Page 15
INST
ALL
A
T
ION
INSTALLATION
Heating/primary Systems
The boiler and primary/heating systems should
be sized and installed in accordance with BS
5449.
Safety
Stainless Lite is fitted with a Combined
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 fi tted 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 fi tted 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 fi tted with
an F&E Cistern.
Schematic Open Vented Primary System
Boiler
Pump
150mm max.
Warming/Overflow
Pipe
F & E Cistern
Minimum
distance as
required by
boiler
manufacturers
instructions
Motorised Valve
Motorised Valve
(Energy cut-out)
Schematic Sealed Primary System
Boiler
Motorised Valve
Motorised Valve
(Energy cut-out)
Expansion
Vessel
Gauge
Safety Valve
Pump
Summary of Contents for Stainless Lite Direct 90-300 litres
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