10. HVAC AIR DISTRIBUTION REV1.pdf

QUUG 23-1001. EDI RPR/ADD RADR VEHICLE MX, B121

SECTION 23 30 00 - 1

SECTION 23 30 00

HVAC AIR DISTRIBUTION

1 GENERAL

1.1 REFERENCES

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

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2023) National Electrical Code

ASOCIACIÓN ESPAÑOLA DE NORMALIZACIÓN Y CERTIFICACIÓN (AENOR)

UNE-EN 1505 (1999) Ventilation for buildings - Sheet metal air ducts and fittings with rectangular cross section - Dimensions

UNE-EN 1506 (2007) Ventilation for buildings - Sheet metal air ducts and fittings with circular cross-section - Dimensions

UNE-EN 1507 (2007) Ventilation for buildings - Sheet metal air ducts with rectangular section - Requirements for strength and leakage

UNE-EN 12237 (2003) Ventilation for buildings. Ductwork. Strenght and leakage of circular sheet metal ducts.

UNE-EN 15727 (2010) Ventilation for buildings - Ducts and ductwork components, leakage classification and testing

UNE-EN 13501-1 (2019) Fire classification of construction products and building elements - Part 1:

Classification using data from reaction to fire tests

UNE-EN 15715 (2012) Thermal insulation products - Instructions for mounting and fixing for reaction to fire testing - Factory made products

UNE-EN 13180 (2003) Ventilation for buildings - Ductwork - Dimensions and mechanical requirements for flexible ducts

1.2 SUBMITTALS

Submit the following:

- Shop Drawings

a. Detail Drawings;

Submit detail drawings showing equipment layout, including assembly and installation details and electrical connection diagrams; ductwork layout showing the location of all supports and hangers, typical hanger details, gauge reinforcement, reinforcement spacing rigidity classification, and static pressure and seal classifications.

- Catalog Data

a. Metal Ductwork;

b. Flexible Duct;

c. General Service Flexible Duct Connectors;

d. Duct Access Doors;

SECTION 23 30 00 - 2

e. Manual Balancing Dampers;

f. Constant Flow Control Damper;

g. Supply Diffusers;

h. Return Registers;

i. Outside Air Louvers;

j. In-Line Fans;

k. Centrifugal Cabinet Fans;

l. Single Inlet Centrifugal Fan;

m. Thermostat;

n. Time Clocks;

o. Chiller unit and accessories.

- Operating Instructions

a. Constant Flow Control Damper;

b. In-Line Fans;

c. Centrifugal Cabinet Fans;

d. Single Inlet Centrifugal Fan;

e. Thermostat;

f. Time Clocks;

g. Operation and Maintenance Manuals;

- Test Reports

a. Ductwork Leak Test;

1.3 SYSTEM DESCRIPTION

Furnish ductwork, piping offsets, fittings, and accessories as required to provide a complete installation. Coordinate the work of the different trades to avoid interference between piping, equipment, structural, and electrical work. Provide complete, in place, all necessary offsets in piping and ductwork, and all fittings, and other components, required to install the work as indicated and specified.

1.4 QUALITY ASSURANCE

Except as otherwise specified, approval of materials and equipment is based on manufacturer's published data.

1.4.1 Detail Drawings

Submit detail drawings showing equipment layout, including assembly and installation details and electrical connection diagrams; ductwork layout showing the location of all supports, gauge reinforcement, reinforcement, spacing rigidity classification, and static pressure and seal classifications.

SECTION 23 30 00 - 3

1.4.2 Test Procedures

Conduct performance tests as required in Section 23 05 93 “TESTING, ADJUSTING AND

BALANCING FOR HVAC”.

2 MATERIALS AND EQUIPMENT

2.1 IDENTIFICATION PLATES

In addition to standard manufacturer's identification plates, provide engraved laminated phenolic identification plates for each piece of mechanical equipment. Identification plates are to designate the function of the equipment. Provide identification plates that are layers, black-white-black, engraved to show white letters on black background. Letters must be upper case.

2.2 PAINTING

Factory painted equipment units in accordance with the equipment manufacturer's approved standards, unless otherwise specified.

2.3 DUCT SYSTEM

2.3.1 Metal Ductwork

Provide metal ductwork construction, including all fittings and components, that complies with UNE- EN 1505 and/or UNE-EN 1506, as supplemented and modified by this specification.

Minimum 0.6 mm thick galvanized sheet metal and Metu flanged transverse joints sealed with high temperature resistant mastic. The thickness of the sheet metal shall be adequate to ensure structural integrity and avoid deformation due to air pressure, depending on the dimensions of the duct.

Provide radius type elbows with a centerline radius of 1.5 times the width or diameter of the duct where space permits. Otherwise, elbows having a minimum radius equal to the width or diameter of the duct or square elbows with factory fabricated turning vanes are allowed.

Ductwork shall have a sealing corresponding to class ATC 4 or higher.

2.3.2 Flexible Duct

Flexible air distribution ducts for air conditioning with factory-applied insulation, vapor barrier, and end connections, consisting of an inner duct of a polyester-aluminum complex with helical spiral wire reinforcement treated against oxidation, 20 mm thick glass wool felt insulation and an outer lining of a reinforced polyester-aluminum complex.

Thermal conductivity 0.035 W/m·K, reaction to fire Euroclass B-s1, d0 according to UNE-EN 13501- 1 and UNE-EN 15715. Maximum working pressure 2500 Pa according to UNE-EN 13180.

The length of each flexible connection shall not exceed 1.5 m.

2.3.3 General Service Flexible Duct Connectors

Provide a flexible duct connector approximately 150 mm in width where sheet metal connections are made to mechanical equipment. Install the flexible material locked to metal collars using normal duct construction methods. Provide fabric of the flame-retardent type.

Install at the inlet and outlet connection of all mechanical equipment that can transfer its vibrations to the duct system.

SECTION 23 30 00 - 4

2.3.4 Duct Access Doors

Provide hinged access doors in ductwork and plenums where indicated and at all air flow measuring primaries, automatic dampers, fire dampers, coils, thermostats, and other apparatus requiring service and inspection in the duct system. Provide access doors upstream and downstream of air flow measuring primaries and heating and cooling coils. Provide doors that are a minimum 375 by 450 mm, unless otherwise shown.

Where duct size does not accommodate this size door, make the doors as large as practicable.

2.3.5 Manual Balancing Dampers

Rectangular multileaf dampers for volume flow and pressure control as well as for shutting off ducts and openings in walls and ceiling slabs. Aerofoil opposed action blades. Ready-to-operate unit which consists of the casing, aerofoil blades and the blade mechanism. Flanges on both sides, suitable for duct connection.

Casing and blades made of extruded aluminium sections. Shafts, bearing plate and position indicator made of galvanised steel.

Furnish manual balancing dampers with accessible operating mechanisms. Provide access doors or panels for all concealed damper operators and locking setscrews. Provide access doors or panels in hard ceilings, partitions and walls for access to all concealed damper operators and damper locking setscrews.

Coordinate location of doors or panels with other affected contractors.

Provide stand-off mounting brackets, bases, or adapters not less than the thickness of the insulation when the locking-type quadrant operators for dampers are installed on ducts to be thermally insulated, to provide clearance between the duct surface and the operator. Provide stand-off mounting items that are integral with the operator or standard accessory of the damper manufacturer.

2.3.6 Constant Flow Control Damper

Provide circular constant air volume damper to facilitate balancing of ventilation systems. Diameter as indicated on drawings. Constructed from galvanized steel or ABS AF312A-class plastic material with flammability V0 and tightness joint from rubber. Airtight casing according to EN-1751 standard. Auto-mechanical, with no need for outside power. Flow rate of 4:1. With an adjustment device to manually adjust the factory-set air volume flow on site.

2.4 DIFFUSERS, REGISTERS, AND GRILLES

Provide factory-fabricated units of aluminum that distribute the specified quantity of air evenly over space intended without causing noticeable drafts, air movement faster than 0.25 m/s in occupied zone, or dead spots anywhere in the conditioned area.

Provide all units with volume damper with accessible operator, unless otherwise indicated. Provide opposed blade type volume dampers for all diffusers and registers.

2.4.1 Swirl Diffuser

Provide swirl diffusers with individually oriented louvers and airfoil profile with a dimension of 595x595 mm tile, to be installed in modular suspended ceilings, with side plenum box made of galvanized steel sheet, internally insulated, with regulating damper at the inlet. Manufactured entirely in steel sheet.

Finished in white RAL 9010.

Size as shown in drawings.

SECTION 23 30 00 - 5

2.4.2 Return Registers

Provide return registers that are the fixed horizontal or vertical louver type. Provide rectangular units, size as indicated on drawings.

For administrative occupancies, provide return grilles, with inclined horizontal blades of extruded aluminum, painted in the color of the ceiling, with flow regulation mechanism operable from the front, prepared for direct mounting on the support profiles of the suspended ceiling, mounted in the suspended ceiling.

For industrial occupancies, provide return grilles, made of galvanized steel profiled sheet, with individually adjustable horizontal blades, with flow regulation mechanism that can be operated from the front, fastened with visible screws, mounted in rectangular metal duct.

Furnish registers with sponge-rubber gasket between flanges and support base surface.

2.5 OUTSIDE AIR LOUVERS

Provide louvers for outdoor air intake, with bird-proof metal mesh (12.5 mm standard mesh). Designed to prevent ingress of rainwater, snow, etc, with bird-proof mesh. Manufactured in extruded aluminum, colour finish to match the wall. Provide louvers with mounting frame appropriate for the intended use. Prepared for assembly together with low-leakage damper.

Furnish louvers with sponge-rubber gasket between flanges and support base surface. Locate louvers at least 3.0 m above the ground level.

2.6 AIR SYSTEMS EQUIPMENT

2.6.1 In-Line Fans (Restrooms ventilation)

Provide in-line fans with removable covers and with ball bearings. Casing made of self-extinguishing V0 plastic material. Motors with long life ball bearings. IPX4 protection. Two-speed and adjustable.

The characteristics of every centrifugal fan are as follows:

EF05 & EF06

Fow: 324 m³/h

Pressure drop: 62 Pa

Voltage: 110-120 V

Phasea: 1

Frequency: 60 Hz

2.6.2 Centrifugal Cabinet Fans (Workshop General Ventilation)

Provide centrifugal cabinet fans, belt driven ventilation units with backward curved impeller, acoustic insulation, galvanised sheet steel finish.

Fans in galvanised steel sheet casing, backward curved impeller made of painted sheet steel and glands for cable entry.

Motors with IE3 efficiency, class F, with ball bearings and IP55 protection.

Working temperature -25 ºC +50 ºC. Galvanised sheet steel with thermal and acoustic insulation finish.

SECTION 23 30 00 - 6

Provide centrifugal cabinet fans capable of overcoming the pressure drop and flow rates required in drawings.

The characteristics of every centrifugal fan are as follows:

(1) EF01 & EF02

Fow: 9735 m³/h

Pressure drop: 235 Pa

Voltage: 208 V

Phases: 3

Frequency: 60 Hz

(2) EF03

Fow: 200 m³/h

Pressure drop: 57 Pa

Voltage: 208 V

Phases: 3

Frequency: 60 Hz

(3) EF04

Fow: 722 m³/h

Pressure drop: 190 Pa

Voltage: 208 V

Phases: 3

Frequency: 60 Hz

2.6.3 Axial Fans (Bathroom and Mechanical room ventilation)

Provide wall mounted axial fans.

The characteristics of every centrifugal fan are as follows:

(1) EF07

Fitted with an aluminium impeller.

Motors with IE3 efficiency

Class F motors with ball bearings. IP55 protection

Finish: Anti-corrosive finish in polyester resin, polymerised at 190 ºC, after degreasing with phosphate-free nanotechnology treatment.

Fow: 8500 m³/h

Voltage: 208 V

Phases: 3

Frequency: 60 Hz

SECTION 23 30 00 - 7

(2) EF08

Voltage: 110-120 V

Phases: 1

Frequency: 60 Hz

2.6.4 Single Inlet Centrifugal Fan (Local exhaust system)

Provide single inlet centrifugal fans that are specially designed to remove vehicle exhaust gases, designed for mounting to extraction arms and rated for outdoor use.

Provide single inlet centrifugal fans as follows:

Physical dimensions and properties

Material:

impeller housing aluminium powder coated galvanized sheet metal

Color of housing basalt grey (RAL 7011)

Motor design NEMA

Fan type centrifugal

Impeller backward inclined

Design conditions 68°F (20°C) at sea level

Max. airflow temperature 176°F (80°C) continuously

Performance

Max. starts/stops per hour 20

Ambient conditions

Operating temperature:

min.

nom.

max.

-4°F (-20°C) 68°F (20°C) 176°F (80°C)

Max. relative humidity 80%

Voltage 1208

Phase 3

Frequency 60 Hz

Provide single inlet centrifugal fans capable of overcoming the pressure drop and flow rates required in drawings.

2.7 ROOM FAN-COIL UNITS

Provide base units that include galvanized coil casing, coil assembly drain pan, air filter, fans, motor, fan drive, motor switch, an enclosure for cabinet models and casing for concealed models, leveling devices integral with the unit for vertical type units, and sound power levels as indicated. Fasten each unit securely to the building structure. Provide units with capacity indicated.

Provide 2-pipes, room fan-coil units as follows:

Air Flow m³/h Max. 760

Med. 640

SECTION 23 30 00 - 8

Min. 500

Total Cooling Capacity

W Max. 3287

Med. 3019

Min. 2654

Sensible Cooling Capacity

W Max. 2434

Med. 2220

Min. 1938

Heating Capacity W Max. 4108

Med. 3720

Min. 3205

Water Flow and Pressure Losses

L/h 522 m.c.a Cooling 1.8

Heating 1.7

Voltage 110-115V

Phase 1

Frequency 60 Hz

Provide units to be mounted inside the suspended ceiling and with vertical filter.

2.8 SUPPLEMENTAL COMPONENTS/SERVICES

2.8.1 Dual Service Water Piping

Steel pipe, conform to ASTM A53/A53M, Schedule 40, Type E or S, Grades A or B or other European equivalent. Do not use Type F pipe.

Piping and fittings 25 mm, 1 inch and smaller shall have threaded connections. Piping and fittings larger than 25 mm, 1 inch and smaller than 80 mm, 3 inches shall have either threaded, grooved, or welded connections. Piping and fittings 80 mm, 3 inches and larger shall have, grooved, welded, or flanged connections.

2.8.1.1 Escutcheon Plates

Provide one piece or split hinge metal plates for piping entering floors, walls, and ceilings in exposed spaces. Provide chromium-plated on copper alloy plates or polished stainless steel finish in finished spaces.

Provide paint finish on plates in unfinished spaces.

2.8.1.2 Pipe Sleeves

Provide where piping passes entirely through walls, ceilings, roofs, and floors.

Provide steel pipe sleeves or PVC plastic pipe sleeves.

2.8.2 Condensate Drain Lines

Drain piping for HVAC shall be PVC. Painted finishing with Icosit 5530 coating.

2.8.3 Insulation

The requirements for shop and field applied insulation are specified in Section 23 07 00 “THERMAL

INSULATION FOR MECHANICAL SYSTEMS”.

SECTION 23 30 00 - 9

2.8.4 Pipe Hangers (Supports)

Design and locate pipe supports, using the manufacturer's instructions and considering the material used, its diameter and placement (buried or above ground, horizontal or vertical).

2.8.5 Controls

2.8.5.1 Thermostats

Provide thermostats for fan-coil control.

Thermostat ranges shall be selected so that the setpoint is adjustable between plus or minus 5 degrees C of the setpoint indicated.

2.8.5.2 Time Clocks

Provide time clocks for exhaust fan control.

Time clocks shall be a 24-hour, 365-day programmable timing device with two independently timed circuits. Clocks shall have a manual scheduling keypad and alphanumeric display of timing parameters. Timing parameters shall include Gregorian calendar date for month, day and day-of-month indication; and 24-hour time-of-day display, with one-minute resolution for programming the ON and OFF times for each circuit.

2.9 ANCHOR BOLTS

Provide anchor bolts for equipment placed on concrete equipment pads or on concrete slabs. Bolts to be of the size and number recommended by the equipment manufacturer and located by means of suitable templates. Installation of anchor bolts must not degrade the surrounding concrete.

2.10 ELECTRICAL WORK

Provide electrical equipment, including motors and wiring, as specified in Section 26 20 00 “INTERIOR DISTRIBUTION SYSTEM”. Provide manual or automatic control and protective or signal devices required for the operation specified and control wiring required for controls and devices specified, but not shown. For packaged equipment, include manufacturer provided controllers with the required monitors and timed restart.

2.11 CHILLER UNIT AND ACCESSORIES (30RC-0155610-610)

Replace the existing chiller with a new one to be placed on the roof. Include accessories such as piping connections, thermostats, thermometers, pressure gauges, flow switches (linked to the circulating pumps breaker), manual balancing valves, strainer, flexible connections, metallic bedplate, vibration absorbers, complete electrical installation and breaker from the existing panelboard, etc...Include hydraulic balancing and unit start-up. Replace external circulation pumps in case the existing pumps are not able to provide the required nominal water flow of the new chiller.

The new chiller shall have the following characteristics:

Reference model 30RC-0155610-610

Condenser type Air cooled

Compressor type Digital scroll

Refrigerant R-32

Operating weight 433 Kg

SECTION 23 30 00 - 10

Unit dimensions (LxWxH) mm 1676x1094x1688

Fluid flow (nominal) 2.1 l/s

Chiller pressure drop 32 KPa

Cooling capacity 50.8 KW

Total unit power 16.83 KW

Cooling efficiency (EER) 3.02

Voltage 208V/III/60Hz

MCA 66.77A

3 EXECUTION

3.1 EXAMINATION

After becoming familiar with all details of the work, verify all dimensions in the field, and advise the Contracting Officer of any discrepancy before performing the work.

3.2 INSTALLATION

Install materials and equipment in accordance with the requirements of the contract drawings and approved manufacturer's installation instructions.

No installation is permitted to block or otherwise impede access to any existing machine or system.

3.2.1 Condensate Drain Lines

Provide water seals in the condensate drain from all units. Provide a depth of each seal of 50 mm plus

0.1 mm for each Pa, of the total static pressure rating of the unit to which the drain is connected. Provide water seals that are constructed of 2 tees and an appropriate U-bend with the open end of each tee plugged. Provide pipe cap or plug cleanouts where indicated. Connect drains indicated to connect to the sanitary waste system using an indirect waste fitting.

3.2.2 Equipment and Installation

Provide frames and supports for air handling units, fans, dampers, and other similar items requiring supports. Floor mount or ceiling hang air handling units as indicated. Anchor and fasten as detailed.

3.2.3 Metal Ductwork

Install according to SMACNA 1966 and/or UNE-EN 12237 unless otherwise indicated. Install duct supports for sheet metal ductwork according to SMACNA 1966 and/or UNE-EN 12237, unless otherwise specified. Attach supports only to structural framing members and concrete slabs.

Where supports are required between structural framing members, provide suitable intermediate metal framing. Where C-clamps are used, provide retainer clips.

SECTION 23 30 00 - 11

3.2.4 Dust Control

To prevent the accumulation of dust, debris and foreign material during construction, perform temporary dust control protection. Protect the distribution system (supply and return) with temporary seal-offs at all inlets and outlets at the end of each day's work. Keep temporary protection in place until system is ready for startup.

3.2.5 Insulation

Provide thickness and application of insulation materials for ductwork, piping, and equipment according to Section 23 07 00 “THERMAL INSULATION FOR MECHANICAL SYSTEMS”.

3.2.6 Duct Test Holes

Provide holes with closures or threaded holes with plugs in ducts and plenums as indicated or where necessary for the use of pitot tube in balancing the air system. Plug insulated duct at the duct surface, patched over with insulation and then marked to indicate location of test hole if needed for future use.

3.3 CUTTING AND PATCHING

Install work in such a manner and at such time that a minimum of cutting and patching of the building structure is required. Reuse the holes from the previous installation as much as possible. Make holes in exposed locations, in or through existing floors, by drilling and smooth by sanding. Use of a jackhammer is permitted only where specifically approved. Make holes through masonry walls to accommodate sleeves with an iron pipe masonry core saw.

3.4 CLEANING

Thoroughly clean surfaces of piping and equipment that have become covered with dirt, plaster, or other material during handling and construction before such surfaces are prepared for final finish painting or are enclosed within the building structure. Before final acceptance, clean mechanical equipment, including piping, ducting, and fixtures, and free from dirt, grease, and finger marks. When the work area is in an occupied space such as office, laboratory or warehouse protect all furniture and equipment from dirt and debris.

Incorporate housekeeping for field construction work which leaves all furniture and equipment in the affected area free of construction generated dust and debris; and, all floor surfaces vacuum-swept clean.

3.5 PENETRATIONS

Provide sleeves and prepared openings for duct mains, branches, and other penetrating items, and install during the construction of the surface to be penetrated. Cut sleeves flush with each surface.

Place sleeves for round duct 380 mm and smaller. Build framed, prepared openings for round duct larger than 380 mm and square, rectangular or oval ducts. Sleeves and framed openings are also required where grilles, registers, and diffusers are installed at the openings. Provide 25 mm clearance between penetrating and penetrated surfaces except at grilles, registers, and diffusers. Pack spaces between sleeve or opening and duct or duct insulation with mineral fiber.

3.5.1 Insulation

Provide duct insulation in accordance with Section 23 07 00 “THERMAL INSULATION FOR MECHANICAL SYSTEMS” continuous through sleeves and prepared openings except firewall penetrations.

Terminate duct insulation at fire dampers and flexible connections. For duct handling air at or below 16 degrees C, provide insulation continuous over the damper collar and retaining angle of fire dampers, which are exposed to unconditioned air.

SECTION 23 30 00 - 12

3.5.2 Closure Collars

Provide closure collars of a minimum 100 mm (4 inches) wide, unless otherwise indicated, for exposed ducts and items on each side of penetrated surface, except where equipment is installed. Install collar tight against the surface and fit snugly around the duct or insulation. Grind sharp edges smooth to prevent damage to penetrating surface.

3.5.3 Firestopping

Where ducts pass through fire-rated walls, fire partitions, and fire rated chase walls, seal the penetration with fire stopping materials.

3.6 IDENTIFICATION SYSTEMS

Provide identification tags made of brass, engraved laminated plastic, or engraved anodized aluminum, indicating service and item number on all valves and dampers.

3.7 DUCTWORK LEAK TEST

Leak tests shall be carried out in accordance with the UNE EN 1507 test standard if the ducts have a rectangular cross-section or UNE EN 12237 if the ducts have a circular cross-section.

Leakage tests shall be performed before the ductwork is made inaccessible by the installation of thermal insulation or the closure of masonry works and suspended ceilings. The allowable leakage rate shall be in accordance with the defined sealing class. Once the test pressure has been reached and maintained, the air leakage value will be obtained and compared with the maximum allowable.

3.8 TESTING, ADJUSTING, AND BALANCING

The requirements for testing, adjusting, and balancing are specified in Section 23 05 93 “TESTING, ADJUSTING AND BALANCING FOR HVAC”. Begin testing, adjusting, and balancing only when the air supply and distribution, including controls, has been completed, with the exception of performance tests.

3.9 PERFORMANCE TESTS

Conduct performance tests as required in Section 23 05 93 “TESTING, ADJUSTING AND

BALANCING FOR HVAC”.

3.10 CLEANING AND ADJUSTING

Thoroughly clean ducts, plenums, and casing of debris and blow free of small particles of rubbish and dust and then vacuum clean before installing outlet faces. Wipe equipment clean, with no traces of oil, dust, dirt, or paint spots.

Provide temporary filters prior to startup of all fans that are operated during construction, and provide new filters after all construction dirt has been removed from the building, and the ducts, plenums, casings, and other items specified have been vacuum cleaned. Perform and document that proper "Indoor Air Quality During Construction" procedures have been followed; provide documentation showing that after construction ends, and prior to occupancy, new filters were provided and installed. Maintain system in this clean condition until final acceptance.

3.11 OPERATION AND MAINTENANCE

Submit two manuals at least 2 weeks prior to field training.

Conduct a training course for the members of the operating staff as designated by the Contracting Officer. Make the training period consist of a total of 8 hours of normal working time and start it after all work specified herein is functionally completed and the Performance Tests have been approved. Conduct field

SECTION 23 30 00 - 13

instruction that covers all of the items contained in the Operation and Maintenance Manuals as well as demonstrations of routine maintenance operations.

*** END OF SECTION ***