Description - gledhill TORRENT DIRECT Design, Installation & Servicing Instructions

DESCRIPTION

Gledhill developed the principle of domestic thermal stores starting in 1982 and they have been
manufacturing them in ever larger numbers since then. They are particularly important to the
design of the systems in two main areas: -
(a) Apartments – Where the discharge from the pressure and temperature relief valves on the
unvented cylinders could be a problem. Because this product does not require a safety
discharge from a temperature and pressure relief valve, any installation will be easy to
incorporate into the building and will not suffer the problems facing unvented cylinders
now that discharges into PVCu soil stacks are not permitted.
(b) Alternative energy – Where a primary a thermal store can be heated by a solid fuel and/or
heat pump and or solar thermal system without the risk of legionella or the risks
associated with high temperature and pressures. The secondary water volume is so small
that the "dwell time" is tiny which is the reason why there is virtually no legionella risk
unlike a storage vessel.
Torrent range of primary thermal stores are designed to provide mains pressure hot water without
the additional safety requirements of a pressure and temperature relief valve. Therefore, unlike
with the unvented cylinder, the notification to the Building Control to comply with section G3 of
the Building Regulations is not required. This is because the thermal store is vented in the normal
way and the mains pressure hot water is heated instantaneously by means of heat exchangers
inside the thermal store as shown in figures 1.1 – 1.5. The domestic hot water heat exchanger
contains its own self replenishing expansion chamber to absorb the expansion of the domestic
hot water inside the appliance.
Unlike unvented storage cylinders, the Torrent range of mains pressure hot water units require no
annual maintenance or inspection. This reduces the running cost for the home owner while
offering high performance showers and high flow rates to fill baths rapidly.
The Torrent model selection guidance is summarised in table 2.1 and the Torrent range is
available in the following basic variants: -
1.1 TORRENT DIRECT
Torrent Direct is an electrically heated, fully packaged mains pressure hot water appliance which
incorporates a feed and expansion cistern as shown in figure 1.1. Therefore it eliminates the
problems associated with a cold water cistern in the roof space. It is supplied complete with two
low watts density immersion heaters for extra quiet operation which are BEAB approved for
safety.
A Torrent Direct-Solar model shown in figure 1.2, is also available for use with a solar thermal
water heating system. The technical data of the Torrent Direct models is listed in table 2.3 in
section 2.
1.2 TORRENT INDIRECT-OV
Torrent Indirect-OV shown in figure 1.3 is a vented primary thermal store that is designed for use
with either a gas or an oil boiler and it provides mains pressure domestic hot water. The primary
thermal store (i.e. the cylinder) of the Torrent Indirect-OV is heated directly by the boiler and
therefore it is only suitable for open vented heating systems.
The primary hot water in the Torrent Indirect-OV models is used for producing domestic hot water
and is also circulated through the central heating circuit for rapid heating of the dwelling.
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