeze. Pink RV type antifreeze is acceptable. This gauge is inside of the chiller in the heat exchanger inlet pipe. After adding the antifreeze confirm the plugs and gauge are reinstalled. Contact Pearson Heating Systems at (410) 770-4617 if you have any questions. 

3. Cover the chiller when not in use. Covering the chiller will keep dirt and dust out of the condenser coil and other chiller components. Protecting the chiller from dirt and dust when not in use will greatly extend the life of the chiller. 

Step 2 is critical since it is impossible to drain all of the water from the heat exchanger. Failure to add antifreeze to the heat exchanger will cause the heat exchanger to freeze and fail. Heat exchangers damaged from freezing WILL NOT BE COVERED UNDER WARRANTY! This information can be found on page 49 of the installation and service manual. Not following these instructions may severely damage your machine and void the warranty. If there are any questions or concerns please contact Pearson Heating Systems at (410) 770-4617.