COLD MAINS PIPEWORK
Run the cold main through the building to the place where
the STAINLESS UV SYSTEM FIT PRE-PLUMB unit is to be
installed. Take care not to run the cold pipe near hot water
or heating pipework so that the heat pick-up is minimized.
Identify the cold water supply pipe and fit an isolating valve
(not supplied). A 22mm BS1010 stopcock can typically be
used but a 22mm quarter turn full bore valve would be
better as it does not restrict the flow as much. Do not use
“screwdriver slot” or similar valves. Make the connection
to the inlet control set (Position 2). Ensure that the arrow
points in the direction of the water flow. Select a suitable
position for the expansion vessel. Mount it to the wall using
the bracket provided. Ensure the charge in the vessel is 3
Bar. Connect the expansion vessel to the Tee in the cold feed
pipework between the inlet control set and the cold inlet.
On large secondary circulation systems it may be necessary
to incorporate an extra expansion vessel into the circuit to
accommodate the increased system water volume. Ensure
that the top of the vessel is accessible for servicing.
CONNECTING TO THE CYLINDER
All of the pipework connections on the cylinder are 22mm
compression and supplied complete with gland nuts and
olives, in the Accessory Kit box. Only connect 22mm Table
X copper tube to these connections. Cut the tube with a
pipe cutter and ensure no sharp edges or burrs protrude.
Slide both gland nut and olive onto the tube and push tube
fully home into the connection, ensuring the tube end fully
bottoms on the connection recess. Smear the outer wall of
the olive with plumbing paste and tighten gland nut in the
prescribed manner. Upon filling/commissioning, ensure all
connections are completely watertight.
BALANCED COLD CONNECTION
If there are to be showers, bidets or monobloc taps in the
installation then a balanced cold supply is necessary. There
is a 22mm balanced connection on the inlet set.
HOT WATER PIPEWORK
Connect to HWDO (Position 1 on diagram). Run the first
part of the hot water distribution pipework in 22mm. This
can be reduced to 15mm and 10mm as appropriate for the
type of tap etc. Your aim should be to reduce the volume of
the hot draw-off pipework to a practical minimum so that
the time taken for the hot water is as quick as possible.
Where monobloc mixing taps and showers are used, these
should be installed to comply with the Water Supply (Water
Fittings) Regulations 1999. If these devices are supplied with
un-balanced supplies there should be single check valves
installed at both inlets, to stop over pressurising of either
supply.
CONNECTIONS FOR INDIRECT UNITS
Connect to the boiler flow and return (Positions 12 & 14)
lines. An additional expansion vessel and safety valve is
supplied.
Uncontrolled heat sources such as some AGA’s,
back boilers, solid fuel stoves, etc. are NOT SUITABLE. Please
contact our Technical department for guidance. Connect to
(Position
9 & 14
) for the radiator circuits. Twin zone heating
unit are supplied with 2 port zone valves in positions
9a
and
9b
.
CONNECTIONS FOR SOLAR COILS
Connect to the solar coil as detailed on page
13
ensure the
solar pump is connected via the over temperature cut out as
described on page
13
.
SECONDARY CIRCULATION
cylinder can be used with secondary circulation. An
appropriate WRAS approved bronze circulator should be
used in conjunction with a non-return valve to prevent
backflow. On large secondary circulation systems it may be
necessary to incorporate an extra expansion vessel into the
circuit to accommodate the increased system water volume.
A secondary return boss is fitted as standard on 210, 250 &
300 ltr units (
Position 17
). On smaller sizes, tee into the cold
feed pipe above the drain.
IMMERSION HEATERS
Only immersion heaters with a thermal cutout may be used.
To help ensure this, the immersion heaters have a special
1¾” thread. They are rated at 3 kW at 240 V and are of a low
noise Incoloy construction. They have both a thermostat and
a high limit cutout. Please order the correct replacement via
ourselves; fitting non-approved immersions may affect your
guarantee. When fitting, ensure the ‘O’ ring is positioned
correctly on the head of the immersion heater and lubricate
before fitting. Fit it by hand until almost home then tighten
gently as the ‘O’ rings will seal easily. The electrical supply
to each immersion heater must be fused at 13A via a double
pole isolating switch to BS 3456. The cable must be 2.5mm2
heat resistant (85°C HOFR) sheathed flex complying to BS
6141:1981 Table 8. Do not operate the immersion heater/s
until the unit is full of water. Do not operate the immersion
heater/s if any sterilisation liquid is in the cylinder as this will
cause premature failure.
ELECTRICAL CONNECTIONS
Complete the wiring – use the appropriate wiring diagrams
on pages
17 & 18.
as reference. Connections required listed
below.
1
Permanent live
3
Neutral
5 Earth
7
Heating Zone 1 ON from controls
8
Hot Water ON from controls
9
Heating Zone 2 ON from controls (2 zone only)
10
Boiler and pump run
INSTALLATION
SYSTEM FIT
22
STAINLESS UV
UNVENTED HOT WATER CYLINDERS
