SOLAR
UNVENTED
DIRECT SINGLE COIL CYLINDER
Detail for the installation of a Solar Unvented Direct
cylinder.
GENERAL
When installing this product it is essential the overall
installation meets all current legislation including, in
particular, the high limit isolation requirements of Building
Regulation G3. This document is designed to assist in
achieving that aim.
WATER
The potable water connection and tundish discharge
connection are to be connected in exactly the manner
described in Pages 5 to 8 of this manual.
IMMERSION HEATERS
The standard issue immersion heaters are designed for
domestic usage where the lower heater is connected to a low
rate off-peak tariff and the upper heater used for occasional
top-up purposes. Heaters of this nature are not designed to
be permanently live. Connect in accordance with instructions
on page 6.
SOLAR CONNECTIONS
The flow and return from the solar heat source are to
be connected to the indirect 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 manufacturers 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 inserts into Pocket B (page 13) and is held in-situ
with the black sensor pocket retaining bung provided.
It is necessary to connect the solar pump via the over-
temperature high limit cut-out (provided) to ensure the heat
input to the solar coil is interupted if the cylinder over heats.
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 2 port
zone valve (not supplied) can be used with the pump and
high limit stat as shown on pages 14 and 15.
INDIRECT TWIN COIL CYLINDER
UPPER COIL
The upper coil is connected to the fossil fuel boiler as per
the instructions for the STAINLESS UV Unvented Indirect
single coil model with the dual stat control and high limit
thermostat inserted into pocket D (diagram page 13). The
wiring requirements are as depicted on page
15.
LOWER COIL: SOLAR INSTALLATION
The flow and return from the solar heat source are to
be connected to the indirect 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 manufacturers 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 inserts into Pocket B and is held in-situ with the
black sensor pocket retaining bung provided.
It is necessary to connect the solar pump via the over-
temperature 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 2 port zone valve (not supplied)
can be used with the pump and high limit stat as shown on
page 15.
NOTE: If it is intended to fit a cylinder with a solar coil to be
used at a later date, the 2 coils should be connected in series
to make use of the solar coil, using the dual stat in Pocket D
The Domestic Heating Compliance Guide document L1A
and L1B provides excellent advice in sizing both cylinder
designated solar areas and heat exchangers to the surface
area of the solar collectors. Using this guide Range are able
to offer sizing advice for specification.
NB: The total detail of compliance guide document should
be consulted prior to specifying product or commencing
design.
14
STAINLESS UV
UNVENTED HOT WATER CYLINDERS
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