gledhill StainlessLite D120 Design, Installation & Servicing Instructions page 18

INSTALLATION
Schematic Solar Direct System
Motorised Valve
Energy cut-out
(Not supplied)
Schematic Solar Indirect System
Motorised Valve
Energy cut-out
(Not supplied)
INSTALLATION
Solar Panel
Solar
Controller
Expansion
Vessel
Solar Pumping Station
Solar Panel
Motorised Valve Solar Pumping Station
Energy cut-out
(Not supplied)
Page 18
All components in a solar primary system must
be marked or identifiable in such a way that
their design pressure and temperature can be
readily determined.
A pressure and temperature relief valve to
control the risk of over-pressure in system
components should be fitted. A termination
from a pressure and temperature relief valve
should minimise the risk of damage to persons
or materials. Suitable locations are into a
high temperature receptacle, an internal
gully or externally at ground level. High level
termination from walls or on roofs could cause
injury to people or animals below if the valve
were to release scalding water and steam.
The pipe leading to the safety device and the
collector should be of rigid and non-deformable
construction, without any possibility of
restriction or disclosure by any other fitted
component.
A more detailed diagram of our recommended
arrangement for a typical solar system is shown
on page 20.
This provides all the necessary controls and
safety devices necessary for the solar system i.e.
the two port zone valve is wired as an energy
cut out and the pump/valve will only allow heat
transfer as required under control of the solar
controller.
The solar pocket provided accommodates an
8mm diameter sensor which, with the sensor
located in the solar collector (or in the flow
pipe immediately adjacent to the collector),
will provide the information required by the
solar controller.
Solar
Controller
Note: If the motorised valve is not used then
any factory built hydraulic station for solar
use MUST be fitted with suitable non-return
Expansion
valves in both flow and return pipes to
Vessel
prevent gravity circulation when the pump
is not running.
If there is a possibility of the solar controller that
you install causing the cylinder temperature to
exceed 80°C, under normal working conditions,
then a Solar tempering valve must be fitted to
the domestic hot water outlet of the cylinder.
This must limit the hot water temperature to a
maximum of 60°C.(ref building regulations part
G3 3.63). This product can be supplied from
Gledhill part number XC007 which has a inlet
temperature limit of 100°C. Suitable plumbing
configurations for installing this valve are
shown on page 19 of this manual. NB. Any fitted
Overheat thermostats may require resetting
in the winter months to enable backup heat
sources to heat the cylinder.