Kwikot D 150, D 210 User Manual

Readers are advised to check the validity of this Certificate by either referring to the BBA’s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).

1 The Building Regulations 2000 (as amended) (England and Wales)

The Secretary of State has agreed with the British Board of Agrément the aspects of performance to be used by the BBA in assessing the

compliance of unvented hot water storage systems with the Building Regulations. In the opinion of the BBA, Kwikot Unvented Hot Water Storage Systems, if used in accordance with the provisions of this Certificate, will meet or contribute to meeting the relevant requirements.

Requirement: G3 Hot water storage

Comment:

See the tinted areas of the

Safety

section and the relevant

tinted area of the

Installation

section of the accompanying

system Detail Sheets.

Requirement: L1 Dwellings

Comment:

See the tinted areas of the

Hot water storage and supply

section of the accompanying system Detail Sheets. Systems with a capacity of more than 150 litres that are not heated by off-peak electricity should be fitted with a time switch.

Requirement: Regulation 7 Materials and workmanship

Comment:

The systems are acceptable.

Kwikot Limited

Aberdeen Road P O Box 389 Benoni 1500 Republic of South Africa

Tel: 00 27 11 914 2300 Fax: 00 27 11 914 1286

e-mail: hotwater@kwikotinl.co.za website: www.kwikot.co.za

Agrément

Certificate

No 96/3253

Third issue*

Designated by Government

to issue

European Technical

Approvals

KWIKOT UNVENTED HOT WATER STORAGE SYSTEMS

Système d’eau chaude sanitaire Heißwasserbereiter

Product

Regulations — Detail Sheet 1

• THIS CERTIFICATE RELATES TO KWIKOT UNVENTED HOT WATER STORAGE SYSTEMS.

• The systems are for use in domestic, commercial and public buildings with domestic hot and cold water services to BS 6700 : 1997.

• T

he systems are for connection

to mains water supply at pressures up to 12 bar.

• Kwikot is distributed in the UK by A & J Gummers, Unit H, Redfern Park Way, Tyseley, Birmingham B11 2DN and Stockgap Ltd, 209 Watling Street, Dartford, Kent DA1 6EG.

CI/SfB

(53.3) X

continued

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2 The Building Standards (Scotland) Regulations 1990 (as amended)

In the opinion of the BBA, Kwikot Unvented Hot Water Storage Systems,

if used in accordance with the provisions of this Certificate, will satisfy or

contribute to satisfying the various Regulations and related Technical Standards listed below.

Regulation: 10 Fitness of materials and workmanship

Standard: B2.1 Selection and use of materials, fittings, and components, and workmanship Comment: The product can contribute to a construction meeting this

Standard. See the

Installation

part of the relevant Detail Sheet.

Standard: B2.2 Selection and use of materials, fittings, and components, and workmanship

Comment:

The product is an acceptable material.

Regulation: 22 Conservation of fuel and power Standards: J11.2 to J11.4 Buildings in purpose groups 2 to 7 — Building services (space heating and hot

water) — Space heating controls

Comment:

The systems are fitted with a thermostat which meets the requirements of Standard J5.2a. Systems having a capacity of more than 150 litres, and where the water is not heated by off-peak electricity, require a time switch that can start up and shut off the supply of heat. See the tinted areas of the

Hot

water storage and supply

section of the accompanying system

Detail Sheets.

Standards: J11.6 and J11.7 Buildings in purpose groups 2 to 7 — Building services (space heating and hot

water) — Insulation of pipes, ducts and vessels

Comment:

The storage vessels have a heat loss of not more than 90 Wm

⫺2

and thus satisfy these Standards.

Regulation: 27 Miscellaneous hazards Standard: P2.6 Danger from accident — Discharge of steam or hot water

Comment: The systems will satisfy the requirements of this Standard. See

section 16 of each system Detail Sheet.

Regulation: 28 Miscellaneous hazards Standard: P3.1 Danger from malfunction of an unvented hot water storage system — Unvented

hot water storage system

Comment:

The systems are constructed to prevent the temperature of the stored water at any time exceeding 100°C and to provide adequate protection from malfunctions of the system. See the tinted areas of the

Safety

section of the accompanying system

Detail Sheets.

3 The Building Regulations (Northern Ireland) 2000

In the opinion of the BBA, the position of Kwikot Unvented Hot Water

Storage Systems, if used in accordance with the provisions of this

Certificate, will satisfy or contribute to satisfying the various Building Regulations as listed below.

Regulation: B2 Fitness of materials and workmanship

Comment:

The systems are acceptable.

Regulation: F3 Space heating, hot water supply and artificial lighting systems

Comment:

The systems are fitted with a thermostat meeting the requirements of this Regulation. To comply with the deemed-to-satisfy provision set out in Technical Booklet F : 1991

Conservation of fuel and power

Section 2, systems having a capacity of more than 150 litres, and where the water is heated by means other than off-peak electricity, must be used in conjunction with a time switch to shut off the supply of heat when the building is not occupied. See the tinted areas of the

Hot water storage and supply

section of the

accompanying system Detail Sheets.

Regulation: F4 Insulation of pipes, ducts and hot water storage vessels

Comment:

The systems will satisfy the requirements of this Regulation.

Regulation: P5 Unvented hot water storage systems

Comment:

The systems incorporate suitable safety devices to meet the requirements of this Regulation. See the tinted areas of the

Safety

section of the accompanying system Detail Sheets.

Regulation: P6 Deemed-to-satisfy provision for an unvented hot water storage system

Comment:

The systems will meet the deemed-to-satisfy provisions of Regulation P6.

• It is essential, for reasons of safety and performance, that the systems are installed and maintained in accordance with this Certificate.

These Front sheets must be read in conjunction with the accompanying Detail Sheets which provide information on components and the different systems.

continued

Electronic Copy

4 Construction (Design and Management) Regulations 1994 (as amended)

Construction (Design and Management) Regulations (Northern Ireland) 1995 (as amended)

Information in this Certificate may assist the client, planning supervisor, designer and contractors to address their obligations under these Regulations.

See sections:

Delivery and site handling

, 6

Safety

, 7

Properties in relation

to fire,

Maintenance

and 17

Installation procedure

of the

relevant Detail Sheets.

5 The Health and Safety at Work etc Act 1974 and the Health and Safety at Work (Northern Ireland) Order 1978

In buildings subject to this Act and Order, regular maintenance is a requirement. See section 12 of each system Detail Sheet.

6 Water Supply (Water Fittings) Regulations 1999 England and Wales, Water Byelaws 2000, Scotland and the Water Regulations, Northern Ireland

England and Wales

The product satisfies the requirements of the water regulations, if used and installed in accordance with this Certificate.

Scotland

The product satisfies the requirements of the water byelaws, if used and installed in accordance with this Certificate.

Northern Ireland

The product satisfies the requirements of the water regulations, if used and installed in accordance with this Certificate.

7 The Electrical Equipment (Safety) Regulations 1994 and the Electromagnetic Compatibility Regulations 1994

These Regulations implement the Low Voltage Directive 73/23/EEC (as amended by the CE Marking Directive 93/68/EEC) and the Electromagnetic Compatibility Directive 89/336/EEC and require manufacturers to carry out assessment of their products against the criteria given in the Directives. Declarations of Conformity have been provided by Kwikot Limited. The BBA has not assessed the product for compliance with these Directives.

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Bibliography

BS 6700 : 1997

Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages

Conditions of Certification

8 Conditions

8.1 This Certificate: (a) relates only to the product that is described,

installed, used and maintained as set out in this Certificate;

(b) is granted only to the company, firm or person identified on the front cover — no other company, firm or person may hold or claim any entitlement to this Certificate;

whole document — it may be misleading and will be incomplete to be selective;

(e) is copyright of the BBA; (f) is subject to English law.

8.2 References in this Certificate to any Act of Parliament, Regulation made thereunder, Directive or Regulation of the European Union, Statutory Instrument, Code of Practice, British Standard, manufacturers’ instructions or similar publication, are references to such publication in the form in which it was current at the date of this Certificate.

8.3 This Certificate will remain valid for an unlimited period provided that the product and the manufacture and/or fabrication including all related and relevant processes thereof:

(a) are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA;

(b) continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine; and

8.4 In granting this Certificate, the BBA is not responsible for:

(a) the presence or absence of any patent, intellectual property or similar rights subsisting in the product or any other product;

(b) the right of the Certificate holder to market, supply, install or maintain the product; and

(c) the actual works in which the product is installed, used and maintained, including the nature, design, methods and workmanship of such works.

8.5 Any recommendations relating to the use or installation of this product which are contained or referred to in this Certificate are the minimum standards required to be met when the product is used. They do not purport in any way to restate the requirements of the Health & Safety at Work etc Act 1974, or of any other statutory, common law or other duty which may exist at the date of this Certificate or in the future; nor is conformity with such recommendations to be taken as satisfying the requirements of the 1974 Act or of any present or future statutory, common law or other duty of care. In granting this Certificate, the BBA does not accept responsibility to any person or body for any loss or damage, including personal injury, arising as a direct or indirect result of the installation and use of this product.

In the opinion of the British Board of Agrément, Kwikot Unvented Hot Water Storage Systems are fit for their intended use provided they are installed, used and maintained as set out in this Certificate. Certificate No 96/3253 is accordingly awarded to Kwikot Limited.

On behalf of the British Board of Agrément

Date of Third issue: 10th September 2004 Chief Executive

*Original Front Sheets issued 23rd September 1996. This amended version includes change of product name, and reference to the revised national Building Regulations, Water Supply Regulations, Construction (Design and Management) Regulations, and new

Conditions of Certification

British Board of Agrément

P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA

Fax: 01923 665301

For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline

01923 665400

or check the BBA website.

e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk

Electronic Copy

Readers are advised to check the validity of this Detail Sheet by either referring to the BBA’s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).

• THIS DETAIL SHEET LISTS THE COMPONENTS APPROVED FOR USE ON KWIKOT UNVENTED HOT WATER STORAGE SYSTEMS.

• Each product Detail Sheet lists the components that are required to be factory fitted and others which are supplied separately for fitting by the installer.

• The BBA has assessed each of the components as suitable for purpose.

This Detail Sheet must be read in conjunction with the Front Sheets and the relevant Detail Sheets.

Component Manufacturer/supplier Setting Size

and component number

Line strainer Reliance Water — ¾”

Controls LS75

Pressure reducing valve Reliance 312 3 bar ¾”

Watts Redupress 3 bar ¾”

Combined check valve Reliance 2014 5 bar ½” and expansion valve

Combined temperature and Reliance Water 90°C/7 bar ½” pressure relief valve Controls HT55 EVR

Watts SFR 52550UK 90°C/6 bar ¾”

Expansion vessel Altechnic Zilmet 3 bar 16 litres

Tundish Reliance Water Controls — 22 mm to 28 mm

Immersion heater Redring LU11TC 35° to 75°C 2¼”

Thermtec AFSTA-327 35° to 70°C 2¼”

Thermostat non-self-resetting Integral part of 80°C thermal cut-out immersion heater

Indirect thermostat IMIT LSC2 35° to 80°C

Indirect non-self-resetting IMIT LSC1-T80 85°C thermal cut-out

Motorised valve

(1)

Honeywell V4043 Danfoss DMV2C Sunvic SZV2212F

(1) It is essential on indirectly heated systems that the motorised valve supplied with the system is installed and is not substituted by any

other motorised valve which may exist and be in service at the site of installation, eg a motorised valve installed in a central heating circuit.

Certificate No 96/3253

DETAIL SHEET 2

Second issue*

Kwikot Limited

KWIKOT UNVENTED HOT WATER STORAGE SYSTEMS

Components

CI/SfB

(53.9) X

Electronic Copy

On behalf of the British Board of Agrément

Date of Second issue: 10th September 2004 Chief Executive

*Original Detail Sheet issued 23rd September 1996. This revised version includes change of product name and reference to the Watts valves and Thermtec immersion heater.

British Board of Agrément

P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA

Fax: 01923 665301

For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline

01923 665400

or check the BBA website.

e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk

Electronic Copy

Readers are advised to check the validity of this Detail Sheet by either referring to the BBA’s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).

Technical Specification

1 Description

1.1 The Kwikot Direct Unvented Hot Water Storage System is for use in domestic, commercial and public buildings for connection to domestic hot and cold water services to BS 6700 : 1997, and comprises the components shown in Figure 1. The storage capacities and main dimensions are listed in Table 1.

1.2 The system generally comprises a steel storage cylinder, enamelled on the interior surfaces and factory fitted with two 3 kW immersion heaters. The models are for free-standing installations.

1.3 The cylinder is insulated with polyurethane (PU) hard foam and covered with a white, epoxy-coated steel sheet.

1.4 For safety of the system, electrical control devices and the combined temperature and pressure relief valve are factory fitted. Other components are supplied separately for fitting on site by a

competent person

(see Figure 1 and

section 2.1).

1.5 Factory production control is exercised during the manufacture and assembly of each of the components including visual examination,

dimensional checks and performance tests. Each storage cylinder is pressure tested and examined for leaks during manufacture and prior to dispatch.

2 Delivery and site handling

2.1 The system is delivered in a cardboard carton protected internally with polystyrene supports and wrapped in a plastic bag. The following items (see also Detail Sheet 2) are supplied separately with each storage cylinder for fitting on site by a

competent person

, all other components are

factory fitted:

• cold water control valves — to include a pressure control valve (pressure limiting or pressure reducing valve)

• check valve

• expansion valve

• line strainer

• tundish.

2.2 When the system is required to be stored, it

must be stored in a dry environment and protected from damage.

2.3 The system must be carefully handled and

kept in the delivery crate until required for siting in position. The weight of each system empty and full is stated in Table 1 and on the label attached to each system.

• THIS DETAIL SHEET RELATES TO THE KWIKOT DIRECT UNVENTED HOT WATER STORAGE SYSTEM, WITH A RANGE OF CAPACITIES FROM 150 TO 210 LITRES, A NOMINAL OPERATING PRESSURE OF

3.0 BAR AND FITTED WITH TWO 3 kW IMMERSION HEATERS.

• The system is for use with mains or other suitable potable water supply pressures up to and including 12 bar.

• Satisfactory outlet flow rates can only be achieved where the flow rate available at the entry to the system is adequate (see section 5 of this Detail Sheet).

• It is essential, for reasons of safety and performance, that the product is installed and maintained in accordance with the requirements of this Detail Sheet by a

competent person

(see section 12, regarding

Maintenance

and section 15 for the definition of a

competent person

This Detail Sheet must be read in conjunction with the Front Sheets and Detail Sheet 1, which give the

Conditions of Certification

and the product’s position

regarding the Building Regulations, respectively.

Certificate No 96/3253

DETAIL SHEET 3

Second issue*

Kwikot Limited

KWIKOT DIRECT UNVENTED HOT WATER STORAGE SYSTEM

Product

CI/SfB

(53.3) X

Electronic Copy

3 Labelling/marking

The system carries a label(s) bearing the information set out in Table 2 and is supplied with a comprehensive installation/user manual.

Figure 1 General layout

Key to Figure 1

1 Storage cylinder manufactured from 2 mm thick steel.

2 Combined temperature and pressure relief valve (see Detail Sheet 2).

Factory fitted.

3 Expansion vessel.

4 Insulation (PU foam) covered by white, epoxy-coated steel outer casing.

5 Corrosion protection magnesium alloy anode.

6 Cold water feed (¾” BSP male).

7 Hot water draw-off (¾” BSP female).

8 Drain valve to BS 2879 : 1980.

9 Immersion heater.

10 Cold water control valves (see Detail Sheet 2):

line strainer check valve expansion valve pressure reducing valve.

Table 1 Storage capacities and dimensions

Manufacturer’s system

reference

150 210 Storage capacity (litres) 150 210 Cylinder size (mm)

height 1036 1382 diameter 450 450 overall height 1090 1436 overall diameter 525 525

Weight of cylinder (kg)

empty 50 67

full 200 277 Expansion vessel capacity (litres) 16 16 Connection sizes

mains water supply to control valves —

(mm) compression fitting 22 22

balanced cold water draw-off —

(mm) compression fitting 22 22

cold water inlet to storage cylinder —

(BSP inches male) ¾ ¾ hot water draw-off — (BSP inches male) ¾ ¾ expansion valve discharge —

(BSP inches male) ½ ½ temperature and pressure relief valve

discharge — (BSP inches female) ½ ½

Immersion heater

rating at 240 V (kW) 3 3 heater length (mm) 280 280

Anode length (mm) 370 480

Table 2 Labels

General

1 The BBA identification mark incorporating the number of this Certificate.

2 The system uses BEAB (British Electrical Approvals Board) approved

electrical controls. 3 UKWFBS (United Kingdom Water Fittings Byelaws Scheme) list number. 4 Manufacturer’s name. 5 Product code number. 6 Serial number. 7 The system is an unvented system.

Design

1 Maximum water supply pressure (bar). 2 Operating pressure (bar). 3 Expansion valve setting (bar). 4 Immersion heater(s) — Power/voltage — Type/BS/Length. 5 Storage capacity (litres). 6 Weight of unit — full (kg). 7 Expansion vessel charge pressure (bar).

Safety warnings/conditions

1 Installation to be carried out only by a

competent person.

2 The removal/replacement of any component to be carried out only by a

competent person

using components supplied by the Certificate holder in

accordance with their instructions. 3 Any malfunction of the system such as that resulting in discharge of water

from the expansion valve or the combined temperature and pressure relief

valve to be reported to a

competent person

after switching off the heat

source and prior to any further use of the system. 4 The installation of the system is subject to approval under the Building

Regulations, Water Byelaws and Regulations, the Health and Safety at

Work etc Act 1974 (where appropriate) and the Health and Safety at

Work (Northern Ireland) Order 1978 (where appropriate).

Installer

(1)

details

1 Space for:

(a) Name

(b) Address

(d) Completion date

(e) Registration No ....

2 A declaration that installation has been in accordance with BBA

Certificate

No 96/3253 with space for signature of the installer

(1)

CE mark

1 The system complies with the Low Voltage Directive 73/23/EEC. 2 The system when installed correctly will comply with the Electromagnetic

Compatibility Directive 89/336/EEC. 3 A CE mark applied to these products by the manufacturer relates only to the

Low Voltage and Electromagnetic Compatibility Directive. In the opinion of

the BBA, the application of the CE mark does not infer compliance with the

requirements of the applicable Building Regulations.

(1) The installer must meet the definition of a

competent person

as defined in section 15.2.

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Table 4 Standing energy losses

System ref Heat loss Energy loss

(1)

maximum daily

(W) (kWh)

D 150 100 2.40

D 210 113 2.71

(1) These figures relate to a 45°C differential between the stored water and

ambient temperature.

Design Data

4 General

4.1 The Kwikot Direct Unvented Hot Water Storage System (see Figure 2) has been assessed in accordance with MOAT No 38 : 1986. When used in accordance with this Detail Sheet the system will perform in a safe and satisfactory manner.

4.2 The hot water system capacity should be selected in accordance with the recommendations of BS 6700 : 1997, to meet the demands required from the installation.

4.3 The pressure and flow available from the water mains should be obtained from the local water undertaker or by testing existing supplies to establish the likely performance of the system at peak periods.

4.4 It is essential, for reasons of safety and performance, that installation of the system is undertaken only by a

competent person

working in

accordance with this Detail Sheet.

4.5 The data shown in Tables 3 and 4 represent the analysis of tests carried out by the BBA.

5 Hot water storage and supply

Hot water storage

5.1 The capacities of the system range are comparable with conventional systems (see Table 1). When heated to 60°C the system can supply 70% of the storage capacity at the mean temperature given in Table 3.

Flow rates

5.2 The flow rates achieved at the hot water draw-off point will depend on all the normal factors including the layout of the pipework from the tap to

Figure 2 Schematic layout — direct

Table 3 Heating, re-heating and water draw-off temperature

ABCDEF

System Heat source Heat-up Percentage of the capacity Mean Reheating Upper Quantity

ref immersion time and amount drawn off within draw-off time immersion available

heater 10°C of set temperature temperature heat-up above

time 40°C

(kW) (minutes) (%) (litres) (°C) (minutes) (minutes) (litres)

D 150 3 187 90 135 60 152 54 51

D 210 3 250 93 195 60 177 60 56

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the cylinder, the cold water supply pressure and the flow rate available at the supply to the system.

5.3 For design purposes the graphs in Figure 3 show the relationship between:

• flow available

• mains supply pressure, and

• the maximum hot water flow rate out of the system

(1)

(1) Flow characteristics shown in the graphs reflect the worst

combination of cold water control components that may be installed (see Detail Sheet 2).

5.4 The hot/cold mixed flows are for draw-off

temperatures of 40°C (assume 60% at 60°C and 40% at 10°C).

Heat-up, re-heating and hot water draw-off temperature

5.5 The heat-up and re-heat times are comparable

with conventional systems of a similar size supplying hot water.

5.6 The immersion heater will heat the stored

water from 15°C to 60°C in the time listed in column A of Table 3.

5.7 The amount of water that can be drawn off

within 10°C of the set temperature is listed in column B of Table 3, the mean temperature of 70% of the water drawn off immediately after reaching 60°C in column C, and the time taken to re-heat the stored water to 60°C in column D.

Temperature control

5.8 The thermostat wired to the immersion heater is satisfactory for controlling the temperature of the stored water.

Pressure control

5.9 The pressure control valve is satisfactory for

controlling the pressure of the water supplied from the water mains or other suitable potable supply.

Insulation

5.10 The system is provided with adequate insulation to satisfactorily limit the energy loss

from the stored water and meets the requirements described in the national Building Regulations:

England and Wales

Approved Document L1

Scotland

Regulation 22, Standard J3.4

Northern Ireland

Technical Booklet F, Paragraph 3.3.

5.11 The heat loss of each system while maintaining the temperature of the stored water at 65°C is shown in Table 4.

Figure 3 Flow rates

Connections

5.12 The system is designed to be connected to copper tube to BS EN 1057 : 1996, using conventional plumbing fittings (see Table 1 for details of connection sizes and threads). The connections are of adequate size.

6 Safety

Excessive temperature — Prevention of explosion — Safe discharge of hot water

6.1 The safety devices provided to ensure that the temperature of the stored water will not exceed 100°C, and safeguard the

operation of the system, are:

• the combined temperature and pressure relief valve, and

• the non-self-resetting thermal cut-out fitted to the system and wired to the immersion heater.

6.2 The system has a safety warning label

attached to the storage cylinder, bearing an explanation of the action to be taken in the case of

20 30 40 50 60

2 bar

3 bar

4 bar

8 bar

Static supply pressures of incoming water supply

flow available (lmin ) at entry to system

–1

flow out (lmin ) of the system

–1

hot only

¾" valves

01020304050

60 70 80

flow available at entry to the system(lmin )

–1

8 bar 4 bar 3 bar 2 bar

Static supply pressures of incoming water supply

flow out (lmin ) of the system

–1

• Flow rates shown apply to situations where the supply is capable of supplying an adequate dynamic pressure.

• The graph represents the results of tests carried out by the BBA.

• Where static water supplies are less than 1 bar, consult Kwikot Limited or the BBA.

• Flow rates shown for mixed hot/cold water assume that the cold supply is not

taken from the balanced connection of the pressure reducing valve

Notes

hot/cold mixed

mixed water at 40ºC, mixed from 60% hot water at 60ºC and 40% cold water at 10ºC

¾" valves

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any malfunction of the system. It is essential that the instructions are followed.

6.3 The system has adequate provision for safe disposal of discharges from the expansion valve and the combined temperature and pressure relief valve [see also sections 16(2) and (3)].

Physical contact

6.4 The surfaces of the storage cylinder are protected by the insulation. In normal use the temperatures of the surfaces of the various parts of the system are comparable with those in a conventional, vented, hot water storage system.

Strength and stability

6.5 The system has adequate resistance to internal pressures and does not visibly deform when subjected to a vacuum of 0.1 bar absolute.

6.6 The system’s pressure control devices will ensure that the operating pressure will be controlled to a nominal 3 bar and that the design pressure of 5 bar is not exceeded. Each storage cylinder has been satisfactorily pressure tested to 1.5 times the design pressure, ie 7.5 bar.

6.7 The weight of the system is stated on the label attached (see also Table 1); the support arrangements appropriate to a conventional system apply.

6.8 Care must be taken to avoid damage to the system during handling and installation.

Electrical safety

6.9 The thermostat and non-self-resetting thermal cut-out are approved by the BEAB to BS 3955 :

1986. The immersion heater is approved by the BEAB to BS EN 60335-2.73 : 2003. To ensure safety it is essential that the electrical wiring is carried out in accordance with the

IEE Wiring Regulations — Regulations for Electrical Installations, Sixteenth Edition 1991.

7 Properties in relation to fire

7.1 The expanded polyurethane foam insulant is covered with a steel outer casing and only a small area of the insulant will be exposed at connection bosses. In the presence of a source of ignition, such as a plumber’s blowlamp, the foam will flame locally and emit toxic fumes. Flaming and fume emission will stop when the source of ignition is removed.

7.2 In service, the steel outer casing encloses the foam and risk of ignition will be minimal. During installation care should be exercised when using a blowlamp to make soldered joints on pipework adjacent to the cylinder. Installation does not require soldered joints to be made direct to the system.

8 Effect on water quality and prevention of waste of water

The system is listed by the UKWFBS.

9 Watertightness

The storage cylinder remains watertight at pressures

in excess of 1.5 times the design pressure,

ie 7.5 bar.

10 Noise

The system is quiet in normal operation, the flow of water being via conventional water pipe fittings, and compares favourably with a vented, hot water storage system.

11 Physiological effects

The insulation is a conventional material. It will not encourage vermin or bacteria and is not susceptible to damage from moisture.

12 Maintenance

12.1 It is recommended that, annually, a

competent person

• inspects and cleans the line strainer, and

• measures the pressure in the expansion vessel

and recharges as necessary.

12.2 The replacement or servicing of components must be carried out by a competent person, using the

Kwikot Technical Information and Installers

Instructions

, or by the Certificate holder under their responsibility as the product manufacturer, including that required by their warranty, using components supplied by the Certificate holder.

12.3 The system may be drained using the drain valve.

12.4 When the system is used in buildings subject to the Health and Safety at Work etc Act 1974, an inspection of the system must be carried out every six months.

13 Site checks

On site the following should be checked:

By the Client

(1) The installer is a

competent person

— by

reference to his/her identity card.

(2) The system being installed is BBA Certificated — by reference to the label.

(3) That the installation complies with the BBA Certificate — by reference to the installer’s signature on the label attached to the cylinder.

By the Building Control Officer or Approved Inspector

(1) 1, 2 and 3 as above.

(2) The combined temperature and pressure relief valve, thermostat, non-self-resetting thermal cut-out and the immersion heater are as described in the Certificate.

(3) The tundish and discharge pipework are correctly located and fitted.

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14 Durability

The system is manufactured from durable materials and conventional plumbing components and will have a life equal to that expected of a vented system. It may be necessary to replace some of the system components, eg the immersion heater, thermostat (see section 12.2 and Detail Sheet 2).

Installation

15 The installer

15.1 It is essential, for reasons of safety and performance, that the installation, commissioning and maintenance of the system is carried out by a person with suitable training and practical experience. However, the assessment of training arrangements and continuing competence of installers falls outside the scope of this Certificate.

15.2 It is the view of the Department of the Environment, and stated in its Approved

Document G3, that, to meet the requirements of the Building Regulations (England and Wales) concerned with unvented hot water storage systems, installations should be undertaken by a

competent person

, defined as ‘one holding a current Registered Operative Identity Card for the installation of unvented domestic hot water storage systems, issued by the Construction Industry Training Board (CITB), the Institute of Plumbing, the Association of Installers of Unvented Hot Water Systems (Scotland and Northern Ireland), or an equivalent body’.

15.3 In Scotland, it is the requirement of the deemed-to-satisfy provision to Technical Standard P3.1

Unvented Hot Water

Storage System

for compliance with Regulation 28 of the Building Standards (Scotland) Regulations that such systems be ‘in the form of a proprietary unit or package which is: (i) the subject of a BBA Certificate, or (ii) Kitemarked to BS 7206 : 1990’. The Standard contains no specific requirements for installers but the Certificates referred to state that installation must be undertaken by a

competent person

, as defined in

section 15.2.

15.4 In Northern Ireland, it is the requirement of Regulation P5

Unvented

Hot Water Storage Systems

that systems with a capacity not greater than 500 litres, and a heat input not greater than 45 kW, be certified as meeting the relevant requirements of Regulation P5 by a member body of EOTA operating a Technical Approvals Scheme, eg by the BBA under MOAT No 38 : 1986. Agrément Certificates will refer to a need for installation by a

competent person

, as defined in

section 15.2.

16 Conditions

The following conditions abstracted from the Certificate holder’s instructions must be observed:

(1) The system must be connected to a water supply with a pressure not exceeding 12 bar and of a quality supplied by a water undertaker under the Water Byelaws and Water Regulations, as appropriate.

(2) The combined temperature and pressure relief valve tundish must be in a clearly visible position within 500 mm of the cylinder and in the same compartment as the cylinder. The discharge pipe to and from the tundish must be of metal and laid to fall. It must terminate at a visible safe place, such as a gully, where there is no risk of contact with the hot water by persons in or about the building. Further details are given in BBA Information No 33 : 1989

Unvented Hot Water Storage Systems — Hot Water Discharges from Safety Devices. BBA Requirements and Guidance.

(3) The discharge pipe from the expansion valve should be laid with a continuous fall to terminate in a suitable location. The details applying to discharge pipes given in BBA Information No 33 : 1989 are generally recommended.

(4) The system is installed in locations similar to those for storage cylinders used in a conventional vented system or in other locations advantageous to the building designer (see Table 1 for load weight of the system when ‘full’). It is important to ensure there is adequate clearance for the removal of the immersion heater and the corrosion protection anode (see Table 1).

(5) Electrical wiring must be carried out in accordance with the IEE Wiring Regulations. The immersion heater circuit must be protected by a suitably-rated fuse and an isolating switch with double pole disconnection.

17 Procedure

Summary of installation procedure

17.1 The storage cylinder is located in position (see the

Kwikot Technical Information and Installers

Instructions

and the plumbing connections made to the inlet and outlet pipes in the same manner as for a conventional storage cylinder, except that the water supply pipe is taken directly from the mains or other suitable potable supply, via the line strainer and cold water control valves (ensuring the arrow markings on the components are pointing downstream) to the cold water inlet of the storage cylinder (see Figure 2). Where balanced pressures are required, the cold water draw-off is connected as shown in Figure 2, using components supplied by the Certificate holder.

17.2 The discharge pipe is connected to and from the tundish to a safe and visible termination point [see sections 16(2) and (3)]. The air gap at the tundish must remain clear.

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18 Commissioning

18.1 The system is filled with water and checked for watertightness. The expansion vessel is checked against the manufacturer’s stated specification (3.5 bar). The expansion valve and the combined temperature and pressure relief valve are manually operated to ensure water discharge from the valves runs freely through the tundish to the termination point. The valves are visually checked to ensure that they re-seat satisfactorily. Heat is applied to the system and is allowed to reach normal working temperature. The operation of the thermostat is checked and an examination carried out to ensure that no water has discharged from the expansion valve or the combined temperature and pressure relief valve during the heat-up.

18.2 On completion of the commissioning process the

competent person

completes the label attached to the system, stating that the installation complies with the Certificate (see section 3).

Technical Investigations

The following is a summary of the technical investigations carried out on the Kwikot Direct Unvented Hot Water Storage System.

19 Tests and investigations

19.1 Tests were carried out in accordance with MOAT No 38 : 1986 to determine:

• capacity of storage cylinder

• dimensional accuracy

• mean supply temperature

• outlet flow rate at various supply flow rates and

pressures

• time taken to heat to 60°

• re-heat time to 60°

• standing energy loss (adequacy of insulation)

• watertightness

• resistance of the storage cylinder and expansion

vessel to an internal hydrostatic pressure of

1.5 times the design pressure = 7.5 bar

• resistance to partial vacuum of 0.1 bar absolute

• flow capacity of the tundish and discharge

pipework.

19.2 Tests were carried out to confirm satisfactory operation of the following components when fitted in a system:

• cold water control valves, to include: – pressure control valve

– expansion valve – check valve

• combined temperature and pressure relief valve

•

immersion heater thermostat and non-self-resetting t

hermal cut-out

• line strainer.

19.3 An examination was made of existing data

in relation to the performance requirements of the relevant British Standards, to determine the suitability and performance of:

• cold water control valves, to include: – pressure control valve to BS 6283-4 : 1991 – check valve to BS 6282-1 : 1982 – expansion valve to BS 6283-1 : 1991

• combined temperature and pressure relief valve

to BS 6283-3 : 1991

• line strainer

• immersion heater to BS EN 60335-2.73 : 2003

• direct immersion heater

thermostat/non-self-resetting thermal cut-out to BS 3955 : 1986

• expansion vessel to BS 6144 : 1990.

19.4 An examination was made of existing data

relating to:

• adequacy of installation instructions

• practicability of installation by the

competent

person

• electrical safety

• effect on water quality and prevention of waste

of water

• properties in relation to fire

• practicability and adequacy of maintenance

requirements

• durability of materials used.

20 Investigations

The manufacturing and assembly process was examined, including the methods adopted for quality control, and details were obtained of the quality and composition of materials used.

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Bibliography

BS 2879 : 1980

Specification for draining taps

(screw-down pattern)

BS 3955 : 1986

Specification for electrical

controls for household and similar general purposes

BS 6144 : 1990

Specification for expansion vessels using an internal diaphragm, for unvented hot water supply systems

BS 6282-1 : 1982

Devices with moving parts for the prevention of contamination of water by backflow — Specification for check valves of nominal size up to and including DN 54

BS 6283-1 : 1991

Safety and control devices for use in hot water systems — Specification for expansion valves for pressures up to and including 10 bar

BS 6283-3 : 1991

Safety and control devices for use in hot water systems — Specification for combined temperature and pressure relief valves for pressures from 1 bar to 10 bar

BS 6283-4 : 1982

Safety and control devices for use in hot water systems — Specification for droptight pressure reducing valves of nominal size up to and including DN 54 for supply pressures up to and including 12 bar

BS 6700 : 1997

Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages

BS 7206 : 1990

Specification for unvented hot water storage units and packages

BS EN 1057 : 1996

Copper and copper alloys. Seamless, round copper tubes for water and gas in sanitary and heating applications

BS EN 60335-2.73 : 2003

Household and similar electrical appliances — Safety — Particular requirements for fixed immersion heaters

MOAT No 38 : 1986

The assessment of unvented hot water storage systems and the approval and surveillance of installers

On behalf of the British Board of Agrément

Date of Second issue: 10th September 2004 Chief Executive

*Original Detail Sheet issued 23rd September 1996. This revised version includes change of product name and reference to revised Regulations and Standards.

British Board of Agrément

P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA

Fax: 01923 665301

For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline

01923 665400

or check the BBA website.

e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk

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Readers are advised to check the validity of this Detail Sheet by either referring to the BBA’s website (www.bbacerts.co.uk) or contacting the BBA direct (Telephone Hotline 01923 665400).

Technical Specification

1 Description

1.1 The Kwikot Indirect Unvented Hot Water Storage System is for use in domestic, commercial and public buildings for connection to domestic hot and cold water services to BS 6700 : 1997, and comprises the components shown in Figure 1. The storage capacities and main dimensions are listed in Table 1.

1.2 The system generally comprises a steel storage cylinder enamelled on the interior surfaces and factory fitted with an externally enamelled, steel coil heat exchanger and a 3 kW immersion heater for use as direct secondary back-up. The system is for free-standing installation and connects to a cold feed supply as indicated in Table 1.

1.3 The cylinder is insulated with polyurethane (PU) hard foam and covered with a white, epoxycoated steel sheet.

1.4 For safety of the system, electrical control devices and the combined temperature and pressure relief valve are factory fitted. Other components, including additional safety devices, are supplied separately for fitting on site by a

competent person

(see Figure 1 and section 2.1).

1.5 Factory production control is exercised during the manufacture and assembly of each of the components including visual examination, dimensional checks and performance tests. Each storage cylinder is pressure tested and examined for leaks during manufacture and prior to dispatch.

2 Delivery and site handling

competent person

, all other components are

factory fitted:

• cold water control valves — to include a

pressure control valve (pressure limiting or pressure reducing valve), check valve and an expansion valve

• line strainer

• indirect thermostat

• wiring box

• motorised valve

• tundish

• expansion vessel.

• THIS DETAIL SHEET RELATES TO THE KWIKOT INDIRECT UNVENTED HOT WATER STORAGE SYSTEM WITH A RANGE OF CAPACITIES FROM 125 TO 210 LITRES, A NOMINAL OPERATING PRESSURE OF 3 BAR AND FITTED WITH ONE 3 kW IMMERSION HEATER FOR DIRECT SECONDARY BACK-UP HEATING.

• The system is for use with mains or other suitable potable water supply pressures up to and including 12 bar.

• The system is for use with gas, electric or oil fired boilers.

• The system can be used with a vented or pressurised primary with a maximum primary pressure of 3 bar.

• Satisfactory outlet flow rates can only be achieved where the flow rate available at the entry to the system is adequate (see section 5 of this Detail Sheet).

• It is essential, for reasons of safety and performance, that the product is installed and maintained in accordance with the requirements of this Detail Sheet by a

competent person

(see section 12, regarding

Maintenance

and section 15 for the definition of a

competent person

This Detail Sheet must be read in conjunction with the Front Sheets and Detail Sheet 1, which give the

Conditions of Certification

and the product’s position

regarding the Building Regulations, respectively.

Certificate No 96/3253

DETAIL SHEET 4

Second issue*

Kwikot Limited

KWIKOT INDIRECT UNVENTED HOT WATER STORAGE SYSTEM

Product

CI/SfB

(53.3) X

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2.2 When the system is required to be stored, it must be stored in a dry environment and protected from damage.

2.3 The system must be carefully handled and kept in the delivery crate until required for siting in position. The weight of each system empty and full is stated in Table 1 and on the label attached to each system.

3 Labelling/marking

The system carries a label(s) bearing the information set out in Table 2 and is supplied with a comprehensive installation/user manual.

Figure 1 General layout

Key to Figure 1

1 Storage cylinder manufactured from 2 mm thick steel. 2 Combined temperature and pressure relief valve (see Detail Sheet 2).

Factory fitted. 3 Expansion vessel. 4 Insulation (PU foam), covered by white, epoxy-coated steel outer casing. 5 Corrosion protection magnesium alloy anode. 6 Cold water feed (¾” male BSP). 7 Hot water draw-off (¾” female BSP). 8 Drain valve to BS 2879 : 1980. 9 Motorised valve to BS 3955 : 1986 (see Detail Sheet 2).

10 Primary flow, ¾” BSP male threaded connection. 11 Primary return, ¾” BSP male threaded connection. 12 Indirect cylinder thermostat to BS 3955 : 1986 (adjustable between 30°C

and 80°C) (see Detail Sheet 2).

13 Indirect cylinder non-self-resetting thermal cut-out to BS 3955 : 1986

(operates at 85°C). Factory fitted.

14 Tundish, 22 mm compression fitting inlet, 28 mm compression fitting outlet

(both to BS 864-2 : 1983).

15 Immersion heater. 16 Steel coil heat exchanger. 17 Cold water control valves (see Detail Sheet 2):

line strainer

check valve

expansion valve

pressure reducing valve.

Table 1 Storage capacities and dimensions

Manufacturer’s system reference

125 150 210 Storage capacity (litres) 125 150 210 Cylinder size (mm)

height 892 1036 1382 diameter 450 450 450 overall height 946 1090 1436 overall diameter 525 525 525

Weight of cylinder (kg)

empty 63 70 87

full 188 220 297 Expansion vessel capacity (litres) 16 16 16 Connection sizes

mains water supply to control valves —

(mm) compression fitting 22 22 22

balanced cold water draw-off

(mm) compression fitting 22 22 22

cold water inlet to storage cylinder —

(BSP inches male) ¾ ¾ ¾ hot water draw-off — (BSP inches male) ¾ ¾ ¾ expansion valve discharge (BSP inches male) ½ ½ ½ temperature and pressure relief

valve discharge (BSP inches female) ½ ½ ½

Immersion heater

rating at 240 V (kW) 3 3 3 heater length (mm) 280 280 280

Anode length (mm) 325 370 480 Primary coil

diameter (mm) 22 22 22 heating surface area (m2) 1.09 1.09 1.09

Table 2 Labels

General

1 The BBA identification mark incorporating the number of this Certificate.

2 The system uses BEAB (British Electrical Approvals Board) approved

electrical controls. 3 UKWFBS (United Kingdom Water Fittings Byelaws Scheme) list number. 4 Manufacturer’s name. 5 Product code number. 6 Serial number. 7 The system is an unvented system.

Design

Safety warnings/conditions

1 Installation to be carried out only by a

competent person.

2 The removal/replacement of any component to be carried out only by a

competent person

using components supplied by the Certificate holder in

accordance with their instructions. 3 Any malfunction of the system such as that resulting in discharge of water

from the expansion valve or the combined temperature and pressure relief

valve to be reported to a

competent person

after switching off the heat

source and prior to any further use of the system. 4 The installation of the system is subject to approval under the Building

Regulations, Water Byelaws and Regulations, the Health and Safety at

Work etc Act 1974 (where appropriate) and the Health and Safety at

Work (Northern Ireland) Order 1978 (where appropriate).

Installer

(1)

details

1 Space for:

(a) Name

(b) Address

(d) Completion date

(e) Registration No ....

2 A declaration that installation has been in accordance with BBA

Certificate

No 96/3253 with space for signature of the installer

(1)

CE mark

1 The system complies with the Low Voltage Directive 73/23/EEC. 2 The system when installed correctly will comply with the Electromagnetic

Compatibility Directive 89/336/EEC. 3 A CE mark applied to these products by the manufacturer relates only to the

Low Voltage and Electromagnetic Compatibility Directive. In the opinion of

the BBA, the application of the CE mark does not infer compliance with the

requirements of the applicable Building Regulations.

(1) The installer must meet the definition of a

competent person

as defined in section 15.2.

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Table 4 Standing energy losses

System ref Heat loss Energy loss

(1)

maximum daily

(W) (kWh) 125 95 2.28 150 100 2.40 200 113 2.71

(1) These figures relate to a 45°C differential between the stored water and

ambient temperature.

Design Data

4 General

4.1 The Kwikot Indirect Unvented Hot Water Storage System (see Figure 2) has been assessed in accordance with MOAT No 38 : 1986. When used in accordance with this Detail Sheet the

system will perform in a safe and satisfactory manner.

4.2 The hot water system capacity, should be selected in accordance with the recommendations of BS 6700 : 1997, to meet the demands made upon the installation. The primary circuit pipework associated with indirect heating systems should be designed in accordance with BS 6700 : 1997 and BS 5449 : 1977. Particular consideration should be given to the inclusion of a primary circuit by-pass to prevent excessive pressure on the motorised valve and also safeguard against ‘nuisance tripping’ of the non-self-resetting thermal cut-out.

4.3 The pressure and flow available from the water mains should be obtained from the local water undertaker or by testing existing supplies to

Figure 2 Schematic layout — Indirect

Table 3 Heating, re-heating and water draw-off temperature

Indirect heating

AB CD

System Primary flow Heat-up Percentage of the capacity Mean Re-heating

ref time

(1)

and amount drawn off within draw-off time

10°C of set temperature temperature

(litres per minute) (minutes) (%) (litres) (°C) (minutes)

125 15 27 89 111 60 21 150 15 34 91 136 60 26 210 15 45 93 186 60 30

(1) These heat-up times apply to a pumped system only and assume a boiler of adequate output is connected to the system. Primary flows of 15 litres per

minute normally can be attained with a standard domestic circulating pump.

Direct heating

AB CD

System Heat source Heat-up Percentage of the capacity Mean Re-heating

ref time and amount drawn off within draw-off time

10°C of set temperature temperature

(kW) (minutes) (%) (litres) (°C) (minutes)

125 3 160 89 111 60 105 150 3 187 90 135 60 152 210 3 250 93 195 60 177

motorised valve

primary flow

cold water

control valves

expansion valve

tundish

discharge pipe to safe position [see section 16(3) and (4)]

combined temperature and pressure relief valve

drain valve

hot draw-off

check valve

balanced pressure cold draw-off

pressure control valve

cold feed

isolating valve

line strainer

expansion

vessel

anode

air bleed valve

primary return

indirect cylinder non-self-resetting thermal cut-out

steel coil heat exchanger

indirect cylinder thermostat

immersion heater, direct thermostat and non-self-resetting thermal cut-out

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establish the likely performance of the system at peak periods.

4.4 It is essential, for reasons of safety and performance, that installation of the system is undertaken only by a

competent person

working

in accordance with this Detail Sheet.

4.5 The data shown in Tables 3 and 4 represent the analysis of tests carried out by the BBA.

5 Hot water storage and supply

Hot water storage

Flow rates

5.2 The flow rates achieved at the hot water draw-off point will depend on all the normal factors including the layout of the pipework from the tap to the cylinder, the cold water supply pressure and the flow rate available at the supply to the system.

5.3 For design purposes the graphs in Figure 3 show the relationship between:

• flow available

• mains supply pressure, and

•

the maximum hot water flow rate out of the system

(1)

(1) Flow characteristics shown in the graphs reflect the worst

combination of cold water control components that may be installed (see Detail Sheet 2).

5.4 The hot/cold mixed flows are for draw-off temperatures of 40°C (assume 60% at 60°C and 40% at 10°C).

Heat-up, re-heating and hot water draw-off temperature

5.5 The heat-up and re-heat times are comparable with conventional systems of a similar size supplying hot water.

5.6 The immersion heater will heat the stored water from 15°C to 60°C in the time listed in column A of Table 3.

5.7 The amount of water that can be drawn off within 10°C of the set temperature is listed in column B of Table 3, the mean temperature of 70% of the water drawn off immediately after reaching 60°C in column C, and the time taken to re-heat the stored water to 60°C in column D.

Temperature control

5.8 The thermostats wired to the immersion heater and motorised valve are satisfactory for controlling the temperature

of the stored water.

Pressure control

5.9 The pressure control valve is satisfactory for controlling the pressure of the water supplied from the water mains or other suitable potable supply.

Figure 3 Flow rates

Insulation

5.10 The system is provided with adequate insulation to satisfactorily limit

the energy loss from the stored water and meets the requirements described in the national Building Regulations:

England and Wales

Approved Document L1

Scotland

Regulation 22, Standard J3.4

Northern Ireland

Technical Booklet F, Paragraph 3.3.

5.11 The heat loss of each system while maintaining the temperature of the stored water at 65°C is shown in Table 4.

20 30 40 50 60

2 bar

3 bar

4 bar

8 bar

Static supply pressures of incoming water supply

flow available (lmin ) at entry to system

–1

flow out (lmin ) of the system

–1

hot only

¾" valves

0 1020304050

60 70 80

flow available at entry to the system(lmin )

–1

8 bar 4 bar 3 bar 2 bar

Static supply pressures of incoming water supply

flow out (lmin ) of the system

–1

• Flow rates shown apply to situations where the supply is capable of supplying an adequate dynamic pressure.

• The graph represents the results of tests carried out by the BBA.

• Where static water supplies are less than 1 bar, consult Kwikot Limited or the BBA.

• Flow rates shown for mixed hot/cold water assume that the cold supply is not

taken from the balanced connection of the pressure reducing valve

Notes

hot/cold mixed

mixed water at 40ºC, mixed from 60% hot water at 60ºC and 40% cold water at 10ºC

¾" valves

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Connections

6 Safety

Excessive temperature — Prevention of explosion — Safe discharge of hot water

6.1 The safety devices provided to ensure that the temperature of the stored water will not exceed 100°C, and safeguard the

operation of the system, are:

For the indirect coil heat exchanger

• the combined temperature and pressure relief valve, and

• the indirect non-self-resetting thermal cut-out fitted to the system and wired into the motorised valve

(1)

For the direct immersion heater

• the combined temperature and pressure relief valve, and

• the direct non-self-resetting thermal cut-out fitted to the system and wired into the immersion heater.

(1) The motorised valve must be fitted to the primary flow and

appropriate electrical connections made (see sections 6.9 and 16).

6.2 The system has a safety warning label

attached to the storage cylinder, bearing an explanation of the action to be taken in the case of any malfunction of the system. It is essential that the instructions are followed.

6.3 The system has adequate provision for safe

disposal of discharges from the expansion valve and the combined temperature and pressure relief valve [see also sections 16(2) and (3)].

Physical contact

6.4 The surfaces of the storage cylinder are

protected by the insulation. In normal use the temperatures of the surfaces of the various parts of the system are comparable with those in a conventional, vented, hot water storage system.

Strength and stability

6.5 The system has adequate resistance to internal

pressures and does not visibly deform when subjected to a vacuum of 0.1 bar absolute.

6.6 The system’s pressure control devices will

ensure that the operating pressure will be controlled to a nominal 3 bar and that the design pressure of 5 bar is not exceeded. Each storage cylinder has been satisfactorily pressure tested to 1.5 times the design pressure, ie 7.5 bar.

6.7 The weight of the system is stated on the

label attached (see also Table 1); the support

arrangements appropriate to a conventional system apply.

6.8 Care must be taken to avoid damage to the system during handling and installation.

Electrical safety

6.9 The indirect thermostat, non-self-resetting thermal cut-out and motorised valve, and the direct thermostat and non-self-resetting thermal cut-out are approved by the BEAB to BS 3955 :

1986. The immersion heater is approved by the BEAB to BS EN 60335-2.73 : 2003. To ensure safety it is essential that the electrical wiring is carried out in accordance with the

IEE Wiring Regulations — Regulations for Electrical Installations, Sixteenth Edition 1991

7 Properties in relation to fire

7.1 The expanded polyurethane foam insulant is covered with a steel outer casing and only a small area of the insulation will be exposed at connection bosses. In the presence of a source of ignition, such as a plumber’s blowlamp, the foam will flame locally and emit toxic fumes. Flaming and fume emission will stop when the source of ignition is removed.

7.2 In service, the steel outer casing encloses the foam and risk of ignition will be minimal. During installation care should be exercised when using a blowlamp to make soldered joints on pipework

adjacent to the cylinder. Installation

does not require

soldered joints to be made direct

to the system.

8 Effect on water quality and prevention of waste of water

The system is listed by the UKWFBS.

9 Watertightness

The storage cylinder remains watertight at pressures

in excess of 1.5 times the design pressure,

ie 7.5 bar.

10 Noise

The system is quiet in normal operation, the flow of water being via conventional water pipe fittings, and compares favourably with a vented, hot water storage system.

11 Physiological effects

The insulation is a conventional material. It will not encourage vermin or bacteria and is not susceptible to damage from moisture.

12 Maintenance

12.1 It is recommended that, annually, a competent person:

• inspects and cleans the line strainer, and

• measures the pressure in the expansion vessel

and recharges as necessary.

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12.2 The replacement or servicing of components must be carried out by a competent person, using the

Kwikot Technical Information and Installers

Instructions

, or by the Certificate holder under their responsibility as the product manufacturer, including that required by their warranty, using components supplied by the Certificate holder.

12.3 The system may be drained using the drain valve.

12.4 When the system is used in buildings subject to the Health and Safety at Work etc Act 1974, an inspection of the system must be carried out every six months.

13 Site checks

On site the following should be checked:

By the Client

(1) The installer is a competent person — by reference to his/her identity card.

(2) The system being installed is BBA Certificated — by reference to the label.

(3) That the installation complies with the BBA Certificate — by reference to the installer’s signature on the label attached to the cylinder.

By the Building Control Officer or Approved Inspector

(1) 1, 2 and 3 as above. (2) The combined temperature and pressure relief

valve, thermostats, non-self-resetting thermal cut-outs, motorised valve and the immersion heater are as described in the Certificate.

(3) The tundish and discharge pipework are correctly located and fitted.

14 Durability

Installation

15 The installer

15.2 It is the view of the Department of the Environment, and stated in its Approved

Document G3, that, to meet the requirements of the Building Regulations (England and Wales) concerned with unvented hot water storage

systems, installations should be undertaken by a

competent person

15.3 In Scotland, it is the requirement of the deemed-to-satisfy provision to Technical Standard P3.1

Unvented Hot Water Storage

System

for compliance with Regulation 28 of the Building Standards (Scotland) Regulations that such systems be ‘in the form of a proprietary unit or package which is: (i) the subject of a BBA Certificate; or (ii) Kitemarked to BS 7206 : 1990’. The Standard contains no specific requirements for installers but the Certificates referred to state that installation must be undertaken

by a competent

person, as defined in section 15.2.

15.4 In Northern Ireland, it is the requirement of Regulation P5

Unvented Hot

Water Storage Systems

competent person

, as

defined in section 15.2.

16 Conditions

The following conditions abstracted from the Certificate holder’s instructions must be observed:

(1) The system is for connection to oil, electric or gas fired boilers.

(2) The system must be connected to a water supply with a pressure not exceeding 12 bar and of a quality supplied by a water undertaker under the Water Byelaws and Water Regulations, as appropriate.

(3) The combined temperature and pressure relief valve tundish must be in a clearly visible position within 500 mm of the cylinder and in the same compartment as the cylinder. The discharge pipe to and from the tundish must be of metal and laid to fall. It must terminate at a visible safe place, such as a gully, where there is no risk of contact with the hot water by persons in or about the building. Further details are given in BBA Information No 33 : 1989

Unvented Hot Water Storage Systems — Hot Water Discharges from Safety Devices. BBA Requirements and Guidance

(4) The discharge pipe from the expansion valve should be laid with a continuous fall to terminate in a suitable location. The details applying to

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discharge pipes given in BBA Information No 33 : 1989 are generally recommended.

(5) The system is installed in locations similar to those for storage cylinders used in a conventional vented system or in other locations advantageous to the building designer (see Table 1 for load weight of the system when ‘full’). It is important to ensure there is adequate clearance for the removal of the immersion heater and the corrosion protection anode (see Table 1).

(6) Electrical wiring must be carried out in accordance with the IEE Wiring Regulations. The immersion heater circuit must be protected by a suitably-rated fuse and an isolating switch with double pole disconnection.

(7) It is essential that the motorised valve supplied with the system is installed and is not substituted by any other motorised valve which may exist and be in service at the site of installation, eg a motorised valve installed in a central heating circuit.

17 Procedure

Summary of installation procedure

17.1 The storage cylinder is located in position (see the

Kwikot Technical Information and Installers

Instructions

) and the plumbing connections made to the inlet and outlet pipes in the same manner as for a conventional storage cylinder, except that the water supply pipe is taken directly from the mains or other suitable potable supply, via the line strainer and cold water control valves (ensuring the arrow markings on the components are pointing downstream) to the cold water inlet of the storage cylinder (see Figure 2). Where balanced pressures are required, the cold water draw-off is connected as shown in Figure 2, using components supplied by the Certificate holder.

17.2 The discharge pipe is connected to and from the tundish to a safe and visible termination point [see sections 16(3) and (4) of this Detail sheet]. The air gap at the tundish must remain clear.

18 Commissioning

18.2 On completion of the commissioning process the

competent person

completes the label attached to the system, stating that the installation complies with the Certificate (see section 3).

Technical Investigations

The following is a summary of the technical investigations carried out on the Kwikot Indirect Unvented Hot Water Storage System.

19 Tests and investigations

19.1 Tests were carried out in accordance with MOAT No 38 : 1986 to determine:

• capacity of storage cylinder

• dimensional accuracy

• mean supply temperature

• outlet flow rate at various supply flow rates

and pressures

• time taken to heat to 60°C

• re-heat time to 60°C

• standing energy loss (adequacy of insulation)

• watertightness

• resistance of the storage cylinder and expansion

vessel to an internal hydrostatic pressure of 1.5 times the design pressure = 7.5 bar

• resistance to partial vacuum of 0.1 bar absolute

•

flow capacity of the tundish and discharge pipework.

19.2 Tests were carried out to confirm satisfactory operation of the following components when fitted in a system:

• cold water control valves, to include:

– pressure control valve – expansion valve – check valve

• combined temperature and pressure relief valve

•

immersion heater thermostat and non-self-resetting thermal

cut-out

• line strainer

• motorised valve.

19.3 An examination was made of existing data in relation to the performance requirements of the relevant British Standards, to determine the suitability and performance of:

• cold water control valves, to include:

– pressure control valve to BS 6283-4 : 1991 – check valve to BS 6282-1 : 1982 – expansion valve to BS 6283-1 : 1991

• combined temperature and pressure relief valve

to BS 6283-3 : 1991

• line strainer

• immersion heater to BS EN 60335-2.73 : 2003

Electronic Copy

• direct immersion heater thermostat/non-selfresetting thermal cut-out to BS 3955 : 1986

• motorised valve to BS 3955 : 1986

• expansion vessel to BS 6144 : 1990.

19.4 An examination was made of existing data

relating to:

• adequacy of installation instructions

•

practicability of installation by the

competent person

• electrical safety

• effect on water quality and prevention of waste

of water

• properties in relation to fire

• practicability and adequacy of maintenance

requirements

• durability of materials used.

20 Investigations

The manufacturing and assembly process was examined, including the methods adopted for quality control, and details were obtained of the quality and composition of materials used.

Bibliography

BS 864-2 : 1983

Capillary and compression tube fittings of copper and copper alloy — Specification for capillary and compression fittings for copper tubes

BS 2879 : 1980

Specification for draining taps

(screw-down pattern)

BS 3955 : 1986

Specification for electrical

controls for household and similar general purposes

BS 5449 : 1977

Code of practice for central heating for domestic premises — Forced circulation hot water systems

BS 6144 : 1990

Specification for expansion vessels using an internal diaphragm, for unvented hot water supply systems

BS 6282-1 : 1982

Devices with moving parts for the prevention of contamination of water by backflow — Specification for check valves of nominal size up to and including DN 54

BS 6283-1 : 1991

Safety and control devices for use in hot water systems — Specification for expansion valves for pressures up to and including 10 bar

BS 6283-3 : 1991

Safety and control devices for use in hot water systems — Specification for combined temperature and pressure relief valves for pressures from 1 bar to 10 bar

BS 6283-4 : 1982

BS 6700 : 1997

Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages

BS 7206 : 1990

Specification for unvented hot water storage units and packages

BS EN 1057 : 1996

Copper and copper alloys. Seamless, round copper tubes for water and gas in sanitary and heating applications

BS EN 60335-2.73 : 2003

Household and similar electrical appliances — Safety — Particular requirements for fixed immersion heaters

MOAT No 38 : 1986

The assessment of unvented hot water storage systems and the approval and surveillance of installers

On behalf of the British Board of Agrément

Date of Second issue: 10th September 2004 Chief Executive

*Original Detail Sheet issued 23rd September 1996. This amended version includes change of product name and reference to revised Regulations and Standards.

British Board of Agrément

P O Box No 195, Bucknalls Lane Garston, Watford, Herts WD25 9BA

Fax: 01923 665301

For technical or additional information, contact the Certificate holder (see front page). For information about the Agrément Certificate, including validity and scope, tel: Hotline

01923 665400

or check the BBA website.

e-mail: mail@bba.star.co.uk website: www.bbacerts.co.uk

Electronic Copy

Kwikot D 150, D 210 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual