1
Introduction & General Requirements
1.1 Installation Requirements
Thank you for purchasing a Grant
vented hot water storage cylinder from
our stainless steel cylinder range. This
installation manual must be read
carefully before you begin installing the
cylinder.
It is vitally important that you have
the correct cylinder to suit your
application and fully read and
understand the instructions
applicable to that type of installation.
If you are in any doubt, stop and
contact the Grant Technical helpline
for assistance.
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 open vented hot water
cylinder, as applicable. Please also
make sure that any installation complies
with the instructions contained in this
installation instruction manual.
1.2 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.
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.
1.3 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.
1.4 About Your New Cylinder
The DuoWave Plus cylinder has three
coils for connection to Primary heat
sources and is available as an Open
Vented hot water system application
only.
This versions is supplied fitted with a
single 3kW electric immersion heater.
Refer to page 10 for further details on
immersion heaters.
The central heating primary from a
‘conventional’ boiler should be
connected to the top 22mm coil, via
the compression connections provided.
The bottom coil should be used for the
Solar Thermal. A Solid Fuel appliance
should be connected to the middle coil,
via the 28mm compression connections
provided. Please refer to the appliance
manufacturers installation instructions
for more information.
1.5 Open Vented Hot Water
Systems
The cylinder is 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. The maximum
head must not exceed 30m.
On no account should any type of valve
be fitted where it would shut off the
boiler from any means of expansion for
the system.
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.
Intr
oduction &
General Requir
ements
3
1.6 Pipework Connections
All Pipework connections to the cylinder
must
be made in accordance with
Figure 2-2.
1.7 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.
1.8 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.
1.9 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.
