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

EXMNSlON RELIEF ZONE
PIPE VALVE
SECONDARY
RETURN ^

Cold Water
Combination Valve
The cold water combination valve may be fitted in close proximity to the
cylinder, or alternatively, it may be separated to allow the pressure reducing
valve where the mains supply enters the property allowing for balanced cold
water throughout the whole property whilst the 6 bar safety valve is fitted in
close proximity to the cylinder.
A balancing port is supplied on the 22mm and 28mm valves allowing
balanced cold water supply to the rest of the building giving constant results
for mixer and shower valves. If the facility is not needed a plug is supplied.
Refer to Fig. 3.8 and Fig. 3.9
Note!
There should be no other valves fitted between the cylinder and the
EXPANSION valve.

3/4" B.S.P. CONNECTION
FOR EXPANSION VESSEL
22mm COLD
MAINS IN
SERVICEABLE 3/4" PRESSURE REDUCING
CARTRIDGE AND LINE STRAINER
(SET AT 3.5 BAR)
22mm TO WATER HEATER
22mm COLD
MAINS IN '
15mm EXPANSION RELIEF
OUTLET TO TUNDISH
EXPANSION RELIEF VALVE
(SET AT 6 BAR)
Important Note!
The connecting nut used on
this water group Is of an
eccentric design. The offset
hole is not a manufacturing
defect.
22mm TO CYLINDER
NON-RETURN VALVE
(WITHIN HOUSING)
22mm BALANCED COLD WATER TAKE OFF
. WITH NON-RETURN VALVE
For ST 100, Prime HE ITD, III, ITSI,
Classico HE SID and STI models up to 3001
SERVICEABLE 1" PRESSURE REDUCING
CARTRIDGE AND LINE STRAINER
(SET AT 3.5 BAR)
EXPANSION RELIEF VALVE
(SET AT 6 BAR)
28mm TO
CYLINDER
3/4" B.S.P CONNECTION
FOR EXPANSION VESSEL
r BALANCED COLD WATER TAKE OFF
WITH NON-RETURN VALVE
For Classico HE STD and
STI 500 models

3.10 Connection TO Services
It is recommended that a 22mm pipe run should supply the outlets
throughout the building, especially to baths and showers. Short runs of
15mm pipe may be used to connect basins and sinks.
3.11 Secondary Return
On floor-standing models a secondary return may be fitted (consult the label
on the face of the unit for the correct location). A non-return valve (not
supplied) must be fitted to prevent back flow and a bronze pump will be
needed in conjunction with a pipe thermostat and timer to circulate the hot
water (both not supplied).
Note: an extra expansion vessel may be required where the additional
volume of the secondary return exceeds the capacity of the expansion
vessel supplied.
3.12 Discharge Pipework
Note!
The safety relief valves must not be used for any other purpose
1) Discharge pipes from the temperature & pressure relief and expansion
relief valve may be joined together.
2) The tundish must be vertical and fitted within 500mm of the temperature
& pressure relief valve and must be located with the cylinder but away
from any electrical devices. The tundish must also be In a position visible
to the occupants, and positioned away from any electrical devices. The
discharge pipe from the tundish should of metal and terminate in a safe
place where there Is no risk to persons in the vicinity of the discharge.
3) The pipe diameter must be at least one pipe size larger than the nominal
outlet size of the safety device unless it's total equivalent hydraulic
resistance exceeds that of a straight pipe 9m long.
i.e. Discharge pipes between 9m and 18m equivalent resistance length
should be at least 2 sizes larger than the nominal outlet size of the safety
device. Between 18m and 27m at least 3 larger, and so on.
Bends must be taken into account in calculating the flow resistance.
See Fig. 3.10 and Table 2.
4) The discharge pipe must have a vertical section of pipe at least 300mm
in length below the tundish, before any elbows or bends in the pipework.
5) The discharge pipe must be installed with a continuous fall and should be
at least one pipe diameter clear of the wall where It terminates.
6) The discharge should be visible at both the tundish and the final point of
discharge, but Where this is not possible or practically difficult; there
should be clear visibility at one or other of these locations. Examples of
acceptance are: .
i) Ideally below a fixed grating and above the water seal in a
trapped gully.
ii) Downward discharges at a low level; i.e. up to 100mm above
external surfaces such as car parks, hard standings, grassed
areas etc. These are acceptable providing that where children
may play or otherwise come into contact with discharges, a wire
cage or similar guard is positioned to prevent contact, whilst
maintaining visibility.
iii) Discharges at high level; Onto a roof capable of withstanding high
temperature discharges of water 3m from any plastic guttering
systems that would collect such a discharge (tundisb visible).
iv) Where a single pipe serves a number of discharges, such as in
blocks of flats, i.e. into a metal hopper and metal down pipe with
the end of the discharge pipe clearly visible (tundish visible or
not), the number served should be limited to not more than 6
systems so that any installation can be traced reasonably easily.
14
^

The single common discharge pipe should be at least one pipe
size large than the largest individual discharge pipe to be
connected. If unvented hot water storage systems are installed
where discharges from safety devices may not be apparent i.e. in
dwellings occupied by the blind, infirm or disabled people,
consideration should be given to the installation of an
electronically operated device to warn when discharge takes
place.
Note: The discharge will consist of scalding water and steam.
Asphalt, roofing felt and non-metallic rainwater goods may be
damaged by such discharges.
Temperature & pressure
relief valve
Metal discharge pipe (D1) from
temperature & pressure relief valve,
to tundlsh.
Tundish
500mm Max
300mm
MIn
Metal discharge pipe (D2) from tundlsh
with continuous fall. See Table 2 and worked
example.
Discharge below
fixed grating,
(see page 10 for
alternative points
of discharge).
Fixed grating
Fig. 3.10
Trapped gulley
Table 2. Sizing of copper discharge pipe "D2" for common temperature valve outlet sizes.
Valve outlet size
Minimum size of
discharge pipe D1*
Minimum size of
discharge pipe D2*.
from tundlsh
Maximum
resistance allowed,
expressed as a
length of pipe (i.e.
no elbow or bends)
Resistance created
by each elbow or
bend
G 1/2
15mm 22mm
28mm
35mm
Up to 9m
Up to 18m
Up to 27m
0.8m
1.0m
1.4m
G3/4
22mm 28mm
35mm
42mm
Up to 9m
Up to 18m
Up to 27m
1.0m
1.4m
V 1.7m
G 1
28mm 35mm
42mm
54mm
Up to 9m
Up to 18m
Up to 27m
1.4m
1.7m
2.3m
15

WORKED EXAMPLE
The example below Is for a G1/2 temperature & pressure relief valve with a
discharge pipe (D2) having 4 no. elbows and length of 7m from the tundish
to the point of discharge.
From Table 2;
Maximum resistance allowed for a straight length of 22mm copper discharge
pipe (D2) from G1/2 temperature & pressure valve is 9m. Subtract the
resistance for 4 no. 22mm elbows at 0.8m each = 3.2m. Therefore the
maximum permitted length equates to: 5.8m. As 5.8m is less than the actual
length of 7m therefore calculate the next largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from
G1/2 temperature & pressure valve equates to: 18m. Subtract the resistance
for 4 no. 28mm elbow at 1 .Cm each = 4m. Therefore the maximum permitted
length equates to: 14m
As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.
WARNINGS
The outlet from the temperature & pressure relief valve must not be used for
any other purpose. This also applies to the expansion relief valve. No other
valve is to be fitted between the cold water combination valve and the
cylinder.
The temperature & pressure relief valve must not be removed in any
circumstances. Any of the above will totally invalidate the guarantee.

3.13 Electrical
Connection
The electrical installation must be In accordance with the current I.E.E.
wiring regulations.
PROTECH ELECTRONIC ANTI-CORROSION SYSTEM (ST 100 models
only)
Important: The ProTech anti-corrosion system MUST be permanently
connected to a fused non-switched 240V electricity supply see Fig 3.11.
Anode circuit
! O O
1
Electronic anode
Fig. 3.11
The ProTech. system, an exclusive solution, is an electronic anti-corrosion
protection system which ensures maximum longevity of the appliance,
regardless of water quality. The electronic circuit creates a difference in
potential between the hot water tank and the titanium electrode, thereby
guaranteeing optimum protection of the tank and preventing corrosion.
To ensure the proper operation of the protection system, IT MUST BE
PERMANENTLY CONNECTED TO A FUSED NON-SWITCHED 240V, 3A
ELECTRICITY SUPPLY even in the event of shut-down of the system. To
prevent risk to the appliance's lifespan when disconnecting the protection
system for an extended period of time, it is necessary to drain the appliance
beforehand.
In addition to the 240V network, the electronic circuit is also connected to
the tank, which is to be protected, and to the titanium protection electrode,
INFORMATION FOR THE END USER
Proper operation of the protection system is shown by a continuous green
L.E.D, indicating that the circuits terminals are being supplied with electricity.
In the event of failure, a red L.E.D. indicates that there is a short-circuit
between the electrode and the cylinder tank, that one of the leads (tank or
electrode) is disconnected or that there is no water in the cylinder.
Your appliance Is thus properly protected when the green L.E.D. is
illuminated and the red L.E.D. Is off. Should this not be the case, please
contact your installer.

DIRECT SYSTEMS
A mains supply of 240V, 3kW (13 amps) Is required. Heat resistant cable,
round 3 or 4 core 2.5mm^ {to BS6141 table 8) must be used to connect the
electrical supply through the Economy 7 time control switch using either
system 'A' or 'B' as illustrated in Fig. 3.12.
ECONOIY 7
CONTROLLER
SYSTEM A
PtG. 3.12
irPER a£»CHT
JDAYTIME TOP UPl
LOtCR ELOCNT
tHIGHT STQR£>
M.L HOURS
SUPPLY
tlal
SYSTEM B
LOCR ELOCMT
ST9E)
i

3.14 Electrical Diagrams
Should the Economy 7 system not to be used, a separate 13 amp supply to
each element will be required through a double pole fused isolating switch
having a contact gap of at least 3mm on each pole.The immersion heater
shall be installed with 85°C rubber insulated HOFR-sheathed flexible cable
complying with Table 8 of BS 6141: 1991. Make the connection{s) to the
immersion heater(s) as per Fig. 3.13 and Fig. 3.14. For High Capacity 500
litre models see Fig. 3.15 (page 20).
Single Element
THERMAL
CUT-GLrr
THERMOSTAT
ELEMENT
Fig. 3.13
LI 0
N 0
THERMAL
CUT-OUT
THERMOSTAT
DAY ELEMENT
3kW 240V~
THERMAL
CUT-OUT
THERMOSTAT
N 0
NIGHT ELEMENT
3kW 240V~
ECONOMY?
Fig. 3.14

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SINGLE
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WIRING
INSTRUCTIONS
FOR
6KW
IMMERSION
HEATER
Neutral
Live
Supply
from
common
fused
si
spur
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6
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2
Terminals
5
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Neutrals
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