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A.O. Smith
Water Heater
101 Series
A.O. Smith 101 Series Service Handbook
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1
Service Handbook
PRINTED IN THE U
.
S
.A
1008
198335-000
SERVICING SHOULD ONL
Y
BE PERFORMED BY
A QUALIFIED SER
VICE
AGENT
.
COMMERCIAL
ELECTRIC W
A
TER HEA
TERS
MODEL
S D
SE-
5 THRU DSE-120
SERIES 1
00 and 102
INST
ALLA
TION CONSIDERA
TIONS - PRE SERVICE
CHECKS - W
A
TER HEA
TER CONSTRUCTION -
OPERA
TION & SERVICE - TROUBLESHOOTING
500 T
ennessee Waltz Parkway
Ashland City
, TN 37015
http://waterheatertimer.org/3-phase-water-heater.html
2
Table of Contents
Table of Contents
3
Introduction
4
Qualifications
4
Service Warning
4
Tools Required
5
Installation Considerations
6
Closed Water Systems
6
Thermal Expansion
6
Electrical Requirements
7
Pre Service Checks
8
Service Precautions
8
Water Heater Construction
9
5 - 20 Gallon Models
10
Gallon Models
11
Operation & Service
12
Principles of Electricity
12
Single and Three Phase Power
14
Checking Single Phase Power
15
Checking Three Phase Power
16
Fuses
17
Heating Elements
18
Heating Element Construction
18
Six and Three Wire Heating Elements
19
Single Phase Element Wiring
20
Three Phase Element Wiring
22
Heating Element Ratings & Configurations
25
Heating Element Amperage Tables
26
Heating Element Amperage Test
27
Heating Element Voltage Test
28
Heating Element Resistance Tables
30
Heating Element Resistance Test
31
Heating Element Ground Test
32
Replacing Heating Elements
33
Heating Element Sensors
34
Element Sensor Operation
35
Contactors
36
Contactor Configurations
37
Contactor Inspection
38
Contactor Coil Voltage - at Contactor
39
Contactor Coil Voltage - at CCB
40
Transformers
41
VAC Control Circuit Transformer Wiring
41
VAC Control Circuit Transformer Test
43
24 VAC Transformer Test
44
Immersion Temperature Probe
45
Temperature Sensor Resistance Test
46
Temperature Sensor DC Voltage Test
47
ECO Continuity Test
47
ECO Voltage Test
48
LWCO (Low Water Cut Off)
49
Powered Anode Rod
50
Electronic Controls
51
CCB - Central Control Board
52
CCB Socket & Wiring Terminal Identification
53
CCB Enable Disable Circuit(S) Test
55
Checking Power and Ground to the CCB
56
UIM - User Interface Module
57
Electronic Control System
58
Heating Element Operation
58
Control System Features
59
Control System Navigation
59
The Desktop Screen
60
Status Icons
61
Operating States
62
Control System Menus
62
Temperatures Menu
63
Temperature Settings
64
Heater Status Menu
65
Economy Mode Setup Menu
66
Setpoint Adjustment Value
67
Time Clock Settings
68
Daily Operating Mode Settings
69
Alarm Output Setup Menu
70
Display Settings Menu
71
Heater Information Menu
72
Current Fault/Alert Menu
73
Fault History Menu
73
Fault Occurrence Menu
73
Restore Factory Defaults Menu
74
Troubleshooting
75
Common Service Problems
75
Control System Diagnostics
76
Fault Conditions
76
Alert Conditions
76
Resetting the Control System
76
Control System Unresponsive
76
UIM Display Is Blank
76
UIM Is Inoperable
77
Heating Cycle Disabled
77
Fault & Alert Messages
78
No Current Detected
78
Temp Probe Open
79
Temp Probe Short
79
Energy Cut out (ECO)
80
LWCO Fault
81
No Anode Current
82
Other manuals for A.O. Smith 101 Series
Instruction Manual
120 pages
Installation And Operating Manual
56 pages
Installation & Service Manual
44 pages
User's Information Manual
44 pages
4
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A.O. Smith 101 Series Specifications
General
Brand
A.O. Smith
Model
101 Series
Category
Water Heater
Language
English
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