State Industries STC-077 dimensions Horizontal Ducts, Insufficient MAKE-UP AIR, Backdraft

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S U F S E R V I C E H A N D B O O K

I N S T A L L A T I O N

MAKE-UP AIR

Horizontal Ducts

When the heater is installed in an interior room with no roof access for vertical ducts, horizontal make-up ducts should be installed. When using horizontal ducts, two openings are required — within 12 inches (30 cm) of the top of the enclosure and one within 12 inches (30 cm) of the bottom of the enclosure. Each opening shall have a free area of not less than 1 square inch per 2000 BTUH of the total input of all appliances within the enclosure.

INSUFFICIENT MAKE-UP AIR

Backdraft

Insufficient make-up air is a major cause of combustion problems. One common example is in a restaurant installation where exhaust vent equipment was not considered in sizing make-up air requirements. This may result in air being backdrafted by the restaurant exhaust equipment through the heater causing flue gas spillage, flame roll out, improper combustion, inconsistent pilot operation, and/or erratic heater shutdown.

A possible solution to this situation would be to use a SUF with direct venting.

A less common service issue associated with a backdraft or negative pressure room would be the opening or closing of air pressure switches. This may result in erratic or no heater operation.

State Water Heaters

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Technical Training Department

Ashland City, Tennessee © 2004

STC-077

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Contents Commercial SUF Service Handbook Table of ContentsIntroduction Tools RequiredInstallation GAS Supply SpecificationsClearances GAS RequirementsVenting Equivalent Feet of Pipe Intake or ExhaustDirect Venting Vent Length Table Number Minimum Maximum Elbows Pipe FeetVenting Configurations Venting MaterialsHorizontal Installation Vertical Installation Concentric Vent TerminationVenting Clearances SUF ModelExterior Sidewall Clearances Direct Vent Installation AIR RequirementsMAKE-UP AIR Direct Communication Vertical DuctsHorizontal Ducts Insufficient MAKE-UP AIRBackdraft Contaminated AIR Flammable ItemsMultiple Unit Water Piping Condensation Operation Sequence of OperationNormal Indications / Readings / Settings ControlsDuring Call for Heat Circut Boards Display Circuit Board Ignition Circuit BoardTroubleshooting PRE-SERVICE TipsVAC to Control VAC to Control BoardTransformer VAC to TransformerVAC from Transformer ECO Check VAC to ECOVAC from ECO Check for 24 VAC Between PIN 1 on CN3 Plug and GroundTemperature Probe Temperature Probe ResistanceUpper Lower Temperature Probe PlugPressure Switch Continuity Pressure Switch Continuity TestBlower VAC to BlowerPressure Switch Performance Take AIR and GAS Pressure ReadingsAmbient Room AIR Pressure Pressure Switch Continuity Test Operational OnlyVAC to Ignitor VAC to IgnitorIgnitor Resistance Ignitor Resistance CheckGAS Valve Test SUF 240 onlyVAC to GAS Valve GAS Pressure Check Supply GAS Pressure TestManifold GAS Pressure Test Component Information Orifice TablePressure Swtches Pressure Switches Pressure Switches Part Number / Activation PRESSURE†Wiring Diagrams Service Aids SUF Muffler T E SQuestions and Answers When should SUF’s be delimed?How often should the anodes be inspected? Error Codes Code IndicationCode #S AboveService Checklist III. GAS Pressure Fill in Blank ALL Units onSUF Models 100 150, 100 199 and 100 State Water HeatersUltra Force SUF Models Replacement Parts Description SUFUltra 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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