Ariston Unvented Hot Water Storage Cylinders User Manual

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Unvented Hot

Water Storage

Cylinders

Instructions for Installation,
Servicing and Use

LEAVE THESE INSTRUCTIONS WITH THE
END-USER

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Countr

y of destination:

GB/IE

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TABLE OF CONTENTS 1. GENERAL INFORMATION

1.1 DELIVERY

2. INSTALLATION

2.1 WATER REGULATIONS

2.2 BUILDING REGULATIONS

2.3 HOW THE APPLIANCE WORKS

2.4 OVERALL DIMENSIONS

2.5 COLD WATER SUPPLY

2.6 SITING AND FIXING

2.7 CONNECTION OF MAINS WATER SUPPLY

2.8 COLD WATER COMBINATION VALVE

2.9 CONNECTION TO SERVICES

2.10 SECONDARY RETURN

2.11 DISCHARGE PIPEWORK

2.12 ELECTRICAL DIAGRAMS

3. COMMISSIONING

4. MAINTENANCE

4.1 PROTECH ANTI-CORROSION SYSTEM

4.2 THERMAL CUT-OUT(S)

4.3 IMMERSION HEATER(S)

4.4 U

4.5 THERMOSTATS

4.6 MAINTENANCE

NVENTED CONTROLS

5. FAULT FINDING

6. TECHNICAL INFORMATION

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1. GENERAL
INFORMATION

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 our authorised
personnel.

1.2 DELIVERY

Please read carefully the instr
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.

The Ariston range is available in the following options:

The

Wall-hung ProTech range (50, 75, 100 litre models), which are 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 bo

1) Unvented control pack (expansion vessel, 2 piece cold water combination

The Contract ProTech floor-standing range (100, 125, 150, 200 and 300 litre
models), which are supplied as follows;

One box containing;

1) The cylinder with factory fitted temperature & pressure relief valve.

x containing;

valve and tundish), instructions for installation, servicing and use and the
Benchmar

k Log Book).

uctions and notices about the appliance

One box containing;

1) Unvented control pack (expansion vessel, 2 piece cold water combination
valve and tundish), motorised valve (indirect only). Immersion heater(s)
and thermostat(s) with thermal cut-out(s), cylinder thermostat with
thermal cut-out (indirect only), feet (x3), instructions for installation,
servicing and use and the Benchmark Log Book.

High Capacity ProTech floor-standing range (500 litre models), which

The
are supplied as follows;

One box containing;

The cylinder with factory fitted temperature & pressure relief valve.

1)

1) Unvented control pack (expansion vessel, 2 piece cold water combination

e (indirect only). Immersion heater(s)

alv

e and tundish), motor

alv

v
and thermostat(s) with thermal cut-out(s), cylinder thermostat with
thermal cut-out (indirect only), feet (x 3), instructions for installation,
servicing and use and the Benchmark Log Book.

The

Classico and Primo floor-standing ranges (125, 150, 200 and 300 litre

models).

Are supplied with the f

One bo

1) The cylinder with factory fitted temperature & pressure relief valve.

x containing;

ollo

ised v

wing;

One bo

1) Unvented control pack (expansion vessel, 2 piece cold water combination

x containing;

valve and tundish), motorised valve (indirect only). Immersion heater(s)
and ther
ther
servicing and use and the Benchmark Log Book.

mostat(s)

mal cut-out (indirect only), f

with ther

mal cut-out(s), cylinder ther

eet (x3), instr

uctions for installation,

mostat with

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2. INSTALLATION

2.1 WA

TER

REGULA

TIONS

2.2 BUILDING REGULATIONS

2.3 HOW THE APPLIANCE
WORKS

These regulations (byelaws in Scotland) ensure a good supply of
wholesome water, and 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
means 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.

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 the 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.

Classico (STD/STI) models have magnesium anodes provided to prevent
corrosion of the cylinder tank.

High Capacity (STD/STI) 500 litre models, Wall-hung (ST) units and the

All
Contract (STD/STI) Floor-standing models utilise the ProTech anti-corrosion
system (electronic anode).

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 cut­out(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.
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

xpansion v

e
supply
discharge tundish if the e

essel and pre

The e

.

xpansion relief v

ents contamination of the mains cold w

v

e will discharge e

alv

xpansion vessel fails.

xpanded w

ater to the

ater

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2.4 OVERALL DIMENSIONS

TABLE 1

Model Storage Units Pipe Size Coil Dimensions in mm Weight

Capacity Inlet Outlet m

DIRECT RANGE

Wall-hung

ST 50
ST 80

ST 100

Floor Standing

STD ProTech
STD / STD ProTech / ITD 125
STD / STD ProTech / ITD 150
STD / STD ProTech / ITD 210
STD / STD ProTech / ITD 300

500 STD ProTech

INDIRECT RANGE

STI / STI ProTech / ITI 125
STI / STI ProTech / ITI 150
STI / STI ProTech / ITI 210
STI / STI ProTech / ITI 300

500 STI ProTech

*ITD Models **ITI Models

ech

ST ProT

50-80-100

50 l
75 l

100 l

100 l
125 l
150 l
200 l
300 l
495 l

125 l
150 l
200 l
300 l
495 l

1/2”
3/4”
3/4”

3/4”
3/4”
3/4”
3/4”
3/4"

1”

3/4”
3/4”
3/4”
3/4”

1"

STD/STD ProT

125-150-200-300

Surface When Full

2

ABCDEFGH Kg

ech/ITD

-

-

-

-

-

-

-

-

-

0.75

0.9

0.9

0.9

1.5

410
590
550

530
700
840

990
1215
1390

700

840

990
1215
1390

STI/STI ProT

125-150-200-300

120
175
175

650
805

965
1280
1555

335

805

965
1280
1555

335

1045
1205
1525
1790
1870

1045
1205
1525
1790
1870

ech/ITI

580
740
700

890

160
230
230

-

-

-

-

-

-

675
815
815
815
700

475

460

475

460

575

560

-

505

-

505

-

505

-

505

-

560

-

714

-

505

-

505

-

505

-

560

-

714

500 STD ProT

500 STI ProT

ech

ech

265
265
265
265
275

265
265
265
275

225
225
225
225
255

225
225
225
255

77
115
141

129

158/138*
190/164*
245/220*
385/331*

630

166/143**
201/171**
256/227**
395/337**

641

2.5 COLD WATER SUPPLY

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 w

ater 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 the system.
A minim

um pressure of appro

required f

or satisf

actor

ximately 1.5 bar and 20 litres per min

y oper

85% of UK dw

ation.

ellings ha

ve a mains

pressure above 2.0 bar.

Y MUST NOT EXCEED 16 BAR.

ed until it is time to install.

k

When unpacking

2.6 SITING AND FIXING

TER SUPPL

A

NOTE:

THE MAINS

W

The cylinder should be left pac
the appliance follow the guidelines within the packaging and take care not to
damage the temperature and pressure relief valve.
The cylinder ma

y be installed at any convenient position, as it is connected
to the mains cold water supply, it is equally effective on any floor, however,
consideration must be given to allow ease of access for maintenance
purposes.

ver, do not install the unit in premises which may be subject to

e

w

Ho
freezing. Ensure that the floor load bearing strength is adequate to take the
weight of the cylinder when full of water (see
The ST50, ST80 and ST100 ProT

ech

TABLE 1).

models are w

all 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

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unit, for access.

ute is

5

SECONDARY

RETURN

COMBINATION
V

ALVE

EXPANSION RELIEF

PIPE

COLD

M

AINS-IN
22mm

DRAIN

E

XPANSION

VESSEL

PRESSURE + TEMPERATURE
RELIEF VALVE

HOT SUPPLY

22mm

TUNDISH

22mm

MAX. 100mm

COMBINATION

V

ALVE

EXPANSION

RELIEF

P

IPE

COLD

MAINS-IN

15/22mm

EXPANSION
VESSEL

P

RESSURE + TEMPERATURE

RELIEF VALVE

HOT SUPPLY

15/22mm

TUNDISH

15mm

22mm

MAX. 100mm

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2.7 CONNECTION OF MAINS
WATER SUPPLY

For floor standing models:
On the front of the unit there is a label to identify the connection por
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.
supply and the cylinder f

An isolating valve should be installed between the cold water

or servicing. ALL PIPEWORK MUST BE FLUSHED

TO AVOID DAMAGE TO THE CONTROL VALVES.

ts.

ROTECH 50-80-100

ST P

Please refer to

FIGS. 2.1, 2.2, 2.3, 2.4, 2.5 for a suggested installation layout.

STD PROTECH 100

STD/STD PROTECH/ITD 125-150-210-300 DIRECT

FIG. 2.1

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FIG.

2.2

6

RETURN

FLOW

SECONDARY

RETURN

COMBINATION
VAL

VE

EXPANSION RELIEF

PIPE

COLD

MAINS-IN

22mm

DRAIN

EXPANSION
VESSEL

PRESSURE + TEMPERATURE
RELIEF VALVE

ZONE

VALVE

HOT SUPPLY

22mm

TUNDISH

22mm

MAX. 100mm

SECONDARY

RETURN

COMBINATION
VALVE

EXPANSION RELIEF

PIPE

COLD

MAINS-IN

28mm

DRAIN

EXPANSION

V

ESSEL

P

RESSURE + 

TEMPERATURE

RELIEF VALVE

HOT SUPPLY

2

8mm

TUNDISH

22mm

MAX. 100mm

RETURN

FLOW

SECONDARY

RETURN

C

OMBINATION

VALVE

EXPANSION RELIEF

PIPE

COLD

MAINS-IN

28mm

DRAIN

EXPANSION

V

ESSEL

PRESSURE + 

TEMPERATURE

RELIEF VALVE

ZONE
VALVE

HOT SUPPLY

28mm

TUNDISH

22mm

MAX. 100mm

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STI/STI PROTECH/ITI 125-150-210-300 INDIRECT

500 STD PROTECH

FIG. 2.3

500 STI PROTECH

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FIG.

FIG. 2.4

2.5

7

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2.8 COLD WATER
COMBINATION VALVE

The cold w

ater combination valve can be connected either close by

the unit or alter

natively it may be installed in a remote position from
the unit as there is no requirement to site it in close proximity to the
cylinder. This allows a flexible and convenient installation. However, it
is important to note allowances for the discharge pipe work from the
e

xpansion relief valve must be accounted for.

A balancing port is supplied on the 22mm valves (for units above 50
litres) and 28mm valves (for 500 litres units) 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. 2.7 and FIG. 2.8

Although this facility is not built into the 15mm valve (supplied with
model ST50), a tee piece may be inserted between the two
components giving the same result. Refer to

N

OTE!

HERE SHOULD BE NO OTHER VALVES FITTED BETWEEN THE CYLINDER AND

T

EXANSION VALVE

THE

.

FIG. 2.6

SERVICEABLE 1/2” PRESSURE

REDUCING CARTRIDGE AND

LINE STRAINER

15mm
COLD
MAINS IN

NON-RETURN

VALVE (WITHIN HOUSING)

TEE PIECE

FOR BALANCED

COLD WATER

TAKE OFF

(NOT SUPPLIED)

EXPANSION RELIEF

VALVE (SET AT 6 BAR)

. CONNECTIONS

.P

.S

B

3/4”
FOR EXPANSION VESSEL

15mm

TO CYLINDER

FIG. 2.6

For Model ST 50

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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 COLD
MAINS IN

3.5

6 BAR

NON-RETURN VALVE

(WITHIN HOUSING)

22mm TO WATER HEATER

15mm EXPANSION RELIEF
OUTLET TO TUNDISH

EXPANSION RELIEF VALVE
(SET AT 6 BAR)

22mm TO CYLINDER

FIG. 2.7

28mm COLD
MAINS IN

22mm BALANCED COLD WATER TAKE OFF

WITH NON-RETURN VALVE

SERVICEABLE 1” PRESSURE REDUCING
CARTRIDGE AND LINE STRAINER
(SET AT 3.5 BAR)

EXPANSION RELIEF VALVE
(SET AT 6 BAR)

O

T

28mm
CYLINDER

. CONNECTION

.P

.S

B

3/4”
FOR EXPANSION VESSEL

FIG.

2.8

1” BALANCED COLD WATER TAKE OFF

WITH NON-RETURN VALVE

For 500 litre

Models

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2.9 CONNECTION TO SERVICES

It is recommended that a 22mm pipe run should supply the outlets
throughout the b
15mm pipe may be used to connect basins and sinks.

uilding, especially to baths and showers. Short runs of

2.10 SECONDARY RETURN

2.11 DISCHARGE PIPEWORK

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) m
needed in conjunction with a pipe ther
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.

NOTE!
THE SAFETY RELIEF VALVES MUST NOT BE USED FOR ANY OTHER PURPOSE

1) The tundish must be vertical and fitted within 500mm of the temperature

& pressure relief valve and must be located with the cylinder. 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
terminate in a safe place where there is no risk to persons in the vicinity
of the discharge and to be of metal.

2) Discharge pipes from the temperature & pressure relief and expansion

relief valve may be joined together.

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

ust be fitted to prevent back flow and a bronze pump will be

mostat to circulate the hot water (both

FIG. 2.9 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.

The discharge pipe must be installed with a continuous fall.

5)

6) The discharge must 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; I.e. into a metal hopper and metal down

pipe with the end of the discharge pipe clear

le or not).

visib
temper
systems that w
Where a single pipe ser

iv)

b
than 6 systems so that any installation can be traced reasonably
easily

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pipe siz

ature discharges of w

ks of flats

loc

The single common discharge pipe should be at least one

.

e large than the largest individual discharge pipe to be

Or onto a roof capab

ater 3m from an

ould collect such a discharge (tundish visible).

umber of discharges

es a n

v

ed should be limited to not more

, the n

umber ser

v

le of withstanding high

ly visib

y plastic gutter

le (tundish

, such as in

ing

10

5

00mm Max.

300mm
Min.

Temperature & pressure
relief valve

Metal discharge pipe (D1) from
temperature & pressure relief valve.
to tundish.

Metal discharge pipe (D2) from tundish
with continuous fall. See Table 2 and worked
example.

Tundish

Fixed grating

Trapped gulley

Discharge below
fixed grating.
(see page 10 for
alternative points
of discharge).



Valve outlet size Minimum size of

discharge pipe D1*

Minimum size of

discharge pipe D2*

from tundish

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

G 3/4 22mm 28mm

35mm
42mm

Up to 9m
Up to 18m
Up to 27m

1.0m

1.4m

1.7m

G 1 28mm 35mm

42mm
54mm

Up to 9m
Up to 18m
Up to 27m

1.4m

1.7m

2.3m

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connected. If unvented hot water storage systems are installed
where discharges from saf

ety 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 war n when d ischarg e takes

. Note: The discharge will consist of scalding water and

place
steam. Asphalt, roofing felt and non-metallic rainwater goods may

FIG. 2.9

TABLE 2. Sizing of copper discharge pipe “D2” for common temperature valve outlet sizes.

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be damaged b

WORKED EXAMPLE

xample below is for a G

The e
discharge pipe (D2) having 4 no. elbows and length of 7m from the tundish to
the point of discharge.

F

Maximum resistance allowed for a straight length of 22mm copper discharge
pipe (D2) from G
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

rom

TABLE 2;

1

/2temperature & pressure valve is 9m. Subtract the resistance

y such discharges

1

/2temper

.

ature & pressure relief valve with a

11

240V~

Electronic anode

Anode circuit

N1L

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calculate the next largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from G
temperature & pressure valve equates to: 18m. Subtract the resistance for 4 no.
28mm elbow at 1.0m 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 temper
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.

ature & pressure relief valve must not be used for

1

2

/

2.12 ELECTRICAL
CONNECTION

The temper
circumstances. Any of the above will totally invalidate the guarantee.

The electrical installation must be in accordance with the current I.E.E.
wiring regulations.

PROTECH ELECTRONIC ANTI-CORROSION SYSTEM
IMPORTANT: The ProTech anti-corrosion system MUST be permanently

connected to a 240V electricity supply see FIG 2.10.

ature & pressure relief valve must not be removed in any

FIG. 2.10

The ProTech system, an exclusive solution, is an electronic anti-corrosion

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protection system which ensures maximum longevity of the appliance,

The electronic circuit creates a difference in

regardless of w
potential between the hot water tank and the titanium electrode, thereby
guaranteeing optimum protection of the tank and preventing corrosion.

o ensure the proper oper

T

PERMANENTLY CONNECTED TO A FUSED NON-SWITCHED 240V, 3A
ELECTRICITY SUPPLY even in the event of shut-down of the system. To

ater quality

.

ation of the protection system,

IT MUST BE

12

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prevent risk to the appliance’s lifespan when disconnecting the protection
system f
beforehand.
In addition to the 240V netw
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
In the e
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.

FITTING IMMERSION HEATER(S) (100 - 300 litre foor standing only)

These are supplied with but not fitted to 100 - 300 floor-standing models. A
sealing gasket is supplied with each element, however the use of a suitable
sealing compound is recommended to ensure a correct seal. Care must be
taken not to cross thread the immersion heater(s) when fitting. Each
immersion heater is supplied with a regulation thermostat and manual reset
thermal cut-out. This will activate if the regulation thermostat fails. Under no
circumstances should this be by-passed. The immersion heaters supplied
are rated at 3kW, there are 4kW upgrade kits available on request, (the part
number for which is 925392). Should the immersion heater(s) be ugraded to
the 4kW immersion, the electrical circuit and fuse must be checked to
ensure suitability with the higher output. Although the immersion heaters
are a standard 2
original Ariston spare part.

or an extended period of time, it is necessary to drain the appliance

ork, the electronic circuit is also connected to

, indicating that the circuits terminals are being supplied with electricity.

vent of failure, a red L.E.D. indicates that there is a short-circuit

1

/4” thread, they must not be substituted with anything but an

NOTE!
T

HE IMMERSION HEATERS MUST NOT BE FITTED WITHOUT THE THERMOSTAT/THERMAL

-OUT.

CUT

DIRECT SYSTEMS

A mains supply of 240V, 3kW (13 amps) is required. Heat resistant cable,
round 3 or 4 core 2.5mm2(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. 2.11.

SYSTEM A SYSTEM B

2.11

FIG.

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13

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2.11 ELECTRICAL DIAGRAM

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
immersion heater(s) as per
litre models consult the wiring diagram on the reverse of the inspection
panel.

Table 8 of BS 6141: 1991. Make the connection(s) to the

FIG. 2.12 and FIG. 2.13. For High Capacity 500

Single Element

L1

N

FIG. 2.12

L1

N

THERMAL

CUT-OUT

THERMAL

CUT-OUT

THERMOSTAT

THERMOSTAT

ELEMENT
3 kW

~

240V

DAY ELEMENT
3 kW 240V

~

THERMAL

CUT-OUT

THERMOSTAT

L2

NIGHT ELEMENT
3 kW 240V
ECONOMY 7

~

N

FIG. 2.13

The ther
60°C. This is the ideal temperature to prolong element life in hard water
areas. Scale on the sheath builds up more rapidly at temperatures above
this causing the element to overheat and premature failure can occur. Higher
temper

In addition to the thermostat the thermal cut-out will switch power off to the
element should the ther
water temperature. The thermal cut-out can be reset manually after the fault
has been corrected.

mostat(s) on the immersion heater(s) should be adjusted to tr

atures without additional controls w

mostat malfunction, causing an excessive rise in

ould result in scalding.

ip at

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INDIRECT SYSTEMS

or models up to 300 litres a mains supply of 240V, 3kW (13 amps) will be

F
required for the direct immersion heater. heat resistant cable, round 3 core

2.5mm2(to BS) m

ust be used. For

High Capacity 500 litre models consult
the wiring diagram on the reverse of the inspection panel.
For indirect controls a 240V, 3 amp supply is required.
On floor standing models it is necessary to fit the thermostat using P.T.F.E
tape (Please consult the label on the f

ace of the unit for the correct location
in both cases).
The cables must be clamped in position (as previously stated) and the
control thermostat should be set at 60°C for the reasons above. In addition
to the thermostat there is a thermal cut-out should the thermostat fail. Refer
to

FIG. 2.14.

The indirect coil must not be connected to an uncontrolled heat source e.g.
solid fuel and must be connected to a thermostatically controlled appliance.

WIRING SCHEME

14

35

22

T6360B

OOM

R

THERMOSTAT

Based on Honeywell Controls

BROWN

BLUE

GREY

ORANGE

GREEN/YELLOW

V4043H

HEATING VALVE

BROWN

BLUE

GREY

ORANGE

GREEN/YELLOW

V4043H

T WATER VALVE

HO

L1

N2

E3

240V

MAINS INPUT (3 AMP)

Cylinder

mostat

ther

1

2

FOR

OR

Thermal

cut-out

2 X 2 PORTMO

A

5
2
1

10

3

8
2
1

10

3

P

TYPICAL

JUNCTION BOX

1

P

2

CM 41
CM 51

• 1

• 2

• 3

• 4

• 5

• 6

• 7

• 8

• 9

• 10

B

8

6

Not
used

TORISED

4 3 2 1

6

3 2 1

6 4

VES

VAL

1

5

2 5 E N L

Pegler Sunvic

SP 50/100 (Link L-3)

L

N

3

6

Honeywell ST 699B 1002

Link L-5-8

10 2 3
9

9 10 3 2 1

3 1 N L

1 4 N L

Symphony, Sonata

Switchmaster

ST 6400/ST 6300 ST 6200 3 4 N L

7 4 E 1 2

Sunvic ET 1451

Link 2-3-6

Switchmaster 400, 600 3 1 N L

SWITCHMASTER 805, 900

1 4 E N L

3 4 N L

WB2

Horstmann 425, 525, 527

Link L-2-5

Landis & Gyr R

Glowworm Mastermind

Drayton Tempus 7 3 4 N L

L N E

N

E

L

9 12 E N L L N E

7 SL E N L L N E

PL SL E N L L N E

age 16)

y Plus

m Econom

e link SL-9)

or

v

ww

(remove link 12-7)

(remo

Glowworm Spacesaver KFB50

and 30RS to 60RS

Glo

Baxi Solo 2 30PF To 80PF

Basic Boilers (see P

6 10 2 1

6 10 2 1

erchron MP
w

o

Sunvic DHP 2201 6 3 E 1 2

Towerchron FP

Link 1-5/4-7-9

T

Link 1-4/6-11

3 4 N L

WB20

Link L-5 EP2001/3001

Potterton EP2000/3000 - 3 4 N L

Landis & Gyr R

Microgyr

Potterton Miniminder 3 4 N L

L N E

L

N

E N L L N E

E

1

2

P SL

P SL E N L L N E

ange

m Fuelsaver 100FF

m Ultimate SS

or

or

ww

ww

(remove link 7 - 12)

Halstead Best r

(remove link SL - 4)

Glo

Glo

N L

ON ON

Towerchron 2000 HW HTG

ACL LS522, LS722 3 4 N L

Randall 102/102 E 1 2 E 5 6

Link 3-6

Randall 4033

Ideal Mexico Super 2 PL LB E N L L N E

Halstead Blenheim range LP 2 E N L L N E

Halstead Balmoral range 9 6 E N 12 L N E

6 E N L

4 2 E N L

3

and 3060

Link L-2-5

Randall 3020 P

Randall 922, 972

6

7

E

E N L

2

1

8 E 4 3

4

3

1

Link 1-6

Randall 701, 702

Link L-6-5

Sangamo M5

PL ON E N L L N E

(remove all links)

Myson Apollo

BOILER PUMP

to manufacturers instructions.

Potterton Profile/Suprima PL SL E N L L N E

For ARISTON, Vaillant, Vokèra,

Burco Maxol and other makes, refer

PROGRAMMER

4 3

E

8

OGRAMMER

1

PR

Link 3-6

Link 1-6

Sangamo 410 Form 1

E

L

N

240V

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FIG. 2.14

MAINS INPUT (13 AMP)

L1

240V~

N

Thermal

cut-out

Thermostat

ELEMENT

3 kW 240V

~

15

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BASIC BOILER LIST

Baxi Bermuda range

Boston RS and OF range

Glowworm Complheat

Hideaway range 65 - 80
Ultimate 40 - 80

Halstead Buckingham range

Potterton Kingfisher range

Statesman range (oil fired)

Caradon Ideal Classic range

Mexico Super range
Mexico Slimline range

Newflame Boilers Backboiler range

Condensing Boiler List

30B - 80B, 30CF - 60CF

CARADON IDEAL
GLOWWORM Energysaver (Remove link SL-9) PL SL E N L
KESTON LE N
POTTERTON Envoy 30F - 80F PL SL E N L

VAILLANT VU 186, 226 manufacturers

Boiler Connections 2 Motorised valves 2 way (see Fig. 2.14) 9 10 3 2 1

Pump Connections 2 Motor

Minimiser FF30 - FF80 L E N

refer to

instructions

es 2 way (see

alv

ised v

ARNING :THE APPLIANCE MUST BE EARTHED.

W

The earth continuity conductor of the electrical installation must be
effectively connected to all exposed parts of other appliances and services
in the room in which the water heater is to be installed, conformity with the
I.E.E. wiring regulations.

FIG.

2.14

)

9

3 2

NOTE: Do not switch on the immersion heater or fire the boiler until the
cylinder is full of w

ater.

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3. COMMISSIONING

Check for obvious signs of damage to the cylinder and controls, and also
that the controls fitted correspond with the ref
instructions.

Ensure that the Drain Cock at the base of the appliance is closed before
commencing.

erences quoted in these

1) ProTech Models Only.

connected to the electr

2) Open all outlet taps;

3) Turn on mains water supply and allow the water heater to fill;

4) Ensure that the hot water system is flushed in accordance with BS 6700;

5) Close taps in turn after having purged the system of air;

6) Check for leaks around the controls and immersion heaters and again

after the unit has heated up;

7) Check that no water is passing to waste through the relief valves;

8) Ensure that the line strainer (situated in the pressure reducing valve) is

clear of installation debris and clean if necessary;

9) Test the operation of the temperature & pressure relief and expansion

valves by lifting/turning the manually operated test lever/cap and
observing that water flows through freely and safely to waste;

10) Check that the pressure in the expansion vessel is correct;

Ensure that the
ical supply;

ProT

ech

anti-corrosion system is

11) Check that the discharge pipe is plumbed so that it falls continuously

and that no taps, valves or other shut off devices are installed in the
pipe;

12) Check that all thermostats are set at 60°C;

13) DIRECT UNITS. Switch on immersion heater(s) and allow unit to heat

up. Check operation of Thermostat(s);

14) INDIRECT UNITS. Fill the indirect (primary) circuit following the boiler

instructions. Switch on the boiler, ensure that the programmer is in the
domestic hot water position. Allow unit to heat up and check operation of
indirect thermostat on motorised valve(s);

15) Check the temperature of the hot water at the nearest outlet and record

in the Benchmark Log Book;

16) Demonstrate operation to user, including operation of temperature &

pressure relief valve and what to do if it operates;

17) Give this manual along with the completed Benchmark Log Book to the

user to retain for future reference and make the customer aware that
periodic checks of the equipment are essential for safety.

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4. MAINTENANCE

To ensure efficient safe operation, it is recommended that the appliance is
serviced annually by a competent person.

After servicing, preliminary electrical system checks must be carried out to
ensure electrical safety (i.e. polarity, earth continuity, resistance to earth and
short circuit).

4.1 PROTECH
ANTI-CORROSION SYSTEM

ARNING:

W

THE APPLIANCE.

Trouble-shooting:

1) The green L.E.D. is NOT on:

- Check to see that the circuits electric plug is connected (if not,
connect);

- Check to see that the P.C.B, is supplied with electricity (if not, replace
the supply cab

- Check to see that 230 V electricity is supplied (if not, ensure that 230 V
is supplied);

- If all these checks fail to locate the problem, replace the electronic
circuit (installer).

2) The red L.E.D. is on:

- Check to see that the tank is filled with water (if not, fill it before
carrying out the following checks);

- Check to see that the clip-on circuit connector is in the proper position
(if not, position correctly);

- Check to see that the electrodes connection lead is property connected
(to check this, gently pull on it) (if not, replace the electrode);

- Check to see that the connection lead to the tank is properly connected
to the tank (if not, connect properly); .

- Check to see that the two leads from the clip-on circuit connector are
not damaged, stripped, etc. (if so, replace the electrode);

- If all these checks fail to locate the problem, replace the electronic
circuit.

SWITCH OFF

le);

THE POWER SUPPLY BEFORE WORKING ON

NOTE: To replace the P.C.B, there is no need to drain the cylinder;

1) Disconnect the two supply cables from the P.C.B. to the supply terminal;

2) Disconnect the clip-on circuit connector and polarising slot which
connects the circuit to the tank and the electrode;

3) Disconnect the P.C.B. from its supporting plate (plastic clips in the 4

ners) and;

cor

4) Replace the defective circuit with a new one, then re-install in reverse

e.

order to the abo

4.2 THERMAL CUT-OUT(S)

4.3 IMMERSION HEATER(S)

4.4 UNVENTED CONTROLS

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If the thermal cut-out has operated the cause must be found before resetting
(see section 5).

Should the immersion heater(s) become scaled, we would recommend that
the immersion heaters be replaced, also ensure that the ther
below 60

Check controls as per the following:

1) Line strainer - with the water supply turned off remove screen from

2)

3) Temperature & pressure relief valve - with the water supply turned on,

O

C to prevent further scale formation.

strainer and clean of any detritus;
Expansion v
expansion vessel pressure and top up as necessary;

k man

chec
closes after testing)

v

mostat is set

essel - with the w

ually by lifting the test lever/turning the test knob (ensure valve

;

ater supply tur

ned off and taps open, check

18

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4) Expansion relief valve - check manually by turning the test knob

alve closes after testing)

v

5) Discharge pipes (D1) - from both temperature & pressure relief and

xpansion relief valve for obstructions;

e

6) Tundish & discharge pipe (D2) - open either valve gradually to produce a
full bore discharge into tundish and D2 without any back pressure;

7) Pressure reducing valve - check that the correct outlet pressure is being
maintained b

y recording the pressure at an in-line terminal fitting i.e. tap.

;

(ensure

4.5 THERMOSTATS

4.6 MAINTENANCE

Ensure that all thermostats adjusted for the correct temperature setting, this
should be between 60 and 65°C.

To ensure efficient safe operation, it is recommended that the appliance is
serviced annually by a competent person.

After servicing, preliminary electrical system checks must be carried out to
ensure electrical safety (i.e. polarity, earth continuity, resistance to earth and
short circuit).

To drain the cylinder it is necessary to proceed as follows:

1) Close the mains supply service valve;

2) Open hot water taps;

3) Attach a hose and open the drain cock and allow the cylinder to empty.

Magneisum Anodes (Classico model only)

No longer than every 12 months, the installer should check the magnesium
anti-corrosion anodes (consult the label on the face of the unit for the correct
location). Assessment of the condition of the bottom anode (where fitted)
can be made by judging the condition of the top anode.

Removal of anodes;

1) Close the mains supply service valve;

2) Open hot water taps;

3) Attach a hose and open the drain cock and allow the cylinder to empty;

ed by unscrewing;

The anodes are remo

4)

EXAMINE THE ANODES AND REPLACE IF THE DIAMETER IS LESS
THAN 10mm.

The use of an approved P.T.F.E. sealing tape is recommended to ensure

tight connection for anodes.

ater

w

Thermal Cut-out(s)

If the thermal cut-out has operated the cause must be found before
resetting.

sion Heater(s)

Immer

Should the immersion heater be scaled, we would recommend it be
replaced.

v

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Unvented Controls(s)

Check controls as per the following:

1) Line strainer - with the water supply turned off remove screen from
ainer and clean of any detritus;

str

Expansion vessel - with the water supply turned off and taps open, check

2)

expansion vessel pressure and top up as necessary;

3) Temperature & pressure relief valve - with the water supply turned on,

check manually by lifting the test lever/turning the test knob (ensure valve
closes after testing)

;

4) Expansion relief valve - check manually by turning the test knob

valve closes after testing)

5) Discharge pipes (D1) - from both temperature & pressure relief and

expansion relief valve for obstructions;

6) Tundish & discharge pipe (D2) - open either valve gradually to produce a

full bore discharge into tundish and D2 without an

7) Pressure reducing valve - check that the correct outlet pressure is being

maintained by recording the pressure at an in-line terminal fitting i.e. tap.

Thermostats

Ensure that all thermostats adjusted for the correct temperature setting, this
should be between 60 and 65°C.

NOTE!
WHERE THERE IS A POSSIBILITY OF SCALE FORMING, IT IS RECOMMENDED TO ADJUST

THE THERMOSTAT TO BELOW

;

y back pressure;

60OC

(ensure

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5. FAULT FINDING

FAULT POSSIBLE CAUSES REMEDY

1) Mains cold water Check and open Isolating
supply shut off and/or stop valve. Check

NO HOT WATER 2) Line strainer Turn off mains water supply,
FLOW blocked remove line strainer and

3) Cold Water Check direction of flow
Combination valve arrows on valve, refit in
fitted incorrectly correct position if necessary

w mains water Check pressure, consult

1) Lo
pressure Local Water Authority if

REDUCED FLO
RATE partially blocked remove line strainer and

WATER FROM 3) Boiler programmer Check switch on domestic
HOT TAPS set to central hot water if necessary
IS COLD heating only

DISCHARGE FROM 1) Pressure above 7 Shut down boiler or immersion
PRESSURE/ bar
TEMPERATURE pressure reducing reducing valve and thermal
RELIEF VALVE valve. Temperature controls. Replace if

DISCHARGE FROM 1) Continually. Check pressure from valve.
EXPANSION Pressure reducing Replace if over 3.5 bar
V

AL

VE

W

2) Line str

3) Siz

1) Direct immersion Check immersion heater,

2) Direct thermal Test thermostat operation

4) Boiler is not Check boiler operation, if

5) Indirect thermal Test thermostat operation

6) Motorised valve Check wiring and operation of

2) When heater is heating. Check charge of vessel. Re-

ainer Turn off mains water supply,

e of service Increase to size stated on

pipe too small page 6

heater is not

witched on

s

cut-out has and wiring, if faulty,
operated correct/replace. Reset cut-out

(Indirect models)

functioning fault suspected consult
(Indirect models) manufacturer's instructions

cut-out has and wiring, if faulty,
operated correct/replace. Reset

jammed or not motorised valve correct/
wired correctly
(Indirect models)

ailure of

, f

above 90 C failure necessary

mal control

of ther

v

alv

e faulty

Faulty expansion charge vessel to 3.5 bar or

essel or lost charge replace if necessary

v

water, Local Water Authority

clean

necessar

clean

switch on if necessary

cut-out

replace as necessar

heater

y

y

. Check pressure

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21

Model

Time taken to raise tempera

ture

from 15˚C to 65

˚

C

Time taken to raise 70% of the

stored volume to 65

˚

C

STI/STI ProTech 125***

15 mins

13 mins

STI/STI ProTech 210***

24 mins

21 mins

ITI 125***

?? mins

?? mins

ITI 300***

?? mins

?? mins

High Capacity 500 STI***

44 mins

38 mins

Contract STD 100

2 hrs 30 mins

1 hr 15 mins

Contract STD 210

Contract STD 300****

1 hr 58 mins

2 hr 47 mins

1 hr 39 mins

1 hr 45 mins

*** Indirectly heated. Figures obtained by WRc-NSF Limited in accorda

nce with Test Criter

ia 1-50-220 & 1-50-2

22.

**** With 4kW upgrade kit

fitted. Figures obtained

by WRc-NSF Limited i

n accorcdance with Test Criteria 1-50

-220 & 1-50-222.

ST ProTech

50*

**

63

mins

33

mins

ST ProTech 1

00

***

1 hr 56 mins

72 mins

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6. TECHNICAL INFORMATION

500 STI UK
High Capacity

12
500 STD UK
High Capacity

12
ITI 300

12
ITI 210

12
ITI 150

12
ITI 125

12
ITD 300

12
ITD 210

12
ITD 150

12
ITD 125

12
STI/STI ProTech 300

12
STI/STI ProTech 210

12
STI/STI ProTech 150

12
STI/STI ProTech 125

12
STD/STD ProTech 300

12
STD/STD ProTech 210

12
STD/STD ProTech 150

12
STD/STD ProTech 125

12
STD ProTech 100

12
ST ProTech 100

12
ST ProTech 80

12
ST ProTech 50

12

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

bar

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

3.5

bar

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

6

7/90

3.5

240/415

3.5

240/415

3.5

2403350

3.5

2403350

3.5

2403350

3.5

2403350

3.5

240

3.5

240

3.5

240

3.5

240

3.5

2403350

3.5

2403350

3.5

2403350

3.5

2403350

3.5

240

3.5

240

3.5

240

3.5

240

3.5

2403350

3.5

2403480

3.5

2403480

3.5

2403480

bar

V

6

6

3+3

3+3

3+3

3+3

3+3

3+3

3+3

3+3

400

400

350

350

350

350

350

350

350

350

mm

(2)

(2)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

(3)

290

290

240

240

175

150

350

240

175

150

350

240

175

150

350

240

175

150

120

120

90

60

C) mins

°

3.5

-

3.5

3.5

3.5

3.5

-

-

-

-

3.5

3.5

3.5

3.5

-

-

-

-

-

-

-

-

31.8

1.50543.60

-

-

26.7

0.90262.85

26.7

0.90262.40

26.7

0.90222.20

20.5

0.75182.00

-

-

-

-

-

-

-

-

26.7

0.90402.85

26.7

0.90262.40

26.7

0.90222.20

20.5

0.75182.00

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

2

149

­130

3.60

37

27

21

17

-

31

2.85

-

20

2.10

-

14

1.90

-

13

1.70
95

56

BS 3456 Section 2.21

(3)

51

41

-

85

2.85

-

45

2.10

-

40

1.90

-

1.70

-

1.50

-

1.26

-

1.40

-

1.15

C

°

Single Phase/Three Phase

(2)

33

29

41

Single Phase

(1)

40

27

/h circulation.

3

essel Charge Pressure

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22

V

ating Pressure

Maximum Water Supply Pressure* bar

Oper

Expansion

e Set Pressure
alv

V

Temperature Relief Valve Setting bar/°C

ical Supply

Expansion Relief Valve Setting bar

Pressure &

Pressure Reducing

Electr

(Single Immersion Heater) (∆T 50

ype
T

y Pressure bar

Time

imar

um Pr

Maxim

Immersion Heater Rating kW

Immersion Heater Length

Immersion Heater

Immersion Heater Refernce Number

Indirect Coil Rating kW

Direct Reheat

Coil Surface Area m

Indirect Reheat Time (∆T 50°C)** mins

Heat Loss (kWh in 24h) @ 60

Nett Weight Kg

* To pressure reducing valve **Primary circuit 80°C, 1m

www.tradeplumbing.co.uk Call Sales On 08708034288

NOTES

www.tradeplumbing.co.uk Call Sales On 08708034288

23

www.tradeplumbing.co.uk Call Sales On 08708034288

acturer:

uf

Man

Commercial subsidiary: MTS (GB) LIMITED

www.tradeplumbing.co.uk Call Sales On 08708034288

24

MTS Benelux sa/n

MTS Building
Hughenden Avenue
High Wycombe
Bucks. HP13 5FT

elephone:

T
Fax: [phone]
Internet: www.ariston.co.uk
E-mail:

Technical Service Hot Line: [phone]
Customer Service Help Desk: [phone]

[phone]

[e-mail]

inf

v - Belgium

.uk

roup

Ariston Unvented Cylinder Manual 22/7/2004