Electrical-guide.doc

Electrical-guide.doc - SEISCO Product Manual Electrical...

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SEISCO Product Manual — Electrical Requirements 1 SEISCO ELECTRICAL SERVICE REQUIREMENTS & SAMPLE LOAD CALCULATIONS A. Introduction to SEISCO Electrical Requirements B. National Electric Code Rules – Load Calculations C. Sample Residential Load Calculations D. National Electric Code Rules - Branch Circuit Protection E. SEISCO Electrical Wiring & Breaker Guides F. Single and Three Phase Wiring Diagrams
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SEISCO Product Manual — Electrical Requirements 2 A. Introduction to Seisco Electrical Requirements The Seisco is a flow-through electric water heater that generally requires more power (kW) to operate than an electric storage tank heater. The trade-off of using more power to heat with the Seisco, only as it is needed, proves to be a better alternative to using less power while heating a storage tank heater, whether you need it or not. The energy savings associated with the flow- through (or on-demand) technology of the Seisco versus storage tank heating is discussed in the Cost Comparison section of this manual. Like most electric storage tank water heaters, the Seisco heater requires 240 volts (AC) (or 208 VAC) to operate. Several Seisco heaters require multiple double pole circuits and breakers (see the chart below for 240 volt electrical ratings and requirements). Ratings for 208 volt commercial service and 208 volt ratings can be found in the Product Description & Specification section of this manual. CHART - SEISCO ELECTRICAL RATINGS Seisco Model Maximum Power Rating (kW) Voltage Rating (VAC) Maximum Current Rating (Amps) Number of Circuits (Two Wire) Number of Circuit Breakers (Double Pole) Circuit Breaker Size (Amps) RA-9 9 240 37.5 1 1 40 RA-11 11 240 46 1 1 50 RA-14 14 240 58 2 2 30 RA-18 18 240 75 2 2 40 RA-22 22 240 91 2 2 50 RA-28 28 240 116 4 4 30 Electrical Service: The Seisco heater is considered a non-continuous heating appliance according to the definitions in the National Electric Code, sections NEC 410 and 411. An appliance load that is not continuous for 3 hours or more is considered non-continuous. The Seisco heater, when used for standard domestic hot water applications, is considered a non-continuous heating appliance. Due to the diversity of water heating in a home, the load (amps) contribution of the Seisco heater to the overall service load of the home or building can be calculated using the optional methods of National Electrical Code, sections NEC 220-30 or 220-31. The methods and rules for calculating these loads can be found in the following section of this manual under B. National Electric Code Rules – Load Calculations. For new dwellings, the service load should be calculated using NEC 220-30. For existing dwellings, the service load should be calculated using NEC 220-31. By both calculation methods, the Seisco load is generally added to the service load at 40% of it’s maximum nameplate rating. For instance, the maximum current (amp) rating of the Seisco Model RA-28 is 116 amps and 40% of this rating is about 47 amps. The 47 amps is typically the load added to the
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This note was uploaded on 02/16/2011 for the course EE 472 taught by Professor Dr.ilyagrinberg during the Spring '10 term at SUNY Buffalo.

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Electrical-guide.doc - SEISCO Product Manual Electrical...

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