A.O. Smith 977 Series User Manual

COMMERCIAL WATER HEATER PARTS LIST

Model BTH-300A

Model BTH-400A

POWERED ANODE ASSEMBLY Series 976/977

See Page 7

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

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PART NO. 197177-002

CYCLONE XHE BTH 300A/400A - PARTS LIST

		BTH 300A	BTH 400A
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.

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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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CYCLONE XHE BTH 300A/400A - CONNECTIONS (Continued)

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GAS VALVE

		BTH 300A	BTH 400A
Item	Description	976/977	976/977
1	Switch, Low Gas Pressure ....	9006084215 ...........	9006084215
	LP Gas ..................................	9004474215 ...........	9004474215
2	Valve, NAT Gas ....................	9006085205 ...........	9006085205
	Valve, LP Gas .......................	9006086205 ...........	9006086205
3	Orifice, NAT ..........................	9006090215 ...........	9006091215
	Orifice, LP .............................	9006092215 ...........	9006093215
4	Orifice holder ........................	9006094215 ...........	9006094215

Standard hardware items may be purchased locally.

BLOWER/BURNER ASSEMBLY

		BTH 300A	BTH 400A
Item	Description	976/977	976/977
1	Gasket - 8" ......................................	9006095205 ....	9006095205
2	Shield - Heat ...................................	9006096205 ....	9006096205
3	Gasket - Insulation ..........................	9006097205 ....	9006097205
4	Flange - Burner ...............................	9006098205 ....	9006098205
5	Burner Assembly .............................	9006099205 ....	9006099205
6	Gasket - Burner ..............................	9006100205 ....	9006100205
7	Ignitor ..............................................	9006101205 ....	9006101205
8	Window - Observation.....................	9006102215 ....	9006102215
9	Gasket - Viewport ...........................	9006103215 ....	9006103215
10	Screw - Socket Head Cap ...............	9006104215 ....	9006104215
11	Blower/Motor ...................................	9006105205 ....	9006114205
12	Sensor - Flame ...............................	9006106205 ....	9006106205
13	Coupling - Power Vent ....................	9006107205 ....	9006107205
14	Blower Intake Reducer Assembly. ..	9006108205 ....	9006108205

5

EXHAUST ELBOW, VENT KIT & BLOWER INTAKE PARTS

		BTH 300A	BTH 400A
Item	Description	976/977	976/977
EXHAUST ELBOW AND FITTINGS
1	Exhaust Elbow Assembly ............................................................................................	9006109205 .....	9006109205
2	Tubing .........................................................................................................................	9006110215 .....	9006110215
3	Connector, Exhaust .....................................................................................................	9006111205 .....	9006111205
VENT KIT PARTS
4	Intake/Vent Terminal ...................................................................................................	9006112205 .....	9006112205
5	Wall Plates (2 required) ...............................................................................................	9006113205 .....	9006113205
6	Silicone Sealer, 2 oz. tube ...............................................................................................	181564 .............	181564

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POWERED ANODE ASSEMBLY

		BTH 300A	BTH 400A
Item	Description	976/977	976/977
1	Anode ........................................................................................................	194787 ..........	194787
2	Control Box ............................................................................................	9004595205 ..	9004595205
3	LED w. Lead Wire .....................................................................................	194959 ..........	194959

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A.O. Smith Water Heater Parts Fulfillment

125 Southeast Parkway

Franklin, TN 37068

1-800-433-2545

www.hotwater.com

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