A.O. Smith ITE 400 Troubleshooting guide

0312 735
Innovation has a name.
Indirect calorifier
ITE - 400/500/600/750/1000
ITE
Installation, User and Service
Manual
3917 - Wijzigingen voorbehouden / Changes Reserved / Réserve de modifications.

A.O. Smith UK, Unit B8 Amstrong Mall, Southwood Business Park, Farnborough, Hampshire GU14 0NR
www.aosmith.co.uk
A.O. Smith France, 14, allée Charles Pathé, 18000 Bourges
www.aosmith.fr, 008008-AOSMITH (2676484)
A.O. Smith Hoofdkantoor Europa, De Run 5305, 5503 LW Veldhoven
www.aosmith.nl, 0800-AOSMITH (2676484)
Uw Installateur / Your Installer / votre installateur

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Read this manual
carefully
Trademarks
Liability
More information
Warning
Read this manual carefully before starting the water heater. Failure to read the
manual and to follow the printed instructions may lead to personal injury and damage
to the water heater.
Copyright © 2017 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 water
heater, 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: [email protected]
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.

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Table of contents
1 1.1
1.2
1.3
1.4
1.5
1.6
1.7
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
Water composition ................................................................................................... 7
Working clearance ................................................................................................... 7
Packaging ................................................................................................................ 7
Disposal ................................................................................................................... 7
General specifications .............................................................................................. 8
Dimensions .............................................................................................................. 8
Installation ............................................................................................................. 11
Installation diagram ................................................................................................ 11
Water connections .................................................................................................. 12
Filling and Draining ............................................................................................... 13
Filling ...................................................................................................................... 13
Draining .................................................................................................................. 14
Maintenance .......................................................................................................... 15
Preparation for maintenance ................................................................................... 15
Water-side maintenance ......................................................................................... 15
Warranty ................................................................................................................ 17
General warranty .................................................................................................... 17
Tank warranty ......................................................................................................... 17
Conditions for installation and use .......................................................................... 17
Exclusions ............................................................................................................... 18
Scope of warranty ................................................................................................... 18
Claims ..................................................................................................................... 18
Obligations of A.O. Smith ........................................................................................ 18

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1 Technical specifications
1.1 Floor load
1.2 Water composition
1.3 Working clearance
1.4 Packaging
1.5 Disposal
Allow for the water heater's weight and the maximum floor load; refer to the table
(1.6 "General specifications").
The water heater 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.
Water specifications
Water composition
Hardness
(alkaline earth ions)
> 1,00 mmol/l:
German hardness > 5,6 °dH
French hardness > 10,0 °fH
English hardness > 7,0 °eH
> 100 mg/l CaCO3
Conductivity
> 125 μS/cm
Acidity (pH value)
7,0 < pH value < 9,5
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 water heater, it is recommended that the following clearances are
observed:
around the anode connection: 100 cm.
around the water heater: 50 cm.
top of the water heater: 50 cm
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.

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1.6 General specifications General specifications
Unit
ITE 400
ITE 500
ITE 600
ITE 750
ITE 1000
Contents
litres
389
478
652
734
1024
Empty weight
kg
131
179
229
237
314
Max. floor load
kg
520
657
881
971
1338
Energy Efficiency Class (Energy Label)
-
C
C
-
-
-
Heat Loss
W
100
104
126
126
146
Max. operating pressure tank
kPa (bar)
1000 (10)
1000 (10)
1000 (10)
1000 (10)
1000 (10)
Max. operating pressure heat exchanger
kPa (bar)
1600 (16)
1600 (16)
1600 (16)
1600 (16)
1600 (16)
Max. water temperature tank
ºC
95
95
95
95
95
Max. water temperature heat exchanger
ºC
110
110
110
110
110
Anodes
-
1
1
1
1
1
Capacity heat exchanger
kW
52
68
72
80
87
Primary flow 80/60ºC
l/h
2236
2924
3096
3440
3741
Pressure loss
mbar
244
489
104
128
259
Heat exchange surface
m2
1.64
2.13
2.39
2.66
2.89
1.7 Dimensions Dimensions
Unit
ITE 400
ITE 500
ITE 600
ITE 750
ITE 1000
A
Total height
mm
1710
2045
1840
2035
2005
D
Diameter (without insulation)
mm
600
600
750
750
900
Diameter (with insulation)
mm
740
760
910
930
1080
G
Height heat exchanger outlet
mm
260
260
310
310
350
H
Height heat exchanger inlet
mm
775
915
910
970
945
M
Height cold water inlet
mm
70
70
85
85
95
N
Height warm water outlet
mm
1655
1995
1805
2000
1965
Pa
Height inspec. opening/elec. element
mm
330
330
420
420
450
Pb
Height inspec. opening/elec. element
mm
900
1030
1070
1120
1090
R
Height recirculation connection
mm
1100
1290
1240
1300
1400
S
Height immersion well/temp. sensor
mm
500
500
655
655
705
T
Height T&P connection
mm
1365
1700
1480
1675
1605
U
Height temp. sensor top tank
mm
1365
1700
1480
1675
1605
1
Connection cold water inlet
-
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"
3
Connection heat exchanger outlet
-
Rp 1"
Rp 1"
Rp 1¼"
Rp 1¼"
Rp 1¼"
4
Connection heat exchanger inlet
-
Rp 1"
Rp 1"
Rp 1¼"
Rp 1¼"
Rp 1¼"
5
Connection circulation
-
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
6
Diameter inspec. opening/elec. element
mm
115
115
180
180
180
7
Connection T&P
-
1"-11.5 NPT
1"-11.5 NPT
1"-11.5 NPT
1"-11.5 NPT
1"-11.5 NPT
8
Connection immersion well/temp. sensor
-
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
9
Connection temp. sensor top tank
-
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
Rp ¾"
10
Connection anode
-
Rp 1¼"
Rp 1¼"
Rp 1¼"
Rp 1¼"
Rp 1¼"

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Front sectional view of the appliance
IMD-1299 R0

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2 Installation
2.1 Installation diagram This figure shows the installation diagram. This diagram is referred to in the sections
describing the actual connection procedure.
Note
These products can be installed as vented and unvented. This manual only
discusses unvented installations. For information about vented installations please
contact A.O. Smith.
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
F. inlet heat exchanger
G. outlet heat exchanger
Installation Diagram
IMD-1169 R0
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 cold water side as required by the
applicable regulations.
2. The maximum working pressure of the water heater 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).
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.

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2.2.2
2.2.3
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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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 A.O. Smith.
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
Installation Diagram
IMD-1169 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.
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.

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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.

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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 water heater 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, water
heater model and the full serial number of the water heater. 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
2. Check the drainage pipes from the discharge points of all valves and remove any
scale deposits that may be present.
3. Drain the water heater.
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 water heater, 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 water heater is equipped with a
cleaning opening.

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4.2.2
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.
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 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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5 Warranty
5.1 General warranty
5.2 Tank warranty
5.3 Conditions for
installation and use
If within one year of the original installation date of a water heater 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 water heater 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 water heater with an entirely
new water heater of equivalent size and quality The warranty period given on the
replacement water heater shall be equal to the remaining warranty period of the
original water heater 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 water heater, 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 water heater 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 water heater remains installed at the original site of installation.
c. The water heater 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 water heater rating plate.
g. The water heater is installed in a non-corrosive atmosphere or environment.
h. The water heater 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 water
heater; 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 water heater, and further in compliance with the
government and local authority installation and building codes, rules and
regulations.
i. The water heater 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.

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5.4 Exclusions
5.5 Scope of the
warranty
5.6 Claims
5.7 Obligations of
A.O. Smith
The warranty set out in articles 1 and 2 will not apply in the event of:
a. damage to the water heater caused by an external factor;
b. misuse, neglect (including frost damage), modification, incorrect and/or
unauthorised use of the water heater 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/lit
e. unfiltered, recirculated water flowing through or being stored in the water heater;
f. any attempts at repair to a defective water heater other than by an approved
service engineer.
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 water heater,
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 water heater was purchased, or to another authorised dealer for
A.O. Smith Water Products Company products. Inspection of the water heater 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 water heaters nor the
(assemblies or parts of) water heaters 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) water heater that it has supplied.