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Commissioning
Filling
First you must ensure that the pressure in the expansion vessel is the same as the setting of the
pressure reducing valve i.e. 3 bar (45PSI). The valve is of the Schrader car tyre type. Check all the
connections for water tightness including any factory made connections such as the immersion heater
and the temperature and pressure relief valve. Prior to filling, open the hot tap furthest away from the
cylinder to expel air. Open the cold main isolation valve and allow the unit to fill.
Once the cylinder has been fully commissioned it should be heated to its normal operating
temperature. Draw off secondary hot water to each outlet and allow hot water to flow from each
outlet for at least 30 seconds to remove any flux residue from the pipe work within the secondary
hot water system. Then fully drain the cylinder and re-fill to ensure that all flux residues are removed
from the system.
Indirect Units
Fill the primary circuit according to the boiler manufacturers' commissioning instructions. Any
additives used in the heating system water circulating through the cylinder coil must be compatible
for use with stainless steel cylinders.
Ensure the lever on the two port valve is set to the filling position. When full, move the lever back.
Switch the programmer to Domestic Hot Water (DHW) and allow the unit to start to heat. Adjust the
dial of the dual thermostat to between 30°C and 70°C as required.
Storage Temperature
60-65°C is the recommended storage temperature for both Multi Energy and Indirect cylinders. In
hard water areas consideration should be given to reducing this to 50-55°C. In many healthcare
applications the guidance on Legionella control and safe water delivery temperatures will require
storing the water at 60-65°C, distributing at 50-55°C and using thermostatic mixing valves to control
the final temperature. For details consult the NHS Estates Guidance on safe hot water temperatures.
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