Commercial Electric Hot Water Boilers
A. O. Smith’s Electric Boilers are designed for demanding hydronic and industrial heating needs. A wide variety of available electrical inputs and voltages allow the units to be perfectly matched to the heating requirements of the application and the available electrical services.
FEATURES
MODULATING STEP CONTROL - A solid state modulating step control modulates heat input to match load through progressive sequencing of steps. Standard on models with 90kW or above (optional below 90kW).
INCOLOY IMMERSION HEATERS - Heavy duty medium watt density elements (3 per immersion heater) have incoloy sheathing, provides excellent protection against oxidation and scaling. The input ranges from 45kW to 6,000kW (see accompanying chart).
OPTIONAL GOLDENROD® ELEMENTS - All NW models are available with the Goldenrod 24K gold plated element. Goldenrod Elements provide long-life and five times the scaling resistance of standard incoloy elements. Goldenrod Elements carry a three-year warranty against failure due to scale.
FUSING - Control and power circuit fusing to meet the National Electrical Code. 100,000 amp I.C. cartridge-type fuses protect all elements and contactors.
PILOT SWITCH AND LIGHT - Permits manual starting and stopping of heater by interrupting power to control circuit. Pilot light indicates when control circuit is energized.
MAGNETIC CONTACTORS - Heavy duty UL rated for 100,000 cycles.
LOW WATER CUTOFF - Probe type, electric low water cutoff prevent energizing of elements in the event of low water condition.
120 VOLT CONTROL CIRCUIT - Powered by fused transformer.
ASME CODE CONSTRUCTION - All vessels manufactured to applicable ASME Code. Vessels with maximum working pressure of 160 psi or less (standard design is for 125 psi) at 240°F maximum temperature bear the “H” symbol per Section IV of ASME Code. Vessels with greater
than 160 psi working pressure or higher than 240°F operating temperature will bear the “S” symbol per Section I of ASME Code.
UL LISTED - All boilers are UL listed per Underwriters’ Laboratories Standard No. 834.
ONE YEAR LIMITED WARRANTY
Θ For complete warranty information, consult written warranty.
OTHER STANDARD FEATURES
ΘTwo high temperature limit controls
ΘCabinet has a baked powder coat finish
ΘRectangular jacket made with 18 gauge (minimum) steel
Θ3” fiber glass insulation
ΘColor coded circuitry for easier servicing
ΘStandard voltages include 208, 240, 480 and 575 volt, single or three-phase
ΘFactory installed terminal block(s)
ΘCombination Temperature/Pressure Gauge
ΘBoiler drain valve
ΘCSA Certified and ASME Rated T&P Relief Valve
NW-37
through
NW-670
®
*Model shown with optional accessories
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Commercial Electric Hot Water Boilers
UL MINIMUM CLEARANCE REQUIRMENTS: 24” ALL SIDES, 12” TOP
NOTE: ALLOW 30” CLEARANCE FOR HINGED CONTROL
COMPARTMENT DOORS.
ELEMENTS CAN BE CHANGED WITH 24” CLEARANCE.
AN ADDITIONAL CONTROL PANEL IS REQUIRED ON
UNITS ABOVE 500kW RATED AT 208 OR 240 VOLTS.
MODELS: NW-37, NW-60, NW-96 AND NW-150
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MODELS: NW-220, NW-334, NW-400, NW-500 AND NW-670 |
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www.hotwater.com |
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