Step 9 Plate Heat Exchanger Maintenance
1. Close the isolating ball valve located on the bypass circ flange, connect a drain hose to the hydronic bypass wye
strainer, open flush valve, and flush into a bucket to remove debris. Close flush valve, remove drain hose, open
isolating ball valve on bypass circ flange, and confirm boiler pressure is adequate, adding makeup water if
necessary.
2. Open a fixture and wait until hot water is continuously flowing. Turn the mixing valve up and down in temperature
to ensure that it moves freely. Set the mixing valve temperature feeding the domestic hot water fixtures to the
desired temperature of approximately 120°F using mixing valve.
Note: If the domestic water supply is “hard” with high mineral or lime content, clean and flush when necessary.
Symptoms include poor hot water quality or low domestic hot water flow. See Hot Water Maintenance for
mineral cleaning and flushing instructions. Consider installing Scale Stopper (EK P/N: 10-0650) or water
softener in hard water conditions so recurring plate heat exchanger cleaning will no longer be necessary in most
circumstances.
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