Ariston ST 50 ProTech User guide

ti) ARISTON
Instructions for Installation,
Servicing and Use
Unvented Hot Water Storage
Cylinders
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Country of destination: GB/IE
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TABLE OF CONTENTS
1. THE BENCHMARK SCHEME Page 2
2. GENERAL INFORMATION Page 3
2.1 Guarantee Page 3
2,2. How the Appliance Works Page 3
2.3 Delivery Page 4
3. INSTALLATION Page 5
3.1 Water Regulations Page 5
3.2 Building Regulations Page 5
3.3 General Guidance Page 5
3.4 Cold Water Supply Page 5
3.6 Siting and Fixing Page 6
3.7 Overall Dimensions Page 7
3.8 Connection of Mains Supply Page 8
3.9 Cold Water Combination Valve Page 11
3.10 Connection to Services Page 14
3.11 Secondary Return Page 14
3.12 Discharge Pipework Page 14
3.13 Electrical Connection Page 17
3.14 Electrical Diagrams Page 19
4. COMMISSIONING Page 24
5. MAINTENANCE Page 26
5.1 ProTech Anti-corrosion System Page 26
5.2 Thermal Cut-out(s) Page 26
5.3 Immersion Heater(s) Page 26
5.4 Unvented Controls Page 26
5.5 Thermostats Page 27
5.6 Maintenance Page 27
6. FAULT FINDING Page 29
7. TECHNICAL INFORMATION Page 30
8. BENCHMARK COMMISSIONING CHECKLIST Page 34
9. BENCHMARK SERVICE RECORD Page 35
1- The Benchmark
Scheme
Benchmark places responsibilities on both manufacturers and installers.
The purpose is to ensure that customers are provided with the correct
equipment for their needs, that is installed, commissioned and serviced in
accordance with the manufacturer's instructions by competent persons and
that it meets the requirements of the appropriate Building Regulations. The
Benchmark Checklist can be used to demonstrate compliance with Building
Regulations and should be provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing
work in accordance with the Benchmark Code of Practice which is available
from the Heatinmg and Hotwater Industry Council who manage and promote
the Scheme. Visit vvww.centralheating.co.uk ^or more information.

2. GENERAL
INFORMATION
2.1 Guarantee
This manual is an integral and essential part of the product. It should be kept
with the appliance so that it can be consulted by the user and/or authorised
personnel.
Please read carefully the instructions and notices about the appliance
contained in this manual, as they provide important information regarding the
safe installation, use and maintenance of the cylinder.
Failure to do so may invalidate the guarantee.
When installing and servicing the cylinder, Ariston ThermoUK Ltd
recommend the use of protective clothing i.e. gloves.
The Ariston range of unvented cylinders come with Varying guarantees
depending on the model of cylinder. The guarantee periods offered with
each model of cylinder are as follows:
ST Range
Classico HE Range
Primo HE Range
10 Years tank
2 Years electrical components
5 Years tank
2 Years electrical components
25 Years tank
2 Years electrical components
Note: The guarantee is subject to the cylinder being installed and serviced
annually by a competent person as per the servicing instructions in Section
5.6 of this manual. For units with the ProTech anti-corrosion device it must
be ensured that this is connected and operating correctly (green LED only).
2.2 How THE Appliance
Works
The immersion heater(s) are controlled through a thermostat which senses
the water temperature. The operating temperature can be pre-set by
adjusting the spindle in the head of the thermostat. In addition to the
thermostat there is a thermal cut-out incorporated if the thermostat fails and
the water temperature rises too high. Once the cut-out operates it can only
be re-set manually after the fault has been rectified.
Indirect models have dual thermal controls. In addition to the above there is
a separate cylinder thermostat and thermal cut-out for controlling each
indirect circuit. Again the thermal cut-out operates if the cylinder thermostat
fails, by disconnecting the live feed (call for hot water) from the programmer.
ITI/ITD/ITSI models have a stainless steel tank and therefore need no
protection against corrosion.
STD/STI models have an enamelled steel tank and therefore are supplied
with magnesium anodes to prevent corrosion of the cylinder tank. It is
imperative that the top anode is checked during the annual service and if
found to be corroded both anodes should be replaced. Failure to do so
could invalidate the warranty of the tank.
i-. ^
The Wall-hung (ST) units utilise the ProTech anti-corrosion system
(electronic anode). This prevents an electrolytic reaction between the tank
and dissimilar metals. The ProTech system shows if it is operating correctly
(green LED) or incorrectly (red LED). In the event that the red LED lights
(even with the green light still showing), it is imperative that a service agent
is contacted immediately as continued use with the ProTech system in this
state could invalidate the warranty on the tiank.
The factory fitted temperature & pressure relief valve at the top of the
cylinder is a safety device to back-up the thermostat(s) and thermal cut-
out(s). It works by sensing an excess in water temperature or pressure and

releasing the hot water Into a discharge tundish and drain.
The cylinder will only work in the vertical position. The inlet pipe needs to
deliver cold water to the bottom of the tank. When water is heated it
expands. To accommodate this increase in volume an expansion vessel is
provided. A cold water combination valve is also provided in two pieces,
loose jointed for ease of installation. These comprise a combined line
strainer/pressure reducing valve and core non-return valve/expansion relief
valve.
2.3 Delivery Arlston range of Unvented Cylinders are available in the following
options:
The Wall-hung ProTech cylinder (100 litre model), which is supplied as
follows;
One box containing;
1) The cylinder with factory fitted temperature & pressure relief valve,
immersion heater and thermostat with thermal cut-out.
One box containing;
1) Unvented control pack (expansion vessel, 2 piece cold water combination
valve and tundish), instructions for installation, servicing and use
including the Benchrnark Log Book).
The STD and ST/floor standing range (125, 150, 200, 300 and 500 litre
models) and the ITD and ITI floor standing range (100*, 125,150, 200, 250*
and 300 litre models which are supplied as follows;
One box containing;
.1) The cylinder with factory fitted temperature & pressure relief valve,
immersion heater(s) and thermostat(s) with thermal cut-out(s), cylinder
thermostat with thermal cut-out (indirect only).
2) Unvented control pack (expansion vessel, 2 piece cold water combination
valve and tundish), motorised valve (indirect only, non-high temperature),
expansion vessel mounting bracket, instructions for installation, servicing
and use including the Benchmark Log Book.
The /TS/twin coil floor standing range (200, 250 and 300 litre models) are
supplied with the following;
One box containing;
1) The Cylinder with factory fitted temperature & pressure relief valve,
immersion heaters and thermostats with thermal cut-outs, cylinder
thermostats with thermal cut-outs.
2) Unvented control pack (expansion vessel, 2 piece cold water combination
valve and tundish), 2 x motorised valves (non-high temperature),
1 X elongated thermostat pocket (for solar applications), expansion vessel
mounting bracket, instructions for installation, servicing and use including
the Benchmark Log Book.
ITI only

3. INSTALLATION
3.1 Water Regulations
3.2 Building Regulations
3.3 General Guidance
The appliance should be installed in accordance with the Domestic Heating
Compliance Guide.
These regulations (byelaws in Scotland) ensure a good supply of
wholesome water, ahd that only approved materials, pipes and fittings are
used to convey water.
These are a statutory document and take priority over all other regulations
and recommendations. The installation of an unvented hot water storage
cylinder is classified as a "Controlled Service" and Regulation G3 applies. To
meet the requirements of the Regulation, installation of an unvented system
should be undertaken by a "competent installer".
All installations of unvented hot water storage systems having a capacity of
more than 15 litres should be notified to the relevant Local Authority by
rrieans of building notice or by the submission of full plans. It is important to
note that it is a criminal offense to install an unvented hot water storage
system without notifying the Local Authority. The installation of the unvented
cylinder and hot water system must comply with BS 6700 and the HSE
Legionella Code of Practice.
Current guidance notes do not cover the connection of a solar thermal
circuit to an unvented storage vessel (cylinder). However, if guidance is
sought for compliance with current regulations the fundamental principle is
to provide a failsafe means of shutting off the solar input to the heat
exchanger if the cylinder temperature should rise above the set temperature
of the cylinder's energy cut out. (See Note 1).
As with all unvented hot water systems, notification of intention to install
should be given to your local building control.
Option A. A non self resetting mechanical shut-off should be installed on
the solar primary flow to the cylinder. The mechanical shut-off should be
suitable for use with a solar primary circuit (i.e. high temperature and glycol
resistant). The mechanical shut-off should be integrated electrically with the
cylinder energy cut out/s and if necessary the solar circuit temperature
control, please refer to the solar controller manufacturer for further
information.
Option B. Where the solar controller and hydraulic system demonstrate that
by no lesser means the requirement in Option A is satisfied by other means;
certification by an approvals body is required to demonstrate that in the
event of the stored water going over temperature, the heat input to the
cylinder is isolated by physical means and Is non self resetting.
These systems should be clearly identified with reference to the approvals
body. (See Note 2)
Note 1 :Whilst most solar cylinders use a coil type heat exchanger other
options such as external plate to plate devices , external annulars or 'tank In
tank' systems may be used but the same control options always apply.
Note 2 :Current approved bodies include the British Board of Agrement
(BBA), WRc-NSF Limited, or KIWA
3.4 Cold Water Supply
The strainer prevents any debris entering the other controls. The pressure
reducer ensures the correct operation of the expansion vessel, and prevents
any damage to the control valves through too great a pressure.
The non-return valve ensures the water expansion is forced into the
expansion vessel and prevents contamination of the mains cold water
supply. The expansion relief valve will discharge expanded water to the
discharge tundish if the expansion vessel fails.
It is important to ensure that the cold water main is capable of supplying the
increased demand which will be imposed on it. Hot and cold water are both
drawn off the same source of supply. Remember, there will not be a storage
tank to help compensate for variations in the demand on thasystem.

3.6 Siting and Fixing
A minimum dynamic pressure of 1.5 bar or 20 litres per minute is required
for satisfactory operation. 85% of UK dwellings have a mains pressure
above 2.0 bar.
Note: THE MAINS WATER SUPPLY MUST NOT EXCEED 16 BAR.
The cylinder should be left packed until it is time to install. When unpacking
the appliance follow the guidelines within the packaging and take care not to
damage the temperature and pressure relief valve.
The cylinder may be installed in any convenient position. As it is connected
to the mains cold water supply. Consideration must be given to allow ease
of access for maintenance purposes.
Additionally, do not install the unit in premises which may be subject to
freezing.
Ensure that the floor load bearing strength is adequate to take the weight of
the cylinder when full of water (see Table 1). e.g. Do not install the cylinder
on floors made of chipboard or other flooring where the mechanical strength
is compromised when damp.
The ST50, ST80 and ST100 ProTech models are wall mounted. All other
models are free standing. These are supplied with feet which are attached
to the heater via self-tapping screws which are also supplied.
All units must be installed in the VERTICAL POSITION.
For maintenance purposes leave at least 500 mm free space in front of the
unit, for access.
Important: In the event that the installation of this cylinder wll require a third
sensor to be fitted (i.e. Solar) the following actions will be necessary:
Replace one of the thermostat pockets supplied with the indirect
thermostats in the Unvented Kit with the elongated thermostat pocket also
supplied.
This thermostat and pocket must now be fitted to the top thermostat
connection.
Please also refer to Section 2.3 General Guidance Options A and 8 (page
5) of this manual.
For further technical advice, please contact the Ariston Technical Advice
Line on 0870 241 8180.

DIRECT RANGE
Wall'hung
ST 100 ProTech
Storage
Capacity
Units Pipe Size
Inlet Outlet
Coil
Surface
rrP
Floor Standing
ClassicoHESTDIZS
ClassicoHESTDISO
CtoHESTD 210
ClassicoHESTD300
ClassicoHESTDSOO
3/4" Male
3/4" Male
3/4" Male
3/4" Male
1" Male
ClassicoHESTI125
CtoHESTIISO
ClassicoHESTI210
QassicoHESTISOO
ClassicoHESTlSOO
3/4" Male
3/4" Male
3/4" Male
3/4" Male
1" Male

storage
Capacity
DIRECT RANGE
PRIMOHEfTD125
PRIMOHEITD150
PRIMOHEITD210
PRIMOHEITD300
lIMJiiSiiiaJM:
PRIM0HEIT11M
PRIMO HE 171125
PRIMOHEITI 150
PRIMOHEITI210
PRiMO HE 171250
PRiM0HEI7l 300
TWIN COIL RANGE
PRtMOHEI7S!210(topA)OltOfii)
PRIMO HE 1751250 (topAotlOffl)
PRiMOHEI7SI300(topMo!n)
Units Pipe Size
Inlet Outlet
3/4" Male
3/4" Male
3/4" Male
3/4" Male
3/4" Male
3/4' Male
3/4" Male
3/4" Male
3/4" Male
3/4" Male
Coil
Surface

3.8 Connection of Mains
Water Supply
For floor standing models:
On the front of the unit there is a label to identify the connection ports.
Please check this before making any connection to the unit.
For units up to 300 litres it is recommended that all mains cold water supply
pipe work is a minimum of 22mm, with the exception of model ST 50
ProTech where 15mm can be used. For 500 litre models the supply should
be 28mm. An isolating valve should be installed between the cold water
supply and the cylinder for servicing. ALL PIPEWORK MUST BE FLUSHED
TO AVOID DAMAGE TOTHE CONTROL VALVES.
Please refer to Figs. 3.1 - 3.7 for a suggested installation layout.
Draining taps must be located in acessible postions to permit the draining of
the whole cylinder. The taps must be a minimal size of at least 15mm
nominal size (preferably 22mm), and manufactured in accordance with BS
2879:1980.
When installing the expansion vessel it can either be connected directly to
the combination valve (see Figs 3.8 - 3.10), or it can be installed remotely
using the flexible hose supplied.
Important Note:-
When installing the expansion vessel, do not install the expansion vessel
vertically as air can become trapped in the expansion vessel resulting in
potential vibrations through the cylinder and pipework. When using the
flexible hose to remotely install the expansion vessel away from the control
valve, again, ensure that the vessel is not installed in a vertical position
where it can trap air.
See below for acceptable installation practices.
A □□

ST ProTech 100
STD 125-150-210-300 Direct
ITD 125-150-210-300 Direct
PRESSURE » TEMPERATURE
RELIEF VALVE
COMBINATIOM
VALVE
EXPANSION
VESSEL V
EXPANSION
RELIEF
HOT SUPPLY
22inm
''■ WW.
■o:\0i?d
Tl 125-150-210-300 Indirect
10-125-150-210-250-300 Indirect
SECONDARY
RETURN ■
MAX. tOOmm
I
Note: Flow and Return pipes may be connectei
TO THAT SHOWN IN THE DIAGRAMS FOR INDIRECT CYL