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

PRESSURE SWITCH PERFORMANCE (CONTINUED)

STEP 9B

PRESSURE SWITCH CONTINUITY TEST — OPERATIONAL

SUF 240

ONLY

Air pressure switches

Low gas pressure switch

STEP 9B: CHECK FOR CONTINUITY BETWEEN PRESSURE SWITCH TERMINALS WITH WIRES REMOVED AND BLOWER RUNNING.

Condition:

•All wires are disconnected from all pressure switches — ends are taped off.

•On/Off switch is on.

•Call for heat is activated.

•Blower is running during trial for ignition.

•Multimeter is set to lowest ohms scale.

The wires disconnected are energized with 24 VAC from the control board. Do not allow these wires to touch ground — use electrical tape to insulate wire connects during this test.

Check for continuity with an ohm meter between terminals on all pressure switches with the wires removed and the blower running during a trial for ignition. Restart the water heater as needed.

The pressure switches are wired together in a “series” circuit. For the water heater to continue to fire and satisfy a call for heat the control board must sense a closed pressure switch circuit.

IF…

THEN

 

 

 

 

continuity is not present between terminals on

if the pressure recorded in Step 9A is within the value shown in

one or more pressure switches — the switch

the table for the switch contacts to remain closed — replace the

contacts are open.

pressure switch.

compare the pressure reading recorded in Step

if the pressure recorded in Step 9A is not within the value shown

9A to the value given for that switch in the table

in the table for the switch contacts to remain closed — check for/

on page 34.

clear any restrictions in the vent and/or air intake piping, check

compare to value for correct Model and Series

for an excessive number of elbows or equivalent feet of pipe

used in the vent and/or air intake piping.

number in table.

check for/restore minimum supply gas pressure — Step13.

 

 

 

continuity is present.

continue to Step 10.

 

 

State Water Heaters

27

Technical Training Department

Ashland City, Tennessee © 2004

STC-077

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Image 28
State Industries STC-077 dimensions Only, Pressure Switch Continuity Test Operational
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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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