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A.O. Smith
Water Heater
BTH-120
A.O. Smith BTH-120 Service Handbook
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COMMERCIAL
GAS HIGH EFFICIENCY
W
A
TER HEA
TERS
Service Handbook
PRINTED IN THE U
.
S
.A.
0914
329297-000
500 T
ennessee W
altz Parkway
Ashland City
, TN 37015
FOR MODEL
S:
BTH 120 THRU 500
SERIES 200/201
INST
ALLA
TION CONSIDERA
TIONS - PRE SERVICE CHECKS -
CONSTRUCTION - OPERA
TION & SER
VICE - TROUBLESHOOTING
SERVICING SHOULD ONL
Y BE PERFORMED BY
A
QUALIFIED SERVICE TECHNICIAN
2
Table of Contents
Default Chapter
2
Table of Contents
2
Introduction
3
Qualifications
3
Service Warning
3
Service Reminder
3
Tools Recommended
3
Installation Considerations
4
Instruction Manual
4
Closed Water Systems
4
Thermal Expansion
4
Air Requirements
4
Contaminated Air
4
Features and Components
5
Combustion Blower & Burner Assembly
5
Top View: BTH 120 - 250 Models
6
Top View: BTH 300 - 500 Models
6
Sequence of Operation Flow Chart
7
1 Low Gas Pressure
8
Fault and Warning Codes
8
Gas Pressure Specifications
8
High Altitude
8
Gas Supply Systems
9
Supply Gas Regulator
9
Gas Pressure Test
10
2 Blower Operation Error
12
Pressure Switches
12
Control System Monitoring
12
Pressure Switch Tests
13
Continuity Test During Standby
13
Continuity Test During Operation
14
Pressure Test During Operation
14
Pressure Switch Settings
15
3 Blower Prover Open
17
4 Ignition Failure
18
5 Blocked Air Intake
21
6 Blocked Exhaust
22
7 Flame Sensor Error
23
Gas Control Valve
23
Gas Control Valve Voltage Tests
24
Flame Sensor
25
Flame Sensing Operation
25
Flame Sensing Current Test
26
8 No Water
27
Powered Anodes
27
Power Anode Cleaning and Removal
27
9 Anode Shorted
29
10 Temperature Probe Short (Upper or Lower)
30
Temperature Probe
30
Temperature Sensor Test
31
ECO Continuity Test
31
11 Temperature Probe Open (Upper or Lower)
33
Venting
34
General Venting Information
34
Intake Air Connection
35
Electrical Connections - All Models
36
Electrical Wiring
36
Power Supply Connections
36
Enable/ Disable Switch
37
Power Supply Test
37
Installation Check List
38
Operation and Service
39
How It Works
39
Combustion Blower
39
Modulation
39
Blower Speed Control - Bth 300 Thru 500
41
Variable Frequency Drive - Bth 300 Thru 500
42
Burner Assembly
43
Combustion Blower and Burner Removal/ Installation Instructions
44
Spark Igniter
45
Gas Orifice - Bth 300 Thru 500 Models
47
Orifice Chart - BTH 300 Thru 500 Models
47
Ccb (Central Control Board)
48
CCB Cover Removal and Replacement
49
CCB Circuit Board Layout
50
CCB Connection Identification
51
Wiring Diagram - Bth 120 Thru 250
53
Wiring Diagram - Bth 300 Thru 500
54
Control Overview
55
Other manuals for A.O. Smith BTH-120
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Service And Parts Manual
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A.O. Smith BTH-120 Specifications
General
Brand
A.O. Smith
Model
BTH-120
Category
Water Heater
Language
English
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