A.O. Smith 960 through 967 - Manual (Page 34)

BTH S E R V I C E H A N D B O O K
T R O U B L E S H O O T I N G
GAS PRESSURE CHECK
Attach manometer or gas pressure gauge to pressure tap on gas valve or use adapter to check
pressure ahead of valve as near as possible to valve. All appliances being served by this gas sup­
ply line should be operating.
IF... THEN
supply gas pressure is not between 5.0 and 14” W.C.
natural gas or 11.0 and 14” W.C. propane adjust supply gas pressure (Recommended supply
minimum is 7.0” W.C. for natural gas models)
proper supply gas pressure is present continue to Step 14.
STEP 14 MANIFOLD GAS PRESSURE TEST
STEP 14: CHECK AND ADJUST MANIFOLD GAS PRESSURE.
IF... THEN
manifold gas pressure is not:
natural gas models
3.5” W.C. ± 0.3” - BTH 155 & 199
4.0” W.C. ± 0.3” - BTH 120 & 250
propane gas models
10.0” W.C. ± 0.3” - all propane gas models.
adjust manifold gas pressure to values given for model
and fuel type (within 0.3” W.C. tolerance)
if manifold gas pressure cannot be adjusted to
maintain values given (within 0.3” W.C. tolerance)
replace gas valve.
manifold gas pressure is within tolerances given above ignition should occur.
A. O. Smith Water Products Co.
Ashland City, Tennessee © 2004
33
Technical Training Department
TC-044 Revision 6