A.O. Smith BTH 150

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A. O. Smith Water Products Company Service Handbook

Irving, Texas 2000©

Training Department

120 VAC present to ground and:

• Each black terminal of on/off switch

• CN1 black term 1

• CN 2 black term 1

• CN 4 black term 1

• CN 5 white term 1 (only while ignitor is heating)

Note: CN 6 black term 2 will give reading of 90-100 volts – ignore

this reading.

24 VAC present to ground and:

• CN 3 red term 1 and red term 4

• CN 4 blue term 4

• CN 6 blue term 3, brown term 4, and brown term 6

• Each terminal of the 3 or 4 pressure switches

CYCLONE BTH

NORMAL INDICATIONS / READINGS

A.O. Smith BTH 150 - Page 17