LSTR Direct Storage Vessel

Manual Guidance

Warning: Read this manual carefully before starting with the installation of the storage vessel. Failure to read the manual and to follow the printed instructions may lead to personal injury and damage to the storage vessel.

Copyright: © 2023. All rights reserved.

No part of this publication may be copied, reproduced, or published without the prior written approval of the supplier. The supplier reserves the right to modify specifications.

Trademarks: Any brand names mentioned are registered trademarks of their respective owners.

Liability: The supplier accepts no liability for claims arising from unauthorized use, use other than stated in this manual, or use not in accordance with the General Conditions registered at the Chamber of Commerce. Refer to General Conditions for details, available on request.

Feedback: While considerable care has been taken to ensure accuracy, the manual may contain errors. Feedback on any errors or inaccuracies is appreciated to improve documentation.

More Information: For comments or queries, please contact the supplier. For water supply connection problems, contact the supplier and/or installation engineer.

Regulations: For unvented system installations, follow guidance from BS6700, BS8558, and comply with Building Regulations 1992: Part G3 (England/Wales), P5 (Northern Ireland), P3 (Scotland), Water Supply (Water Fittings) Regulations 1999, Water Supply (Water Quality) Regulations (Northern Ireland) 2017, and Public Water Supplies (Scotland) Amendment Regulations 2017. A kit of parts is available from Lochinvar.

Technical Specifications

1.1 Floor Load

Allow for the storage vessel's weight and the maximum floor load; refer to table 1.5 "General specifications".

1.2 Working Clearance

Recommended clearances for access:

• Around anode connection: 100 cm
• Around vessel: 50 cm
• Top of vessel: 50 cm

Note: Any leakage can cause damage. Install above a waste water drain or in a suitable metal leak tray with a drain and dimensions at least 5 cm larger than the vessel diameter.

1.3 Packaging

Packaging prevents transport damage and uses environmentally friendly, recyclable materials.

1.4 Disposal

Dispose of old appliances according to local legislation for electrical and electronic equipment. Do not mix with regular waste. Consult dealer/installation engineer if needed. Keep out of reach of children.

1.5 General Specifications

1.6 Dimensions

Dimensioned Sketch

Diagram description: A schematic drawing of the LSTR Direct Storage Vessel showing various connection points and dimensions labeled with letters and numbers. Key labels include A (Total height), D (Diameter), J, K, L, M, N, P, S, T, W, X, Y (various heights for connections and features), and numbered connections (1-6, 10) indicating pipe sizes and types (e.g., Rp 1/4", R 1 1/2"). The diagram illustrates the internal layout and external dimensions relevant for installation.

Installation

Note: This manual covers unvented installations only. For vented installations, contact the supplier.

2.1 Installation Diagram

Diagram description: The installation diagram illustrates the typical setup for an unvented storage vessel. It shows connections for cold water supply (A), hot water supply (B), and circulation pipe (C). Key components are labeled with numbers: 1 (pressure relief valve), 3 (T&P-valve), 4 (stop valve), 5 (non-return valve), 6 (circulation pump - optional), 9 (drain valve), 11 (service stop valve), 12 (temperature gauge - optional), 14 (draw-off points), 15 (expansion valve), and 16 (expansion vessel). The diagram depicts how these components are plumbed into the system, including safety features like pressure relief and expansion.

2.2 Water Connections

Warning: Installation must be performed by a competent person, adhering to general and local regulations.

2.2.1 Cold Water Side

Refer to diagram (A).

1. Fit an approved stop valve (4) on the water supply side as per regulations.
2. The vessel's maximum working pressure is 10 bar. Install an approved pressure-reducing valve (1) if the water pipe pressure may exceed 10 bar.
3. Fit a non-return valve (5) and an expansion vessel (16).
4. Fit an expansion valve (15) and connect its overflow to an open waste water pipe.

2.2.2 Hot Water Side

Refer to diagram (B).

Note: Insulating long hot water pipes prevents energy loss.

1. Optional: Fit a temperature gauge (12) to monitor tap water temperature.
2. Fit the T&P valve (3).
3. Fit a stop valve (11) in the hot water outlet pipe for servicing.

2.2.3 Circulation Pipe

Refer to diagram (C).

A circulation pump can be installed for immediate hot water flow, improving comfort and reducing water wastage.

1. Fit a circulation pump (6) with appropriate capacity for the circulation system's length and resistance.
2. Fit a non-return valve (5) after the circulation pump to ensure correct circulation direction.
3. Fit two stop valves (4) for servicing.
4. Connect the circulation pipe as shown in the installation diagram.

Filling and Draining

Note: This manual covers unvented installations only. For vented installations, contact the supplier.

3.1 Filling

Follow these steps to fill the water heater:

1. Open the stop valve (11) in the hot water pipe and any stop valves (4) for the circulation pump (6).
2. Close the drain valve (9).
3. Open the nearest hot water draw-off point (14).
4. Open the stop valve (4) on the cold water side (A) to allow cold water into the heater.
5. Fill the heater completely. A full water jet from the draw-off point indicates it is full.
6. Bleed air from the entire installation by opening all draw-off points.
7. The heater is now under water supply pressure. No water should leak from the expansion valve or T&P valve (3). If leaks occur, check:
   • Water supply pressure exceeding the specified value (refer to 1.6 "General specifications"). Fit a pressure-reducing valve (1) if necessary.
   • Defective or incorrectly fitted expansion valve in the cold supply setup.

3.2 Draining

1. Close the stop valve (4) between the cold water head tank and the cold water inlet (A).
2. Open the drain valve (9).
3. Bleed the water heater (or installation) to ensure complete draining.

Maintenance

Warning: Maintenance must only be carried out by a competent person.

The storage vessel requires water-side maintenance at each service, following this order:

1. Preparation for maintenance
2. Water-side maintenance
3. Finalising maintenance

Note: Before ordering spare parts, record the installation type, model, and serial number from the rating plate.

4.1 Preparation for Maintenance

This involves testing and checking component functionality:

1. Test the overflow valve of the protected cold supply setup.
2. Check drainage pipes from discharge points and remove scale deposits.
3. Drain the storage vessel.

4.2 Water-side Maintenance

This includes descaling and cleaning the tank, and checking the anode.

4.2.1 Descaling and Cleaning the Tank

Scale and lime build-up reduce heat conduction. Periodic cleaning and descaling prevents this, extending vessel life and improving heating. Consider scale formation rate based on local water composition, consumption, and temperature. A maximum water temperature of 60°C is recommended to prevent excessive scale build-up.

Replace the gasket, washers, and bolts for a watertight seal during reassembly. Spare parts are available from the supplier/manufacturer.

The vessel has a cleaning opening for easier maintenance.

Work Order:

1. Undo bolts from the cover.
2. Remove cover and gasket.
3. Inspect tank and remove loose scale/contamination.
4. If scale is stubborn, use a descaling agent. Consult supplier/manufacturer for advice on the correct agent.
5. Close the cleaning opening. Tighten lid bolts to a maximum torque of 50 Nm to prevent tank damage. Use appropriate tools.

4.2.2 Checking Anode

Anodes protect the tank sacrificially. Insufficient anode material can lead to poor protection and leakage.

1. Loosen anodes one by one.
2. Check the diameter of each anode. It must be at least 60% of its original diameter.
3. If the diameter is below the minimum, replace the anode. Contact the supplier/manufacturer for new anodes.
4. Mount the new anode.

Warranty

5.1 General Warranty

Within 1 year of invoice/commissioning date, Lochinvar Ltd will repair or replace defective assemblies or parts (excluding the tank) due to manufacturing or material defects, subject to verification and sole discretion.

5.2 Tank Warranty

Within 3 years of invoice/commissioning date, if the enamel-lined steel tank leaks due to rust or corrosion on the water side, Lochinvar Ltd will offer to replace the defective vessel with a new one of equivalent size and quality. The warranty period for the replacement vessel will match the remaining period of the original vessel.

5.3 Conditions for Installation and Use

The warranty applies only if:

• Installation strictly follows Lochinvar Ltd instructions and complies with relevant Gas Safety Regulations, Building Regulations, I.E.E. Regulations, local water authority byelaws, gas distributor, and local authority requirements.
• The vessel remains installed at its original site.
• The vessel is used exclusively with drinking water that circulates freely. A separate heat exchanger is mandatory for saline or corrosive water.
• The tank is protected against scaling and lime build-up through periodic maintenance.
• Water temperatures do not exceed the thermostat maximum settings.
• Water pressure and/or heat load do not exceed maximum values on the vessel's rating plate.
• The vessel is installed in a non-corrosive atmosphere or environment.
• The vessel is connected to a protected cold supply arrangement approved by the relevant authority, with sufficient capacity, supplying pressure no greater than the vessel's working pressure, and fitted with an approved temperature and pressure relief valve in accordance with instructions and regulations.
• The vessel is fitted with cathodic protection. If sacrificial anodes show more than 40% reduction in size or pitting, they must be replaced. Check anode ends for localized depletion. Clean anodes covered with particles. New anodes have a 21 mm diameter. Ensure power anodes are functioning correctly.

5.4 Exclusions

The warranty does not apply in cases of:

• Damage from external factors.
• Misuse, neglect (including frost damage), modification, or unauthorized use.
• Contaminants or other substances entering the tank.
• Repair attempts by unauthorized personnel.

5.5 Scope of Warranty

Lochinvar Ltd's warranty obligations are limited to the free delivery of replacement assemblies, parts, or vessels from their warehouse. Labor, installation, and associated costs are not covered.

5.6 Claims

Warranty claims must be submitted to the dealer from whom the vessel was purchased or another authorized Lochinvar Ltd dealer. Inspection will take place in Lochinvar Ltd laboratories.

5.7 Obligations of Lochinvar Ltd

Lochinvar Ltd provides no other warranty beyond what is expressly stated. Lochinvar Ltd is not liable for damage to persons or property caused by supplied vessels, assemblies, or parts.