gledhill Torrent GreenHeat OV TGH140 Design, Installation & Servicing Instructions page 11

INSTALLATION
S Plan Open Vented Heating System
Min. 250mm
Auxiliary
central heating
Max.
height
10m
Y Plan Open Vented Heating System
Min. 250mm
Auxiliary
central heating
Max.
height
10m
TORRENT GREENHEAT OV
The two diagrams shown on this page show
how an 'S' plan and 'Y' plan may be used in
conjunction with the Torrent GreenHeat OV,
with another space heating supply being taken
direct from the store. The type of space heating
used is the installer's choice and the diagrams
only show possible layouts.
The auto bypass is positioned here to allow
minimum flow rates through the boiler as
TRVs close; and to allow for boilers with pump
overrun.
Off delay timers may be considered for use
in situations where the boiler pump overrun
is controlled by sensing a temperature drop
before shutting off. This type of boiler may
cause the pump to run on for some minutes
while the temperature slowly drops, but the
store temperature may also drop causing the
boiler to re again; the boiler then short cycles.
If an o delay timer is used it allows the pump
to overrun for about a minute to remove any
excess heat; then shuts o the pump, but it does
not remove so much of the heat from the store
that it causes the boiler to re again.
A solid fuel boiler is also able to be connected to
the Torrent GreenHeat OV, please refer to page
20 for further information.
Page 20
S Plan Sealed Main Heating System
Min.
250mm
Auxiliary
heating
Max.
height
10m
Sealed
system kit
Y Plan Sealed Main Heating System
Min.
250mm
Auxiliary
heating
Max.
height
10m
Sealed
system kit
INSTALLATION
Sealed heating system
All Torrent SP models are suitable for sealed
heating systems up to 3.5 bar maximum
operating pressure, however the normal
pressure relief valve setting is 3.0 bar. The typical
layout of the open vented 'Y Plan' and 'S Plan'
for the indirect Torrent models is shown in the
diagrams on this page.
A boiler used in a sealed heating system must
be suitable for this application i.e. it must be
fitted with an overheat cut-out thermostat
and can be located above the thermal store
F&E tank, as can the central heating system
connected to the boiler.
It is recommended that the F&E tank (for the
thermal store) is tted at a high level in the
same cupboard as the Torrent. However it can
be tted remotely up to 10m above the base
of the Torrent, and sized to accomodate the
expansion of the cylinder and any attached
central heating and solid fuel volumes.
The F&E tank over ow/warning pipe should
be installed in a material suitable for a heating
system feed and expansion tank.
There shall be no permanent connection to
the mains water supply for lling the heating
system even through a non-return valve
without the approval of the Local Water
Authority. An approved lling loop is required
for lling the heating system, which should be
disconnected after commissioning the system.
The filling loop should be located adjacent
to the boiler along with a suitable expansion
vessel, pressure gauge, pressure relief valve and
discharge arrangement.
The minimum system pressure should not be
less than the static head plus 0.5 bar i.e. the
height of the highest point in the system above
the expansion vessel plus a margin of 0.5 bar.
A solid fuel boiler is also able to be connected to
the Torrent GreenHeat SP, please refer to page
20 for further information.
Where a sealed primary coil is used, the thermal
store is a hot water only thermal store. If too
much heat is taken out of store, then hot water
performance will be limited. The hot water priority
should be protected by use of an appropriate
thermostat. Heating can be taken from the SP
thermal store to provide auxilliary heating to
towel radiators, which are low output. It is not
suitable for full central heating systems, this
should be taken directly from the boiler.
TORRENT GREENHEAT SP
Page 21