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Pressure switch layout pressure switch wiring, Pressure swtches, Blower – A.O. Smith 960 through 967 User Manual

Page 36: Gas valve, Low gas pressure switch

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BTH S E R V I C E H A N D B O O K

C O M P O N E N T

N F O R M A T I O N

PRESSURE SWTCHES

PRESSURE SWITCH LAYOUT

PRESSURE SWITCH WIRING

Notes:
Low Gas Pressure Switch

(BTH 120 a 250 only)

is installed on the inlet

side of the Gas Valve.

N.O. = Normally Open
N.C. = Normally Closed

Blower

Blocked Inlet Switch

N. C. Contacts

Blower Prover Switch

N. 0. Contacts

Blocked Outlet Switch

N. C. Contacts

LOW GAS

PRESSURE

BTH 120 & 250

(normally open)

.BLOCKED

I

OUTLET(FLUE)

(normally closed)

BLOWER
PROVER

(normally open)

.BLOCKED

I

INLET

(normally closed)

AA

AA

CN6 Plug

Control Board

GAS VALVE

I

Low Gas Pressure Switch

A. O. Smith Water Products Co.
Ashland City, Tennessee © 2004

35

Technical Training Department

TC-044 Revision 6

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