5 Commissioning Instructions
5.1 Flushing, filling, bleeding
Following installation of the water heater it is recommended that both the water heater and any HX coils
be flushed out to remove any debris that may have entered the system prior to or during installation.
To fill the water heater, open a hot water tap until water flows out. Fill any auxiliary circuits (wetback,
heating, solar) according to the manufacturer’s instructions. If the HX supply pipes are routed
downwards, the water heater HX coils must be bled.
5.2 Pressure/leak test
After successful filling and bleeding of the water heater, perform a pressure/leak test. An acceptable
method is to pressurise the cylinder to mains pressure, wait 15 minutes and then inspect the
connections to ensure there are no leaks. Leak test any auxiliary circuits (wetback, heating, solar)
according to the manufacturer’s instructions.
Sigma Sheetmetal Products Limited. Subject to technical modifications Page 11
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