State Industries SUF 130 THRU 500 Controls Pressure Switches ALL Models, Blower Proving Switch

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CONTROLS – PRESSURE SWITCHES – ALL MODELS

All SUF models are provided with four pressure switches. These switches are essential to the safe and proper operation of the unit. The switches are wired to the central control board (CCB) individually and each is monitored individually. The (CCB) is set up to shut the unit down whenever there is a failure of any of the switches and declare a fault for each individual switch. It is important to understand the purpose of each switch.

Low Gas Pressure

Switch

Pressure

Switches

BLOWER PROVING SWITCH

The Blower Proving Switch is provided on the heater to verify that the fan is operating. It is a positive pressure switch whose electrical contacts are normally open. The blower proving switch electrical contacts will close on a rise in pressure as the blower increases the pressure in the burner. This switch is connected to the burner tap by a piece of Tygon (soft plastic) tubing. This tubing must be connected in order for the switch to close the electrical contacts. The controller requires that the electrical contacts on this pressure switch be open before it will allow the blower to come on. The control will declare a fault on the UIM if either condition occurs.

BLOCKED OUTLET PROVING SWITCH

The blocked outlet proving switch electrical contacts are normally closed. The blocked outlet proving switch electrical contacts will open on a rise in pressure. Check to see if the condensate is allowed to flow freely from the exhaust elbow and for obstructions in the exhaust venting and exhaust vent terminal. Also check that the equivalent feet of vent pipe for the specific model has not been exceeded. Check the vent length tables on page 11.

BLOCKED INLET PROVING SWITCH

The Blocked Inlet Proving switch electrical contacts are normally closed. The blocked inlet proving switch electrical contacts will open when an increase in negative pressure (vacuum) occurs in the intake vent pipe. The switch is connected to the pressure tap on the PVC flange connected to the inlet of the blower. When this switch prevents the unit from igniting, most likely the intake is blocked by some means. Verify that the air intake pipe and air intake vent terminal are free of obstructions that may prevent air from entering the unit. Also check that the equivalent feet of vent pipe for the specific model has not been exceeded. Check the vent length tables on page 11.

LOW GAS PRESSURE SWITCH

The Low Gas Pressure Switch electrical contacts are normally open. The low gas pressure switch electrical contacts will close on a rise pressure. The contacts will open when the pressure falls below the fixed set point. If this happens during a heating cycle the burner will be shut down and a fault will be declared on the UIM.

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 MaterialsVenting Tables SUF 120 Vent Length Table Equivalent Feet Meters 120 throughVent 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 InformationAccess to the Current Fault or Warning To get to the current fault information screen, press MenuPress 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 High Altitude Installation Controls GAS Valve SUF 199GAS 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 SUFBlocked Inlet Proving Switch Controls Pressure Switches ALL ModelsBlower 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

SUF 100 THRU 250, SUF 130 THRU 500, SUF 60 THRU 120 specifications

State Industries has long been a leader in the manufacturing of high-quality water heaters, particularly known for its SUF series. The SUF 60 thru 120, SUF 130 thru 500, and SUF 100 thru 250 models are excellent examples of State Industries’ commitment to efficiency, performance, and innovation. These units are designed to meet a range of residential and commercial water heating needs, showcasing advanced engineering and durability.

The SUF series is primarily built for heavy-duty applications, offering various capacities to accommodate different demands. The SUF 60 thru 120 models are ideal for residential settings, providing dependable hot water solutions with capacity options ranging from 60 to 120 gallons. These units utilize high-quality insulation to minimize heat loss, resulting in improved efficiency and cost-effectiveness.

Moving to the SUF 130 thru 500 series, these models are tailored for larger commercial applications. With capacities extending up to 500 gallons, they are perfect for industries where high volume and consistent hot water supply are essential. The SUF 130 thru 500 models feature robust heating elements and advanced thermostats for precise temperature control, ensuring the delivery of hot water on demand.

The SUF 100 thru 250 units straddle the line between residential and light commercial applications. With capacities from 100 to 250 gallons, these water heaters are versatile and adaptable to various settings. They integrate cutting-edge technology that enhances safety, such as multi-level safety controls and automatic shut-off systems, ensuring user protection while maximizing performance.

Each SUF model is designed with longevity in mind. The tanks are constructed from high-grade materials that resist corrosion and wear, featuring factory-installed anode rods to enhance the lifespan even further. The energy-efficient design of these water heaters meets or exceeds current energy conservation standards, providing an eco-friendly solution without compromising on output.

In summary, State Industries’ SUF 60 thru 120, SUF 130 thru 500, and SUF 100 thru 250 models exemplify the brand’s dedication to quality and innovation. With various capacities, advanced technologies, and a focus on efficiency and durability, these water heaters cater to diverse needs, ensuring reliable hot water supply for years to come.
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