A.O. Smith BTH-120 through BTH-500, Instruction Manual

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2
Direct Vent Installation ..................................................................... 25
Vertical Termination Installation ....................................................... 27
Sidewall Termination Installation...................................................... 29
Concentric Termination Installation .................................................. 30
4 Inch Concentric Termination Installation ....................................... 31
Venting Arrangements ..................................................................... 34
Termination Clearances Sidewall Power Vent ................................. 36
Termination Clearances Sidewall Direct Vent .................................. 37
WaTER HEaTER INsTallaTIoN ........................................................ 38
Condensate Drain Installation ......................................................... 38
supply Gas line Installation ............................................................ 39
Gas line leak Testing ..................................................................... 40
Purging ............................................................................................ 40
Electrical Wiring ............................................................................... 41
Water Line Connections .................................................................. 42
T&P Valve Discharge Pipe ............................................................... 42
TEmPERaTuRE REGulaTIoN .......................................................... 43
High Temperature Limit Control (ECO) ............................................ 43
Thermostat Control .......................................................................... 43
CONTrOL SySTEm OPErATION ...................................................... 44
Overview .......................................................................................... 44
Control System Navigation .............................................................. 44
User Settings & Control System menus .......................................... 47
sTaRT uP ............................................................................................ 52
Prior to start up ............................................................................... 52
Initial start up .................................................................................. 52
Checking The Firing rate ................................................................ 55
High Altitude Installations ................................................................ 55
lIGHTING THE WaTER HEaTER ....................................................... 56
lighting & operation labels ............................................................ 56
TRoublEsHooTING ......................................................................... 58
Installation Checklist ........................................................................ 58
Sequence Of Operation ................................................................... 58
Sequence Of Operation Flow Chart ................................................ 59
Operational Problems ...................................................................... 60
Fault And Alert Conditions ............................................................... 61
mAINTENANCE ................................................................................... 64
General ............................................................................................ 64
maintenance Schedule .................................................................... 64
Draining And Flushing ..................................................................... 64
Filling The Water Heater .................................................................. 65
Sediment removal .......................................................................... 65
Lime Scale removal ........................................................................ 65
Powered Anode rods ...................................................................... 66
Drain Valve and Access Panels ....................................................... 66
Vent System .................................................................................... 66
DIaGRams .......................................................................................... 67
CCB - Central Control Board Layout ............................................... 67
BTH 120 & 150 Wiring Diagram ...................................................... 68
BTH 199 & 250 Wiring Diagram ...................................................... 69
Circulation Pump Wiring Diagrams .................................................. 70
Water Piping Diagrams .................................................................... 71
LImITED WArrANTy .......................................................................... 78
taBle of contents
SAFE INSTALLATION, USE AND SErVICE.......................................... 3
APPrOVALS .......................................................................................... 3
GENErAL SAFETy INFOrmATION ...................................................... 4
Precautions ........................................................................................ 4
GrOUNDING INSTrUCTIONS ........................................................ 4
Hydrogen Gas Flammable ................................................................. 4
INTrODUCTION .................................................................................... 6
Abbreviations Used ........................................................................... 6
Qualifications ..................................................................................... 6
iCOmm™ & BACnet Compatible ....................................................... 6
Preparing For The Installation ........................................................... 6
FEATUrES AND COmPONENTS ......................................................... 7
Basic Operation ................................................................................. 7
Top Views .......................................................................................... 8
Side Views ....................................................................................... 10
INSTALLATION CONSIDErATIONS .................................................... 11
rough In Dimensions ....................................................................... 11
Locating The Water Heater .............................................................. 12
Extended Vent Terminations ............................................................ 13
Optional Concentric Terminations .................................................... 13
Hard Water ...................................................................................... 13
Circulation Pumps ........................................................................... 13
Insulation blankets .......................................................................... 13
INsTallaTIoN REquIREmENTs ...................................................... 14
Gas Supply Systems ....................................................................... 14
supply Gas Regulator ..................................................................... 14
Power Supply .................................................................................. 14
mixing Valves ................................................................................... 15
Dishwashing machines .................................................................... 15
Closed Water Systems .................................................................... 15
Thermal Expansion .......................................................................... 15
Temperature-Pressure relief Valve ................................................. 16
Condensate Drain ............................................................................ 17
Combustible material Storage ......................................................... 17
Contaminated Air ............................................................................. 17
Air requirements ............................................................................. 18
Unconfined Space ........................................................................... 18
Confined Space ............................................................................... 18
Fresh Air Openings For Confined Spaces ....................................... 19
Outdoor Air Through Two Openings ................................................ 19
Outdoor Air Through One Opening .................................................. 19
Outdoor Air Through Two Horizontal Ducts ..................................... 19
Outdoor Air Through Two Vertical Ducts .......................................... 20
Air From Other Indoor Spaces ......................................................... 20
INSTALLATION rEQUIrEmENTS - COmmONWEALTH OF
mASSACHUSETTS ..............................................................................
21
VENTING INSTALLATION ................................................................... 22
General Venting Information ............................................................ 22
General Venting Instructions ........................................................... 22
BTH 199 & 250 Intake Air Connection ............................................. 23
Venting requirements ..................................................................... 24
Venting Installation Sequence ......................................................... 25
Power Vent Installation .................................................................... 25