A.O. Smith BTH 150

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A. O. Smith Water Products Company Service Handbook

Irving, Texas 2000

Training Department

NORMAL INDICATIONS / READINGS

AFTER TANK IS SATISFIED

Tank temperature above control setting

• On/off switch is “on”

Normal conditions will be 120 volts present to ground and:

• Each black terminal of on/off switch

• CN 1 black term 1

• CN 4 black term 1

Note: CN 6 black term 2 (flame sensor) may display 90-100 VAC – this is a non-reading, ignore it

24 VAC present to ground and:

• CN 3 red term 1 and red term 4

• CN 4 blue term 4

• CN 6 brown term 4

• Blocked inlet switch – each terminal (tube connects to inlet of blower)

• Blower prover switch – upper terminal (this is the jumper wire from the blocked inlet switch)

Control panel indication light “on”

• On/off switch light

• 120 VAC

• 24 VAC

• High limit

• Control status

• Current (average) tank temperature will be displayed

(BTH 120, 250 Only)

A.O. Smith BTH 150 - Controls