Ariston CONTRACT ST 50 Guide

Instructions

for Installation,

Servicing and Use

LEAVE THESE INSTRUCTIONS

WITH THE END-USER

Unvented Hot

Water Storage

Cylinders

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 MAGNESIUM ANTI-CORROSION ANODES

4.2 PROTECH ANTI-CORROSION SYSTEM

4.3 THERMAL CUT-OUT(S)

4.4 IMMERSION HEATER(S)

4.5 UNVENTED CONTROLS

4.6 THERMOSTATS

5. FAULT FINDING

6. TECHNICAL 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.

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.

The range is available with the following options:

The Wall-hung range (50, 75, 100 litre models), which are supplied as the

following;

One large box containing;

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

immersion heater and thermostat with thermal cut-out.

One small box containing;

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

valve, tundish).

The Ariston Contract and the Ariston Comfort (indirect only) floor-standing

range (125, 150, 200 and 300 litre models).

The Contract is supplied with the following;

One large box containing;

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

2) Immersion heater(s) and thermostat(s) with thermal cut-out(s) (not fitted).

3) Cylinder thermostat with thermal cut-out (indirect only).

4) Feet x 3.

One small box containing;

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

valve, tundish) and separate motorised valve (indirect only).

The Comfort is supplied with the following;

One large box containing;

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

2) Factory fitted immersion heater and thermostat with thermal cut-out (dry

pocket).

3) Factory fitted cylinder thermostat with thermal cut-out.

4) Feet x 3.

One small box containing;

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

valve, tundish) and separate motorised valve.

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

supplied as the following;

One large box containing;

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

immersion heater and thermostat with thermal cut-out.

2) Cylinder thermostat with thermal cut-ou (indirect only).

3) Feet x 3.

One small box containing;

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

tundish) and separate motorised valve (indirect only).

1. GENERAL

INFORMATION

1.2 DELIVERY

2.3 HOW THE APPLIANCE

WORKS

2. INSTALLATION

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 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.

High Capacity 500 litre models have magnesium anodes provided to prevent

corrosion of the water cylinder tank. Wall-hung units have a single

magnesium anode. The Contract and Comfort 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 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.

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.

2.1 WATER REGULATIONS

2.2 BUILDING REGULATIONS

MODEL STORAGE UNITS PIPES SIZE DIMENSIONS IN MM WEIGHT

CAPACITY INLET OUTLET A B C D E F WHEN

FULL KG

DIRECT RANGE

Wall Hung

ST 50

ST 80

ST 100

Floor Standing

CONTRACT STD 100

CONTRACT STD 125

CONTRACT STD 150

CONTRACT STD 210

CONTRACT STD 300

500 STD UK

INDIRECT RANGE

CONTRACT STI 125

CONTRACT STI 150

CONTRACT STI 210

CONTRACT STI 300

500 STI UK

COMFORT STI 125

COMFORT STI 150

COMFORT STI 210

50 L

75 L

100 L

125 L

150 L

200 L

300 L

495 L

125 L

150 L

200 L

300 L

495 L

125 L

150 L

200 L

1/2”

3/4”

3/4"

1”

3/4”

410

590

550

530

700

840

990

1215

1390

700

840

990

1215

1390

700

840

990

0.75

0.9

1.5

0.75

0.9

120

175

650

805

965

1280

1555

335

805

965

1280

1555

335

805

965

1280

580

740

700

890

1045

1205

1525

1790

1870

1045

1205

1525

1790

1870

1045

1205

1525

160

230

675

815

700

675

815

475

575

460

560

505

560

714

505

560

714

505

115

141

129

158

190

245

385

630

166

201

256

395

641

169

203

258

TABLE 1

COIL

SURFACE

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 the system.

A minimum pressure of approximately 1.5 bar and 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 at any convenient position, as it is connected

to the mains cold water supply, it is equally effective on any floor.

However, 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).

The ST50, ST80 and ST100 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 to electrical components, immersion heater(s) and

magnesium anodes (where applicable).

2.5 COLD WATER SUPPLY

2.4 OVERALL DIMENSIONS

2.6 SITING AND FIXING

315

22 30'

ST 50-80-100

CONTRACT

STD 100-125-150-210

22 30'

275

315

CONTRACT

STI 125-150-210-300

795

230

500 STD UK - 500 STI UK

22 30'

275

315

COMFORT

STI 125-150-210

SECONDARY

RETURN

COMBINATION

VALVE

EXPANSION RELIEF

PIPE

COLD

MAINS-IN

22mm

DRAIN

EXPANSION

VESSEL

PRESSURE + TEMPERATURE

RELIEF VALVE

HOT SUPPLY

22mm

TUNDISH

22mm

MAX. 100mm

FIG.2.2

2.7 CONNECTION OF MAINS

WATER SUPPLY

For Contract, Comfort and High Capacity 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 ST50 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 TO THE CONTROL VALVES.

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

CONTRACT STD 100-125-150-210-300 DIRECT

COMBINATION

VALVE

EXPANSION

RELIEF

PIPE

COLD

MAINS-IN

15/22mm

EXPANSION

VESSEL

PRESSURE + TEMPERATURE

RELIEF VALVE

HOT SUPPLY

15/22mm

TUNDISH

15mm

22mm

MAX. 100mm

FIG.2.1

WALL-HUNG ST 50-80-100

RETURN

FLOW

SECONDARY

RETURN

COMBINATION

VALVE

EXPANSION RELIEF

PIPE

COLD

MAINS-IN

22mm

DRAIN

EXPANSION

VESSEL

PRESSURE + TEMPERATURE

RELIEF VALVE

ZONE

VALVE

HOT SUPPLY

22mm

TUNDISH

22mm

MAX. 100mm

FIG. 2.3

CONTRACT - COMFORT

STI 100-125-150-210-300 INDIRECT

SECONDARY

RETURN

COMBINATION

VALVE

EXPANSION RELIEF

PIPE

COLD

MAINS-IN

28mm

DRAIN

EXPANSION

VESSEL

PRESSURE +

TEMPERATURE

RELIEF VALVE

HOT SUPPLY

28mm

TUNDISH

22mm

MAX. 100mm

FIG.2.4

HIGH CAPACITY 500 STD UK DIRECT

RETURN

FLOW

SECONDARY

RETURN

COMBINATION

VALVE

EXPANSION RELIEF

PIPE

COLD

MAINS-IN

28mm

DRAIN

EXPANSION

VESSEL

PRESSURE +

TEMPERATURE

RELIEF VALVE

ZONE

VALVE

HOT SUPPLY

28mm

TUNDISH

22mm

MAX. 100mm

FIG. 2.5

HIGH CAPACITY 500 STI UK INDIRECT

The cold water combination valve can be connected either close by

the unit or alternatively 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

expansion 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.2.7and 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 FIG.2.6

2.8 COLD WATER

COMBINATION VALVE

15mm

COLD

MAINS IN

15mm

TO CYLINDER

3/4”B.S.P. CONNECTIONS

FOR EXPANSION VESSEL

EXPANSION RELIEF

VALVE (SET AT 6 BAR)

NON-RETURN

VALVE (WITHIN HOUSING)

TEE PIECE

FOR BALANCED

COLD WATER

TAKE OFF

(NOT SUPPLIED)

SERVICEABLE 1/2”PRESSURE

REDUCING CARTRIDGE AND

LINE STRAINER

For Model ST 50

FIG.2.6

22mm COLD

MAINS IN

22mm COLD

MAINS IN

22mm TO WATER HEATER

3/4”B.S.P. CONNECTION

FOR EXPANSION VESSEL

22mm TO CYLINDER

NON-RETURN VALVE

(WITHIN HOUSING)

22mm BALANCED COLD WATER TAKE OFF

WITH NON-RETURN VALVE

15mm EXPANSION RELIEF

OUTLET TO TUNDISH

SERVICEABLE 3/4”PRESSURE REDUCING

CARTRIDGE AND LINE STRAINER

(SET AT 3.5 BAR)

EXPANSION RELIEF VALVE

(SET AT 6 BAR)

3.5

6 BAR

For 500 litre

Models

28mm COLD

MAINS IN 28mm TO

CYLINDER

SERVICEABLE 1”PRESSURE REDUCING

CARTRIDGE AND LINE STRAINER

(SET AT 3.5 BAR)

3/4”B.S.P. CONNECTION

FOR EXPANSION VESSEL

EXPANSION RELIEF VALVE

(SET AT 6 BAR)

1”BALANCED COLD WATER TAKE OFF

WITH NON-RETURN VALVE

FIG.2.7

FIG.2.8

2.9 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.

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 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.

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 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.

5) The discharge pipe must be installed with a continuous fall.

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 clearly visible (tundish

visible or not). Or onto a roof capable of withstanding high

temperature discharges of water 3m from any plastic guttering

systems that collect would such a discharge (tundish visible).

iv) Where a single pipe serves a number of discharges, such as in

blocks of flats, the number served should be limited to not more

than 6 systems so that any installation can be traced reasonably

easily. 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,

2.10 SECONDARY RETURN

2.11 DISCHARGE PIPEWORK

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