13
EVERFLO STAINLESS UV
UNVENTED HOT WATER CYLINDERS
EVERFLO 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 o-peak
tari 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 ow and return from the solar heat source are to be
connected to the indirect coil. Either primary coil connection may
be utilised as the ow 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
dierential 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 11) 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 ow and return pipework would be
acceptable.
If solar controls do not oer appropriate isolation a 2 port zone
valve (not supplied) can be used with the pump and high limit stat
as shown on pages 13 and 14.
INDIRECT TWIN COIL CYLINDER
UPPER COIL
The upper coil is connected to the fossil fuel boiler as per the
instructions for the EVERFLO STAINLESS UV Unvented Indirect
single coil model with the dual stat control and high limit
thermostat inserted into pocket D (diagram page 12). The wiring
requirements are as depicted on page 14.
LOWER COIL: SOLAR INSTALLATION
The ow and return from the solar heat source are to be
connected to the indirect coil. Either primary coil connection may
be utilised as the ow 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
dierential 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 ow and return pipework would be
acceptable. If solar controls do not oer appropriate isolation a
2 port zone valve (not supplied) can be used with the pump and
high limit stat as shown on page 14.
NOTE: If it is intended to t 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 oer sizing advice
for specication.
NB: The total detail of compliance guide document should be
consulted prior to specifying product or commencing design.