ST 2000 - Boiler A.O. Smith - Free user manual and instructions

USER MANUAL ST 2000 A.O. Smith

Read this manual carefully

Warning Read this manual carefully before starting the storage tank. Failure to read the manual and to follow the printed instructions may lead to personal injury and damage to the storage tank. Copyright © 2011 A.O. Smith Water Products Company All rights reserved. Nothing from this publication may be copied, reproduced and/or published by means of printing, photocopying or by whatsoever means, without the prior written approval of A.O. Smith Water Products Company.

A.O. Smith Water Products Company reserves the right to modify specifications stated in this manual.

Any brand names mentioned in this manual are registered trademarks of their respective owners.

A.O. Smith Water Products Company accepts no liability for claims from third parties arising from unauthorised use, use other than that stated in this manual, and use other than in accordance with the General Conditions registered at the Chamber of Commerce.

Refer further to the General Conditions. These are available on request, free of charge. Although considerable care has been taken to ensure a correct and suitably comprehensive description of all relevant components, the manual may nonetheless contain errors and inaccuracies. Should you detect any errors or inaccuracies in the manual, we would be grateful if you would inform us. This helps us to further improve our documentation.

If you have any comments or queries concerning specific aspects related to the storage tank, then please do not hesitate to contact:

A.O. Smith Water Products Company: PO Box 70 5500 AB Veldhoven The Netherlands Telephone: (free) 0870 - AOSMITH 0870 - 267 64 84 General: [phone] Fax: [phone] E-mail: [e-mail] Website: www.aosmith.co.uk In the event of problems with your gas, electricity or water supply connections, please contact the supplier/installation engineer of your installation.ST 1500 / 2000 / 2500 / 3000

1 Technical specifications

1.2 Water composition

Allow for the storage tank's weight and the maximum floor load; refer to the table (1.4 "General specifications").

The storage tank is intended for heating drinking water. The drinking water must comply with the regulations governing drinking water for human consumption. The table gives an overview of the specifications.

• French hardness > 10,0 °fH

• English hardness > 7,0 °eH

Note If the water specifications deviate from those stated in the table, then the tank protection cannot be guaranteed (4"Warranty").

For access to the storage tank, it is recommended that the following clearances are observed:

around the anode connection: 100 cm.

around the storage tank: 50 cm.

top of the storage tank: 50 cm

Height of cold water connection

Height of hot water connection

Diameter cleaning opening

Height cleaning opening

Important Three anodes are delivered with the storage tank. Mount the anodes with a liquid sealant in the right connections (8) before installation. When anodes are not mounted during operation, all warranty conditions are void.

2.1 Installation diagram This figure shows the installation diagram. This diagram is referred to in the sections

(mandatory if mains water pressure is too high)

3. T&P-valve (mandatory)

4. stop valve (recommended)

5. non-return valve (mandatory)

11. service stop valve

15. expansion valve (mandatory)

16. expansion vessel (mandatory)

17. 3-way aeration valve (recommended)

18. cold water head tank

Warning The installation should be carried out by a competent person, in compliance with general and locally applicable regulations.

Cold water side See (A) in the installation diagram (2.1 "Installation diagram").

1. Fit an approved stop valve (4) on the cold water side as required by the applicable

2. The maximum working pressure of the storage tank is 8 bar. Because the pressure in the

water pipe at times can exceed 8 bar, you must fit an approved pressure-reducing valve (1).

3. Fit a non-return valve (5) and an expansion vessel (16).

4. Fit an expansion valve (15) and connect the overflow side to an open waste water pipe.

Hot Water side See (B) in the installation diagram (2.1 "Installation diagram"). Note Insulating long hot water pipes prevents unnecessary energy loss.

Optional: fit a temperature gauge (12) so you can check the temperature of the tap water.

Fit a stop valve (11) in the hot water outlet pipe for servicing.

Circulation pipe See (C) in the installation diagram (2.1 "Installation diagram"). If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort, and reduces water wastage.

1. Fit a circulation pump (6) of the correct capacity for the length and resistance of the

2. Fit a non-return valve (5) after the circulation pump to guarantee the direction of

3. Fit two stop valves for servicing (4).

4. Connect the circulation pipe according to the installation diagram (2.1 "Installation

Warning The installation should be carried out by a competent person, in compliance with general and locally applicable regulations.

Cold water side See (A) in the installation diagram (2.1 "Installation diagram").

1. Fit an approved stop valve (4) on the cold water side between the cold water head tank

and the storage tank, as required by the applicable regulations.ST 1500 / 2000 / 2500 / 3000

Hot Water side See (B) in the installation diagram (2.1 "Installation diagram"). Note Insulating long hot water pipes prevents unnecessary energy loss.

1. Optional: fit a temperature gauge (12) so you can check the temperature of the tap

3. Fit a stop valve (4) in the hot water outlet pipe for servicing.

4. If a circulation pipe is required, continue by installing the circulation pipe (2.3.3.

“Circulation pipe").

Circulation pipe See (C) in the installation diagram (2.1 "Installation diagram"). If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort, and reduces water wastage.

1. Fit a circulation pump (6) of the correct capacity for the length and resistance of the

2. Fit a non-return valve (5) after the circulation pump to guarantee the direction of

3. Fit two stop valves for servicing (4).

4. Connect the circulation pipe according to the installation diagram (2.1 "Installation

Warning Maintenance may only be carried out by a competent person. At each service, the storage tank undergoes maintenance on water side. The maintenance must be carried out in the following order.

1. Preparation for maintenance

2. Water-side maintenance

3. Finalising maintenance

Note Before ordering spare parts, it is important to write down the installation type, storage tank model and the full serial number of the storage tank. These details can be found on the rating plate. Only by ordering with this information can you be sure receiving the correct spare parts.

The preparation for maintenance consists of testing and checking if all components are still working properly by completing the following steps:

1. Test the operation of the overflow valve of the protected cold supply setup. The water

should discharge out.

2. Check the drainage pipes from the discharge points of all valves and remove any scale

deposits that may be present.

3. Drain the storage tank.

Water-side maintenance consists of descaling and cleaning the tank and checking the anodes.

Descaling and cleaning the tank Scale and lime build-up prevent effective conduction of the heat to the water. Periodic cleaning and descaling prevents build-up of these deposits. This increases the service life of the storage tank, and also improves the heating process. Take the rate of scale formation into account when deciding on the service interval. Scale formation depends on the local water composition, the water consumption and the water temperature setting. A water temperature setting of maximum 60°C is recommended for the prevention of excessive scale build-up. To guarantee a good, watertight seal around the cleaning opening, replace the gasket, washers, bolts and, if necessary, the lid with new parts before reassembly. Spare parts are obtainable from the supplier/manufacturer. To simplify descaling and cleaning of the tank, the storage tank is equipped with a cleaning opening.ST 1500 / 2000 / 2500 / 3000

1. Undo bolts from the cover.

2. Remove cover and the gasket.

3. Inspect the tank and remove the loose scale deposits and contamination.

4. If the scale cannot be removed by hand, descale the storage tank with a descaling

agent. Contact the supplier/manufacturer for advice on what descaling agent to use.

5. Close the cleaning opening. To avoid damage to the tank, tighten the bolts, that fasten

the lid, with a torque no greater than 50 Nm. Use suitable tools for this.

Checking anodes Anodes ensure the protection of the tank by sacrificing themselves. Insufficient anode material may lead to poor protection and, hence, leakage of the tank.

1. Loosen the anodes one by one.

2. Check the diameter of each anode in different places. The diameter must be at least

60% of the original 1” diameter.

3. If the diameter is less than the minimum, the anode must be replaced. Please contact

the supplier/manufacturer to order new anodes.

4.1 General warranty

installation and use

If within one year of the original installation date of a storage tank supplied by A.O. Smith, following verification, and at the sole discretion of A.O. Smith, an assembly or part (with exclusion of the tank) proves to be defective or fails to function correctly due to manufacturing and/or material defects, then A.O. Smith shall repair or replace this assembly or part.

If within 3 years of the original installation date of a storage tank supplied by A.O. Smith, following verification, and at the sole discretion of A.O. Smith, the glass-lined steel tank proves to be leaking due to rust or corrosion occurring on the water side, then A.O. Smith shall offer to replace the defective storage tank with an entirely new storage tank of equivalent size and quality The warranty period given on the replacement storage tank shall be equal to the remaining warranty period of the original storage tank that was supplied. Notwithstanding that stated earlier in this article, in the event that unfiltered or softened water is used, or allowed to stand in the storage tank, the warranty shall be reduced to one year from the original installation date.

The warranty set out in articles 1 and 2 will apply solely under the following conditions: a. The storage tank is installed under strict adherence to A.O. Smith installation instructions for the specific model, and the relevant government and local authority installation and building codes, rules and regulations in force at the time of installation. b. The storage tank remains installed at the original site of installation. c. The storage tank is used exclusively with drinking water, which at all times can freely circulate (a separately installed heat exchanger is mandatory for heating saline water or corrosive water). d. The tank is safeguarded against harmful scaling and lime build-up by means of periodic maintenance. e. The water temperatures in the heater do not exceed the maximum setting. f. The water pressure and/or heat load do not exceed the maximum values stated on the storage tank rating plate. g. The storage tank is installed in a non-corrosive atmosphere or environment. h. The storage tank is connected to a protected cold supply arrangement, which is: approved by the relevant authority; with sufficient capacity for this purpose; supplying a pressure no greater than the working pressure stated on the indirect storage tank; and where applicable by a likewise approved temperature and pressure relief valve, fitted in accordance with installation instructions of A.O. Smith applying to the specific model of storage tank, and further in compliance with the government and local authority installation and building codes, rules and regulations.

i. The storage tank is at all times fitted with cathodic protection. If sacrificial anodes are

used for this, these must be replaced and renewed when, and as soon as, they are 60% or more consumed. When power anodes are used, it is important to ensure that they continue to work properly.

The warranty set out in articles 1 and 2 will not apply in the event of: a. damage to the storage tank caused by an external factor; b. misuse, neglect (including frost damage), modification, incorrect and/or unauthorised use of the storage tank and any attempt to repair leaks; c. contaminants or other substances having been allowed to enter the tank; d. the conductivity of the water being less than 125 µS/cm and/or the hardness (alkaline- earth ions) of the water being less than 1.00 mmol/l; e. unfiltered, recirculated water flowing through or being stored in the storage tank; f. any attempts at repair to a defective storage tank other than by an approved service engineer.ST 1500 / 2000 / 2500 / 3000

The obligations of A.O. Smith pursuant to the specified warranty are limited to free delivery from the warehouse of the replacement assemblies, parts or storage tank, respectively. Shipping, labour, installation and any other costs associated with the replacement will not be accepted by A.O. Smith.

A claim on grounds of the specified warranty must be submitted to the dealer from whom the storage tank was purchased, or to another authorised dealer for A.O. Smith Water Products Company products. Inspection of the storage tank as referred to in articles 1 and 2 shall take place in one of the laboratories of A.O. Smith.

A.O. Smith grants no other warranty or guarantee over its storage tanks nor the (assemblies or parts of) storage tanks supplied for replacement, other than the warranty expressly set out in this Certificate. Under the terms of the supplied warranty, A.O. Smith is not liable for damage to persons or property caused by (assemblies or parts, or the glass-lined steel tank of) a (replacement) storage tank that it has supplied.ST 1500 / 2000 / 2500 / 3000