A.O. Smith STE - 400 Troubleshooting guide

0311 370 / 03-2014 Innovation has a name.
Commercial Electric Storage
Water Heater
STE - 400/500/600/750/1000
STE
Installation, User and Service
Manual
Changes Reserved

A.O. Smith Europa, De Run 5305, 5503 LW Veldhoven, The Netherlands
[phone]
your installer

Installation, User and Service Manual
3
Read this manual
carefully
Trademarks
Liability
More information
Warning
Read this manual carefully before starting the electric storage water heater. Failure to read
the manual and to follow the printed instructions may lead to personal injury and damage to
the electric storage water heater.
Copyright © 2014 A.O. Smith Water Products Company B.V.
All rights reserved.
Nothing from this publication may be copied, reproduced and/or published by means of
printing, photocopying or by whatsever 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 B.V.:
PO Box 70
5500 AB Veldhoven
The Netherlands
Telephone: 008008 - AOSMITH
008008 - 267 64 84
General: [phone]
Fax: [phone]
E-mail: [email protected]
Website: -
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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5
Table of contents
1
1.1
1.2
1.3
1.4
1.5
1.6
2
2.1
2.2
2.3
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
General specifications .......................................................................................................... 7
Electrical specifications ........................................................................................................ 8
Dimensions .......................................................................................................................... 8
Installation ............................................................................................................ 11
Installation diagram ............................................................................................................ 11
Water connections ............................................................................................................. 11
Electrical connections ........................................................................................................ 12
Maintenance ......................................................................................................... 15
Preparation for maintenance .............................................................................................. 15
Water-side maintenance .................................................................................................... 15
Errors .................................................................................................................... 17
Introduction ........................................................................................................................ 17
Troubleshooting table ......................................................................................................... 18
Warranty ............................................................................................................... 21
General warranty ................................................................................................................ 21
Tank warranty .................................................................................................................... 21
Conditions for installation and use ..................................................................................... 21
Exclusions .......................................................................................................................... 22
Scope of warranty .............................................................................................................. 22
Claims ................................................................................................................................ 22
Obligations of A.O. Smith ................................................................................................... 22

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1 Technical specifications
1.1 Floor load
1.2 Water composition
1.3 Working clearance
Take the storage water heaters weight in account for the maximum floor load; refer to the
table (1.4 "General specifications").
The storage water 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
> 100 ppm 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 storage water heaters, it is recommended that the following clearances
are observed:
around the anode connection/top of the water heater: 100 cm.
around the water heater: 50 cm.
1.4 General
specifications
General Specifications - water heater
Unit
STE 400
STE 500
STE 600
STE 750
STE 1000
Contents
litres
405
499
678
763
1055
Empty weight
kg
99
131
179
201
262
Maximum floor load
kg
504
630
957
964
1317
Maximum operating pressure
kPa (bar)
1000 (10)
1000 (10)
1000 (10)
1000 (10)
1000 (10)
Maximum water temperature
ºC
95
95
95
95
95
Anodes
-
1
1
1
1
1

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1.5 General
specifications
Electrical Specifications - flange element
Unit
2.0 kW
2.5 kW
3.3 kW
6.0 kW
7.5 KW
Supply voltage (-15%, +10% VAC)
Volt
230
230
230
400
400
Number of phases
-
1
1
1
3
3
Current (max. amount per phases)
A
8.7
10.9
14.4
5
6.3
Mains frequency (±1 Hz)
Hz
50
50
50
50
50
IP class
-
IP-5X
IP-5X
IP-5X
IP-5X
IP-5X
Maximum operating pressure
kPa (bar)
600 (6)
600 (6)
600 (6)
600 (6)
600 (6)
Max. Setpoint Control Thermostat
°C
85
85
85
85
85
Overheat Thermostat
°C
95
95
95
95
95
Electrical Specifications - screw-in element
Unit
2.0 kW
2.5 kW
3.0 kW
4.5 kW
6.0 kW
7.5 KW
Supply voltage (-15%, +10% VAC)
Volt
230
230
400
400
400
400
Number of phases
-
1
1
3
3
3
3
Current (max. amount per phases)
A
8.7
10.9
2.5
3.8
5
6.3
Mains frequency (±1 Hz)
Hz
50
50
50
50
50
50
IP class
-
IP-5X
IP-5X
IP-5X
IP-5X
IP-5X
IP-5X
Maximum operating pressure
kPa (bar)
600 (6)
600 (6)
600 (6)
600 (6)
600 (6)
600 (6)
Max. Setpoint Control Thermostat
°C
85
85
85
85
85
85
Overheat Thermostat
°C
95
95
95
95
95
95
1.6 Dimensions
Unit
STE 400
STE 500
STE 600
STE 750
STE 1000
A
Total height
mm
1705
2040
1835
2030
2000
D
Diameter tank (with insulation)
mm
720
720
910
910
1060
Diameter tank (without insulation)
mm
606
606
796
796
946
M
Height cold water inlet
mm
70
70
85
85
95
N
Height warm water outlet
mm
1650
1990
1797
1992
1962
O
Diameter inspection opening
mm
115
115
180
180
180
P
Height inspection opening
mm
410
410
493
493
530
R
Height connection
mm
270
270
315
315
360
S
Height temp. sensor connection
mm
348
348
400
400
445
T
Height connection
mm
425
425
485
485
530
U
Height recirculation connection
mm
510
510
650
650
700
V
Height connection
mm
826
995
1040
1080
1100
W
Height connection
mm
1094
1348
1255
1374
1351
X
Height T&P connection
mm
1362
1700
1466
1662
1592
1
Cold water inlet
-
R 2
R 2
R 2½
R 2½
R 2½
2
Warm water outlet
-
R 2
R 2
R 2½
R 2½
R 2½

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Unit
STE 400
STE 500
STE 600
STE 750
STE 1000
7
Connection
-
Rp ¾
Rp ¾
Rp ¾
Rp ¾
Rp ¾
8
Anode connection
-
Rp 1¼
Rp 1¼
Rp 1¼
Rp 1¼
Rp 1¼
11
Connection
-
Rp 2
Rp 2
Rp 2
Rp 2
Rp 2
12
Connection
-
Rp 2
Rp 2
Rp 2
Rp 2
Rp 2
13
Connection temp. sensor
-
Rp ¼
Rp ¼
Rp ¼
Rp ¼
Rp ¼
14
T&P connection
-
Rp 2
Rp 2
Rp 2
Rp 2
Rp 2
IMD-0526 R0.0
D
M
R
S
V
W
X
N
A
T
U
P
1
12
13
11
7
7
7
14
O
8
2

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