A.O. Smith NW 37-670 warranty Typical Wiring Diagrams, Electrical Configuration Table

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ELECTRICAL CONFIGURATION TABLE

Boiler

Type

 

 

Voltage Between

Control

Elements

Nameplate

of

 

 

Boiler Terminal

Circuit

Quantity

Element

Markings

Service

 

 

 

Lugs

 

Voltage

Per

Operating

Voltage

Phase

 

 

 

 

 

 

(1 Phase)

Contractor

Voltage

 

1

 

L1

L2

N

G

 

 

 

 

 

 

 

 

120

1

208

 

 

 

208

 

 

 

 

 

 

 

 

 

 

 

 

208

 

 

 

120

 

 

 

 

 

 

 

L1

L2

L3

N

G

 

 

 

 

3

Delta

 

 

 

 

 

(With

208

208

208

 

 

120

1

208

 

 

 

 

 

 

 

Neutral)

 

 

 

120

 

 

 

 

 

1

 

L1

L2

G

 

 

120

1

240

 

 

240

 

 

 

 

 

 

 

 

 

 

 

 

240

 

 

L1

L2

L3

G

 

 

 

 

 

 

 

 

 

 

 

 

3

Delta

240

240

240

 

 

120

1

240

 

 

 

 

 

 

 

 

 

 

480

3

Wye*

L1

L2

L3

G

 

120

1 or 2

277

480

 

480

 

 

 

 

 

480

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

480

3

Delta

L1

L2

L3

G

 

120

1or 2

480

480

 

480

 

 

 

 

 

480

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Neutral lug not necessary and not furnished due to three wire wye connection. This means only three wires (no neutral) brought to boiler due to method of element connection. Elements operate at 277 volts.

Voltage from a conductor to ground (electrical raceway and water pipes) is not measured. No ground lug furnished. If required installer can provide locally.

TYPICAL WIRING DIAGRAMS

The following wiring diagrams are included in this manual to show typical arrangements of electrical components in the control and power circuits by voltage and phase charactreristics. They are to be used as a reference by the installer or servicer in performing their work. A diagram of the boiler wiring is furnished with the boiler.

WIRING DIAGRAM 208V OR 240V THREE-PHASE (DELTA) WITH STEP CONTROL

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Contents DURA-POWER Models NW 37 Dimensional Data Sizes and Data 45KW Thru 720KWSizes and Data 780KW Thru 3300KW Model and Rating Plate ELECTRICAL/RECOVERY DataWater Boiler Specifications Features ForewordApprovals GroundingInstallation Power Circuit Calculating Amperage/Overcurrent ProtectionBoiler Circuits Control CircuitTypical Wiring Diagrams Electrical Configuration TableSystem Cleaning Failure to clean the system may causeOperation FillingMaintenance Checklist System Water TestService and Repair Expense Claim ProcedureTank ALL Other Parts

NW 37-670 specifications

A.O. Smith NW 37-670 is a highly regarded water heater that stands out in the residential water heating market. Renowned for its efficiency and reliability, this unit offers homeowners a perfect blend of advanced technology, high performance, and convenience.

One of the main features of the A.O. Smith NW 37-670 is its high recovery rate, which allows for rapid heating of water to meet the demands of a busy household. With a 37-gallon tank capacity, this model can effectively supply hot water for various applications, such as showers, dishwashing, and laundry. The design incorporates a powerful heating element that ensures the water is heated quickly, thus minimizing wait times and improving overall comfort.

Efficiency is a cornerstone of the NW 37-670's design. This water heater features an impressive Energy Factor (EF), which translates to lower energy bills for homeowners. A.O. Smith has integrated advanced insulation materials to maintain water temperature longer, reducing the energy required for reheating. This not only helps in cutting down costs but also promotes eco-friendliness, making it an excellent option for environmentally conscious consumers.

The technology behind the A.O. Smith NW 37-670 includes a state-of-the-art electronic control system. This system continuously monitors the unit's performance and adjusts operations to optimize efficiency. Additionally, the water heater is equipped with a robust diagnostic system that provides real-time feedback, making it easier for homeowners to identify any potential issues before they escalate.

Durability is another defining characteristic of the NW 37-670. Constructed with high-quality materials, including a glass-lined tank for added protection against corrosion, this water heater is designed to last for years with minimal maintenance. The anode rod further enhances its longevity by reducing the potential for rust and increases the lifespan of the unit.

Installation and maintenance are straightforward due to the user-friendly design of the A.O. Smith NW 37-670. It can fit into various spaces, making it a versatile option for both new constructions and replacement projects. A.O. Smith also provides comprehensive support and warranty services, ensuring customer satisfaction and peace of mind.

In summary, the A.O. Smith NW 37-670 is a top-tier water heater that combines efficiency, advanced technology, and durable construction. With its substantial capacity, rapid recovery rate, and modern control features, it is an excellent choice for any home looking for dependable hot water solutions.
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