Lochinvar LST Series Guide

Installation, Commissioning,
User & Maintenance Instructions
LV 312748 | March 2019
0312748 R3.0 / 1019 - Changes Reserved
LST
Direct Storage Vessel
Models:
LST 66 G E
LST 100 G E
LST 110 G E
LST 130 G E
LST 165 G E
LST 220 G E

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

Installation, Commissioning, User & Maintenance Instructions
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 © 2018
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.

Installation, Commissioning, User & Maintenance Instructions
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Installation, Commissioning, User & Maintenance Instructions
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 5.1
5.2
5.3
5.4
5.5
5.6
5.7
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
General warranty .......................................................................................................... 15
Tank warranty ............................................................................................................... 15
Conditions for installation and use ................................................................................ 15
Exclusions .................................................................................................................... 16
Scope of warranty ......................................................................................................... 16
Claims .......................................................................................................................... 16
Obligations of Lochinvar Ltd ......................................................................................... 16

Installation, Commissioning, User & Maintenance Instructions
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Installation, Commissioning, User & Maintenance Instructions
7
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 66
LST 100
LST 110
LST 130
LST 165
LST 220
Storage Capacity
litres
312
405
499
678
763
1055
Empty Weight
kg
81
99
131
179
201
262
Max. Floor Load
kg
393
504
630
857
964
1317
Energy Efficiency Class (Energy Label)
-
C
C
C
-
-
-
Heat Loss
W
100
100
104
126
126
146
Max. Working Pressure Tank
kPa (bar)
1000 (10)
1000 (10)
1000 (10)
1000 (10)
1000 (10)
1000 (10)
Max. Water Temperature
ºC
95
95
95
95
95
95
Max. Operating Pressure (Vented)
kPa (bar)
800 (8)
800 (8)
800 (8)
800 (8)
800 (8)
800 (8)
Max. Operating Pressure (Unvented)
kPa (bar)
550 (5.5)
550 (5.5)
550 (5.5)
550 (5.5)
550 (5.5)
550 (5.5)
Anodes
-
1
1
1
1
1
1

Installation, Commissioning, User & Maintenance Instructions
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1.6 Dimensions
Unit
LST 66
LST 100
LST 110
LST 130
LST 165
LST 220
A
Total height
mm
1375
1710
2045
1840
2035
2005
D
Diameter (without insulation)
mm
600
600
600
750
750
900
Diameter (with insulation)
mm
740
740
760
910
930
1100
M
Height cold water inlet
mm
70
70
70
85
85
95
N
Height warm water outlet
mm
1320
1655
1995
1805
2000
1965
P
Height inspection opening
mm
410
410
410
500
500
535
R
Height circulation
mm
660
825
995
1045
1085
1105
S
Height immersion well/temp.
sensor
mm
510
510
510
655
655
705
T
Height T&P
mm
1030
1360
1700
1470
1655
1595
V
Height connection
mm
845
1095
1350
1260
1380
1355
W
Height connection
mm
270
270
270
270
315
315
X
Height connection
mm
350
355
355
355
405
405
Y
Height connection
mm
425
425
425
425
485
485
1
Connection cold water inlet
-
R 1½"
R 1½"
R 1½"
R 1½"
R 1½"
R 1½"
2
Connection warm water outlet
-
R 1½"
R 1½"
R 1½"
R 1½"
R 1½"
R 1½"
5
Connection circulation
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
6
Diameter inspection opening
mm
115
115
115
180
180
180
7
Connection T&P
-
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
8
Connection
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
10
Connection anode
-
Rp 1¼"
Rp 1¼"
Rp 1¼"
Rp 1¼"
Rp 1¼"
Rp 1¼"
12
Connection
-
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
13
Connection
-
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
Rp 1½"
14
Connection
-
Rp ¼"
Rp ¼"
Rp ¼"
Rp ¼"
Rp ¼"
Rp ¼"
Dimensioned Sketch
IMD-1294 R0.0

Installation, Commissioning, User & Maintenance Instructions
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2 Installation
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 The figures below show the installation diagrams. These diagrams are referred to in the
sections describing the actual connection procedure.
Installation Diagrams
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-0550 R1.0
2.2 Water connections
2.2.1
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 water supply side as required by the applicable
regulations.
2. The maximum working pressure of the storage vessel is 10 bar. Because the
pressure in the water pipe at times can exceed 10 bar, you must fit an approved
pressure-reducing valve (1).

Installation, Commissioning, User & Maintenance Instructions
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2.2.2
2.2.3
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").

Installation, Commissioning, User & Maintenance Instructions
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3 Filling and draining
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
IMD-0550 R1.0
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.
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.

Installation, Commissioning, User & Maintenance Instructions
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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) so that it drains completely.

Installation, Commissioning, User & Maintenance Instructions
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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 out 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 put 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
anode.
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 storage vessel 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.

Installation, Commissioning, User & Maintenance Instructions
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4.2.2 Checking anode
Anode 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 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) anode.

Installation, Commissioning, User & Maintenance Instructions
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5 Warranty
5.1 General warranty
5.2 Tank warranty
5.3 Conditions for
installation and use
If within 1 (one) year of the invoice date or commissioning date of a storage vessel
supplied by Lochinvar Ltd, following verification, and at the sole discretion of Lochinvar
Ltd, 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 Lochinvar Ltd shall
repair or replace this assembly or part.
If within 3 (three) years of the invoice date or commissioning date of a storage vessel
supplied by Lochinvar Ltd, following verification, and at the sole discretion of Lochinvar
Ltd, the enamel-lined steel tank proves to be leaking due to rust or corrosion occurring
on the water side, then Lochinvar Ltd shall offer to replace the defective storage vessel
with an entirely new storage vessel of equivalent size and quality The warranty period
given on the replacement storage vessel shall be equal to the remaining warranty period
of the original storage vessel that was supplied.
The warranty set out in articles 1 and 2 will apply solely under the following conditions:
a. The storage vessel is installed under strict adherence to Lochinvar Ltd installation
instructions for the specific model, and must be in accordance with the relevant
requirements of the Gas Safety Regulations, Building Regulations, I.E.E. Regulations
and the byelaws of the local water undertaking. The installation should also be in
accordance with any relevant requirements of the local gas distributor and local
authority.
b. The storage vessel remains installed at the original site of installation.
c. The storage vessel 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 storage vessel do not exceed the maximum setting of
the thermostats, which form a part of the storage vessel.
f. The water pressure and/or heat load do not exceed the maximum values stated on
the storage vessel rating plate.
g. The storage vessel is installed in a non-corrosive atmosphere or environment.
h. The storage vessel 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 storage vessel; and
where applicable by a likewise approved temperature and pressure relief valve, fitted
in accordance with installation instructions of Lochinvar Ltd applying to the specific
model of storage vessel, and further in compliance with Building Regulations, local
authority installation byelaws and the Water Supply (Water Fittings) Regulations
1999 .
i. The storage vessel is at all times fitted with cathodic protection. If sacrificial anodes
are used for this and these anodes have reduced in size by more than 40% at any
point along their length or if they are severely pitted, new anodes should be fitted.
Particular attention should be paid to the ends of each anode to ensure excessive
localized depletion has not occurred. Where anodes are covered with particles they
should be cleaned; for reference, when new, the anode has a diameter of 21 mm.
When power anodes are used, it is important to ensure that they continue to work
properly.

Installation, Commissioning, User & Maintenance Instructions
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5.4 Exclusions
5.5 Scope of the
warranty
5.6 Claims
5.7 Obligations of
Lochinvar Ltd
The warranty set out in articles 1 and 2 will not apply in the event of:
a. damage to the storage vessel caused by an external factor;
b. misuse, neglect (including frost damage), modification and incorrect and/or
unauthorized use of the storage vessel;
c. contaminants or other substances having been allowed to enter the tank;
d. any attempts at repair to a defective storage vessel other than by an approved
service engineer.
The obligations of Lochinvar Ltd pursuant to the specified warranty are limited to free
delivery from the warehouse of the replacement assemblies, parts or storage vessel,
respectively. Labor, installation and any other costs associated with the replacement will
not be accepted by Lochinvar Ltd.
A claim on grounds of the specified warranty must be submitted to the dealer from whom
the storage vessel was purchased, or to another authorized dealer of Lochinvar Ltd.
Inspection of the storage vessel as referred to in articles 1 and 2 shall take place in one
of the laboratories of Lochinvar Ltd.
Lochinvar Ltd grants no other warranty or guarantee over its storage vessels nor the
(assemblies or parts of) storage vessels supplied for replacement, other than the
warranty expressly set out in these conditions.
Under the terms of the supplied warranty, Lochinvar Ltd is not liable for damage to
persons or property caused by (assemblies or parts, or the glass-lined steel tank of) a
(replacement) storage vessel that it has supplied.
0312748_LST_66-220_EN_V3.0, 2019-03-08

7 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