1
Introduction & General Requirements
1.1 Installation Requirements
Thank you for purchasing a Grant
unvented hot water storage cylinder
from our Wave range. This installation
manual must be read carefully before
you begin installing the cylinder.
This cylinder must be installed by a
competent person in compliance with
all current legislation, codes of practice
and local by-laws covering the
installation of an unvented hot water
cylinder. Please also make sure that any
installation complies with the
instructions contained in this installation
instruction manual.
1.2 Water Supply Requirements
We recommend that your Grant
Unvented cylinder is installed with an
uninterrupted water supply.
Where possible the unit should be fed
via a Ø22mm supply pipe. It requires a
supply pressure of 1.5bar with a flow
rate of at least 20 litres per minute as a
minimum for it to function. Even with
these rates, flow from the outlets will be
disappointing if several outlets are used
simultaneously. Generally speaking, the
higher the supply pressure, the better
the incoming system will function. The
cylinder control equipment is factory set
to limit the incoming system operating
pressure to 3bar. The maximum supply
pressure into the pressure- reducing
valve (PRV) is 12bar.
1.3 Location
The unit is designed to be floor
standing, vertically mounted, indoors, in
a frost-free environment. When
choosing a suitable location for the
cylinder, consideration should be given
to the routing of the discharge pipe to a
convenient point and also the availability
of an adequate power supply for
connecting the immersion heater(s).
The cylinder may stand on any flat and
level surface without any special
foundation preparations, provided that it
is sufficiently robust to support the full
weight of the cylinder. (Refer to
Technical specifications for weights).
The position of the cylinder should be
such that easy access is provided for
servicing the controls and replacing the
immersion heater should the need arise.
Generally, pipe runs should be made as
short as possible and lagged to prevent
heat loss.
1.4 Storage and Handling
If the cylinder is not being installed
immediately, it should remain in its
carton to prevent damage. We
recommend that the cylinder be
transported to its installation position
on a sack truck or similar whilst still
within the carton.
1.5 About Your New Cylinder
DuoWave Solar and DuoWave HP
indirect cylinders have two coils for
connection to Primary heat sources.
For Solar Thermal to be connected, the
bottom coil must be used. Please refer
to the manufacturers installation
instructions for more information.
The central heating or heat pump (HP
version) connections should be made to
the top coil.
DuoWave Solar and DuoWave HP
indirect cylinders are also supplied fitted
with a single 3kW electric immersion
heater.
DuoWave Solar direct cylinders have a
single coil only for connection of solar
thermal, but are also supplied fitted with
two 3kW electric immersion heaters.
Refer to page 15 for further details on
immersion heaters.
In all cases, each coil must be
connected using a 2-port motorised
valve to shut off the flow from the
primary source and electrically
interlocked with the heat source via the
cylinder control and limit thermostat (for
solar installations a high temperature
2-port or solenoid valve must be used).
Contact Grant UK for details.
Failure to do so will invalidate all
warranties and will be in breach of
The Building Regulations Approved
Document G3 (2010).
More information on electrical wiring is
given on pages 15-20.
1.6 Open Vented Hot Water
Systems
If required, your Grant DuoWave
Cylinder can be used as part of an
Open Vented hot water system, i.e. fed
from a cold water storage cistern and
fitted with an Open Vent pipe, provided
the maximum head does not exceed
30m.
Intr
oduction &
General Requir
ements
3
When used in this way, it will not be
necessary to install the expansion
vessel and cold inlet manifold supplied
with the cylinder.
Note:
The Temperature and Pressure relief
(T&P) valve should be left connected to
the cylinder (as supplied). As it may still
operate due to temperature it should be
connected in the correct manner – refer
to guidance given in Section 4 of these
Instructions.
1.7 Taps and Fittings
All taps and fittings incorporated in the
unvented system should have a rated
operating pressure of 7 bar or above.
1.8 Pipework Connections
All Pipework connections to the cylinder
must
be made in accordance with
Figures 2-4 to 2-6 as appropriate.
1.9 Scaling
In hard water areas scaling will form
inside the cylinder and this will reduce
both the performance and working life
of the cylinder. Where the total
hardness exceeds 125ppm a high
capacity water softener, or suitable
water conditioner, should be installed in
the incoming cold water supply to the
cylinder.
It is recommended that the water
temperature control thermostats (on the
immersion heaters and dual
thermostats) fitted to the cylinder be set
no higher than 60°C to minimise scale
build up.
1.10 Insulation
All Grant Cylinders are insulated with
40mm thick CFC/HFC free, fire
retardant, polyurethane foam injected
between the stainless steel cylinder and
the outer casing. This polyurethane
foam has a Global Warming Potential
(GWP) of less than 3 and an Ozone
Depletion Potential (ODP) of 0.
1.11 Health and Safety
The information supplied in the table in
Section 2 Technical Specification will
help you assess the safest way to
manoeuvre your cylinder into position.
Please use the table to find the empty
weight of your cylinder and then
consider how you can safely move it
into its final position.
Please leave this manual with the
householder after installation.
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