State Industries SUF 100 THRU 250 manual HOT Surface Igniter / Flame Sensor / Control Timing

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HOT SURFACE IGNITER / FLAME SENSOR / CONTROL TIMING

HOT SURFACE IGNITER

This water heater is equipped with an electric hot surface igniter. The igniter material is silicone carbide and should not be handled with bare hands because of possible damage to the igniter.

The normal ohm reading at 77°F is listed between 40 and 70 ohms. The minimum igniter current monitored by the CCB is 2.7 amps. Once this threshold is met a check mark will appear by the igniter icon in the UIM (display).

FLAME SENSOR

This water heater is equipped with an electronic flame sensor. The flame sensor senses flame by passing a small electric current through the burner flame. This type of flame sensing is also known as flame rectification. The CCB is looking for a minimum current of .7 micro amperes for the water heater to operate. Once this current is established the UIM will display a flame icon.

CONTROL TIMING

Pre-purge	25 seconds
Igniter Warm-up	17 seconds
Trial for ignition Gas	5 seconds
Control Open
Inter/Post Purge	30 seconds

Servicing should only be performed by a Qualified Service Agent

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Contents

Commercial GAS High Efficiency Water Heaters Page Table of Contents Qualifications IntroductionTools Required General Information GAS Pressure SpecificationsAdjustment Procedure GAS Pressure SUF 120 and 150 Models Installation Quick Tips SUF 120 and 150 GAS PressurePage Important Note Installation Quick Tips SUF 199 and 250 GAS PressureAdjustment Procedure GAS Pressure SUF 300, 400 Installation Quick Tips SUF 300, 400, 500 GAS PressureInstallation Quick Tips SUF 300, 400 Ultra Force Venting Installation Venting Category and MaterialsVent Length Table Equivalent Feet Meters 120 through Venting Tables SUF 120Vent Length Table Equivalent Feet Meters 300, 400 Concentric Venting What does the PH Scale MEAN? Vent CondensationCan I Drain this Condensation to the Floor DRAIN? What about the PH Values of Condensate and Soda POP?Power Vent Direct Vent Vent Termination Direct Vent ALL Models PVC Elbow Direct Venting ALL ModelsControl Overview Set Point Status Icon DescriptionDisplay Adjusting Tank Temperature Operating SET Point DifferentialAction Display ActionPress Update to accept the change or Cancel to reset it Changing the Display Units Press Update to accept the change or Cancel to reject it Example of a Warning Example of a Fault Advanced Diagnostic InformationTo get to the current fault information screen, press Menu Access to the Current Fault or WarningPress the Down button for more information Fault Codes Viewing Information About the Water Heater Typical Sequence Control Sequence Typical ALL ModelsControl Sequence Flow Chart Controls Central Control Board CCB This is the back of the UIM Controls GAS Valve SUF Controls GAS Valve SUF 199 High Altitude InstallationGAS Orifice Controls GAS Valve SUF 199 Orifice Chart SUF 300 Controls GAS VALVE, Orifice Chart SUF 300/400Orifice Chart SUF Controls GAS VALVE, Orifice Chart SUF Blocked Inlet Proving Switch Controls Pressure Switches ALL Models Blower Proving Switch Blocked Outlet Proving SwitchControls Pressure Switches SUF 120 Through Controls Pressure Switches SUF 300, 400 Page Control Timing HOT Surface Igniter / Flame Sensor / Control TimingHOT Surface Igniter Flame SensorModel High Speed Hz Low Speed Hz Blower Speed Control SUF 199Variable Frequency Drive SUF 400 Voltage Frequency Speed Instructions VFD Model SUF Variable Frequency Drive Blower Speed and Pressure ReadingsUser Interface Modul Wiring Diagram SUF 120User Interface Module Wiring Diagram SUF 400Tennessee Waltz Parkway Ashland City, TN