BS EN 14336

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Heating systems in

buildings —

Installation and

commissioning of

water based heating

systems

The European Standard EN 14336:2004 has the status of a British Standard

ICS 91.140.10

12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$: Copyright British Standards Institution

Provided by IHS under license with BSI - Uncontrolled Copy Licensee=AECOM EW & Canada/5906698006, User=Zaraket, Ahmad

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---This British Standard was published under the authority of the Standards Policy and Strategy Committee on 3 August 2005

National foreword

This British Standard is the official English language version of EN 14336:2004. This partially supersedes BS 5449:1990.

Note A National annex to BS EN 14336 will be issued by way of an amendment, incorporating informative guidance on installation and commissioning currently specified in the National annex to BS EN 12828.

The UK participation in its preparation was entrusted to Technical Committee RHE/24, Central heating installations, which has the responsibility to:

A list of organizations represented on this committee can be obtained on request to its secretary.

Cross-references

The British Standards which implement international or European

publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

— aid enquirers to understand the text;

— present to the responsible international/European committee any

enquiries on the interpretation, or proposals for change, and keep the UK interests informed;

— monitor related international and European developments and

promulgate them in the UK.

Summary of pages

This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 40, an inside back cover and a back cover.

The BSI copyright notice displayed in this document indicates when the document was last issued.

Amendments issued since publication

Amd. No. Date Comments

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---EUROPÄISCHE NORM

_{October 2004}

ICS 91.140.10

English version

Heating systems in buildings - Installation and commissioning of

water based heating systems

Systèmes de chauffage dans les bâtiments - Installation et mise en systèmes de chauffage à eau

Heizungsanlagen in Gebäuden - Installation und Abnahme der Warmwasser-Heizungsanlagen

This European Standard was approved by CEN on 29 July 2004.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A L I S A T I O N E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G

Management Centre: rue de Stassart, 36 B-1050 Brussels

Ref. No. EN 14336:2004: E

Copyright British Standards Institution

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---Contents

Page

Foreword...3

1 Scope ...4

2 Normative references ...4

3 Terms and definitions...4

4 Installation ...6

4.1 Coordination of the work ...6

4.2 Inventory and inspection ...6

4.3 Handling ...6 4.4 Storage...6 4.5 Installation of components ...6 4.5.1 General ...6 4.5.2 Heat supply ...7 4.5.3 Heat distribution ...7 4.5.4 Heat emission ...7

4.5.5 Control and monitoring...7

4.5.6 Thermal insulation...8

5 Precommissioning checks...8

5.1 Objective ...8

5.2 State of the system ...8

5.3 Water tightness test ...8

5.4 Pressure test...8

5.5 System flushing and cleaning ...8

5.6 System filling and venting ...9

5.7 Frost precautions ...9

5.8 Operational checks ...9

5.9 Static completion records...9

6 Setting to work ...9

7 Balancing water flow rates ...9

8 Adjusting of controls...10

9 Handover ...10

9.1 Objective ...10

9.2 Documents for operation, maintenance and use ...10

9.3 Instructions on operation and use...10

9.4 Hand over documentation...10

Annex A (informative) Guide to good practice for water tightness test...11

Annex B (informative) Guide to good practice for pressure testing ...13

Annex C (informative) Guide to good practice for system flushing and cleaning ...18

Annex D (informative) Guide to good practice for operational tests...22

Annex E (informative) Guide to good practice for static completion ...27

Annex F (informative) Guide to good practice for setting to work ...28

Annex G (informative) Guide to good practice for balancing water flow rates ...31

Annex H (informative) Guide to good practice for setting of control systems...37

Bibliography ...40

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Foreword

This document (EN 14336:2004) has been prepared by Technical Committee CEN/TC 228 "Heating systems in buildings", the secretariat of which is held by DS.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2005, and conflicting national standards shall be withdrawn at the latest by April 2005.

The subjects covered by CEN/TC 228 are the following:

- Design of heating systems (water based, electrical etc.);

- Installation of heating systems;

- Commissioning of heating systems;

- Instructions for operation, maintenance and use of heating systems;

- Methods for calculation of the design heat loss and heat loads;

- Methods for calculation of the energy performance of heating systems.

Heating systems also include the effect of attached systems such as hot water production systems.

All these standards are systems standards, i.e. they are based on requirements addressed to the system as a whole and not dealing with requirements to the products within the system.

Where possible, reference is made to other European or International Standards, a.o. product standards. However, use of products complying with relevant product standards is no guarantee of compliance with the system

requirements.

The requirements are mainly expressed as functional requirements, i.e. requirements dealing with the function of the system and not specifying shape, material, dimensions or the like.

The guidelines describe ways to meet the requirements, but other ways to fulfil the functional requirements might be used if fulfilment can be proved.

Heating systems differ among the member countries due to climate, traditions and national regulations. In some cases requirements are given as classes so national or individual needs may be accommodated.

In cases where the standards contradict with national regulations, the latter should be followed.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---1 Scope

This document specifies the requirements for the installation and commissioning of water-based heating systems in

buildings with a maximum operating temperature of 110 oC and a maximum operating pressure of 6 bar.

This document covers the system's requirements for the installation and commissioning of individual components of the system (e.g. heat generators, pumps, controls). It does not cover the specific commissioning requirements for these components.

This document does not cover the installation or commissioning of attached systems (e.g. air conditioning, domestic hot water or ventilation systems).

This document covers only the technical requirements, and does not cover any commercial or contractual arrangements between parties.

2 Normative

references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1717, Protection against pollution of potable water in water installations and general requirements of devices to

prevent pollution by backflow.

EN 12170, Heating systems in buildings – Procedure for the preparation of documents for operation, maintenance

and use – Heating systems requiring a trained operator.

EN 12171, Heating systems in buildings – Procedure for the preparation of documents for operation, maintenance

and use – Heating systems not requiring a trained operator.

EN 12828, Heating systems in buildings – Design for water-based heating systems.

EN 1, Preparation of documents used in electrotechnology – Part 1: General requirements (IEC

61082-1:1991).

EN 61082-3, Preparation of documents used in electrotechnology – Part 3: Connection diagrams, tables and lists

(IEC 61082-3:1993).

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1

balancing

process of adjusting flow rates in a system

3.2

commissioning

advancement of an installation from the stage of static completion to working according to specified requirements

3.3

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3.4

heat distribution system

configuration of interconnected components for the dispersal of heat between the heat supply system and the heat emission system or any attached system

3.5

heat emission system

configuration of interconnected components for the dispersal of heat to a heated space

3.6

heat supply system

configuration of interconnected components/appliances for the supply of heat to the heat distribution system

3.7

maintenance

combination of all technical, administrative and managing actions necessary to retain an item in, or restore it to, a state in which it can perform an intended function

3.8

maximum operating pressure

maximum pressure at which the system, or parts of the system, is designed to operate

3.9

maximum operating temperature

maximum temperature at which the system, or parts of the system, is designed to operate

3.10 OM&U

operation, maintenance and use

3.11 operation

actions necessary to make available the services, which the system has been designed to provide

3.12

setting to work

process of setting a static system into operation

3.13 use

action of receiving the services, which the system has been designed to provide

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---4 Installation

4.1 Coordination of the work

Specifications, including drawings and schedules, where appropriate, shall be available. A co-ordinated time schedule of the work shall be available.

It shall be ensured that:

— the site is available and accessible for installation; — handling facilities are provided;

— storage facilities are provided;

— services (e.g. water, electricity, gas) are available; — contractual obligations about site organisation are met.

4.2 Inventory and inspection

Delivered material shall be checked to ensure, that:

— quantities and descriptions correspond to the consignment; — components are undamaged.

4.3 Handling

Any manufacturer’s instructions on how to handle material shall be followed. Suitable handling equipment shall be used where necessary.

Attention shall be given to safety requirements.

4.4 Storage

Storage of components shall be carried out according to the manufacturers’ specifications with particular attention to safety requirements and climatic conditions (e.g. temperature, humidity).

4.5 Installation of components

4.5.1 General

Manufacturers’ instructions for installation shall be available and followed. The components shall be installed in accordance with the design specifications. Proper accessories and tools for assembling and installation shall be available. Before installation every component shall be internally clean and suitable for use.

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7

Components shall be placed, fixed and supported in such a way that no harmful deformations occur and so that thermal expansion is possible.

Electrical components shall be installed in accordance with CENELEC requirements.

4.5.2 Heat supply

The structure upon which the heat supply (generator) is supported and its immediate surroundings shall be in accordance with the design specifications.

Clearances between the heat generator and adjacent materials, e.g. for cleaning and maintenance, shall at least be in accordance with the heat supply manufacturer’s instructions.

Note:

a) special considerations may apply in the case of installations in timber framed buildings with protection of combustible material and fire protection;

b) the plant room shall be built and equipped according to appropriate legal and safety regulations; c) any flue gas system arrangements shall be appropriate for the heat generator;

d) attention shall be paid to heat supply mounting, positioning and connection, in order to limit noise transmission from the appliance;

e) vibration and sound transmission into the building can be minimised by the following measures: 1. vibration insulation between heat supply and support;

2. insulation of the flue gas pipe on its way to the chimney (possibly by the installation of a compensator); 3. insulation of all pipings rigidly connected with the boiler, which lead through walls, ceilings/floors or

concrete.

4.5.3 Heat distribution

Measures shall be taken to prevent moisture, fire smoke, noise and infestants where pipes pass through a structure.

The components shall be installed in a way that allows insulation according to the design.

In cases where joints and components are inaccessible, they shall be permanent. Permanent joints and

components shall be maintenance free and have a durability that corresponds to the lifetime of the components in which they are installed.

Prior to the covering of permanent joints and components, the tightness test shall be carried out.

4.5.4 Heat emission

Heat emitters shall be installed so as to allow venting.

4.5.5 Control and monitoring

Controls shall be accessible for setting and servicing.

Thermometers, manometers, flow meters and energy meters shall be accessible for reading and servicing.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---The following factors shall be considered when installing water temperature sensors, which may be either of type surface sensor or of type insertion sensor:

— stratification effects when mixing hot and cold water; — time lag problems with automatic control;

— location on the upper side of pipes and surface contact of the surface sensor;

— location in elbows or on the upper side of pipes and positioning in the waterstream of the sensitive part of the insertion sensor;

— insulation from the environment.

4.5.6 Thermal insulation

Supports, suspensions, girders and fixpoints passing through the thermal insulation shall be installed so as to limit heat losses.

5 Precommissioning

checks

5.1 Objective

The purpose of the procedure given in this clause is to check that the system is in a satisfactory and safe condition and to achieve static completion before setting to work.

5.2 State of the system

It shall be verified that the installation has been installed in accordance with EN 12828 and 4.5. Inspections shall be carried out in the course of installation and at completion in order to ensure:

— that all plant items are in accordance with the design, drawings, specifications and, where applicable, the manufacturers' instructions;

— that correct installation procedures are being followed; — that the standards of installation are being met;

— availability of a fuel supply and the correct installation of the flue gas removal system.

5.3 Water tightness test

The heating system shall be water tight and tested for leakage. A suggested method is given in Annex A. This test may be an independent test or a combined test for water tightness and pressure verification.

5.4 Pressure

test

The heating system shall be pressure tested to a pressure at least 30 % greater than the working pressure for an adequate period, as a minimum of 2 hours duration. A suggested method is given in Annex B.

5.5 System flushing and cleaning

Systems shall, if necessary, be cleaned and/or flushed. A suggested method is given in Annex C.

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If the system is not to be used immediately, consideration shall be given to whether the system is to be left full or empty.

5.6 System filling and venting

The system shall be filled with suitable water and vented. Water treatment apparatus, where specified by the designer, shall be filled and set in operation in accordance with specialist instructions.

When the whole system is filled, disconnection of the filling source connections to the water supply shall be according to EN 1717.

The working pressure of the system shall not be exceeded when filling from a high-pressure source.

NOTE To ensure effective venting, the system shall be filled slowly from the bottom upwards, thus forcing the air to high points for venting to atmosphere. Careful consideration shall be given to the setting of valves and air vents before and during filling to avoid airlocks and excessive spillage, particularly where the fill is treated.

5.7 Frost

precautions

Where the work is being carried out in cold weather, it is essential that any equipment susceptible to frost damage be protected.

NOTE If the system is not to be used for a prolonged period, consideration shall be given to whether the system is to be drained.

5.8 Operational

checks

All components of the system shall be checked for correct operation. Suggested methods are given in Annex D.

5.9 Static completion records

Static completion records shall be completed. Sample record sheets are given in Annex E.

6 Setting to work

It shall be confirmed that:

— the heating appliance can provide heat; — the pump(s) is(are) operational;

— all parts of the system are able to receive heat.

NOTE The latter bullet may involve some adjustment of valves.

Suggested methods on setting to work are given in Annex F.

7 Balancing water flow rates

The water flow rates shall be balanced to meet the requirements of the design. Guidelines on a number of balancing methods and tolerances are given in Annex G.

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Adjusting of controls

All controls shall be adjusted in accordance with the manufacturers’ instructions and the design specification. A typical checklist for setting and adjusting of controls is given in Annex H.

9 Handover

9.1 Objective

The objective is to hand over written instructions about the operation, maintenance and use of the heating system and any attached systems, to give instructions to the user and to confirm that the commissioning requirements of the specification have been met.

9.2 Documents for operation, maintenance and use

Instructions for operation, maintenance and use (OM&U instructions) shall be prepared in accordance with the specific requirements of the heating system. These instructions shall comply with the requirements of EN 12170 or EN 12171, as applicable.

9.3 Instructions on operation and use

The operator/user shall be instructed on the operation/use of the heating system.

9.4 Hand over documentation

Hand over documentation shall contain all information necessary to enable the installation and equipment to be operated and maintained. Hand over documentation shall include the following as required by the contract: — OM&U instructions;

— controls and electrical schematics and wiring diagrams. These documents shall comply with EN 61082-1 and EN 61082-3;

— records about pressure and functional testing;

— records about environmental testing, e.g. flue gas testing; — balancing report.

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Annex A

(informative)

Guide to good practice

for

water tightness test

A.1 General

The Contractor shall test the heating system for water tightness after installation but before insulating pipework, covering of shafts or openings in the walls and ceilings as well as before covering a floor heating system with screed or other coverings.

A.2 Procedure

For doing the water tightness test, the system shall be filled with filtered water starting from the lowest point (filling valve) up to the highest point and shall be vented. Having filled the system, the vents shall be shut and the system shall be checked for water tightness.

In case of doing the water tightness test with inert gas, the safety requirements for each test shall be met and all connections to appliances and joints shall be checked for water tightness with soap water.

The heating system is tight if no water is escaping or, in case of testing by inert gas, no bubbles can be seen or heard.

A.3 Documentation

After the water tightness test, a record shall be prepared containing the following information: — date of test;

— data on the heating system, including position in the building and maximum operational pressure; — test pressure;

— time period of water tightness test;

— confirmation that the system is watertight and that no permanent deformation was found. See Typical Water Tightness Test Report, Form A1.

These reports should be passed to the technical author of the OM&U instructions in accordance with the system designer's requirements.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---TYPICAL WATER TIGHTNESS TEST REPORT FORM A1 PROJECT: ... REF: ... ADDRESS: ... ... CLIENT NAME: ... ADDRESS: ... ... SYSTEM TESTED: ...

SECTION OF SYSTEM TESTED: ...

PLANT TESTED: ...

TYPE OF TEST (HYDRAULIC OR

PNEUMATIC): ... TEST PRESSURE (BAR): ...

TIME PERIOD (HOURS): ...

WORKING PRESSURE (BAR): ... TEMPERATURE (°°°°C): ...

RESULTS: ... ... ...

CONFIRM SYSTEM/PLANT IS TIGHT AND WITHOUT

DEFORMATION: ... REMARKS: ... ... ... QUALITY STANDARD: ... ... SIGNED: ...

REPORT CARRIED OUT BY: ...

POSITION: ...

WITNESSED BY: ...

FOR: ...

DATE: ...

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Annex B

(informative)

Guide to good practice

for

pressure testing

B.1 General

Pressure testing should be carried out normally by hydraulic testing using water, exceptionally by pneumatic testing using inert gas or air, and only under the carefully controlled conditions.

The dangers of testing with compressible gases, such as nitrogen or air, are not always realised. At the pressure ranges normally encountered, the amount of energy stored in compressed air or gas is 200 times more than that contained in water at the same pressure and volume. This energy can be released with explosive force if a joint, pipe section, or other component fails under test pressure.

For this reason, hydraulic pressure testing is by far the safer method and shall be used wherever practicable. In circumstances where pneumatic testing is unavoidable, e.g. where contamination of the interior of the vessel by water is not acceptable, stringent safety precautions shall be followed.

The following procedures and safety precautions shall be observed when either pneumatic or hydraulic testing is being carried out.

The testing procedures available can be summarised as follows:

— hydraulic pressure test - this is the preferred method because it is the safest and should be used wherever practicable;

— pneumatic leak test followed by hydraulic pressure test - this is used only where water leakage would cause unacceptable damage.

Where pneumatic leak testing with air or nitrogen or by means of tracer gas is used, this testing should always be carried out before hydraulic pressure testing.

B.2 Procedures

B.2.1 Pre-test

considerations

Before beginning a particular test, the following questions shall be considered: a) Has the system been flushed?

b) Is the specified test appropriate to the service and the building environment?

c) Would it be advisable to test with compressed air at limited pressure before filling with water, in order to locate major faults?

d) Will a water test leave undrained pockets subject to frost damage?

e) Is the specified test pressure correct, e.g. in high buildings? The vertical pipework may have to be divided in order to limit pressures, but at all points a test pressure equal to 1,3 times the working pressure shall be applied.

f) Have vulnerable items been blanked-off?

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---g) Has the test source, e.g. mains, water pump, compressor cut-out, higher pressure capabilities than the pipework under test?

h) What damage may be caused in the event of a leak?

i) Is an adequate labour force available to keep a progressive check while filling? j) Are all parts under test freely observable?

k) Can the system be safely left partly filled? If not, the extent of the test shall be limited by the time available to fill, test and drain.

l) Would it save time and be advisable temporarily to interconnect parts of different systems for simultaneous testing?

m) How quickly can the system be filled from the normal water supply, taking into account the building height? If the discharge rate from the normal water supply - allowing for users - is inadequate, hand or mechanical pumping should be considered.

B.2.2 Hydraulic pressure testing

B.2.2.1 Preparations

When preparing a hydraulic pressure testing, the following procedure should be applied: a) blank, plug or seal off all open ends;

b) remove and/or blank off vulnerable items, fittings and plant pressure switches and expansion bellows;

c) close all valves at the limits of the test section of the pipework. Plug the valves if they are not tight, or could be subjected to vibration or tampering;

d) open all valves in the enclosed test section;

e) check that all high points have vents, and that these vents are closed;

f) check that the testing pressure gauge or manometer is functioning, has the correct range and has been recently calibrated;

g) check that there are adequate drain cocks, a hose is available and that it will reach from the cocks to the drain; h) assess the best time to start the test in view of the duration required after completion of all the preliminaries.

B.2.2.2 During tests

For a hydraulic pressure testing, the following procedure should be applied:

a) when filling the system with water or other liquid, 'walk' the system continuously checking for leaks by the noise of escaping air or signs of liquid leakage;

b) release air from high points systematically up through the system;

c) when the system is full of water, raise the pressure to test pressure and seal;

d) should the pressure fall, check that stop valves are not letting and then 'walk' the system again checking for leaks;

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e) when satisfied that the system is sound, have the test witnessed by e.g. the clerk of works, the client's representative, and obtain relevant signatures.

B.2.2.3 After tests

After a hydraulic pressure testing, the following procedure should be applied:

a) release pressure;

b) if any of the following work is necessary then the system shall be drained down: — vulnerable items have to be refitted;

— the system has to be extended from temporarily plugged ends; — the system has to carry fluids other than water, e.g. air, steam.

c) ensure that the vents on e.g. cylinders, tanks, vessels, are opened to the atmosphere before draining down, otherwise collapse under vacuum may occur;

d) in some cases, the pipework shall be dried out by passing warm air through it for some hours.

B.2.3 Pneumatic pressure testing followed by hydraulic pressure testing

B.2.3.1 Preparation

When preparing a pneumatic pressure testing, the following procedure should be applied:

a) a responsible person shall be designated who will, at all times during the test procedure, be in charge of the operation. He will direct the preparation of the installation for testing, supervise the application of pressure and, at the conclusion of the test, check that the installation has been lowered to atmospheric pressure. A written record of the test in the form of a test report stating the design working pressure, the test pressure and the duration of application shall be prepared;

b) at the conclusion of the test, the installation shall be left in a condition suitable for safe operation at the designed working pressure;

c) blank, seal or plug off all open ends;

d) remove and/or blank off vulnerable items, fittings and plant meters, pressure switches and expansion bellows; e) blank, seal or plug off all valves at the limits of the test section;

f) open all valves in the test section;

g) check that all high points are vented, but that vents are closed;

h) check that the pipework is fitted with a testing pressure gauge or manometer of the correct range and that it has recently been calibrated;

i) if possible, the compressed air supply should be controlled outside the test area;

j) if the air for test purposes is to be taken from a source at a higher pressure than is required for the test, a reducing valve, pressure gauge, and safety valve set to lift at the test pressure shall be fitted to the connecting pipework;

k) any flexible connections in the air supply shall be securely fastened;

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---l) before the air leak test pressure is applied, ensure that all personnel are withdrawn from the vicinity of the pipework;

m) air shall be admitted slowly, controlled by a suitable reducing valve set at the test pressure;

n) if the air for testing is taken from an high pressure source, it will fall in temperature as it enters the system. On subsequently rising to ambient temperature, the air pressure in the pipework will tend to rise. Steps shall be taken to ensure that the air pressure does not exceed the designated leak test pressure, In all cases, a safety valve set for the test pressure should be connected to the pipework;

o) at no time while the pipework is undergoing air pressure testing may any hammer testing of welds be carried out.

B.2.3.2 During tests

For a pneumatic pressure testing, the following procedure should be applied: a) apply air overpressure up to the maximum of 0,5 bar;

b) after an interval of about ten minutes, 'walk' the system and test for leaks by noise of escaping air or by using soapy water;

c) release air pressure and carry out the normal hydraulic pressure testing procedure as described in B.2.2.

B.3 Documentation

After the pressure test, a record shall be prepared containing the following information: — date of test;

— data on the heating system, including position in the building and maximum operational pressure; — test pressure;

— time period of pressure test; — name of operative.

See Typical Pressure Test Report, Form B1.

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TYPICAL PRESSURE TEST REPORT FORM B1

PROJECT: ... REF: ... ADDRESS: ... ... CLIENT NAME: ... ADDRESS: ... ... SYSTEM TESTED: ...

SECTION OF SYSTEM TESTED: ...

PLANT TESTED: ...

TYPE OF TEST (HYDRAULIC OR

PNEUMATIC): ... USED EQUIPMENT:

TEST PRESSURE (BAR): ...

TIME PERIOD (HOURS): ... WORKING PRESSURE (BAR): ... TEMPERATURE (_°°°°C): ... RESULTS: ... ... ... REMARKS: ... ... ... QUALITY STANDARD: ... ... ... SIGNED: ...

POSITION: ...

FOR: ...

DATE: ...

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---Annex C

(informative)

Guide to good practice

for

system flushing and cleaning

C.1 General

Care shall be taken during construction to keep the internal surfaces of pipework systems clean. Serious blockages in equipment will prove damaging and expensive to rectify. It is, therefore, most important that the system is

thoroughly cleaned of all detritus.

On no account should any part of the system be drained and left empty for longer than 24 hours after cleaning, as this will promote rapid corrosion and possibly necessitate a re-clean.

Frost protection systems shall be active after flushing or chemical cleaning in order to avoid damage and the loss of chemicals during cold periods.

Water introduced into a building water system for commissioning purposes should be completely drained away unless the system is to be put into service immediately. It should be noted that for closed water systems, at low risk of disseminating Legionnaires' disease, this practice would be both costly and unnecessary.

Chemicals for cleaning should not damage internal parts of the installation (e.g. elastomer parts) and /or trigger corrosion.

C.2 Procedures

C.2.1 Flushing

Systems shall be cleaned and flushed in accordance with an agreed and approved method plan. Throughout the cleaning and flushing process, the carrying out of procedures in accordance with the method plan should be verified.

Satisfactory compliance may be ensured by certification. Additionally, the commissioning specialist should be satisfied that the system has been adequately cleaned, by reference to the certification.

The following procedure is recommended:

a) flushing should be supervised only by qualified staff;

b) a flushing schedule should be provided by the installation contractor and approved in accordance with the specifications, before the physical process commences;

c) the schedule should be based on schematic drawings with all sub-circuits, branches, and terminals uniquely identified. All valves, coils, tubes, and other equipment liable to choking should be clearly identified;

d) flushing should be carried out methodically from the top to the bottom of the system;

e) equipment liable to choking should be by-passed, isolated, or completely removed and replaced by a spool piece to ensure system flow continuity;

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19

g) the pipework of the heat distribution system should be separated into isolated sections of high to low points; h) each section should incorporate a drain valve at its lowest point. The full bore valve should be of line size and at

least 50 mm on larger diameters all having access to drainage; i) each section should incorporate a suitable quick fill point;

j) each section should be flushed in turn, starting with the highest point. The section valves should be open, including by-pass and drain valves. Commence flushing downwards;

k) each section should be isolated in turn until test samples do not contain significant signs of detritus. Strainers should be inspected at regular intervals during this process;

l) after the final high velocity flush, the system should be filled with clean water together with suitable cleaning additives. Circulation through the system to be cleaned should be in accordance with the recommendations made by the specialist supplier and the cleaning and flushing method plan. This procedure should assist in removing the sludge, which adheres to the pipe wall, and keep it in suspension for draining;

m) once the system is clean, it should be drained and filled immediately from the bottom up. Filling should be slow, taking care to remove air from extremities and high points. The system should then be dosed to prevent further corrosion and left circulating. Dosing and venting should be monitored frequently in the early stages of system; n) where chemical cleaning is not specified, the drain valves and the water inlet should be closed. All items which

have been removed or isolated should be replaced or reinstated;

o) this work should be carried out before the system is balanced. Evidence should be produced to show that flushing and cleaning have been done effectively, since system cleanliness has a marked bearing on balancing and system performance.

C.2.2 Chemical

cleaning

For chemical cleaning, the following procedure should be applied:

a) chemical cleaning should be preceded by flushing with frequent sample testing as necessary;

b) the system shall be completely flushed and water filled with or without inhibitor, in accordance with the specification;

c) where the whole system is not being chemically cleaned at the same time, it is recommended that the isolating valves be locked in order to avoid pollution from untreated sections.

C.3 Documentation

After system flushing and cleaning is complete, a record shall be prepared containing the following information: — date of flushing and chemical cleaning;

— reference number of method plan; — details of chemicals used in cleaning; — details of dosing chemical required; — name of operative.

See Typical System Flushing Report, Form C1.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---These reports should be passed to the technical author of the OM&U instructions in accordance with the system designer's requirements.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---21

TYPICAL SYSTEM FLUSHING REPORT FORM C1

PROJECT: ... REF: ... ADDRESS: ... ... CLIENT NAME: ... ADDRESS: ... ... SYSTEM FLUSHED: ... SECTION NO: ... PLANT FLUSHED: ... PLANT NO: ...

METHOD PLAN REFERENCE: ...

DETAILS OF CHEMICAL CLEANING APPLIED: ... DETAILS OF DOSING ... INTRODUCED: ... COMMENTS: ... ... ... SIGNED: ...

POSITION: ...

FOR: ...

DATE: ...

(24)

--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---Annex D

(informative)

Guide to good practice

for

operational tests

D.1 General system check

Tests and examinations of all component parts and sections of the system other than auxiliary systems should be carried out. This will verify that the system may be put into use and commissioned.

Check every moving piece of equipment visually for freedom of movement and that electrical circuitry is correct. The following are only prime examples.

D.2 Mechanical

checks

D.2.1 Pumps

The following checks should be made in respect to relevant pump types with the system full of water to make sure that:

a) external parts of the pump are clean; b) mounting direction of the pump is correct;

c) all components, bolts, fixings, and fittings are secure and that no distortion has taken place on the base in tightening;

d) the impeller is free to rotate;

e) the anti-vibration mountings have correct deflection; f) the pipework imposes no strain at the pump connections; g) the bearings are clean;

h) pressure test points have been fitted at both the suction and discharge points of the pump to facilitate head tests to confirm inferred pump performance.

and further for belt driven pumps the following should be checked:

i) the level and plumb of pump and motor shaft and slide rails are correct. Direct driven pumps require particular attention in this respect, with reference to the manufacturer's recommendations;

j) the correct drive has been fitted;

k) pulleys and couplings are secure and their alignment is correct; l) belts are tensioned;

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23

n) the coolant is available at the bearing or seal;

o) drive guards have been securely fitted with proper access for tachometer readings and belt changes.

D.2.2 Automatic control valves

For automatic control valves, the following checks should be made to ensure: a) that the valve ports are correctly oriented with respect to water flow; b) that the valve spindles are free to move;

c) the rigidity of the mountings;

d) the valve stroke, mechanical couplings and linkages for correct geometry; e) freedom from excessive movement in the linkage;

f) the tightness of locking devices;

g) the actuators have been fitted according to manufacturers' recommendations with access to electrical connections.

D.3 Electrical

checks

D.3.1 Checks with all electrical supplies isolated

With all electrical supplies isolated, the following checks should be made to ensure that: a) appliance and control circuits are locally isolated;

b) there are no unprotected live components within the panels; c) panels and switch gear are clean;

d) appliances and surrounding areas are clean and dry; e) there is no mechanical damage to switch gear; f) all connections on bus bars and wiring are tight;

g) all power and control wiring has been completed in detail in accordance with the circuit diagram; h) all fuse ratings are correct;

i) starter overloads are set to the motor full load current (FLC).

D.3.2 Checks with electrical supply available

With electrical supply available, the following checks should be made to ensure:

a) that correct provision has been made for local isolation of the plant for both electrical and mechanical safety; b) that the correct voltage is available to the entire plant (e.g. single- or three-phase);

c) positive operation of all contactors, relays and interlocks. The control circuit should be actuated and the starter operation observed, adjusting the timers where necessary.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---D.4 Documentation

Great importance is attached to the provision of operational test records to ensure that all defects have been rectified before setting to work and balancing. It is recommended that the results of all checks and any required remedial works be documented fully.

After the operational tests are complete, a record shall be prepared containing the following information: — date of test;

— list of tests carried out; — name of operative.

See Typical Operational Test Report for pumps, Form D1. Other operational tests should be reported in a similar manner.

(27)

--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---25

TYPICAL OPERATIONAL TEST REPORT FORM D1

PROJECT: ... REF: ... ADDRESS: ... ... CLIENT NAME: ... ADDRESS: ... ... SYSTEM OR PLANT

PUMPS OK/X COMMENTS/FOLLOW-UP REF'S

CHECK THAT:-

A. EXTERNAL PARTS OF THE PUMP ARE CLEAN: ...

B. MOUNTING DIRECTION OF THE PUMP IS CORRECT: ... C. ALL COMPONENTS, BOLTS, FIXINGS, & FITTINGS ARE

SECURE & THAT NO DISTORTION HAS TAKEN PLACE ON

THE BASE IN TIGHTENING: ...

D. THE IMPELLER IS FREE TO ROTATE: ...

E. THE ANTI-VIBRATION MOUNTINGS HAVE CORRECT

DEFLECTION: ...

F. THE PIPEWORK IMPOSES NO STRAIN AT THE PUMP

CONNECTIONS: ...

G. THE BEARINGS ARE CLEAN: ...

H. PRESSURE TEST POINTS HAVE BEEN FITTED AT BOTH THE SUCTION AND DISCHARGE POINTS OF THE PUMP TO FACILITATE HEAD TESTS TO CONFIRM INFERRED PUMP

PERFORMANCE: ...

BELT-DRIVEN PUMPS OK/X COMMENTS/FOLLOW-UP REF'S

CHECK THAT:-

A. THE LEVEL OF PLUMB OF PUMP, MOTOR SHAFT & SLIDE RAILS ARE CORRECT; DIRECT DRIVEN PUMPS REQUIRE PARTICULAR ATTENTION IN THIS RESPECT, WITH REFERENCE TO THE MANUFACTURER'S

RECOMMENDATIONS: ...

B. THE CORRECT DRIVE HAS BEEN FITTED: ... C. PULLEYS & COUPLINGS ARE SECURE & THEIR ALIGNMENT

IS CORRECT: ...

D. BELTS ARE TENSIONED: ... E. THE LUBRICANT IS OF THE CORRECT GRADE & IS FRESH: ... F. THE COOLANT IS AVAILABLE AT THE BEARING OR SEAL: ...

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---TYPICAL OPERATIONAL TEST REPORT FORM D1

G. THE GLANDS, WHERE FITTED, HAVE BEEN CORRECTLY PACKED & THE GLAND NUTS ARE NOT MORE THAN FINGER TIGHT, PENDING ADJUSTMENT TO CORRECT DRIP

RATE AFTER START-UP: ... H. DRIVE GUARDS HAVE BEEN SECURELY FITTED WITH

PROPER ACCESS FOR TACHOMETER READINGS AND BELT

CHANGES: ...

SIGNED: ...

POSITION: ...

FOR: ...

DATE: ...

(29)

--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---27

Annex E

(informative)

Guide to good practice

for

static completion

Static completion should be confirmed before setting to work. All report forms completed in accordance with Annexes A –to D should be listed as shown in the Typical Static Completion Report, Form E1.

TYPICAL STATIC COMPLETION REPORT FORM E1

PROJECT: ... REF: ... ADDRESS: ... ... CLIENT NAME: ... ADDRESS: ... ... TEST REPORTS ... ... CONFIRM COMPLETION OF FORMS A – D

FORM A1

WATER TIGHTNESS TEST FORM B1 PRESSURE TEST FORM C1 SYSTEM FLUSHING FORM D1 OPERATIONAL TEST

(30)

--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---Annex F

(informative)

Guide to good practice

for

setting to work

F.1 General

Guarding arrangements should be provided where necessary.

F.2 Procedures

The following are prime examples.

F.2.1 Checks before pump start

With the system filled, the following checks should be made to ensure that: a) all valves are fully open in their normal operative (open or closed) position;

b) all thermostatically controlled valves are fully open and will not be affected either by ambient air or water temperature;

c) a method of operating automatic control valves is available and that these are motored to normal operating mode;

d) the pump suction and return valves are fully open on the selected pump;

e) the delivery valve is closed on any stand-by pump unless non-return valves are fitted. The suction valve should be left open (it is not good practice to leave any vessel full of water and completely isolated, as a temperature rise could cause an excessive build-up of pressure);

f) the pump casing is vented of air;

g) the selected pump discharge or flow valve is partially closed to limit the initial start current.

F.2.2 Preliminary check of pumps

Where appropriate, the following checks should be made to ensure that: a) the direction and speed of rotation of the motor shaft are correct; b) the motor, pump and drive are free from vibration and undue noise;

c) for star-delta starters, the starter sequence timing has been adjusted as necessary in the light of motor starting current;

d) the motor running current is balanced between phases and does not exceed the motor nameplate stated rating; e) there is no sparking at the commutator or slip rings where fitted;

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---29

g) there is no seepage of lubricant from the housing; h) there is no overheating of the bearings;

i) the water flow to water-cooled bearings is sufficient; j) on multi-speed motors, motor running currents are correct;

k) the ventilation systems of air-cooled motors are operating correctly.

The pump pressure should be compared against the system design circulating pressure using the pump differential pressure gauge. If there is any deviation, the cause should be investigated.

F.3 Documentation

After setting to work, a record shall be prepared containing the following information: — date of test;

— checks carried out; — name of operative.

See Typical Setting to Work Report, Form F1.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---TYPICAL SETTING TO WORK REPORT FORM F1 PROJECT: ... REF: ... ADDRESS: ... ... CLIENT NAME: ... ADDRESS: ... ... SYSTEM OR PLANT

PUMPS OK/X COMMENTS/FOLLOW-UP REF'S

CHECK THAT:-

A. ALL VALVES ARE FULLY OPEN IN THEIR NORMAL

OPERATIVE (OPEN OR CLOSED) POSITION: ... B. ALL THERMOSTATICALLY CONTROLLED VALVES ARE

FULLY OPEN and WILL NOT BE AFFECTED EITHER BY

AMBIENT AIR OR WATER TEMPERATURE: ...

C. A METHOD OF OPERATING AUTOMATIC CONTROL VALVES IS AVAILABLE AND THAT THESE ARE MOTORED TO

NORMAL OPERATING MODE: ... D. THE PUMP SUCTION & RETURN VALVES ARE FULLY OPEN

ON THE SELECTED PUMP: ...

E. THE DELIVERY VALVE IS CLOSED ON ANY STANDBY PUMP UNLESS NON-RETURN VALVES ARE FITTED; THE SUCTION VALVE SHOULD BE LEFT OPEN (IT IS NOT GOOD

PRACTICE TO LEAVE ANY VESSEL FULL OF WATER AND COMPLETELY ISOLATED, AS A TEMPERATURE RISE

COULD CAUSE AN EXCESSIVE BUILD-UP OF PRESSURE): ...

F. THE PUMP CASING IS VENTED OF AIR: ... G. THE SELECTED PUMP DISCHARGE OR FLOW VALVE IS

PARTIALLY CLOSED TO LIMIT THE INITIAL START

CURRENT: ...

SIGNED: ...

POSITION: ...

FOR: ...

DATE: ...

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---31

Annex G

(informative)

Guide to good practice

for

balancing water flow rates

G.1 General

Flow balancing of the water circuits in a heating system is carried out in order to ensure that the system has the capacity to deliver the heat to all the rooms in the building. The flow rate is normally given in the design

specifications.

The required differential pressure and flow in a pumped heating system is normally calculated by the designer. With concern to the complexity, size, design condition and the use of the building, one of the balancing methods

described hereafter should be employed.

G.2 Balancing with flow measurement and manual balancing valves

When adjusting one balancing or radiator valve in the system, this adjustment has an impact also on all other parts in the rest of the system. In order to keep track of these changes different methods are employed.

G.2.1 The iterative method

The principle is to decrease the excess flow in some circuits in order to increase the flow in more remote circuits. The balancing shall be repeated until all balancing and radiator valves have the flows within specified tolerances.

G.2.2 The proportional method

When several terminals are connected to the same circuit, any variation of the differential pressure at the inlet of the circuit modifies the flows in all other circuits in the same proportion. This rule implies that pressure drops in all elements (e.g. pipes, valves, radiators) depend on the flow based on the same relation (pressure drop is

proportional to the flow squared) and that their hydraulic resistance remains unchanged. This fundamental principle is used to balance radiators in a branch and balancing valves between themselves.

The main steps of the work are as follows:

a) identify one branch with a high flow ratio and measure all flows in that branch. (Flow ratio = measured flow/specified flow);

b) all balancing valves in this branch should first be adjusted to the calculated value of the pre-setting; c) identify the branch with the lowest flow ratio - this is the index circuit;

d) now start with the valve showing the highest flow ratio and take that flow down to achieve the same flow ratio as in the index circuit;

e) execute this for the rest of the branches, keeping track of changes in the index circuit; f) the last operation is to adjust the main balancing valve to get the overall flow ratio = 1.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---G.2.3 The compensated method

This method is based upon the proportional method, but it has been further developed in one essential aspect. During the balancing work, the flow ratio is kept equal to one from the start with the most farthest circuit (= reference circuit), then adding the next circuit adjusting it to the flow ratio equal to one as well and successively adjusting the rest of the circuits in the same manner. The assumption is that the index circuit is located farthest away in the branch.

a) divide the system into modules. One module normally consists of one branch with one main valve for that branch;

b) allocate a low readable pressure drop to the index circuit (e.g. 0,03 bar); c) adjust the setting of the valve for correct flow at a pressure drop of 0,03 bar;

d) measure the pressure drop on the index circuit and keep it constant during the balancing of the rest of this branch. To do so, use the balancing valve (partner valve) at the inlet of the branch. Whenever the pressure drop decreases or increases because of adjusting the balancing valves in the circuit, the partner valve is adjusted to maintain the same pressure drop at the index circuit.

e) execute this for all the rest of the branches;

f) last operation is to adjust the partner balancing valves (branches) in the same manner to get the total flow correct.

G.2.4 Computer aided balancing method

A program which contains the valve parameters and the logic of a normal system can solve the problem interactively.

a) divide the system into modules. One module normally contains of one branch with one main valve for that branch;

b) measure the valves in that branch and store the result in the computer;

c) after completion of all valves in the branch, the computer calculates the pre-setting of the valves; d) set the valves according to the result from the computer;

e) verify the result;

f) make a printout as a report.

G.3 Balancing with flow measurement and self acting balancing valves

G.3.1 Differential pressure controller

A differential pressure controller keeps the pressure constant over a group or branch. Balancing of the radiators or terminals after the differential pressure controller should take place. The flow through the branches should be verified for full flow conditions.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---33

G.3.2 Flow limiter

A mechanical flow limiter keeps automatically the flow to the terminals at the specified level, if there is sufficient differential pressure. It is important that the control valve can work properly when it is facing the increased pressure drop caused by the action of the flow limiter. The flow through the branches should be verified for full flow

conditions.

G.4 Regulation by temperature balance

Where either a complete system or part of a system consists of a relatively small number of terminal units, or where the permissible flow deviation exceeds +/- 20 %, it will often not be economic to install flow measuring devices. The temperature balance method should be confined to systems, where the same temperature difference is required through each terminal unit. With this method, system regulation should be carried out with a temperature drop of at least 0,75 times the design temperature drop.

G.4.1 Concept

The system should be balanced by regulating the flow rate of the pump in order to ensure that the design temperature difference across the boiler is achieved.

The available heat flow into the distribution circuits should be shared between the total number of heat emitters.

G.4.2 Method

The main steps of the temperature balance method are as follows: a) remove thermostatic radiator valve heads;

b) the process commences with all valves fully open;

c) establish the necessary primary water temperature drop across the ‘index’ circuit. The other emitters are adjusted progressively back from the ‘index’ circuit to the same temperature drop by adjusting the terminal valves;

d) heat balance and regulation of individual heat emitters on a branch circuit should be finalised before any regulation is carried out upon the circuit they comprise.

There may be a need to subsequently verify the performance of the heat emitters in rooms and zones, to confirm that they provide the specified design temperatures under design conditions. Such adjustments should be made, as a final step in the balancing procedure.

G.5 Flow

accuracy

The quality of the balancing depends on the accuracy of the flow, but there is a great difference in the need of accuracy in various types of heating systems. Systems with little temperature difference or automatic radiator valves do not need high accuracy, whereas systems with high temperature difference need more accurate balancing. It is important to notice that the quality of balancing is not the only issue that has influence on the room temperature. If there are faults in the design, an accurate balancing cannot help, but on the other hand a bad balancing may make it worse.

To keep the design room temperature deviation within 1 °C or 2 °C (the difference between the highest and lowest measured room temperature in the heating system), the flow deviation should not exceed the values given in Table G.1 below. These values are basically determined by three of the design parameters, the design supply

temperature (ts), the design outdoor temperature and the design temperature difference between supply and return

of the heating system (ts-tr).

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---Maximum and minimum flow deviation from the design flow rates through the radiators, corresponding to a design room temperature deviation of 1 °C and 2 °C, are given in Table G.1 for different design temperatures at room temperature 20 °C.

Table G.1 - Maximum and minimum flow deviation from the design flow rates through the radiators for different design temperatures at room temperature 20 °C

Room temperature deviation within 1 °C Room temperature deviation within 2 °C Permissible flow deviation

(%)

Permissible flow deviation (%)

Outdoor design temperature Outdoor design temperature

ts/tr (°C) 0 °C -10 °C -20 °C ts/tr (°C) 0 °C -10 °C -20 °C 90/75 +/-40 +/-30 +/-20 90/75 +/-50 +/-40 +/-30 90/70 +/-25 +/-20 +/-15 90/70 +/-50 +/-40 +/-25 90/60 +/-25 +/-20 +/-15 90/60 +/-40 +/-30 +/-20 80/60 +/-25 +/-20 +/-15 80/60 +/-50 +/-40 +/-20 80/50 +/-15 +/-10 +/-5 80/50 +/-40 +/-30 +/-20 80/40 +/-15 +/-10 +/-5 80/40 +/-30 +/-20 +/-10 75/65 +/-40 +/-30 +/-20 75/65 +/-50 +/-40 +/-30 75/50 +/-25 +/-15 +/-5 75/50 +/-40 +/-30 +/-20 75/45 +/-15 +/-10 +/-5 75/45 +/-30 +/-20 +/-10 75/40 +/-15 +/-10 +/-5 75/40 +/-30 +/-20 +/-10 70/45 +/-15 +/-10 +/-5 70/45 +/-40 +/-30 +/-20 70/40 +/-15 +/-10 +/-5 70/40 +/-30 +/-20 +/-10 60/45 +/-25 +/-15 +/-5 60/45 +/-50 +/-40 +/-25 60/40 +/-25 +/-15 +/-5 60/40 +/-40 +/-30 +/-20 55/45 +/-25 +/-20 +/-15 55/45 +/-50 +/-40 +/-25

NOTE According to EN 442-2:1996, 3.29, the standard thermal output of a radiator is defined for a standard reference air temperature of 20 °C, and inlet water temperature of 75 °C and an outlet water temperature of 65 °C.

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35 G.6 Balancing

Report

Balancing is a very important part of the installation. It is an indication that the design flow requirements have been met, and that the control valves can do their work. The balancing documentation is of great value also for future changes and for analyses of the system.

For all of the balancing methods, a signed balancing report should be filed among the system documentation. See Typical Balancing Report, Form G1.

These documents should be passed to the technical author of the OM&U instructions in accordance with the system designer's requirements.

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---TYPICAL BALANCING REPORT FORM G1 PROJECT: ... REF: ... ADDRESS: ... ... CLIENT NAME: ... ADDRESS: ... ...

CALCULATED VALUES FOR PRE-SETTING OF BALANCING VALVES

MEASURED VALUES

REF. NO.

TYPE SIZE POSITION FLOW FLOW

NO.

FLOW

∆∆∆∆

P POSITION REMARKS

1st 2nd 1st 2nd 1st 2nd 1st 2nd 1st 2nd 1st 2nd SIGNED: _... REPORT CARRIED OUT BY: _... POSITION: _{... ...} WITNESSED BY: _...

FOR: _...

(39)

37 Annex H

(informative)

Guide to good practice

for

setting of control systems

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--``,,```,,,``,```,``,``````,``,-`-`,,`,,`,`,,`---TYPICAL CHECKLIST FOR THE SETTING OF CONTROL SYSTEMS FORM H1 PROJECT: ... REF: ... ADDRESS: ... ... CLIENT NAME: ... ADDRESS: ... ... CONTROLS SPECIFICATION REF: ... CONTROLS TOLERANCE: HUMIDITY ... TEMPERATURE ... PRESSURE ... ARE MANUFACTURER'S COMMISSIONING MANUALS AVAILABLE: ... GENERAL

CHECK THE FOLLOWING:

A. ALL ELECTRICAL SUPPLIES ARE ISOLATED:

B. CONTROL COMPONENTS INSTALLED CORRECTLY:

C. SAFETY DEVICES AND INTERLOCKS ARE OPERATIONAL:

D. ALL SOURCES ARE CORRECTLY LOCATED:

E. THAT MEASURING INSTRUMENTS HAVE CURRENT CALIBRATION CERTIFICATES:

F. ALL PUMP AND FAN FLOW RATES AND PRESSURES ARE WITHIN DESIGN TOLERANCES:

G. WATER AND AIR TEMPERATURES ARE WITHIN DESIGN TOLERANCES:

H. PRESSURE DIFFERENTIAL ACROSS ALL DEVICES IS WITHIN DESIGN TOLERANCES:

ELECTRICAL SUPPLY AND WIRING

PRIOR TO SWITCHING ON ELECTRICAL SUPPLY CHECK:

A. WIRING IS IN ACCORDANCE WITH LOCAL STANDARDS:

B. WIRING IS IN ACCORDANCE WITH CONTROL MANUFACTURERS REQUIREMENTS:

C. CORRECT EARTHING HAS BEEN CARRIED OUT: