Lochinvar LST 330 G E Guide

Installation, Commissioning,
User & Maintenance Instructions
LV 312749 | June 2022
0312749 R2.1 / 2622 - Changes Reserved
LST
Direct Storage Vessel
Models:
LST 330 G E
LST 440 G E
LST 550 G E
LST 660 G E

These instructions must be read and understood before installing, commissioning, operating
or maintaining the equipment.
IMPORTANT INFORMATION
!

0312749_LST_330-660_UK_V2.1, 2022-06-27 3
Read this manual
carefully
Trademarks
Liability
More information
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 © 2022
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 the
supplier.
The supplier reserves the right to modify specifications stated in this manual.
Any brand names mentioned in this manual are registered trademarks of their respective
owners.
The supplier 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
vessel, then please do not hesitate to contact the supplier.
In the event of problems with your water supply connections, please contact the supplier
and/or installation engineer of your installation.

4 Installation, Commissioning, User & Maintenance Instructions

0312749_LST_330-660_UK_V2.1, 2022-06-27 5
Table of contents
1
1.1
1.2
1.3
1.4
1.5
1.6
2
2.1
2.2
3
3.1
3.2
4
4.1
4.2
5
Technical specifications .............................................................................................. 7
Floor load ....................................................................................................................... 7
Working clearance .......................................................................................................... 7
Packaging ....................................................................................................................... 7
Disposal .......................................................................................................................... 7
General specifications .................................................................................................... 7
Dimensions ..................................................................................................................... 8
Installation ..................................................................................................................... 9
Installation diagram ........................................................................................................ 9
Water connections ........................................................................................................ 10
Filling and Draining .................................................................................................... 11
Filling ............................................................................................................................ 11
Draining ........................................................................................................................ 12
Maintenance ................................................................................................................ 13
Preparation for maintenance ........................................................................................ 13
Water-side maintenance ............................................................................................... 13
Warranty ...................................................................................................................... 15

6 Installation, Commissioning, User & Maintenance Instructions

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0312749_LST_330-660_UK_V2.1, 2022-06-27
1 Technical specifications
1.1 Floor load
1.2 Working clearance
1.3 Packaging
1.4 Disposal
Allow for the storage vessels weight and the maximum floor load; refer to the table (1.5
"General specifications").
For access to the storage vessel, it is recommended that the following clearances are
observed:
•around the anode connection: 100 cm.
•around the vessel: 50 cm.
•top of the vessel: 50 cm
Note
When installing the storage vessel, be aware that any leakage from the tank and/or
connections can cause damage to the immediate environment or floors below the level
of the boiler room. If this is the case, the storage vessel should be installed above a
waste water drain or in a suitable metal leak tray.
The leak tray must have an appropriate waste water drain and must be at least 5 cm
deep with a length and width at least 5 cm greater than the diameter of the storage
vessel.
The packaging prevents damage to the appliance during transport. The
packaging material chosen is environmentally friendly, recyclable and
relatively easy to dispose of in an environmentally aware way.
Old end-of-life appliances contain materials that need to be recycled. When disposing of
old devices that have reached the end of their service life, you should
take account of local legislation relating to waste disposal.
You must therefore never dispose of your old appliance together with
regular waste, but should and it into a municipal waste collection depot for
electrical and electronic equipment. Ask your dealer/installation engineer
for advice if necessary. The old appliance must be stored out of reach of
children.
1.5 General
specifications
Description Unit LST 330 LST 440 LST 550 LST 660
Storage Capacity liters 1550 1880 2500 2820
Empty Weight kg 325 350 485 520
Max. Floor Load kg 1875 2230 2985 3340
Energy Efficiency Class (Energy Label) - - - - -
Heat Loss W 154 171 232 243
Max. Working Pressure Tank KPa (bar) 700 (7) 700 (7) 700 (7) 700 (7)
Max. Water Temperature Tank ºC 95 95 95 95
Max. Operating Pressure (Vented) kPa (bar) 700 (7) 700 (7) 700 (7) 700 (7)
Max. Operating Pressure (Unvented) kPa (bar) 550 (5.5) 550 (5.5) 550 (5.5) 550 (5.5)
Anodes - 3 3 3 3

8 Installation, Commissioning, User & Maintenance Instructions
1.6 Dimensions
Unit LST 330 LST 440 LST 550 LST 660
A Total height mm 1985 2175 2045 2070
D Diameter (without insulation) mm 1100 1100 1400 1400
Diameter (with insulation) mm 1300 1300 1600 1600
F Height connection mm 1190 1340 1220 1270
M Height cold water inlet mm 135 135 185 185
N Height warm water outlet mm 1985 2175 2045 2170
P Height inspection opening mm 450 450 530 530
R Height circulation mm 710 745 790 790
S Height immersion well/temp. sensor mm 950 1045 980 1045
T Height T&P connection mm 1515 1705 1495 1625
W Height connection mm 385 385 465 465
X Height connection mm 485 485 565 565
Y Height connection mm 585 585 665 665
1 Connection cold water inlet - R 2" R 2" R 2" R 2"
2 Connection warm water outlet - R 2" R 2" R 2" R 2"
5 Connection circulation - Rp 1¼" Rp 1¼" Rp 1¼" Rp 1¼"
6 Diameter inspection opening mm 110 110 110 110
7 Connection T&P - Rp 2" Rp 2" Rp 2" Rp 2"
8 Connection immersion well/temp. sensor - Rp ¾" Rp ¾" Rp ¾" Rp ¾"
10 Connection anode - Rp ¾" Rp ¾" Rp ¾" Rp ¾"
12 Connection - Rp 2" Rp 2" Rp 2" Rp 2"
13 Connection - Rp 2" Rp 2" Rp 2" Rp 2"
14 Connection - Rp ¼" Rp ¼" Rp ¼" Rp ¼"
15 Connection - Rp ¾" Rp ¾" Rp ¾" Rp ¾"
Dimensioned Sketch
IMD-1301 R0

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0312749_LST_330-660_UK_V2.1, 2022-06-27
2 Installation
Important
Three anodes are delivered with the storage vessel. 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.
Note
These products can be installed as vented and unvented. This manual only discusses
unvented installations. For information about vented installations please contact your
supplier.
2.1 Installation diagram These figures blow shows the installation diagrams. These diagrams are referred to in
The sections describing the actual connection procedure.
Installation Diagram
Legend
1. pressure relief valve
(mandatory if mains water
pressure is too high)
3. T&P-valve (mandatory)
4. stop valve (recommended)
5. non-return valve (mandatory)
6. circulation pump (optional)
9. drain valve
11. service stop valve
12. temperature gauge (optional)
14. draw-off points
15. expansion valve (mandatory)
16. expansion vessel (mandatory)
A. cold water supply
B. hot water supply
C. circulation pipe
IMD-0645 R0
2.2 Water connections Warning
The installation should be carried out by a competent person, in compliance with general
and locally applicable regulations.

10 Installation, Commissioning, User & Maintenance Instructions
2.2.1
2.2.2
2.2.3
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
regulations.
2. The maximum working pressure of the storage vessel 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.
1. Optional: fit a temperature gauge (12) so you can check the temperature of the tap
water.
2. Fit the T&P valve (3).
3. 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
circulation system.
2. Fit a non-return valve (5) after the circulation pump to guarantee the direction of
circulation.
3. Fit two stop valves for servicing (4).
4. Connect the circulation pipe according to the installation diagram (2.1 "Installation
diagram").

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0312749_LST_330-660_UK_V2.1, 2022-06-27
3 Filling and draining
Important
Three anodes are delivered with the storage vessel. 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.
Note
These products can be installed as vented and unvented. This manual only discusses
unvented installations. For information about vented installations please contact your
supplier.
Installation Diagram
Legend
1. pressure relief valve
(mandatory if mains water
pressure is too high)
3. T&P-valve
4. stop valve (recommended)
5. non-return valve (mandatory)
6. circulation pump (optional)
9. drain valve
11. service stop valve
12. temperature gauge (optional)
14. draw-off points
15. expansion valve (mandatory)
16. expansion vessel (mandatory)
A. cold water supply
B. hot water supply
C. circulation pipe
F. inlet heat exchanger
G. outlet heat exchanger
IMD-0645 R0
3.1 Filling To fill the water heater, proceed as follows:
1. Open the stop valve (11) in the hot water pipe and, if present, the 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) so that cold water flows into the
water heater.
5. Completely fill the water heater. When a full water jet flows from the nearest draw-off
point, the water heater is full.

12 Installation, Commissioning, User & Maintenance Instructions
3.2 Draining
6. Bleed the entire installation of air, for example by opening all draw-off points.
7. The water heater is now under water supply pressure. There should now be no water
coming out of the inlet combination expansion valve or (if used) out of the T&P valve
(3). If there is, the cause might be:
- The water supply pressure is greater than the specified value (1.6 "General
specifications"). Rectify this by fitting a pressure reducing valve (1).
- The expansion valve in the protected cold supply set-up is defective or incorrectly
fitted.
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) so that it drains completely.

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0312749_LST_330-660_UK_V2.1, 2022-06-27
4 Maintenance
4.1 Preparation for
maintenance
4.2 Water-side
maintenance
4.2.1
Warning
Maintenance may only be carried out by a competent person.
At each service, the storage vessel 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
vessel model and the full serial number of the storage vessel. 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 vessel.
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 vessel, 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 vessel is equipped with a
cleaning opening.
Work order:
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 water heater 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.

14 Installation, Commissioning, User & Maintenance Instructions
4.2.2 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. Mount the (new) anodes.

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0312749_LST_330-660_UK_V2.1, 2022-06-27
5 Warranty
Contact Lochinvar Ltd. or got to www.lochinvar.ltd.uk for the current warranty terms and
conditions.

8 Lombard Way, The MXL Centre, Banbury, Oxon, OX16 4TJ
Tel: [phone], Fax:[phone], Email: [e-mail]
www.lochinvar.ltd.uk
Lochinvar Ltd reserves the right to change
specifications without prior notice