State Industries STC-077 GAS Pressure Check, Supply GAS Pressure Test, Manifold GAS Pressure Test

S U F 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

STEP 13

SUPPLY GAS PRESSURE TEST

SUF 150, 199	SUF 150, 199
Propane	Natural
SUF 240 Natural	Gas Valve
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...	THEN
supply gas pressure is not between 5.0 and 14” W.C.	adjust supply gas pressure (Recommended supply
natural gas or 11.0 and 14” W.C. propane	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:	adjust manifold gas pressure to values given for model
natural gas models	and fuel type (within 0.3” W.C. tolerance)
	if manifold gas pressure cannot be adjusted to
3.5” W.C. ± 0.3” – SUF 155 & 199
	maintain values given (within 0.3” W.C. tolerance)
4.0” W.C. ± 0.3” – SUF 240
	replace gas valve.
propane gas models
10.0” W.C. ± 0.3” – all propane gas models.
manifold gas pressure is within tolerances given above	ignition should occur.

State Water Heaters	31	Technical Training Department
Ashland City, Tennessee © 2004		STC-077