gledhill TEC140-OV Installation & Servicing Instructions Manual page 21

S Plan Sealed Main Heating System
Auxiliary
heating
Max.
height
10m
Sealed
system kit
Y Plan Sealed Main Heating System
Auxiliary
heating
Max.
height
10m
Sealed
system kit
Min.
250mm
Min.
250mm
Page 21
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 fitted at a high level in the
same cupboard as the Torrent. However it can
be fitted 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 overflow/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 filling the heating
system even through a non-return valve
without the approval of the Local Water
Authority. An approved filling loop is required
for filling 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 ECO 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 ECO SP