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INSTALLATION INSTRUCTIONS
BALANCED HOT & COLD SUPPLY
The installer must safeguard the hot water system from back flow by ensuring the hot
and cold supply to all outlet locations are balanced. All mixer: taps, showers or valve
shall be installed to comply with the Water Supply (Water Fittings) Regulations 1999.
If these devices have un-balanced supplies there must be single check valves installed
at both inlets, to stop over-pressurisation of either supply. Note the inlet control
set provided with this cylinder features a balanced cold connection, to facilitate the
installation of balanced supply.
HOT WATER PIPEWORK
Run the first part of the hot water distribution pipework in 22mm. This can be reduced near
to the outlet to 15mm or 10mm if appropriate, for example to suit the type of tap. You
should aim to keep the run length of any hot water pipework from the cylinder to outlet to
a practical minimum so the time taken for the hot water to reach the outlet is as quick as
possible.
Then connect the hot water pipework to the hot water draw-off on the cylinder
(Position B in the diagrams on pages 9).
CONNECTIONS FOR INDIRECT UNITS
For Solar input models refer to the shaded box before making any connections.
Connect the primary connections using the compression connections provided. The
primary circuit must be positively pumped. Gravity circulation is not suitable. Either
primary connection may be used as the primary flow, reheat times are not affected.
The primary circuit can be open vented or sealed, up to a maximum pressure of 3.5
bar. If you seal the primary circuit an additional expansion vessel and safety valve is
required.
Connect the two port valve into the primary flow pipework. The direction of the flow
arrow should be towards the primary flow connection.
Where connecting to a boiler, the boiler can be Gas, Electric or Oil, but must be under
effective thermostatic control. Uncontrolled heat sources such as some AGAs, back
boilers, solid fuel stoves, etc. are not suitable. Please contact our Technical department
for guidance.
Consult the boiler manufacturer's instructions to confirm sizing is suitable for the heating
system and guidance on positioning.
(CONTINUED)
SOLAR INDIRECT UNVENTED
(TWIN COIL)
Upper coil
The upper coil is connected to the fossil fuel boiler as per the instructions for
the unvented indirect single coil model, with the dual stat control and high limit
thermostat inserted into pocket G2 (boiler). The wiring requirements are shown
on page 13/17
Lower coil: solar installation
The flow and return from the solar heat source are to be connected to the bottom
coil. Either primary coil connection may be utilised as the flow or return. The
solar primary circuit must have its own dedicated circulating pump, thermal
and safety controls, which must be installed as per the solar manufacturer's
instructions. The solar control system used must be of the solar differential
control type and should be connected to the solar sensor.
The solar sensor, supplied as part of the solar controls should be inserted into
Pocket G1 (boiler) and is held in-situ with the black sensor pocket retaining bung
provided.
It is necessary to connect the solar pump via the overtemperature high limit
cut-out (provided) to ensure the heat input to the solar coil is interrupted if the
cylinder overheats. Some method to prevent thermosyphoning must also be
employed. Non-return check valves in the primary flow and return pipework
would be acceptable. If solar controls do not offer appropriate isolation, a two
port zone valve (not supplied) can be used with the pump and high limit stat as
shown on page 14/15.
Note:
If it is intended to fit a cylinder with a solar coil to be used at a later date, the
two coils should be connected in series to make use of the solar coil, using the
dual stat in Pocket G2 (solar) or Pocket G1 (Solar), as shown in the diagram on
page 9.
The Domestic Heating Compliance Guide document L1A and L1B provides excellent
advice in sizing both cylinder dedicated solar areas and heat exchangers to the
surface area of the solar collectors. Using this guide we are able to offer sizing
advice for specification.
Note:
Consult all details of the compliance guide documentation prior to specifying
product or commencing design.
Green Storage WB Range
Installation & Maintenance Instructions
5
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