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Green Storage WB Range
Installation & Maintenance Instructions
COMMISSIONING
STERILISATION
Only switch on power to the immersion heaters once sterilisation liquid has been purged
and the cylinder filled with water.
FLUSHING & FILLING THE CYLINDER
Check that the pressure in the expansion vessel is 3 bar (45PSI), i.e. the same as the
setting of the pressure reducing valve. The valve is of the car tyre (Schrader) type. Check
all the connections for tightness including any factory made connections such as the
immersion heater and the temperature and pressure relief valve. Before filling, open the
hot tap furthest away from the unvented cylinder to let air out.
Open the cold main isolation valve and allow the unit to fill. When water flows from the
tap allow it to run for a short while to flush through any dirt, swarf or flux residue. Close
the tap and open every other hot tap in turn to purge all remaining air.
INDIRECT UNITS
Ensure the heating circuit has been fully flushed, carrying out commissioning in line with
the boiler or solar thermal manufacturer's commissioning instructions for the heating and
the primary circuit. Primary pipework must be filled, vented and tested in accordance
with the boiler manufacturer's instructions. To ensuring all pipework is fully vented, bleed
valves may need opening, especially on any raised pipes; inadequate flushing or venting
could cause damage to the circulation pump.
Ensure the lever on the two port valve is set to the filling position and fill the primary
circuit; ensuring the appropriate inhibitors are added in the right concentrations. 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 55°C
and 65°C as required. Allow unit to heat up, adjust the thermostat so that the heater
switches off at 60°C. Record information on the Benchmark Commissioning Checklist
(Page 21).
STORAGE TEMPERATURE
The recommended storage temperature setting for the cylinders is 60-65°C. 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.
18
SAFETY CHECKS
During heat-up double check all pipework for leaks, ensuring all connections including
the immersion heaters and any pre-plumbed connections are water tight. There
should have been no sign of water coming from either the expansion relief valve
or the temperature/pressure relief valve. Now hold both of these safety valves fully
open, allowing as much water as possible to flow through the tundish. Check that
your discharge pipework is free from debris and is carrying the water away to waste
efficiently. It is normal that some water will splash out of the tundish. This should be
minimised by ensuring the tundish, D1 and D2 pipes are vertical to allow clean flow.
Release the valves and check that they reseat properly. On completion of commissioning,
fill in the Benchmark Commissioning Checklist & leave with the homeowner.
BENCHMARK SCHEME
The installer must follow the Benchmark code of practice for the Benchmark certification
to be valid. The Benchmark code of practice can be found online
via www.centralheating.co.uk
DECOMMISSIONING & DISPOSAL
Damage to the environment and risks to personal health are avoided by the proper
decommissioning and disposal of this product.
To decommission your unvented hot water cylinder, isolate the electricity supply to the
immersion heater and boiler/solar system, before draining the cylinder and safely
disconnecting all fixtures and fittings.
The cylinder is made from many recyclable materials; therefore we strongly
encourage recycling of this product at your Local Authority recycling centre at the end
of its working life. For more information on proper disposal, please contact your local
council or waste disposal office.
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