23 52 13_Rev1.pdf

CBP IDC-DLC SPECIFICATIONS

HARPERS FERRY, WV 09/21/22

SECTION 23 52 13

ELECTRIC BOILERS

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

ASME BPVC SEC IV (2017) BPVC Section IV-Rules for Construction of Heating Boilers

ASME CSD-1 (2016) Control and Safety Devices for Automatically Fired Boilers

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2020; ERTA 20-1 2020; ERTA 20-2 2020;

TIA 20-1; TIA 20-2; TIA 20-3; TIA 20-4)

National Electrical Code

UNDERWRITERS LABORATORIES (UL)

UL 834 (2004) Standard for Heating, Water Supply, and Power Boilers - Electric

1.2 GENERAL REQUIREMENTS

Extent of electric boiler work required by this Section is indicated on drawings and schedules, and by requirements of this Section. Types of electric boilers specified in this Section include electric resistance boilers.

Hot water boiler shall be designed for primary secondary configuration.

The boiler shall have its own constant flow recirculation pump. Refer to the schedules on the drawings and the control system "Sequence of Operation" for additional information.

Refer to other Division 23 Sections for concrete pads, piping, specialties, and pumps, required external to electric boilers for installation; not work of this Section. Refer to Division 26 Sections for field-installed electrical wiring required for electric boilers; not work of this Section.

Submit manufacturer's technical product data, including rated capacities of selected model clearly indicated, weights (shipping, installed and operating), dimensions, required clearances, furnished specialties and accessories; and installation and start-up instructions. For boilers with factory-mounted starters, provide short circuit current rating.

Submit manufacturer's assembly-type shop drawings indicating dimensions, weight loadings, required clearances, and methods of assembly of components.

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Submit ladder-type wiring diagrams for power and control wiring required for final installation of electric boilers and controls. Clearly differentiate between portions of wiring that are factory-installed and portions to be field- installed.

Submit maintenance data and parts list for each electric boiler, control, and accessory; including "trouble shooting" maintenance guide. Include this data and product data in maintenance manual; in accordance with requirements of Division 1.

1.3 QUALITY ASSURANCE

1.3.1 Manufacturer's Qualifications

Firms regularly engaged in manufacture of electric boilers, of types and capacities required, whose products have been in satisfactory use in similar service for not less than 5 years.

1.3.2 Codes and Standards

1.3.2.1 ASME Compliance

Construct electric boilers in accordance with ASME BPVC SEC IV for low pressure. Provide control and safety devices in compliance with locally adopted edition of ASME CSD-1.

1.3.2.2 NEC Compliance

Construct and install electric boilers in accordance with NFPA 70 National Electrical Code (NEC).

1.3.2.3 UL Compliance

Construct boilers, controls, and ancillary electrical equipment in accordance with UL 834. Provide electric boiler ancillary electrical components which are UL-listed and labeled.

1.4 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are or information only. When used, a code following the "G" classification identifies the office that will review the submittal for the Government.

Submit the following in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SD-02 Shop Drawings

Manufacturer's assembly-type shop drawings

Wiring Diagrams; G

SD-03 Product Data

Manufacturer's technical product data

SD-07 Certificates

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Certification Letter

Certification

SD-10 Operation and Maintenance Data

Maintenance data and parts list; G

1.5 WARRANTY

Furnish manufacturer's one-year warranty for each electric boiler including electrical control components, heating elements, and pressure vessels.

PART 2 PRODUCTS AND MATERIALS

2.1 Electric Resistance Boilers

Provide factory-assembled and tested electric resistance boilers as indicated. Provide capacities and electrical characteristics as scheduled.

2.1.1 Low-Pressure Vessels

Construct of carbon steel, in accordance with ASME BPVC SEC IV, for working pressure as scheduled. Provide ASME stamp, and register with National Board of Boiler and Pressure Vessel Inspectors. Furnish ASME data reports.

2.1.2 Base and Lifting Lugs

Mount pressure vessel on 4" steel channel frame base. Provide lifting lugs welded to pressure vessel, and extending above top of jacket.

2.1.3 Nozzles

Provide flanges for hot-water inlet and outlet, and heating element inserts. Provide threaded connections for water relief valve and boiler drain.

2.1.4 Insulations

Provide minimum R-9.0 insulation covering entire surface of pressure vessel.

2.1.5 Jacket

Provide steel jacket around boiler with removable side panels for access to pressure vessel, and knockouts for electrical conduit and mechanical piping. Provide baked enamel finish, manufacturer's standard color.

2.1.6 Heating Elements

Provide replaceable incoloy sheathed heating elements, each rated at 15 KW maximum, of sufficient length to limit heat transfer to 75 W/sq. in.

maximum. Subdivide load branch circuits into 48 amperes maximum each.

Wire elements with UL-listed conductors.

2.1.7 Power Panels

Provide NEMA 1 ventilated power panel with hinged door and key locking handle. Provide mechanical lugs bolted to copper bus bars. Provide NEMA Class J or K5, maximum 60 amperes fuses. Provide 3-pole magnetic

SECTION 23 52 13 Page 3 contactors, listed by UL for 100,00 cycles at full load, with full-voltage coil, subject to local code requirements. Wire in accordance with UL 834.

2.1.8 Boiler Trim

Provide pressure-temperature gauge, ASME certified relief valve, drain valve, manual reset low-water cutoff, and dual automatic reset high-temperature cutouts.

2.1.9 Boiler Control

Provide controller with boiler capable of maintaining leaving water temperature. Control of the boiler plant shall be by the Building Automation System as indicated in Section 23 09 23.02 BACNET DIRECT DIGITAL

CONTROL FOR HVAC AND OTHER BUILDING CONTROL SYSTEMS.

2.1.10 Accessories

a. Manual reset high limit control.

b. Nonfused interlocking disconnect switch.

c. Flow Switch: Furnish field-mounted differential pressure sensor or thermal dispersion flow switch (paddle-type flow switch not allowed).

PART 3 EXECUTION

3.1 INSTALLATION

Install boilers in accordance with manufacturer's installation instructions, in accordance with State and local code requirements, and in accordance with requirements of local utility company. Install units plumb and level, to tolerance of 1/8" in 10' in both directions. Maintain manufacturer's recommended clearances around and over boilers.

3.1.1 Support

Install electric resistance boilers on concrete equipment pad 4" larger on each side than base of unit.

3.1.2 Erection

Assemble boiler trim which has been shipped loose, or unassembled for shipment purposes.

3.1.3 Hot Water Piping

Refer to Section 23 64 26 CHILLED, CHILLED-HOT, AND CONDENSER WATER PIPING SYSTEMS. Connect hot water piping, drain piping, and relief valve relief piping.

3.1.4 Electrical Work

Install electrical devices furnished by manufacturer, but not specified to be factory mounted. Furnish copy of manufacturer's wiring diagram submittal to Electrical Installer.

Verify that electrical work is in accordance with manufacturer's submittal and installation requirements of Division 26 Sections. Do not proceed with

SECTION 23 52 13 Page 4 equipment start-up until electrical work is acceptable to equipment Installer.

3.2 CLEANING AND TOUCH-UP PAINTING

3.2.1 Cleaning

Flush and clean boilers upon completion of installation, in accordance with manufacturer's start-up instructions. Just prior to substantial completion, clean unit's exposed surfaces.

3.2.2 Touch-up Painting

Retouch any marred or scratched surfaces of factory-finished surfaces, using finish materials furnished by manufacturer.

3.3 FIELD QUALITY CONTROL

3.3.1 Start-up and Testing

Flush and clean electric boilers upon completion of installation, in accordance with manufacturer's start-up instructions.

Start-up electric boilers, in accordance with manufacturer's start-up instructions, and in presence of boiler manufacturer's representative.

Test controls and demonstrate compliance with requirements. Replace damaged or malfunctioning controls and equipment.

3.4 TRAINING

At a time mutually agreed upon between the Owner and Contractor, provide the services of a factory trained and authorized representative to train Owner's designated personnel for a minimum of four hours on the operation and maintenance of the equipment provided under this section.

3.4.1 Content

Training shall include but not be limited to:

a. Overview of the system and/or equipment as it relates to the facility as a whole.

b. Operation and maintenance procedures and schedules related to startup and shutdown, troubleshooting, servicing, preventive maintenance and appropriate operator intervention.

c. Review data included in the operation and maintenance manuals.

Refer to Section 01 78 23 OPERATION AND MAINTENANCE DATA.

3.4.2 Certification

Contractor shall submit to the Engineer a certification letter stating that the Owner's designated representative has been trained as specified herein.

Letter shall include date, time, attendees and subject of training. The certification letter shall be signed by the Contractor and the Owner's representative indicating agreement that the training has been provided.

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3.4.3 Schedule

Schedule training with Owner with at least 7 days' advance notice.

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