[اسلام زغلول]

WATER HEATERS

PART 1 – GENERAL

1.1 RELATED DOCUMENTS

1.1.1 Drawings and general provisions of Contract, including General and Supplementary Conditions and Division I Specification Sections, apply to this Section.

1.2 SUMMARY

1.2.1 This Section includes commercial electric water heater ratings as indicated in the drawing and equipment schedule.

1.2.2 Related Sections: The following Sections contain requirements that relate to this
Section:

1. Division 3 Sections “Structural Concrete Formwork” and “Concrete Reinforcement” for formwork, reinforcement, and concrete for concrete bases.
2. See relevant Mechanical specification and drawings for water piping connections to water heaters, hot water circulator pumps and distribution piping plans.

1.3 SUBMITTAIS

1.3.1 General: Submit the following in accordance with Conditions of Contract and Division I Specification Sections.

1.3.2 Product data including rated capacities of selected models, weights (shipping, installed, and operating), furnished specialties, and accessories, and indicating dimensions, required clearances, and methods of assembly of components, and piping and wiring connections.

1.3.3 Wiring diagrams from manufacturers detailing electrical requirements for electrical power supply wiring to water heaters. Include ladder-type wiring diagrams for interlock and control wiring required for final installation of water heaters and controls. Differentiate between portions of wiring that are factory installed and portions that are to be field installed.

1.4 QUALITY ASSURANCE

1.4.1 UL Standards: Provide water heaters complying with the following:

1. UL 1453, “Electric Booster and Commercial Storage Tank Water Heaters”.

1.4.2 Electrical Component Standard: Provide components complying with NFPA 70 “National Electrical Code”.

1.4.3 Listing and Labeling: Provide water heaters that are listed and labeled. The terms “listed” and “labeled” shall be as defined in the National Electrical Code, Article 100.

1.4.4. ASME Code Compliance: Provide water heaters and safety relief valves that comply with ASME Boiler and Pressure Vessel Code.

1.4.5 ASHRAE Standards: Provide water heaters with performance efficiencies not less than prescribed in ASHRAE 90A, “Energy Conservation in New Building Design”.

1.5 WARRANTY

1.5.1 Special Project Warranty: Submit a written warranty, executed by manufacturer, agreeing to repair or replace water heater units that fail in materials or workmanship within the specified warranty period. Failures include, but are not limited to, tanks, coils, heat exchangers, and burners. This warranty shall be in addition to, and not a limitation of, other rights the Owner may have against the Contractor under the Contract Documents.

PART 2- PRODUCTS

2.4 ELECTRIC WATER HEATER. Provision of control & monitor in the BMS as per drawing.

2.4.1 Description: Automatic, commercial, electric; with vertical, 1035 kPa (150 psig) rated storage tank, integral controls, drain valve, and relief valve. Electric water heaters shall be UL listed.

2.4.3 Insulation: Fiberglass or polyurethane foam, surrounding tank.

2.4.4 Jacket: Steel, with baked-on enamel finish.

2.4.5 Tank: Glass-lined steel with anode rods and drain valve.

2.4.6 Heating Elements: Screw-in or flanged bolt-in immersion type, in multiples of 3 elements.

2.4.7 Controls: Adjustable immersion thermostat.

2.4.8 Safety Controls: Automatic, high-temperature-limit cutoff and low-water cutoff

2.4.9 Temperature and Pressure Relief Valve: ASME rated and labeled.

2.4.10 Vacuum Relief Valve: ANSI Z2 1.22.

2.4.11 Storage Capacity: Refer to equipment schedules
Electric Input: Refer to equipment schedules

2.4.14 Electrical Characteristics: 3 phase, to suit available electrical current.

2.5 CONCRETE BASES

2.5.1 Concrete: Portland cement, mix to a 27,500 kPa (4000 psi), 28 day compressive strength.

1. Cement: ASTMC 150, Type l.
2. Fine Aggregate: ASTM C 33, sand.
3. Coarse Aggregate: ASTM C 33, crushed gravel.

2.5.2 Reinforcement Fabric: ASTM A 185, welded wire fabric, plain.

2.5.3 Reinforcement Bars: ASTM A 615, Grade 60, deformed.

PART 3 - EXECUTION

3.1 CONCRETE BASES

3.1.1 Construct concrete equipment bases of dimensions indicated.

3.1.2 Form concrete bases having permanent steel frame, using steel channels conforming to ASTM A 36, size and location as indicated. Miter and weld corners and provide cross bracing. Anchor or key to floor slab.

3.1.3 Install reinforcing bars, tied to frame, and place anchor bolts and sleeves using manufacturer’s installation template.

3.1.4 Form concrete bases using framing lumber with form release compounds. Chamfer top edges and corners.

3.1.5 Install reinforcing bars, and place anchor bolts and sleeves using manufacturer’s installation template.

3.1.6 Place concrete and allow to cure before installation of equipment.

3.1.7 Clean exposed steel frames and apply 2 coats of rust-preventative metal primer and 2 coats of exterior, gloss, alkyd enamel in color selected by the Engineer.

3.2 WATER HEATER INSTALLATION

3.2.1 General: Install water heaters on concrete bases. Set and connect units in accordance with manufacturer’s written installation instructions. Install units plumb and level, firmly anchored in locations indicated, and maintain manufacturer’s recommended clearances. Orient so controls and devices needing servicing are accessible.

3.2.2 Install thermometers on water heater inlet and outlet piping. Thermometers are specified in Division is Section “Meters and Gages”.

3.3 CONNECTIONS

3.3.1 Piping installation requirements are specified in other Sections of Division 15. The Drawings indicate general arrangement of piping, fittings, and specialties. The following are specific connection requirements:

1. Install piping adjacent to equipment arranged to allow servicing and maintenance.

2. Connect hot and cold water piping to units with shutoff valves and unions. Connect hot water circulating piping to unit with shutoff valve, check valve, and union. Extend relief valve discharge to closest floor drain.

a. Where water heater piping connections are dissimilar metals, make connections with dielectric unions specified in Division 15 Section “Plumbing”.

b. Install vacuum relief valve in cold water inlet piping.

3. Install drain as indirect waste to spill into open drain or over floor drain.

a. Install drain valve at low point in water piping, for water heaters not having tank drain.

3.3.2 Electrical Connections: Power wiring and disconnect switches are specified in Division 16.

1. Grounding: Connect unit components to ground in accordance with the National Electrical Code.

3.4 FIELD QUALITY CONTROL

3.4.1 General: Provide the services of supplier’s service representative to test and inspect unit installation, provide start-up service, and demonstrate and train Owner’s maintenance personnel as specified below.

1. Test and adjust operating and safety controls. Replace damaged and malfunctioning controls and equipment.

3.4.2 Train Owner’s maintenance personnel on procedures and schedules related to start-up and shutdown, troubleshooting, servicing, and preventative maintenance.

1. Review data in Operating and Maintenance Manuals.
2. Schedule training with at least 7 days, advance notice.

3.5 COMMISSIONING

3.5.1 Perform the following before start-up final checks:

1. Fill water heaters with water.
2. Piping systems test complete.
3. Check for piping connections leaks.
4. Test operation of safety controls and devices.

3.5.2 Perform the following start-up procedures:

1. Energize circuits.

2. Adjust operating controls.

3. Adjust hot water outlet temperature setting.





End of Section

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