1. Turn the system off and let it cool.
2. Close the valve to the expansion tank to isolate it from the rest of the system.
3. Place a bucket underneath the drain valve or attach a hose to it that terminates in a bucket or drain.
4. Open the valve on the bottom of the expansion tank and let it drain. (You may need to open a small vacuum breaker plug on the tank to get it to drain properly.)
5. Once the tank is drained, simply reverse the process to fill it.
Check your owner’s manual for more specific instructions.

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