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7. Repeat pressurising in incremental steps and allow stabilising until the operating pressure is reached.
8. Close the water supply isolation valve and observe the pressure.
9. Check for leaks at all the connections on the closed circuit. Should a leak be observed at any one of
the connections, immediately release the pressure by gently releasing the lever on the TPR valve in the
storage tank or at the air bleed valve. Rectify any leak that is observed and repeat the pressure test as
described above.
10. Hold the pressure in the system until the pressure remains steady for around 60 minutes.
11. After the pressure test, circulate the fluid. Return to step 6 in Treating the Storage Tank on page 24.
COMMISSIONING
Explain to a responsible officer the functions and operation of the water heating system. Upon completion of
the installation and commissioning of the water heating system, leave this guide with a responsible officer.
TO TURN OFF THE STORAGE TANK
If it is necessary to turn off the storage tank on completion of the installation, such as on a building site or
where the premises is vacant, then:
Shut down the primary water heating plant and switch off the electrical supply at the isolating switch to
the circulating pump(s).
Close the cold water isolation valve on the cold water line to the storage tank(s) to shut down the entire
system, or;
Close the isolation valves on the cold, flow / return and hot water branches to shut down an individual
storage tank in a bank
