State Industries SUF-100-250, SUF-60-120 Gas Valve Side View, 120,000 & 150,000 Btu/hr MODELS

Lighting The Water Heater

1.SUF 120 & 150 models: turn the on/off switch on the gas valve to the "on" position, see Figure 57 and Figure 58.

2.Turn the water heater’s on/off switch to the “on” position.

3.Wait for the control system to complete its boot up sequence. The Desktop screen showing the current Operating Set Point and Tank Temperature will be displayed on the control system’s LCD when the boot up sequence is complete.

4.Using the control system menus and UIM (user interface module), change the Operating Set Point to a setting higher than the current tank temperature displayed on the control system LCD plus the Differential setting to activate a call for heating. See Control System Operation on page 44.

	MANIFOLD GAS
	PRESSURE REGULATOR
	COVER SCREW
SUPPLY GAS		MANIFOLD GAS
PRESSURE TAP		PRESSURE TAP
1/8’ NPT PLUG		1/8’ NPT PLUG
INLET	OFF ON	OUTLET
ON/OFF
SWITCH
	GAS VALVE TOP VIEW
120,000 & 150,000 Btu/hr MODELS

Figure 57

5.Record the manifold gas pressure when the 24 Volt Gas Valve is energized and the Main Burner is ignited, the animated gas valve icon will be displayed on the Desktop screen of the control system’s LCD when the control system energizes the 24 Volt Gas Valve, a animated flame icon will appear when Main Burner ignition is successful, see the Status Icons descriptions in Table 11 on page 45.

	ON/OFF
	SWITCH
	LOW GAS
	PRESSURE
	SWITCH
GAS VALVE	1/8” NPT
OUTLET
	TEE FITTING
	SUPPLY GAS
MANIFOLD GAS	PRESSURE TAP
PRESSURE TAP	1/8’ NPT PLUG
1/8’ NPT PLUG	BOTTOM OF TEE
	GAS VALVE SIDE VIEW
120,000 & 150,000 Btu/hr MODELS

Figure 58

6.Compare the actual manifold gas pressure reading recorded above to the required minimum/maximum values given in Table 4 on page 14. Adjust manifold gas pressure as necessary, see Manifold Gas PressureAdjustment on page 54.

7.Record the supply gas pressure when the 24 Volt Gas Valve is energized and the Main Burner is ignited. This is a “dynamic”

gas pressure reading; while the water heater is firing.

8.Compare the actual supply gas pressure reading recorded above to the required minimum/maximum values given in Table 4 on page 14. Adjust supply gas pressure as necessary, see Supply Gas Pressure Adjustment on page 54.

9.When complete turn off gas to the water heater, see instructions on page 55. Disconnect manometers and replace all pipe plugs removed for testing. Ensure all test port needle valves opened during testing are completely closed.

MANIFOLD GAS	SUPPLY GAS
PRESSURE	PRESSURE
TEST PORT	TEST PORT

GAS

VALVE

COMBUSTION BLOWER CONNECTION

COMBUSTION AIR INLET

VENTURI

GAS VALVE / VENTURI ASSEMBLY TOP VIEW

199,000 & 250,000 Btu/hr MODELS

	Figure 59
MANIFOLD GAS	SUPPLY GAS
	PRESSURE
PRESSURE	TEST PORT
TEST PORT

GAS VALVE TOP DETAIL VIEW

199,000 & 250,000 Btu/hr MODELS

Figure 60

GAS	SUPPLY GAS
VALVE	CONNECTION
	LOW GAS
	PRESSURE
	SWITCH
	COMBUSTION
	AIR INLET
	VENTURI
GAS VALVE / VENTURI ASSEMBLY SIDE VIEW
199,000 & 250,000 Btu/hr MODELS

Figure 61

53