Thank you for purchasing a Grant unvented hot water storage
cylinder from our Wave range.
These Installation and User instructions must be read carefully
before you begin installing the cylinder.
The 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 the installation complies with the
information contained in these Installation and User Instructions.
To prevent damage to the coil, cylinder and cylinder connections,
make any soldered joints before connecting pipework to the
cylinder.
We recommend that your Grant unvented cylinder is installed with
an uninterrupted water supply.
Where possible, the unit should be fed via a Ø22 mm supply pipe.
It requires a supply pressure of 1.5 bar with a ow rate of at least
20 litres per minute as a minimum for it to function.
Even with this pressure and ow rate, the ow from the outlets
will be disappointing if several outlets are used simultanteously.
Generally speaking, the higher the supply pressure, the better the
system will function.
The cylinder control equipment is factory set to limit the incoming
system operating pressure to 3 bar. The maximum supply
pressure into the pressure reducing valve (PRV) is 12 bar.
The unit is designed to be oor standing, vertically mounted,
internally 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 heaters.
The cylinder may stand on any at and level surface without any
special foundation requirements, provided that it is suciently
robust to support the full weight of the cylinder (refer to Section
2.1).
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.
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.
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cylinder.
The Grant MonoWave HP indirect cylinder with buer is available
in both pre-plumbed and standard versions.
Both versions are factory-tted with a temperature and pressure
relief (T&P) valve and two 3kW immersion heaters (one in the
cylinder and the other in the buer). Refer to Section 5 for further
details on the immersion heaters.
The pre-plumbed cylinders are factory tted with the following:
Primary circuit pipework
• 1 x 2-port zone valve for hot water
• 2 x 2-port zone valves for heating (for two separate heating
zones)
• 1 x Dual thermostat (cylinder thermostat and high limit
thermostat)
• 1 x Auto air vent (on the ow pipe)
• 1 x 22 mm gate valve bypass
Cold water inlet pipework
• 1 x Temperature and pressure relief valve
• 1 x Cold water inlet manifold
• 1 x Tundish
• 1 x Wiring centre (pre-wired to the zone valves and dual
thermostat)
• 2 x 3kW electric immersion elements (one in the cylinder and
one in the buer)
Both pre-plumbed and standard versions have a single coil
designed for connection to an air source heat pump, such as
the Grant Aerona³ range. If another make of heat pump is to
be connected, please refer to the manufacturer’s installation
instructions for more information.
The coil must be connected using a 2-port motorised valve
(factory tted on the pre-plumbed versions) to shut o the ow
from the primary source and electronically interlocked with the
heat source via the cylinder control and high limit thermostat. This
valve is factory tted on the pre-plumbed versions and supplied
loose with the standard cylinder versions.
Failure to t this 2-port valve will invalidate all guarantees and will
be in breach of the Building Regulations Approved Document G3
(2010). More information on electrical wiring is given in Section 5
of these instructions.
Both pre-plumbed and standard versions also have a 50 litre
buer tank, located below the cylinder within the same casing.
The buer tank can be used in one of two ways, depending on the
system requirements as follows:
1.
Where the ow and return connections from the heat pump
are connected to one side of the buer and the ow and
return connections for the system (including the cylinder) are
connected to the other side.
Refer to Figure 3-1 for details of the pipework connections for
this option.
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2.
To simply increase the volume of the primary circuit when
required. Refer to the heat pump requirements given in the
Aerona³ Installation and Servicing Instructions for further
details.
In this case, the ow connections on either side of the buer
are capped o and the return from the heating system
connected to one side of the buer, with the return to the
heat pump connected to the return connection on the other
side.
Refer to Figure 3-2 for details of the pipework connections for
this option.
