EB-NB Installation Manual

12/28/2018 BI804
Industrial Series
Electric Hot Water Boiler
EB-NB Series
Installation & Operating Manual
See page 1 Specification Chart for specific model by voltage and kW size.
Evaluate utility service/utility transformer feed. EB-NB series boilers are manufactured to utilize either of
the two common 3-phase electrical feeds.
3-Phase Y, with neutral and ground – The internal wiring configuration of the EB-NB boiler does not
require a neutral. This unit is manufactured and shipped without ground fault protection. Certain state
and local codes may require the addition of ground fault protection. Be certain to research and follow
these codes.
3-Phase Delta, no neutral, dedicated service from the transformer with unbonded neutral – Theoretically,
the element life is increased with a 3-wire Delta service. A ground fault protection kit must be added to in
this instance. The addition of this kit to the EB-NB brings the boiler into “NEC Article 250.21, unbonded
neutral” compliance. This kit may be installed at our factory upon your request. In addition to the CSA
product certification, this safety control system is approved by Minnesota, North Dakota, and the South
Dakota State Boards of Electricity.
Safety grounding – a single point grounding electrode system must be established for the facility for either the
Y or Delta feeds. All points including utility transformer, service entrance, Electro-Boiler utility transformer,
building service entrance ground lug, etc. must be bonded to the same facility grounding electrode system.
Application – retrofit, dual boiler – see drawing BX803 for suggested minimum valving, controls included for
switchover from remote utility device or outdoor temp.
 New installation or replacement – sized for full load capacity, internal controls have backup
troubleshooting features for emergency heating.
Vessel – designed and fabricated to comply with ASME Section IV, with “H” Stamp and National Board of
Boiler and Pressure Vessel Registration, with a maximum working pressure of either 30 psi or 125 psi (design
pressure specified when placing order).
Heating elements – removable, low-watt density, Incoloy sheathed, top vessel plate screw-in element. Access
is made easy via top split enclosure top cover.
Piping – 3” NPT top supply, 3” NPT left side return, 3” left side inspection plug, 1” left side bottom drain, 1”
top vessel location for pressure relief and/or air relief. All system piping and pumps must be large enough to
meet the required GPM flow shown on page 1 for the vessel size.
Limited Warranty Statement – see document XX024 included in this installation manual.