A.O. Smith BTH 120 Series User Manual

1
Servicing should only be performed by a Qualied Service Technician
TABLE OF CONTENTS
INTRODUCTION ......................................................................2
QUALIFICATIONS
.....................................................................2
TOOLS REQUIRED
....................................................................3
GENERAL INFORMATION
...............................................................4
GAS PRESSURE SPECIFICATIONS
......................................................4
INSTALLATION QUICK TIPS – BTH 120 AND 150: GAS PRESSURE
.............................6
INSTALLATION QUICK TIPS – BTH 199 AND 250 GAS PRESSURE
.............................7
INSTALLATION QUICK TIPS – BTH 300, 400, 500 GAS PRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
INSTALLATION QUICK TIPS – BTH 300, 400, 500
............................................9
INSTALLATION – VENTING CATEGORY AND MATERIALS
...................................10
VENTING TABLES – BTH 120 - 250
......................................................11
VENTING TABLES – BTH 300, 400, 500
...................................................11
CONCENTRIC VENTING
...............................................................12
VENT CONDENSATION
...............................................................13
VENTING – ALL MODELS – SINGLE PIPE DIRECT VENT – USING OUTSIDE AIR TERMINATION
CLEARANCES SIDEWALL POWER VENT
.................................................14
VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR TERMINATION
CLEARANCES SIDEWALL DIRECT VENT
.................................................15
VENT TERMINATION – DIRECT VENT – ALL MODELS
......................................16
DIRECT VENTING – ALL MODELS
.......................................................17
CONTROL OVERVIEW
................................................................18
ADJUSTING TANK TEMPERATURE – OPERATING SET POINT – DIFFERENTIAL
.................20
CHANGING THE DISPLAY UNITS
.......................................................22
FAULT AND WARNING CONDITIONS – ADVANCED DIAGNOSTIC INFORMATION
................24
ACCESS TO THE CURRENT FAULT OR WARNING
.........................................25
FAULT CODES
.......................................................................26
VIEWING THE FAULT HISTORY – VIEWING INFORMATION ABOUT THE HEATER
................27
CONTROL SEQUENCE (TYPICAL ALL MODELS)
...........................................28
CONTROL SEQUENCE FLOW CHART
...................................................29
CONTROLS – CENTRAL CONTROL BOARD – CCB
.........................................30
CONTROLS – GAS CONTROL VALVE BTH 120
............................................32
CONTROLS – GAS CONTROL VALVE BTH 150
............................................32
CONTROLS – GAS CONTROL VALVE BTH 199 AND 250
.....................................33
CONTROLS – GAS CONTROL VALVE, ORIFICE CHART - BTH 300/400 - 100/101
.................34
CONTROLS – GAS CONTROL VALVE, ORIFICE CHART – BTH 400/500
........................35
CONTROLS – PRESSURE SWITCHES – ALL MODELS
......................................36
CONTROLS – PRESSURE SWITCHES – BTH 120 THROUGH 250
.............................37
CONTROLS – PRESSURE SWITCHES – BTH 300, 400, 500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
CONTROLS – CONNECTIONS, IGNITER, FLAME SENSOR, SIGHT GLASS, POWERED ANODES
...39
HOT SURFACE IGNITER / FLAME SENSOR / CONTROL TIMING
..............................40
BLOWER SPEED CONTROL BTH 199 AND 250
............................................41
VARIABLE FREQUENCY DRIVE – BTH 400 AND 500
........................................42
VARIABLE FREQUENCY DRIVE – BLOWER SPEED AND PRESSURE READINGS
................43
WIRING DIAGRAM – BTH 120 - 300
......................................................44
WIRING DIAGRAM – BTH 400, 500
......................................................45

A.O. Smith BTH 120 Series Specifications

General

Brand	A.O. Smith
Model	BTH 120 Series
Category	Water Heater
Language	English