gledhill StainlessLite D120 Design, Installation & Servicing Instructions page 17

Schematic Open Vented Primary System
Warming/Overflow
Pipe
Minimum
distance as
required by
boiler
manufacturers (Not supplied)
instructions
150mm max.
Boiler
Schematic Sealed Primary System
Gate Valve
(Not supplied)
Expansion
Vessel
Safety Valve
Boiler
F & E Cistern
Motorised Valve
(Energy cut-out)
Gate Valve
Motorised Valve
(Not supplied)
Pump
Motorised Valve
(Energy cut-out)
Gauge
Motorised Valve
(Not supplied)
Pump
INSTALLATION
Heating/primary Systems
The boiler and primary/heating systems should
be sized and installed in accordance with BS
EN 12828:2003, BS EN 12831:2003 & BS EN
14336:2004.
Safety
Stainless Lite is fitted with a Combined Lift
Up Temperature/Pressure Relief Valve to cope
with any increase in system temperature and
pressure above the design limitations, when
used with boilers up to 45kW output, which is the
maximum allowed by section G3 of the Building
Regulations. The primary water temperatures
should be controlled as outlined below.
Primary Circuit
It is essential that the circuit between the boiler
and the Stainless Lite is pumped. The motorised
zone valve supplied should be fitted adjacent
to the unit and controlled by the cylinder
thermostat supplied. The thermostat and
motorised valve must be wired so that they both
switch off should an overheat situation develop.
It is important to follow the wiring diagram in
the Wiring Section of these instructions.
Sealed Primary Circuit
Any boiler used must be fitted with an over
temperature cut-out. Unvented primary circuits
may be filled or replenished by means of a
temporary connection between the circuit and
a supply pipe provided a 'Listed' double check
valve or some other no less effective backflow
prevention device is permanently connected
at the inlet to the circuit and the temporary
connection is removed after use.
Alternatively, a CA device can be used, which
will allow the system to be permanently
connected to the cold mains supply. The
primary system can then be topped up, when
required, in the same way as an open vented
system fitted with an F&E Cistern.
Gate Valve
All our cylinders are tested to BS EN 12897 at
15 l/mim at which they exceed the minimum
requirements for heat up performance and reheat
in less time than the maximum reheat times.
In extreme situations where excessive flow
rates, above 25 l/min are present, then a gate
valve on the return from the cylinder to the
boiler, before it joins the central heating return,
may be required to reduce excessive flow rates
and therefore any potential noise problems.
Page 17
INSTALLATION