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A.O. Smith
Water Heater
BTH 120 Series
A.O. Smith BTH 120 Series User Manual
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MODEL
S COVERED: BTH 120 THRU 500
SERIES 1
00, 101
AND
BTH 400/500 SERIES 1
04
500 T
ennessee W
altz Parkway
Ashland City
, TN 37015
PRINTED IN THE U
.
S
.A.
1012
316586-002
SERVICING SHOULD ONL
Y BE PERFORMED BY
A QUALIFIED SER
VICE TECHNICIAN
Service Handbook
COMMERCIAL
GAS HIGH EFFICIENCY W
A
TER HEA
TERS
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
2
Table of Contents
Table of Contents
3
Introduction
4
Qualifications
4
Tools Required
5
General Information
6
Gas Pressure Specifications
6
Installation Quick Tips - Bth 120 and 150: Gas Pressure
8
Installation Quick Tips - Bth 199 and 250 Gas Pressure
9
Installation Quick Tips - Bth 300, 400, 500 Gas Pressure
10
Installation Quick Tips - Bth 300, 400, 500
11
Installation - Venting Category and Materials
12
Venting Tables - Bth 120 - 250
13
Venting Tables - Bth 300, 400, 500
13
Concentric Venting
14
Vent Condensation
15
Venting - All Models - Single Pipe Direct Vent - Using Outside Air Termination Clearances Sidewall Power Vent
16
Venting - All Models - Two Pipe Direct Vent - Using Outside Air Termination Clearances Sidewall Direct Vent
17
Vent Termination - Direct Vent - All Models
18
Direct Venting - All Models
19
Control Overview
20
Adjusting Tank Temperature - Operating Set Point - Differential
22
Changing the Display Units
24
Fault and Warning Conditions - Advanced Diagnostic Information
26
Access to the Current Fault or Warning
27
Fault Codes
28
Viewing the Fault History - Viewing Information about the Heater
29
Control Sequence (Typical All Models)
30
Control Sequence Flow Chart
31
Controls - Central Control Board - Ccb
32
Controls - Gas Control Valve Bth 120
34
Controls - Gas Control Valve Bth 150
34
Controls - Gas Control Valve Bth 199 and 250
35
Controls - Gas Control Valve, Orifice Chart - Bth 300/400 - 100/101
36
Controls - Gas Control Valve, Orifice Chart - Bth 400/500
37
Controls - Pressure Switches - All Models
38
Controls - Pressure Switches - Bth 120 through 250
39
Controls - Pressure Switches - Bth 300, 400, 500
40
Controls - Connections, Igniter, Flame Sensor, Sight Glass, Powered Anodes
41
Hot Surface Igniter / Flame Sensor / Control Timing
42
Blower Speed Control Bth 199 and 250
43
Variable Frequency Drive - Bth 400 and 500
44
Variable Frequency Drive - Blower Speed and Pressure Readings
45
Wiring Diagram - Bth 120 - 300
46
Wiring Diagram - Bth 400, 500
47
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A.O. Smith BTH 120 Series Specifications
General
Brand
A.O. Smith
Model
BTH 120 Series
Category
Water Heater
Language
English
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