AO Smith Water Heater 976 Series User Guide

COMMERCIAL WATER HEATER PARTS LIST  
Model BTH-300A  
Model BTH-400A  
POWERED ANODE ASSEMBLY  
See Page 7  
Series 976/977  
OPERATING CONTROL WIRING  
See Page 3- 4  
CYCLONE XHE - MODEL BTH-300A/400A  
See Page 2  
BLOWER/BURNER ASSEMBLY  
See Page 5  
GAS VALVE  
See Page 5  
CONTROL PANEL  
See Page 3  
EXHAUST ELBOW, VENT KIT & BLOWER  
INTAKE PARTS  
See Page 6  
PRINTED IN U.S.A. 0606  
PART NO. 197177-002  
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CYCLONE XHE BTH 300A/400A - PARTS LIST  
BTH 300A  
976/977  
BTH 400A  
976/977  
Item Description  
1
2
3
Cleanout Gasket ........ 9004099015 ....... 9004099015  
Cover, Cleanout ......... 9004098005 ....... 9004098005  
Temperature and  
Pressure Relief Valve... 9005903205 ....... 9005903205  
Standard hardware items may be  
purchased locally.  
2
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CYCLONE XHE BTH 300A/400A - OPERATING CONTROLS & WIRING (See Next Page)  
BTH 300A  
976/977  
BTH 400A  
976/977  
Item Description  
1
2
Switch, On/Off ....................................................................................... 9005929215 ... 9005929215  
VFD & Control Assembly ..............................................................................------.......... 9006081205  
Transformer........................................................................................... 9004515205 ... 9004515205  
Probe, Upper ......................................................................................... 9004238215 ... 9004238215  
Probe, Lower ......................................................................................... 9004241215 ... 9004241215  
Display Board ........................................................................................ 9004593205 ... 9004593205  
Cable Assembly .................................................................................... 9006082215 ... 9006082215  
Switch, Blocked Inlet ............................................................................. 9006083215 ... 9006006215  
Blower Prover Air Switch ....................................................................... 9004586215 ... 9006002215  
Switch, Natural Low Gas Pressure ........................................................ 9006084215 ... 9006084215  
Switch, LP Low Gas Pressure ............................................................... 9004474215 ... 9004474215  
Valve, Natural Gas ................................................................................ 9006085205 ... 9006085205  
Valve, LP Gas ....................................................................................... 9006086205 ... 9006086205  
Switch, Blocked Outlet .......................................................................... 9006087215 ... 9006088215  
Tubing, 1/4" ID, PVC ............................................................................. 9006089215 ... 9006089215  
3
4
5
6
7
8
9
10  
10  
11  
11  
12  
13  
3
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CYCLONE XHE BTH 300A/400A - CONNECTIONS (Continued)  
4
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