Hot Water
Energy
Storage
Unvented Cylinder
Installation & Maintenance Instructions for an unvented
hot water cylinder with internal thermal expansion
SEPT 2018
22
Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the
correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer’s instructions by
competent persons and that it meets the requirements of the appropriate Building Regulations. The Benchmark Checklist can be used to
demonstrate compliance with Building Regulations and should be provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing work in accordance with the Benchmark Code of Practice
which is available from the Heating and Hotwater Industry Council who manage and promote the Scheme. Visit www.centralheating.
co.uk for more information.
SERVICING
GENERAL
Servicing should only be carried out by competent installers
and only spare parts approved by the manufacture may be
used. NEVER bypass any safety devices or operate the unit
without them being fully operational.
DRAINING
Isolate from the electrical supply to prevent the immersion
heaters burning out. Turn off the boiler. Isolate the unit from
the cold mains. Attach a hose to the draining tap ensuring
that it reaches to a level below the unit (this will ensure an
efficient syphon is set up and the maximum amount of water
is drained from the unit). First open the hot tap closest to the
unit and then open the draining tap.
WARNING: WATER DRAINED OFF MAY BE VERY HOT!
IMPORTANT: After draining the cylinder do not close the hot
tap until the cylinder has fully cooled, failure to follow this
instruction may result in damage to the cylinder and will
invalidate the guarantee.
ANNUAL MAINTENANCE
The unvented cylinder requires an annual service in order to
ensure safe working and optimum performance. It is essential
that the following checks are performed by a competent
installer on an annual basis. Commonly this is done at the
same time as the annual boiler service.
Water may drip from the discharge pipe of the pressure-relief
device and that this pipe must be left open to the atmosphere.
The pressure-relief device is to be operated regularly to remove
lime deposits and to verify that it is not blocked.
An annual service should include the following as a minimum
1. Recharging of the expansion volume
2. Checking of all safety valves to ensure they are not leaking
and function correctly
3. Testing of thermostats to ensure they are functioning
correctly
4. Cleaning of filter on inlet control set
5. Test immersion heater for continuity and resistance
6. Record temperature of hot water at outlet after
1 minute of flow
7. Ensure discharge pipe discharges fully
8. Complete Benchmark Service record
9. Inspection of all electrical connections and cords
If the supply cord is damaged, it must be replaced by a
qualified person in order to avoid a hazard
Kingspan have a policy of continuous product development and may introduce product modifications from time to time.
As a consequence details given in this brochure are subject to alteration without notice. E&OE.
