Gas Pressure Check - State Water Heaters Utra-Force STC-077 Service Handbook

STEP 13 SUPPLY GAS PRESSURE TEST
SUF 150, 199
Propane
SUF 240 Natural
Gas Valve
STEP 13: CHECK AND ADJUST SUPPLY GAS PRESSURE.
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...
supply gas pressure is not between 5.0 and 14" W.C.
natural gas or 11.0 and 14" W.C. propane
proper supply gas pressure is present
STEP 14 MANIFOLD GAS PRESSURE TEST
STEP 14: CHECK AND ADJUST MANIFOLD GAS PRESSURE.
IF...
manifold gas pressure is not:
natural gas models
3.5" W.C. ± 0.3" – SUF 155 & 199
4.0" W.C. ± 0.3" – SUF 240
propane gas models
10.0" W.C. ± 0.3" – all propane gas models.
manifold gas pressure is within tolerances given above
State Water Heaters
Ashland City, Tennessee © 2004
S U F S E R V I C E
T R O U B L E S H O O T I N G

GAS PRESSURE CHECK

31
H A N D B O O K
SUF 150, 199
Natural
Gas Valve
THEN
adjust supply gas pressure (Recommended supply
minimum is 7.0" W.C. for natural gas models)
continue to Step 14.
THEN
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.
ignition should occur.
Technical Training Department
STC-077