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3. GENERAL REqUIREMENTS
3.1.
The
RD SERIES
domestic hot water cylinder
MUST
be installed by a competent person in
accordance with section
G3
of the current
Building Regulations.
3.2. Important
- It is important that the installer reads and understands these instructions,
unpacks and familiarises themselves with the equipment before commencing the installation.
Failure to observe these installation instructions could invalidate the warranty.
3.3. Water supply
– The water supply to the cylinder should be potable water direct from a public
mains water supply with any water treatment equipment functioning correctly.
For optimum performance the unit should be fed via a 15 mm or 22 mm diameter supply pipe
direct from the mains water entry point to the property with supplies a maximum pressure of
0.9 MPa. The unit can operate with a minimum supply pressure of 0.15 MPa and a flow rate of
at least 20 litres per minute, but flow from the outlets will be low if several outlets are used
simultaneously. The cylinder control equipment is factory set to limit the system operating
pressure to 0.3 MPa. The maximum supply pressure into the pressure-reducing valve is 0.9 MPa.
3.4. Taps and fittings
- All taps and fittings incorporated in the unvented system should have a
rated operating pressure of 0.7 MPa or above.
3.5. Location
– The unit is designed to be vertically wall 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 sheathed heating elements.
The wall onto which the cylinder is mounted should
be of good sound masonry construction capable of
holding the weight of the cylinder when full of water
(see
technical specifications
for weights).
The position of the cylinder should be such that easy
access is provided for servicing the controls and
replacing the sheathed heating element should the
need arise.
Pipe runs should be made as short as possible and
lagged to prevent heat loss.
To allow for servicing and repairs the unit must be
mounted at least 540 mm above any surface or object,
so that access can be gained to electric connectors
and the heating elements may be removed.
The unit should be mounted close to an external wall
so that the discharge pipe D2 can be routed to a safe
visible place.
The tundish should be mounted in a visible location
so that it may easily be inspected.
Fig 1 - Minimum margins for servicing and repairs.
150 mm
100 mm
100 mm
540 mm
