gledhill Torrent GreenHeat TGH140-OV Design, Installation & Servicing Instructions page 23

HP SOL Model With Central Heating From Heat Pump
Solar pumping station
Pressure Expansion
relief vessel
3-port
diverter
valve
PRV
HP SOL Model With Central Heating From Thermal Store
Solar pumping station
Pressure Expansion
relief vessel
PRV
INSTALLATION
Solar
controller
Min. 250mm
Solar
controller
Min. 250mm
TORRENT GREENHEAT HP SOL
Page 23
Torrent GreenHeat HP-Solar Models
The heat pump and space heating system
confi gurations and operation with the Torrent
GreenHeat HP-solar models is the same as for
standard models. The solar thermal system
operates independent of the heat pump system.
A typical generic solar system confi guration is
shown for guidance only. The solar system and
the associated controls should be planned and
installed following manufacturers instructions.
All components in the solar primary system
must be marked or identifi able in such a way
that their design pressure and temperature can
be readily determined.
A safety device i.e. pressure relief valve to
control the risk of over-pressure in the system
components should be fi tted as per solar system
manufacturers instructions. A termination from
the pressure relief valve should minimise the
risk of damage to persons or materials. Suitable
locations are a high temperature receptacle,
internal gully or else externally at ground level.
High level termination from a wall or on a roof
could cause injury to people or animals below
if the valve were to release scalding water and
steam.
The pipe leading to from the safety device to the
collector should be rigid and non-deformable
construction, without any possibility of
restriction, distortion or closure by any other
fi tted component.
A typical wiring diagram for the solar thermal
system for the Torrent GreenHeat HP-solar is
shown on page 35.
It is advisable that an overheat thermostat is
fi tted to limit the store temperature exceeding
85°C from solar gains during stagnant
conditions.
The control packages supplied with the heat
pump can not only control the heat pump but
any backup devices as well, for example, solar
thermal, gas boiler and immersion heater fl ow
boilers.