Page 16
Page 17
Lift Up Pressure & Temperature Relief Valve
This safety device is also pre-set at the factory and relieves before the temperature
reaches 100°C. It is also a Pressure Relief Valve, and is pre-set to 6 bar.
Immersion Heaters
The immersion heaters fitted to our units are 3kW 240V ~AC. Check that the mains
supply conforms to this, and all external wiring conforms to the most recent
revision of the IEE wiring regulations. An Incoloy element is used on this product for
standard domestic use and water conditions, use our Titanium elements in all other
circumstances, part number SH002.
The immersion heater is fitted into the hot water cylinder using an O-ring. After the
unit is filled with water check for leaks to determine if the O-ring has sealed and
tighten carefully using the appropriate tool. To prevent damage to the O ring do not
use excessive force to tighten the immersion heater.
The immersion heater is supplied with a thermostat which has been tested
for operation in the cylinder and complies with the European directives for
Electromagnetic compatibility and radio interference. It is Rated at 16 Amp 250V ~AC.
Immersion Heater Wiring
E
L
N
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
StainlessLite Plus 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 StainlessLite Plus 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. When wiring the supplied
components, 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.
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.
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
(Not supplied)
Motorised Valve
(Energy cut-out)
Gate Valve
(Not supplied)
Schematic Sealed Primary System
Boiler
Motorised Valve
(Energy cut-out)
Expansion
Vessel
Gauge
Safety Valve
Pump
Motorised Valve
(Not supplied)
Gate Valve
(Not supplied)
INSTALLATION
INSTALLATION
INSTALLATION
INSTALLATION
The immersion thermostat has two terminals
A and B. The Live (brown) wire should be
connected to terminal A and the Neutral (blue)
wire should be connected to terminal B. It has
been our experience that Crimp terminals make
better connections. The immersion heater must
be fully earthed (earth post) and connected via
a double pole isolator switch having a contact
separation at least 3mm, see diagram opposite.
Danger of electrocution: before making any
adjustments to the thermostat isolate the
immersion heater from the mains electricity
supply at the fuse spur unit.
The immersion heater thermostats incorporate
a manual reset safety/overheat cut out
thermostat. Should this operate, investigate
the cause before pressing the red reset button
labelled safety. If there is no apparent fault
adjust the control setting down slightly to
prevent nuisance tripping.
If another heat source is used to heat the
cylinder and this is allowed to raise the water
temperature excessively then the overheat
thermostat will trip. This is likely on solar
thermal products when the solar thermostats
are set at high temperatures.
The Direct cylinder is intended to be heated
from an off peak supply using the lowest
immersion heater(s) and boosted via the upper
immersion heater from an on peak supply.
Suitable controllers are available to control this
operation effectively.
Solar Thermistors / sensors
Care must be taken to ensure that the solar probes
are fully inserted into the pockets provided.
Important
Failure to follow the drain down procedure will
invalidate the warranty. (see page 22)
NEVER
drain the cylinder of hot water and
then close all cylinder inlets and
outlets.
REASON
as the air remaining in the cylinder
cools the pressure inside the
cylinder will fall below atmospheric
and cause damage to the cylinder.
NEVER
close the cold main and drain the
cylinder via any tap connected to it.
REASON
as the water drains, the pressure
inside the cylinder may decrease
below atmospheric and this may
cause damage to the cylinder.
In line with good plumbing practice, use of
excessive flux should be avoided.
I.V.
Combination Valve
I.V.
If two StainlessLite Plus cylinders are coupled together the secondary inlet and outlet
pipes must be balanced. The units must be fitted on the same level.
Note: No valves must be fitted between the expansion vessel and the storage cylinder(s).
Thermostat Type TSR fitted in the
Direct cylinders; is supplied set at
62°C ± 3°C. Position 4 is 55°C ± 3°C
and position 5 is 68°C ± 3°C.
Thermostat Type TSE fitted in the
indirect cylinders - is supplied set
in position 5 at 60°C ± 4°C.
When ordering a replacement
part the TSR thermostat type will
be supplied with the immersion
heater.
