State Industries STC-077 dimensions GAS Valve Test, SUF 240 only, VAC to GAS Valve

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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 VALVE TEST

STEP 12

24 VAC TO GAS VALVE

SUF 240 ONLY

STEP 12: CHECK FOR 24 VAC TO GAS VALVE DURING TRIAL FOR IGNITION. Condition:

•All wires are reconnected.

•On/Off switch is on.

•Call for heat is activated.

•Perform test at end of ignitor warm up period.

Touch meter probes to wiring terminals on gas valve with wires from control board still connected during the ignitor warm up period.

IF…

AND

THEN

 

 

 

 

 

 

 

 

24

VAC is not present to gas valve

 

replace control board if Step 9A and 9B have

 

 

 

been performed and results were successful.

 

 

 

 

24

VAC is present

gas does not flow to burner

check for/restore supply gas;

 

 

 

check for/clear any restriction in the gas train;

 

 

 

replace the gas valve if the valve will not open

 

 

 

with 24 VAC applied.

 

 

 

 

24

VAC is present

gas does flow to burner

continue to Step 13.

 

 

 

 

Technical Training Department

30

State Water Heaters

STC-077

Ashland City, Tennessee © 2004

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Page 30 Page 32
Contents Commercial Table of Contents SUF Service HandbookTools Required IntroductionGAS Requirements InstallationGAS Supply Specifications ClearancesVent Length Table Number Minimum Maximum Elbows Pipe Feet VentingEquivalent Feet of Pipe Intake or Exhaust Direct VentingVenting Materials Venting ConfigurationsConcentric Vent Termination Horizontal Installation Vertical InstallationSUF Model Venting ClearancesExterior Sidewall Clearances AIR Requirements Direct Vent InstallationMAKE-UP AIR Vertical Ducts Direct CommunicationInsufficient MAKE-UP AIR Horizontal DuctsBackdraft Flammable Items Contaminated AIRMultiple Unit Water Piping Condensation Sequence of Operation OperationControls Normal Indications / Readings / SettingsDuring Call for Heat Display Circuit Board Ignition Circuit Board Circut BoardsVAC to Control Board TroubleshootingPRE-SERVICE Tips VAC to ControlVAC to Transformer TransformerVAC from Transformer VAC to ECO ECO CheckCheck for 24 VAC Between PIN 1 on CN3 Plug and Ground VAC from ECOProbe Plug Temperature ProbeTemperature Probe Resistance Upper Lower TemperaturePressure Switch Continuity Test Pressure Switch ContinuityVAC to Blower BlowerTake AIR and GAS Pressure Readings Pressure Switch PerformanceAmbient Room AIR Pressure Only Pressure Switch Continuity Test OperationalVAC to Ignitor VAC to IgnitorIgnitor Resistance Check Ignitor ResistanceSUF 240 only GAS Valve TestVAC to GAS Valve Supply GAS Pressure Test GAS Pressure CheckManifold GAS Pressure Test Orifice Table Component InformationPressure Swtches Pressure Switches Part Number / Activation PRESSURE† Pressure SwitchesWiring Diagrams Service Aids T E S SUF MufflerWhen should SUF’s be delimed? Questions and AnswersHow often should the anodes be inspected? Above Error CodesCode Indication Code #SIII. GAS Pressure Fill in Blank ALL Units on Service ChecklistState Water Heaters SUF Models 100 150, 100 199 and 100Description SUF Ultra Force SUF Models Replacement PartsUltra Force SUF Controls Parts List T E S Expert’s Choice

STC-077 specifications

The State Industries STC-077 is a notable addition to the realm of high-efficiency water heaters, exemplifying advanced engineering and innovative design. The STC-077 is particularly recognized for its exceptional performance and energy-saving capabilities, making it an ideal solution for both residential and commercial applications.

One of the standout features of the STC-077 is its impressive energy efficiency rating. Utilizing state-of-the-art technology, this water heater operates with a high energy factor (EF) that significantly reduces operating costs compared to traditional water heating systems. This is especially beneficial in today's climate of rising energy costs and increased environmental awareness.

The STC-077 employs a robust stainless-steel tank construction that not only provides durability but also mitigates the risk of corrosion, ensuring longevity and reliability. This innovative design approach helps extend the product's lifespan while maintaining consistent performance throughout its use. Coupled with superior insulation, users can expect minimal heat loss and enhanced energy efficiency, making it a sustainable choice for consumers.

The unit is equipped with advanced controls that provide precise temperature regulation. This feature improves user experience and safety, allowing for customization to meet individual needs. Additionally, the STC-077’s intuitive digital display makes monitoring and adjusting settings straightforward, providing convenience and ease of use.

In terms of capacity, the STC-077 offers versatility with options suitable for various household sizes and demands. Whether for a small apartment or a busy commercial establishment, its modular design allows for seamless integration into existing systems while providing adequate hot water supply.

Furthermore, the STC-077 incorporates innovative technologies aimed at reducing maintenance needs. With easy access for servicing and built-in diagnostics, users can monitor performance proactively, ensuring the unit operates at optimal efficiency.

Overall, the State Industries STC-077 shines as a forward-thinking water heater. Its combination of high energy efficiency, durable construction, advanced technology, and user-friendly features make it a comprehensive solution for those seeking reliable hot water with minimal environmental impact. Whether for homeowners looking to lower energy bills or businesses seeking dependable performance, the STC-077 stands out as a premier choice in water heating solutions.
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