A.O. Smith 977, 976 User Manual
POWERED ANODE ASSEMBLY
See Page 7
BLOWER/BURNER ASSEMBLY
See Page 5
COMMERCIAL WATER HEATER PARTS LIST
Model BTH-300A
Model BTH-400A
Series 976/977
OPERATING CONTROL WIRING
See Page 3- 4
CYCLONE XHE - MODEL BTH-300A/400A
See Page 2
CONTROL PANEL
See Page 3
GAS VALVE
See Page 5
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
Item Description 976/977 976/977
1 Cleanout Gasket ........ 9004099015 ....... 9004099015
2 Cover, Cleanout ......... 9004098005 ....... 9004098005
3 Temperature and
Pressure Relief Valve... 9005903205 ....... 9005903205
Standard hardware items may be
purchased locally.
BTH 300A BTH 400A
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CYCLONE XHE BTH 300A/400A - OPERATING CONTROLS & WIRING (See Next Page)
BTH 300A BTH 400A
Item Description 976/977 976/977
1 Switch, On/Off ....................................................................................... 9005929215 ... 9005929215
2 VFD & Control Assembly..............................................................................------.......... 9006081205
3 Transformer........................................................................................... 9004515205 ... 9004515205
4 Probe, Upper ......................................................................................... 9004238215 ... 9004238215
5 Probe, Lower ......................................................................................... 9004241215 ... 9004241215
6 Display Board ........................................................................................ 9004593205 ... 9004593205
7 Cable Assembly .................................................................................... 9006082215 ... 9006082215
8 Switch, Blocked Inlet ............................................................................. 9006083215 ... 9006006215
9 Blower Prover Air Switch ....................................................................... 9004586215 ... 9006002215
10 Switch, Natural Low Gas Pressure........................................................ 9006084215 ... 9006084215
10 Switch, LP Low Gas Pressure ............................................................... 9004474215 ... 9004474215
11 Valve, Natural Gas ................................................................................ 9006085205 ... 9006085205
11 Valve, LP Gas ....................................................................................... 9006086205 ... 9006086205
12 Switch, Blocked Outlet .......................................................................... 9006087215 ... 9006088215
13 Tubing, 1/4" ID, PVC ............................................................................. 9006089215 ... 9006089215
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