MSS 500 Adveco Steel Buffers Instruction Manual

PRODUCT MANUAL
TR300003.r2
Adveco Steel Buffers
MSS 500 – 5000 Range

MSS 500 Adveco Steel Buffers

Installation, Operation, and Maintenance Manual

HOT WATER SPECIALISTS
Warnings
This manual should be read and understood prior to installation or operation of any Aveco MSS vessel. Failure to read this manual or follow its printed instructions may lead to personal injury, damage to the vessel and damage to the water heating. These instructions should be kept in a safe and accessible place near the vessel.
Vessels should be stored in a safe place prior to installation to prevent damage.
Copyright © 2020 Adveco Ltd. All rights reserved.
No part of this publication may be copied, reproduced, altered and/or published by any means without the prior written approval of Adveco Ltd.
Any brand names mentioned within this publication are registered trademarks of their respective owners.
Adveco Ltd. reserves the right to modify specifications in this manual at any time and without notification.
Adveco Ltd. accepts no liability for third party claims arising from unauthorised use and/or use other than as directed within this manual.
How to Use This Manual
All general information, instructions and specifications listed within this manual applies to the full range of MSS x00, x01 and x02 vessels. Any information relevant to only x01 or x02 vessels is contained within dedicated sections and is clearly identifiable by section titles.
For any queries or issues not covered by the scope of this manual, please contact the Adveco Technical Department using the contact details provided on page 16.

Product Description

Adveco MSS Range of Carbon Steel Vessels
The Adveco MSS range has been designed to serve as buffer vessels or thermal storage vessels within central heating installations. They feature a carbon steel shell with high and low level flow and return connections.
The MSS range is divided into three types of tank, based on the number of internal heat exchange coils supplied:
MSS x00 series vessels are supplied without any internal coils and are available as system buffer tanks with capacities from 500 to 5,000 litres;
MSS x01 vessels contain one carbon steel heating coil mounted in the lower half of the tank, allowing the vessel to serve as a thermal storage tank;
MSS x02 vessels contain two carbon steel heat exchange coils, mounted at high and low levels inside the tank, which can be connected to two separate system circuits or be combined to serve a single high grade heat source.
The complete MSS range is designed, manufactured, and tested in the EU to the requirements of:
The Pressure Equipment Directive
97/23/EC Article 3, Paragraph 3, Sound Engineering Practice.
The scope of 97/23/EC covers standards for the design and manufacture of pressure equipment, including vessels, piping, safety and other accessories, with a maximum allowable pressure greater than 0.5 bar. Vessels classified within the Sound Engineering Practice category of the Pressure Equipment Directive are exempt from, and do not feature, CE marking.
The standard range of MSS vessels includes the following models, as identified by the vessel data plate:

Installation Instructions

1. Responsibilities of the User
   Following the commissioning of a system and in compliance with the procedures and advice contained within this manual, responsibility lies with the building controller to maintain a safe standard of operation and regular maintenance procedures as required by any site risk assessment. This includes ensuring that the unit is not operated at temperatures or pressures in excess of those stated on the vessel data plate. Nor should the vessel be exposed to a full or partial vacuum, such as can be present during draw-off or drainage of the unit while the cold feed or vent are closed or obstructed.
   Failure to maintain a minimum of annual maintenance may void any and all warranties. Full maintenance procedures should only be carried out by a suitably qualified person. Basic maintenance regimes, as determined through site risk assessment, should be carried out by the user as directed on page

2. Aveco Ltd. advise that heating systems in unoccupied premises, or that are subjected to long periods of shutdown, should be drained down according to the procedure on page 12, to remove the risk of failure and/or damage occurring while the system is not being monitored.

3. Responsibilities of the Installer / Designer
   In compliance with the procedures and advice contained within this manual, responsibility lies with the installer to ensure that the vessels are correctly and safely installed in line with all local regulations and laws. In all cases, the relevant laws and regulations must take precedence over the instructions contained within this manual.
   The MSS range of carbon steel vessels are suitable for installation in unvented installations up to a maximum pressure of 5 bar.

4. Location and Handling 3.
   Suitable methods of moving a vessel include the use of a forklift truck where the vessel is securely fixed to a pallet capable of supporting its weight, or by boom crane using adequate textile slings of suitable capacity to lift the weight of the tank. For tank weight information, consult page 13. Vessels should not be lifted using the insulation, by chains, or by straps that may damage the insulation, connections, or walls of the tank. Care should be taken when moving or lifting to minimise the risk of damage to the vessel.
   The vessel is suitable for indoor installation only and must be positioned on a level base capable of supporting the unit when filled to capacity. Floor loading calculations should include the total filled weight, being equivalent to the sum of the empty weight of the vessel plus the water volume in litres of the tank (where 1 litre of water weighs 1 kg).
   Uninstallation should provide suitable clearances of no less than 800 mm on at least three sides of the unit in order to give adequate room for pipework. A height clearance of 150mm is required over the top of the vessel to accommodate the installation of an air vent. The vessel should be positioned to provide suitable access for visual inspection and maintenance of all connections, ancillaries, and fittings, as well as eventual replacement of the entire vessel.
   Any water storage vessel requires some provision against damage to surrounding infrastructure, electronics, and equipment in the event of a leak, damage, or vessel failure. Acceptable methods of protection include suitable bunding, gulley, drainage, or a leak detection and warning system.
   Additional precautions must be taken when the tank is installed in unheated spaces to prevent the risk of freezing.
   All tanks are provided with a 100 mm insulation jacket as standard. This can be easily removed via zipper if necessary to maneuver the vessel into location, however must be replaced before the cylinder is connected to any pipework.

5. Tank Connections: All Vessels
   Connections and sizes

   | Model MSS| 500| 500| 1000| 1500| 2000| 2500| 3000| 4000| 5000|
   | | 501| 501| 1001| 1501| 2001| 2501| 3001| 4001| 5001| Units
   Port| Purpose| 502| 502| 1002| 1502| 2002| 2502| 3002| 4002| 5002|
   mc| Flow from heat source| 1.25| 1.50| 1.50| 1.50| 2.00| 3.00| 3.00| 3.00| 3.00| inch
   rc| Return to heat source| 1.25| 1.50| 1.50| 1.50| 2.00| 3.00| 3.00| 3.00| 3.00| inch
   mi| Flow to system| 1.25| 1.50| 1.50| 1.50| 2.00| 3.00| 3.00| 3.00| 3.00| inch
   rp sc| Return from system / drain outlet| 1.25| 1.50| 1.50| 1.50| 2.00| 3.00| 3.00| 3.00| 3.00| inch
   ri| Extra return from system| 1.25| 1.25| 1.25| 1.25| 1.25| 1.25| 1.25| 1.25| 1.25| inch
   sa| Automatic air vent| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| inch
   sd| Sensor pockets| 0.50| 0.50| 0.50| 0.50| 0.50| 0.50| 0.50| 0.50| 0.50| inch
   g| Extra system connections| 1.25| 1.50| 1.50| 1.50| 2.00| 3.00| 3.00| 3.00| 3.00| inch
   g1| Extra system connection| 1.25| 1.25| 1.25| 1.25| 1.25| 1.25| 1.25| 1.25| 1.25| inch

6. Tank Connections: x01 and x02 Coils
   Connections and sizes: x01| MSS 501| MSS 801| MSS 1001| MSS 1501| MSS 2001| MSS 2501| MSS 3001| MSS 4001| MSS 5001| Units
   ---|---|---|---|---|---|---|---|---|---|---
   Port| Purpose
   bi| Bottom coil inlet| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| inch
   bo| Bottom coil outlet| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| inch
   Connections and sizes: x02| MSS 502| MSS 802| MSS 1002| MSS 1502| MSS 2002| MSS 2502| MSS 3002| MSS 4002| MSS 5002| Units
   ---|---|---|---|---|---|---|---|---|---|---
   Port| Purpose
   ti| Top coil inlet| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| inch
   to| Top coil outlet| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| inch
   bi| Bottom coil inlet| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| inch
   bo| Bottom coil outlet| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| 1.00| inch

7. Primary Installation Procedure
   Prior to the connection of primary pipework and ancillaries, the vessel should first be maneuvered into its final position in accordance with the guidance on page 6.
   Isolation valves should be fitted to the vessel (except on connections to the vent or any pressure relief valves) prior to installation of any pipework connections. Connections to the vessel should be made according to the locations and sizes denoted on pages 7 – 8 and pages 12 – 13. All pipework should be of an appropriate, non-corrosive material, and should be supported outside the vessel to prevent excessive load bearing upon the tank connection points. Pipework should be arranged to facilitate suitable access to system components. Any flanged connections to the vessel must be tightened in a diametrically opposed sequence to prevent uneven loads across the connection.
   The MSS range requires a top-mounted automatic air vent designed to facilitate the release of air from sealed systems during filling and standard operation. A manual air vent should be installed in addition to this feature. Discharge pipework from pressure relief valves should follow the regulations defined on page 10.
   Expansion vessels must be positioned on the return side of a system, and should be appropriately sized to accommodate approximately 10% of the total heating system volume. The Adveco Application Design Department can provide a detailed expansion calculation upon request to verify the required size of expansion vessels, or for systems operating at specific pressures.
   A drain should be installed on the lowest connection to the cylinder, as identified on page 7. The drain valve should be of suitable size to allow draining of the tank in a reasonable amount of time. Itis recommended that a quarter-turn lever valve and plug or cap are used and that the valve size be one size smaller than the return feed connection size. A suitable drain or gulley should be provided to allow safe draining of the tank.
   x02 Vessels
   The MSS x02 range of vessels feature two separate steel heat exchange coils. When used with two heat sources, the lower grade heat source should be piped into the bottom heating coil, and the higher grade or more reliable heat source should be piped into the top coil. The two coils may alternatively be used as heat outputs, in which case the high level coil should be used for a high temperature output, and the low level coil should be used as a low temperature output.
   The two heating coils may be combined for use with a larger capacity system with a single high grade heat source, by connecting the outlet of the top coil to the inlet of the bottom coil by external pipework. To estimate the kW capacity of the combined coil arrangement based for an 80/60°C primary flow and return temperature, sum the kW capacity of the top coil at 80°C and the kW capacity of the bottom coil at 70°C. For further technical details on coil capacities at 70°C, at different temperatures, or if a more accurate calculation is required, please consult the Aveco Application Design Department using the details provided on page 16.

8. Discharge Pipework
   Discharge from relief valves
   Discharge pipework requirements for the UK are found in Building Regulations Part G. They are summarized here but it is recommended to read the regulations in full at http://www.planningportal.gov.uk/buildingregulations/approveddoc- unmints/part/approved
   D1, the pipe from the relief valve to the air break, must have the same diameter as the valve, must be metal, and must be no longer than 600mm. An airbrake, such as a tannish or a funnel, must be installed at the end of D1.
   D2, the pipe from the air break to termination, must be at least one size larger than D1, must have at least 300mm vertical drop before a bend, and must have a continuous fall. It should typically be metal, but PP is acceptable (note: PP is push-fit plastic. ABS and PVC solvent welded plastics are not suitable).
   If D2 is longer than 9m total equivalent length (based on 1.4m per bend), then its diameter must be increased. Please refer to Building Regulation G3 at http://www.planningportal.gov.uk/buildingregulations/ . If a number of D2 pipes are combined, the diameter of the common pipe should be one size larger than the biggest D2 pipe.
   D2 should be terminated in one of the following ways:
   D2 should be terminated in one of the following ways:
   • Into a soil stack, suitable for the temperature, with a mechanical seal, and with no sanitary appliances on it and a warning not to use the pipe for sanitary appliances.
   • Into a trapped gulley with the pipe end below the grate but above the water seal.
   • Terminating at low level to a suitable external ground level surface with a guard around the pipe end and that end within 100mm of the ground
   • At high level into a suitable hopper or onto a roof that can withstand the temperature and does not have plastic guttering within 3m of the discharge and does not create a risk to people below.

9. Water Quality
   If the system includes a pressurisation unit, then a water meter is also required.
   In order to prevent material corrosion within a central heating installation, the quality of input water must be taken into consideration. All filling water must meet the specifications outlined below. Water that does not meet these specifications should be sufficiently treated to the extent that it does. Failure to comply with water quality requirements may invalidate warranties on any or all components within an MSS vessel installation.

• The system should only be filled using potable or softened water. Groundwater and demineralized (demi- or distilled) water should not be used.

• For systems containing aluminium, the water pH level must be between 7.5 and 8.5.  The ideal pH is 8.3.

• For mixed-metal systems not containing aluminium, the water pH level should be between 9.0 and 10.0.  The ideal pH is 9.8.

• System water should have a maximum conductivity at 20°C of 2500 µS/cm.

• System water should have a maximum iron content of 0.2 ppm.

•  In hard water areas, consideration should be given to filling the system with softened water to prevent scale build- up.  Refer to the boiler manufacturer’s literature for limits on hardness.

• There must be no capacity for oxygen diffusion into the system during operation.

• The system should be cleared of debris and dirt before use.  This can be achieved by installation of a filter, or if this is not possible, by flushing with suitable water.  No solid substances or residues should be present in the system water.

• Annual input of fresh water should not exceed 5% of the total system volume. This includes requirements of water input during maintenance, such as the recharging of expansion vessels.

• The addition of chemicals to the water should only be considered after reviewing the boiler manufacturer’s   literature.

• The addition of antifreeze and/or other additives necessitates the need for regular water quality checks, to meet the requirements imposed by the additive supplier(s).  Aveco Ltd. recommends that records are kept of any additions to the system water and of water quality checks performed.  Further advice on suggested corrosion   inhibitors, anti-freeze or system cleaner additives is available by contacting the Aveco Technical Department.

Maintenance Operations

While full maintenance and cleaning of vessels should only be carried out by a qualified operative, there is regular system maintenance that must be carried out more frequently and can be done by the building controller’s nominated person.
The more involved maintenance regime of a tank will vary from site to site depending on water conditions and use.
Maintenance must take place at least yearly, but more frequent visits may be required depending on the condition of the unit after one year. The maintenance of a tank involves checking the system and cleaning the tank.
Checks to carry out:
Any thermostats present are functional and properly calibrated.
All relief valves operate and discharge correctly.
The heating system expansion vessel pressure is equal to the heating system pressure (checked when there is no pressure on the water side of the diaphragm). Recharge as appropriate.
All valves have free travel.
The system has no leaks. Particular attention should be paid to tank connections and air relief valves.
The heating system is correctly dosed with inhibitors.
Cleaning:
All filters should be cleaned.
Drainage Procedure:
Turn off all heat sources connected to the vessel.
Turn off any system pumps and isolate all connections to and from the vessel.
Ensure that the vessel drain connection is connected to, or positioned over, a drain or gulley. Open the drain valve connection to release the pressure within the vessel.
Open a safety valve or remove automatic air vent connection to allow air into the unit and prevent negative pressure build-up during drainage.
Allow the vessel to fully drain via the drain valve connection.
It may also be required to drain any coils within the vessel. This should be done using a drain point located on the connecting pipework.
Technical Specifications: All Vessels

Dimensions

Model| MSS 50x| MSS 80x| MSS 100x| MSS 150x| MSS 200x| MSS 250x| MSS 300x| MSS 400x| MSS 500x
---|---|---|---|---|---|---|---|---|---
Do| 850| 990| 1050| 1240| 1340| 1400| 1550| 1600| 1800
Di| 650| 790| 850| 1000| 1100| 1200| 1350| 1400| 1600
A| 1700| 1740| 2030| 2120| 2450| 2635| 2810| 2900| 2960
B| 1360| 1370| 1640| 1685| 2000| 2155| 2195| 2285| 2400
C| 895| 945| 1080| 1105| 1275| 1555| 1525| 1485| 1600
E| 695| 745| 880| 905| 1075| 1155| 1125| 1285| 1400
F| 290| 320| 340| 385| 400| 555| 455| 485| 600
H| 600| 610| 880| 925| 1240| 1335| 1315| 1455| 1590
I| 1210| 1220| 1490| 1535| 1850| 1945| 1925| 2065| 2200

All dimensions shown in mm. For connection descriptions and sizes, consult pages 9-10.
Vessel Specifications

Model| MSS 50x| MSS 80x| MSS 100x| MSS 150x| MSS 200x| MSS 250x| MSS 300x| MSS 400x| MSS 500x
---|---|---|---|---|---|---|---|---|---
Litres| 489| 723| 1008| 1449| 2054| 2328| 2941| 3796| 5024
Maximum working pressure (bar)| 6| 6| 6| 6| 6| 6| 6| 6| 6
Maximum working temperature (°C)| 95| 95| 95| 95| 95| 95| 95| 95| 95
x00 Dry mass (kg) x01 x02| 80
105
126| 115
140
160| 135
180
215| 170
230
270| 240
310
350| 290
335
370| 300
345
390| 450
490
535| 580
630
680
Standing losses*
(kWh/24h)| 2.41| 2.89| 3.43| 3.79| 4.56| 4.99| 8.30| 9.71| 11.50

*Insulation specification: 100 mm rigid (500-800L) or flexible (1000-5000L) polyurethane foam with removable outer PVC jacket. 1500-2000L tanks feature additional 20mm closed cell elastomeric foam underlay. Flexible polyurethane thermal conductivity λ = 0.0456 W/m° C
Technical Specifications: x01 and x02 Vessels Only

(x02 only)
MSS 501/502| 290| 770| 930| 1230| 2.1| 1.2
MSS 801/802| 320| 810| 950| 1220| 2.7| 1.5
MSS 1001/1002| 340| 1020| 1120| 1640| 4.0| 3.0
MSS 1501/1502| 385| 1065| 1205| 1685| 5.0| 3.5
MSS 2001/2002| 400| 1160| 1520| 2000| 5.0| 4.0
MSS 2501/2502| 555| 1155| 1755| 2155| 5.0| 4.2
MSS 3001/3002| 455| 1275| 1985| 2295| 6.0| 4.2
MSS 4001/4002| 485| 1275| 1930| 2370| 7.0| 5.0
MSS 5001/5002| 600| 1320| 2000| 2400| 8.0| 5.0
Coil Specifications| Steel heating coils
---|---
Surface area (m2)| 1.2| 1.5| 2.1| 2.7| 3.0| 3.5| 4.0| 4.2| 5.0| 6.0| 7.0| 8.0
Nominal capacity (kW)| 12| 15| 21| 27| 30| 35| 40| 42| 50| 60| 70| 80
Maximum temperature (°C)| 95| 95| 95| 95| 95| 95| 95| 95| 95| 95| 95| 95
Maximum pressure (bar)| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9
Pressure drop per unit area (m WC/m2)| 0.04| 0.06| 0.11| 0.18| 0.21| 0.28| 0.37| 0.40| 0.56| 0.78| 1.04| 1.34
Coil volume (l)| 9.2| 10.9| 15.0| 19.2| 20.9| 24.8| 28.4| 29.8| 35.5| 42.6| 49.7| 56.8
Coil flow rate (l/s)| 0.15| 0.18| 0.26| 0.33| 0.37| 0.43| 0.49| 0.51| 0.61| 0.73| 0.86| 0.98

Steel heating coil data based on 80/60°C primary flow/return temperatures with a 50°C tank temperature.

Spares and Ancillaries Information

Ancillaries

Item Description| Product Code
Buffer Installation Kit Includes AAV and valves for buffer vessel on primary side; valves and flow measurement device for pump commissioning; 2x T&P gauges for building flow and return.| 1.0”: MB0017
1.5”: MB0018
2.0”: MB0019
Spares

Item Description| Product Code
Control Thermostat 0-70°C Thermostat supplied with 0.5” pocket|

E0008

Overheat Thermostat 95°C Thermostat supplied with 0.5” pocket 95°C Capilliary thermostat suitable for multiple pocket| E0009 E0011
Single Pocket 0.5”| E0009.1
Multiple Pocket Long 0.5”| E0009.4
Temperature & Pressure Gauge0-6 bar; 0-120°C; 80 mm dial. Self-sealing 0.5” wet pocket| M0011
Automatic Air Vent 0.5”| P0022

Further valves and spares available from Adveco upon request

Contact Details and Warranty Information

The Adveco MSS range, this manual, and all information contained within, are supplied by Adveco Ltd.
Adveco Ltd.
Unit 7&8 Armstrong Mall,
Southwood Business Park,
Farnborough,
Hampshire,
GU14 0NR
T: 01252 551 540
enquiries@adveco.co
www.adveco.co
The Adveco MSS range is provided with a 5 year vessel warranty reliant upon the following conditions:

• The vessel is correctly and safely stored, installed, and used as instructed by this manual.
• The vessel is used exclusively with water that satisfies the quality conditions as described on page 11 of this manual, or an approved glycol solution.
• The heating system is kept in a good condition and is suitably maintained, inclusive of maintenance of the vessel as directed on page 12 of this manual.
• The vessel has not been altered, tampered with, and has not been subjected to damage from frost, vacuum, or external influence.

Exclusions to warranty conditions:

• Consequential damage arising from malfunction, failure, or leaks associated with the MSS vessel.
• Failure or damage of the vessel or heating system arising from the build up of excessive scale.
• Any parts and labour charges associated with maintenance, repair, or replacement of the vessel.

For further information and warranty claims, please contact Adveco Ltd. through the details listed on this page.
Adveco Sales Department T: 01252 551 540 Option 1
E: Sales@adveco.co
Adveco Technical Department T: 01252 551 540 Option 4
E: Technical@adveco.co
Adveco Service & Commissioning Department
T: 01252 551 540 Option 6
E: Service@adveco.co
Adveco Spares Department
T: 01252 551 540 Option 3
E: Spares@adveco.co
Adveco Design Department
T: 01252 551 540 Option 5
E: Technical@adveco.co
Adveco also offer the following products and services:

• Bespoke system design
• Maintenance and service packages
• Buffer tanks
• Indirect and direct hot water systems
• Off site manufacturing of skids and plant rooms
• Controls Systems
• Packaged plate heat exchangers
• Solar thermal systems
• Gas fired heating systems
• Combined heat & power cogeneration systems

Adveco Ltd. Unit 7&8 Armstrong Mall,
Southwood Business Park,
Farnborough, Hampshire GU14 0NR
Company Reg : 09493966
T : 01252 551 540
E : enquiries@adveco.co
I : www.adveco.co

References

• Building regulations approval: When you need approval - GOV.UK

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