EBW-SPEC-02
Typical Specification for Lochinvar®Commercial Electric Hot Water Boiler
The ELECTRIC HOT WATER BOILER shall be a Lochinvar Commercial Electric Hot Water Boiler, Model
BW __(16, 20, 24, 30, 36, 42, 48)-______, rated at ______kW, for a balanced 3-phase, 3-wire delta load at ______volts, 3 phase, _____Hertz. The Boiler shall be designed for a ______GPM flow with a discharge temperature of ______°F and entering water at ______°F. The Hot Water Boiler shall be available with electrical inputs from 440 kW up to 3600 kW. Boiler shall be designed for a low pressure heating system with an operating pressure at ______pounds per square inch.
The boiler vessel shall be constructed in accordance with Section IV of the ASME Boiler and Pressure Vessel Code requirements, “H” stamped and registered with the National Board of Boiler and Pressure Vessels. The vessel shall be equipped with (threaded) (flanged) ______inch inlet and outlet connections, safety valve and drain nozzle connections as required (threaded connection available only on BW*16** models, all other models use flanged connections). All plumbing connections shall be of extra heavy pipe.
The vessel shall be enclosed in a rectangular 16-gauge jacket and be completely insulated with a 3” blanket of fiberglass insulation. The jacket assembly shall include a full sized electrical control panel separated by an air gap. A 2” minimum gap shall be provided between the vessel and electrical panel to keep components and controls at a reduced ambient temperature for extended service life. The electrical control panel shall have two full-length hinged doors with key locks for access to heating elements and controls. The assembled electric boiler jacket and control panel shall have an acrylic enamel finish. The assembled boiler shall have a common structural steel channel base supporting both the electrical panel enclosure and vessel jacket. The steel base allows ease of installation and provides proper support as a permanent base.
Electrical entrance shall be made through the top of the electrical control panel. All field electrical wiring connections to the boiler shall be made to a main terminal block(s). There shall be ______main terminal block(s) with ______wires per phase per entrance. All internal wiring shall be made to solderless terminal lug wiring connections. Wiring to be color coded or numbered for ease of servicing. All power circuits to heating elements shall be fused with cartridge type fuses having a minimum 100,000 amp interrupting capacity. Operation of the heating elements shall be switched by three pole magnetic contactors operated by a 120 volt control circuit. The control circuit shall use a built-in transformer to reduce line voltage to 120 volts for operation of the control circuit components. The control circuit shall be fused on the primary side as well as fused and grounded on the secondary side.
Temperature control shall be with a proportional solid state step control to balance heat input to demand. The step control shall provide ______steps of load. The step control shall have an adjustable water temperature set point and throttling range. The hot water boiler shall be provided with an adjustable auto reset high limit control and an additional manual reset high limit control.
The immersion heating elements shall be low watt density with an incoly outer sheath material for long life. Each heating element shall be sized at a maximum of 75 watts per square inch of heating surface. The heating elements shall be a three beam design and mount in individual tank flanges. Each heating element shall not exceed 18 kW of input per flanged connection.
The electric hot water boiler shall be a complete factory package with the following trim furnished as standard: On-Off pilot switch with pilot light to manually operate the 120 volt control circuit, status pilot light for each stage of operation, preheat switch with pilot light on units above 240 kW, probe type electronic low water cut-off, pressure gauge with cock, temperature indicator, drain valve and an ASME rated pressure relief valve(s). The boiler shall be factory assembled, wired and tested. The entire hot water boiler shall be U.L. Listed and provide a 3 year limited warranty on the vessel and a 1 year limited warranty on parts.
OPTIONAL CONTROLS: (Commercial Models):
Main Power Disconnect, Fused Disconnect or Automatic Breaker, Ground Fault Detector, Low Temperature Switch, Alarm Bell, Manual Limiting Switches per Step, Flow Switch, Ammeter, Voltmeter, Watt-hour Meter, Time Clock, Safety Door Interlock, High / Low Pressure Switches, Dial Temperature Gauge, Dial Pressure Gauge, Auxiliary Low Water Cut-off (float or probe type), Manual Reset Low Water Cut-off, Auto Air Vent Installed, Vacuum Breaker Installed.
12/03 – Printed in U.S.A.