238200 - CONVECTION HEATING AND COOLING UNITS.pdf

Renovation of Historical Building 4

Project #565 20 101

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CONVECTION HEATING AND COOLING UNITS

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SECTION 23 82 00

CONVECTION HEATING AND COOLING UNITS

PART 1 - GENERAL

1.1 DESCRIPTION

This section specifies unit heaters.

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS.

B. Section 01 09 00, GENERAL COMMISSIONING REQUIREMENTS

C. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES

D. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL

COMPONENTS: Seismic restraints for equipment.

E. Section 23 05 11, COMMON WORK RESULTS FOR HVAC: General mechanical requirements and items, which are common to more than one section of

Division 23.

F. Section 23 05 41, NOISE and VIBRATION CONTROL FOR HVAC PIPING and

EQUIPMENT: Noise requirements.

G. Section 23 05 93, TESTING, ADJUSTING, and BALANCING FOR HVAC: Flow rates adjusting and balancing.

H. Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS: Requirements for commissioning, systems readiness checklists, and training.

I. Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC: Valve operators.

J. Section 23 31 00, HVAC DUCTS and CASINGS: Ducts and flexible connectors.

K. Section 23 82 16, AIR COILS: Additional coil requirements.

1.3 QUALITY ASSURANCE

Refer to Paragraph, QUALITY ASSURANCE, in Section 23 05 11, COMMON WORK

RESULTS FOR HVAC. Provide guarantee in accordance with FAR clause

52.246-21

1.4 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT

DATA, and SAMPLES.

B. Manufacturer's Literature and Data:

1. Unit heaters.

2. Wall Mounted Unit Heaters.

C. Certificates:

1. Compliance with Article, QUALITY ASSURANCE.

2. Compliance with specified standards.

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D. Operation and Maintenance Manuals: Submit in accordance with Article, INSTRUCTIONS, in Section 01 00 00, GENERAL REQUIREMENTS.

E. Completed System Readiness Checklists provided by the Commissioning

Agent and completed by the contractor, signed by a qualified technician and dated on the date of completion, in accordance with the requirements of Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS.

1.5 APPLICABLE PUBLICATIONS

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

B. American National Standards Institute / Air Conditioning, Heating and

Refrigeration Institute (ANSI/AHRI):

440-2019................Performance Rating of Room Fan Coils

National Fire Protection Association (NFPA):

90A-2018................Standard for the Installation of Air

Conditioning and Ventilating Systems

70-2017.................National Electrical Code

C. Underwriters Laboratories, Inc. (UL):

181-2013................Standard for Factory-Made Air Ducts and Air

Connectors

1995-2015...............Heating and Cooling Equipment

PART 2 - PRODUCTS

2.1 UNIT HEATERS

A. General: Horizontal or vertical discharge type for electric heating medium, as indicated.

B. Casing: Steel sheet, phosphatized to resist rust and finished in baked enamel. Provide hanger supports.

C. Fan: Propeller type, direct driven by manufacturer's standard electric motor. Provide resilient mounting. Provide fan guard for horizontal discharge units.

D. Discharge Air Control:

1. Horizontal discharge: Horizontal, adjustable louvers.

2. Vertical discharge: Radial louver diffuser.

E. Electric Units: UL listed, factory wired to terminal strips for field connection of power and control wiring.

1. Heating elements: Nickel chromium alloy resistance wire embedded in a magnesium oxide insulating refractory and sealed in corrosion

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CONVECTION HEATING AND COOLING UNITS

23 82 00 - 3 resisting metallic sheath with fins. Three phase heaters shall have balanced phases.

2. Thermal cutout: Manual reset type, which disconnects elements, and motor in the event normal operating temperatures are exceeded.

3. Magnetic contactor: Factory installed with low voltage relay for remote pilot duty thermostat operation.

F. Controls: Provide field installed remote wall mounted line voltage electric space thermostats to control the unit fan.

2.2 WALL-MOUNTED UNIT HEATERS

A. General: Electric heat, fan driven, thermostatic control, UL listed.

B. Enclosure:

1. Wall box: Not less than 1.3 mm (l8 gage) steel, recessed type.

2. Ribbed 1.6 mm (l6 gage) steel front cover.

3. Closely spaced discharge louvers.

4. Concealed screws for locking trim frame to front cover.

5. Finished in baked enamel of manufacturer’s standard color with satin finish anodized aluminum trim frame.

C. Heating Elements: Steel sheath enclosed finned-tube type.

D. Integral Controls:

l. Two-pole terminal block.

2. Built-in fan delay switch.

3. Automatic reset line voltage internal thermal overheats protection.

4. Built-in thermostat comfort control with adjustment range between -1 to 32 degree C (30-90 degrees F), and manually set "No Heat" position; tamper resistant adjustment by inserting screwdriver through front cover louvers.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Work shall be installed as shown and according to the manufacturer’s diagrams and recommendations.

B. Handle and install units in accordance with manufacturer's written instructions.

C. Support units rigidly so they always remain stationary. Cross-bracing or other means of stiffening shall be provided as necessary. Method of support shall be such that distortion and malfunction of units cannot occur.

D. Install fiberglass blanket insulation with a minimum R value of 8 above hydronic radiant panels.

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3.2 OPERATIONAL TEST

Refer to Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

3.3 STARTUP AND TESTING

A. The Commissioning Agent will observe startup and contractor testing of selected equipment. Coordinate the startup and contractor testing schedules with the COR and Commissioning Agent. Provide a minimum of 7 calendar days prior notice.

3.4 COMMISSIONING

A. Provide commissioning documentation in accordance with the requirements of Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS for all inspection, start up, and contractor testing required above and required by the

System Readiness Checklist provided by the Commissioning Agent.

B. Components provided under this section of the specification will be tested as part of a larger system. Refer to Section 23 08 00 –

COMMISSIONING OF HVAC SYSTEMS and related sections for contractor responsibilities for system commissioning.

3.5 DEMONSTRATION AND TRAINING

A. Provide services of manufacturer’s technical representative for four hours to instruct VA personnel in operation and maintenance of units.

B. Submit training plans and instructor qualifications in accordance with the requirements of Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS.

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