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A.O. Smith
Water Heater
BTX 100
A.O. Smith BTX 100 Service Handbook
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9
T
OP VIEW
BLOWER
PROVER
SWITCH
CCB ENCLOSURE
(central control board)
3/4 INCH NPT
W
A
TER OUTLET
WITH OUTLET
ANODE ROD
3/4 INCH NPT
W
A
TER INLET
BLOCKED
EXHAUST
SWITCH
TEMPERA
TURE
PRESSURE
RELIEF V
AL
VE
BURNER
SIGHT GLASS
FRONT
1/2 INCH
SUPPL
Y GAS
CONNECTION
BLOCKED
INT
AKE
AIR
SWITCH
COMBUSTION
BLOWER
2 INCH PVC
INT
AKE
AIR
CONNECTION
2 INCH PVC
VENT CONNECTION
JUNCTION
BOX - 120 V
AC
POWER SUPPL
Y
CONNECTIONS
SECOND
ANODE ROD
COMBUSTION BLOWER & BURNER
ASSEMBL
Y
COMBUSTION
BLOWER
EXPLODED VIEW
GASKET
(SILICONE)
BLOWER
DISCHARGE
ORIFICE
GASKET
(FIBER)
BURNER SIGHT
GLASS
AND
WIRING HARNESS
COVER PLA
TE
GASKET (SILICONE)
GASKET
GASKET (FIBER)
GASKET (FIBER)
BURNER SIGHT GLASS
BURNER
ADAPTER
BURNER
ADAPTER
WIRING HARNESS.
IGNITER/FLAME
SENSOR
IGNITER
BURNER
BURNER FLANGE
(FLOA
TING FLANGE)
FLAME
SENSOR
GAS V
AL
VE
VENTURI
ASSEMBL
Y
INT
AKE
AIR
ELBOW
ASSEMBLED VIEW
10
12
Table of Contents
Table of CONTENTS
3
Qualifications
4
Service Warning
4
Service Reminder
4
Tools Required
4
Introduction
4
Instruction Manual
5
Closed Water Systems
5
Thermal Expansion
5
Air Requirements
5
Contaminated Air
5
Installation CONSIDERATIONS
5
Venting
6
General Venting Information
6
Maximum Equivalent Length Requirements
6
Intake Air Connection
7
Power Supply Test
8
Grounding and Polarity
8
Electrical Requirements
8
Installation Check List
9
Features and Components
10
Front & Back Views
10
Top View
11
Combustion Blower & Burner Assembly
11
How It Works
12
OPERATION and Service
12
Combustion Blower
13
Burner Assembly
14
Combustion Blower and Burner Removal
16
Flame Sensor
20
Flame Sensing Operation
20
Flame Sensing Current Test
21
Igniter
22
Igniter Current Test
22
Venturi
24
Gas Valve
25
Gas Valve Voltage Tests
25
Gas Valve Removal
26
Gas Pressure
27
Gas Pressure Test
28
Gas Flow Test
29
Pressure Switches
30
Construction & Operation
30
Control System Monitoring
31
Pressure Switch Tests
33
Continuity Test During Standby
33
Continuity Test During Operation
34
Pressure Test During Operation
34
Blocked Exhaust Switch
36
Temperature Probe
37
Temperature Sensor Test
37
Eco Continuity Test
38
Control System Hardware
39
Uim (User Interface Module)
39
CCB (Central Control Board)
41
CCB Cover Removal and Replacement
42
CCB Circuit Board Layout
43
CCB Connection Identification
44
Wiring Diagram
46
Control System Operation
47
Control System Features
47
Overview
47
Desktop Screen
48
User Input Buttons
48
Control System Navigation
48
Commercial and Residential Models
48
Status Icons
49
Operating States
50
Control System Menus
50
Temperatures
51
Heater Status
52
Display Settings
53
Heater Information
53
Restore Factory Defaults
54
Fault History
54
Fault Occurrence
54
Current Fault
54
Service Contact Information
55
Sequence of Operation
56
Sequence of Operation Flow Chart
57
Resetting the Control System
58
Things to Check before Servicing
58
Heater Status Menu
58
Not Enough Hot Water
58
Rough Starting/Rough Operation
58
Troubleshooting
58
Control System Unresponsive
59
Uim (Lcd) Is Blank
59
Uim Is Inoperable
59
Fault Messages
60
Temp Probe Open
60
Temp Probe Short
60
AC Reversed
60
Flame Sensor Short
61
Flame Detect Error
61
Energy Cut out (Eco)
62
Blocked Air Intake
63
Blocked Exhaust
64
Blower Prover Failure
64
Blower Prover Open
65
Low Igniter Current
66
Ignition Failure
67
Communication Failure
68
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Instruction Manual
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A.O. Smith BTX 100 Specifications
General
Brand
A.O. Smith
Model
BTX 100
Category
Water Heater
Language
English
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