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HEATING SYSTEM DESIGN
T
ORRENT DIRECT AND
T
ORRENT RE SOL
AR
4.4
TORRENT INDIRECT & TORRENT RE-Solar HEATING SYSTEM DESIGN
4.4.1 General
(a)
The open vented i.e. the ‘OV’ models of the Torrent Indirect and the Torrent-RE are only
suitable for open vented heating systems. The sealed primary i.e. the ‘SP’ models of the
Torrent Indirect and the Torrent-RE are generally used for sealed primary (i.e. closed
heating) systems. However in both cases, the thermal store must always be open vented.
(b)
No valve shall be fitted in the safety open vent and which must be a minimum of 22mm
copper or equivalent.
(c)
The boiler must be set to operate at nominal 82
o
C flow which usually corresponds to the
maximum boiler control thermostat setting.
(d)
All Torrent models are designed to be installed with condensing or non condensing oil or
gas boiler which is capable of delivering hot water at a minimum temperature of 80
o
C.
(e)
It is recommended that where the central heating is supplied from the boiler circuit (e.g.
Torrent Indirect SP models), an automatic bypass is fitted to compensate for pressure and
hence the flow rate changes in the heating circuit e.g. when a thermostatic radiator valve
closes. The bypass valve must be set by the installer to suit the system i.e. to provide
minimum flow rate required for the boiler when all TRVs are closed.
(f)
It is important to ensure that both the primary store and the heating system are filled and
vented before switching on the boiler and the immersion heater (if fitted).
(g)
If the Torrent is heated directly by the boiler (e.g. the OV models), then the boiler (or
system pump) must be fitted in the return pipe from the store to the boiler. However if the
Torrent is heated indirectly by the boiler via a heat exchanger (e.g. the SP models), then
the boiler/system pump must be fitted in the flow pipe from the boiler to the store.
(h)
If the central heating is supplied directly from the store (e.g. the under-floor heating circuit
in Torrent RE-Solar), then the central heating pump must be fitted in the flow pipe from the
store to the heating circuit.
(i)
The Torrent models are supplied with an F&E cistern which is suitable for typical heating
installations. If other heat sources are added or underfloor heating is used, then the F&E
cistern should be upgraded to a larger one.
4.4.2 Pipe sizing and materials – heating system
(a)
All the recommendations with regard to the heating system in this manual are generally
based on BS/EN Standard copper pipework and fittings. However, plastic pipework can be
used in place of copper as long as the: -
The chosen system is recommended for use in domestic heating systems by the
manufacturers and it is installed fully in accordance with their recommendations.
The design criterion of the plastic system is at least equivalent to the use of BS/EN
Standard copper pipework and fittings
A barrier pipework is used.
The use of plastic pipework for the boiler flow and return circuit adjacent to the boiler
is done in accordance with the boiler manufacturers instructions.
Summary of Contents for TORRENT COMBI-PREHEAT
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