Annex B - Additional Technical Specifications.pdf

Page 1 of 21 TECHNICAL SPECIFICATIONS

U.S Department of State (DOS)

ANNEX B

TECHNICAL SPECIFICACIONS FOR THE AIR CONDITIONING AND VENTILATION SYSTEMS OF

CHOLUTECA MORGUE PROYECT.

Bureau of International Narcotics and Law Enforcement Affairs (INL) U.S. Embassy – Tegucigalpa, Honduras

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Contents

CHAPTER 1 – EQUIPMENTS

1. GENERAL

2. DOAS-01 DEDICATED OUTSIDE AIR SYSTEM (DOAS) AIR CONDITIONING EQUIPMENT

3. UP-01 AIR CONDITIONING EQUIPMENT

4. MINISPLIT AIR CONDITIONING UNITS

5. VARIABLE AIR VOLUME TERMINAL EQUIPMENT

6. MECHANICAL VENTILATION EQUIPMENT

CHAPTER 2 - CONTROLS AND SEQUENCE OF OPERATION

7. CONTROLS

8. CONTROL SEQUENCE OF THE UP-01 AND DOAS-01 UNITS

9. CONTROL SEQUENCE OF THE PIPELINE TERMINALS

10. CONTROL SEQUENCE OF VARIABLE FLOW DIFFUSERS

11. ZONE TEMPERATURE CONTROL (DOAS)

12. CONTROL SEQUENCE OF MINISPLIT UNITS

CHAPTER 3 – MATERIALS

13. DUCTS

14. GATES

15. REFRIGERATION PIPE

CHAPTER 4 - DIFFUSERS & GRILLES

16. SQUARE DIFFUSERS IN CEILING PLATE

17. SHUTTER GRILLES FOR RETURN AND EXTRACTION

CHAPTER 5 – INSTALLATION

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CHAPTER 1 – EQUIPMENTS

1. GENERAL

1. The air conditioner equipment for UP-01 and DOAS-01 are located on the rooftop.

2. The fastening brackets of the packaged units will be on concrete bases and are required to be spring-type vibration absorbers, with a neoprene base, selected for the actual weight at each support point, according to the manufacturer's requirements. The dimensions and reinforcements of such structures must be calculated by the contractor according to the characteristics of the proposed equipment.

3. It is the contractor's obligation to install condensate traps in each of the equipment's drainage lines, in addition to taking these pipes to the drainage points (rainwater drainage) closest to the equipment's location. The diameter of such pipes is 1", however, the contractor should check the manufacturer's installation manual, and if it is necessary to use a larger diameter of pipes, they should include it in their bid.

4. The contractor is required to supply the control cable from the unit to the thermostat or controller that controls its operation, as well as the control cable between the remote temperature sensor and the thermostat.

5. The condensers must have a coil protective guard. The condensate tray must be made of a non-corrosive material. The equipment must have a 2" filter bank with MERV 13 efficiency. The unit shall have easy-open access gates in the following modules: Blower, Coil, Filters, Mixing Box, Electrical Compartment.

6. The UP-01 and DOAS-01 are three-phase and is to be connected at 208v-3-60Hz voltage.

The compressor must be protected with switches for high and low refrigerant pressure.

The motor must have thermal overload protection and must be coupled to the blower by means of belts and pulleys.

7. The compressors must be of Scroll type. The unit must meet the efficiency requirements of the ASHRAE Standard 90.1.

8. The equipment must be electrically protected with a voltage protector and phase monitor with start-up retarder.

9. The UP-01 and DOAS-01 must have a differential pressure gauge installed to be able to take readings of the air pressure difference before and after the filters, with analog or digital face, with a scale in unit of measurement of inches of water column (PCDA), with a range of 0" - 1.0".

10. The UP-01 and DOAS-01 should be fitted with an adjustable differential pressure switch for detection of dirty filters. One per filtering stage. They should be set to 0.50 inches of water column, so that when the pressure drop in the filter exceeds 0.50" then it sends a signal to the thermostat that the filter is dirty and needs to be replaced.

2. DOAS-01 DEDICATED OUTSIDE AIR SYSTEM (DOAS) AIR CONDITIONING EQUIPMENT.

Box

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The housing of the unit must be constructed of heavy-gauge galvanized steel coated with zinc.

Exterior surfaces should be cleaned, phosphated, and finished with a weather-resistant baked enamel finish. The surface of the unit will be tested for approximatelu 672 hours in a salt spray test in accordance with ASTM B117. The unit will have 2-inch-thick, two-component antimicrobial polyurethane rigid foam insulation, encapsulated in metal with no exposed edges. Initial R-value of 6.7 per inch thickness.

The base tray of the unit should have no penetrations within the perimeter of the curb other than the raised downflow supply/return openings to provide additional water integrity precaution if the condensate drain backs up.

Top of the unit

The top cover must be one-piece or, where seams exist, must be double-hemmed and sealed with gasket with ribbed top.

Sensors

A factory-installed combined outdoor air sensor located in the outdoor air hood is designed to detect both outdoor air temperature and relative humidity for the microprocessor controller to use to make the required ventilation, cooling, dehumidification, and heating decisions.

Inner Coil Type: DX 6 Rows

Includes inch copper tubes with internal fins mechanically attached to a configured aluminum plate fin. The coils should be leak tested at the factory to ensure pressure integrity. The evaporator coil shall be leak tested at 500 psi and at a pressure of 500 psi. A stainless-steel double-slope condensate drain pan with the possibility of condensate drain through the wall of the unit is standard. The evaporator coil will have 6 interlocking rows for superior sensitive and latent cooling.

Compressor: Digital Scroll-1st Circuit

Should have hermetic, direct drive, digital scroll type compressors with centrifugal type oil pumps. The motor must be cooled by suction gas and must have a voltage utilization range of plus or minus 10 percent of the unit's nameplate voltage.

Internal overloads shall be provided with the scroll compressors. Crankcase heaters shall be included. The compressor must be able to fully modulate from 20% to 100%.

Outer coil type: air-cooled fin and tube

(Fin and Tube Coil) – Copper tubes with internal fins mechanically attached to a configured aluminum plate fin will be standard. The coils will be leak tested at the factory to ensure pressure integrity. The condenser coil shall be leak tested at 500 psi and at a pressure of 500 psi. The condenser coil will have a finned design with small gaps for easy cleaning.

Outdoor fans: They must have a direct-drive vertical discharge design with corrosion-resistant, low-noise fiberglass-reinforced polypropylene struts, powder-coated wire discharge guards, and electroplated motor mounting brackets. Fans shall be statically and dynamically balanced.

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Supply fan motor type: Direct drive with VFD

The supply fan motor must be of the direct drive type with variable frequency drive installed at the factory. All engines shall be thermally protected. All fans should be mounted on rubber vibration isolators to reduce noise transmission.

Exhaust fan motor type: Direct drive with VFD

The exhaust fan motor must be of the factory-installed variable frequency drive direct drive type.

All engines shall be thermally protected. All fans shall be mounted on rubber vibration isolators to reduce noise transmission.

Filter: MERV-13, 80%

Includes Aluminum mesh filters and galvanized mesh bird screens at the entrance of the unit. In addition, a row of 2-inch (80 percent) MERV-13 filters shall be installed before the evaporator coil. The unit should be equipped with a 6" filter frame upstream of the evaporator. The frame must be able to be adjusted in the field to match any combination of filters.

Electrical Options: Fuseless Disconnect "Circuit Breaker"

A 3-pole molded case HACR circuit breaker with provisions for electrical connections through the base must be installed at the factory. Wiring shall be provided from the circuit breaker to the unit's high-voltage terminal block. The switch shall be UL/CSA recognized. The circuit breaker shall be sized according to NEC and UL guidelines.

Factory wired voltage/phase monitor shall be included as standard. In any of the following cases, the drives shall shut down, and once the fault condition is corrected, the drive shall automatically reset and restart.

1. Phase Unbalance Protection: Factory Setting 2%

2. Over/Undervoltage/Shutdown Protection: +/-10% of nameplate voltage

3. Phase Loss/Reversal

Hail Guards:

Hail guards shall be installed on the outside of the condenser coil. The guards shall consist of perforated metal, of the same gauge and color as the unit itself. Airflow through hail guards should not be restricted due to the location or size of the perforations. Guards shall be removable to accommodate coil cleaning.

3. UP-01 AIR CONDITIONING EQUIPMENT.

Type Direct Expansion Package of 12.5 Tons Refrigeration, High Efficiency, (EER 11.0) of two stages of cooling, with fresh air inlet and regulation damper, uses ecological refrigerant R-410a.

The UP-01 unit must have the supply and return duct connections horizontally on the side of the equipment. Additionally, they must have a fresh air intake from the outside. The fresh air intake

Page 6 of 21 TECHNICAL SPECIFICATIONS must have a manually adjustable damper with opposing blade blades and a mesh that prevents insects from entering.

General

- Convertible airflow.

- Symbio controls the operating range between 0°F and 125°F from factory for cooling mode.

- Factory assembled, internal wiring, fully loaded with R-410A,

- Tested to verify cooling operation, fan and fan rotation, and control sequence before leaving the factory.

- Coloured and numbered internal unit wiring for simplified identification.

- cULus listed and labeled units, rated according to central cooling air conditioners.

Hail guards.

- Provided with condenser coil protection.

Casing

- Zinc-coated heavy-gauge galvanized steel.

- Pre painted weather-resistant metal with galvanized substrate.

- Meets ASTM B117 salt spray test, 672 hours.

- Removable single-sided maintenance access panels.

- Exposed vertical panels and top covers in the indoor air section insulated with a cleanable foil-faced,, fire retardant permanent, oderless glass fiber material.

- The base pan must have no penetrations within the perimeter of the curb other than the

1-inch high downflow supply/return openings to provide additional water integrity precaution if the condensate drain backs up.

- 1/8-inch aluminum face closed-cell insulated unit base.

- Unit base includes forklifts and/or crane lifts on three sides of the unit.

Microchannel Coils

- Compact, all-aluminum microchannel coils

- welded aluminum structure for fin protection.

- flat tubes

- Factory-tested leak-proof coils to ensure pressure integrity.

Compressors

- direct drive scroll compressors with centrifugal type oil pumps.

- Suction gas-cooled motor with a voltage utilization range of plus or minus 10 percent of the unit's nameplate voltage.

- Standard internal overloads with scroll compressors.

- Crankcase heaters on all compressors.

- dual compressors.

Filters

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- Standard disposable filters.

- 2-inch MERV 13 filters.

Motorized Outdoor Air Damper

- Once set, when the indoor fan starts, the outdoor air dampers should open to the set position.When the indoor fan is turned off, the damper should close to the fully closed position.

4. MINISPLIT AIR CONDITIONING UNITS.

1. In the project there are two wall-mounted Minisplit units.

2. The unit that is in the data room is a unit that serves as a backup to the central system, so that in case of a failure of the main system (the UP-01 unit), the mini-split unit is responsible for keeping that area cooled.

3. The mini-split unit in the data room considers a high-efficiency 21.50 EER direct expansion type mini-split air conditioning unit with 24,000 BTU/Hr wall evaporator, with horizontal discharge type rooftop condenser, with twin rotary inverter compressor.

4. The mini-split unit in the waiting area considers a high-efficiency 18.00 EER direct expansion air conditioning unit, mini-split with 36,000 BTU/Hr wall evaporator with rooftop condenser horizontal discharge type with twin rotary inverter compressor.

5. VARIABLE AIR VOLUME TERMINAL EQUIPMENT.

1. In the project, terminal boxes with variable air volume are considered to be able to control the temperature by zones, which we will call VAV.

2. To allow the user to control the temperature of the area where it is, the system incorporates variable air flow (VAV) terminals, which allow the temperature of a certain area to be controlled by varying the flow of air conditioning that is supplied to the area depending on the temperature that is registered in it. Likewise, VAVs allow establishing in the system, a minimum and maximum flow of air that can be supplied to each area.

3. The system operates with VAV with independent pressure control, which allows better control of the entire system since the pressure that exists does not depend on the duct system, allowing to ensure that each area of the building will provide a maximum and minimum amount of air within them.

4. Product data shall be provided with data indicating the configuration, general assembly, and materials used in manufacturing, including catalog performance indices indicating airflow, static pressure, NC designation, electrical characteristics, and connection requirements.

5. The installation plans should indicate the configuration, overall assembly, and materials used in manufacturing, as well as electrical characteristics and connection requirements.

6. The manufacturer's installation instructions should state the support and pendant details, installation instructions, recommendations, and required service authorizations.

7. Project registration documents must record the actual locations of control units and components and access door locations.

8. The manufacturer's warranty will need to be submitted and ensure that the forms have been completed in the US Embassy’s name and are registered with the manufacturer.

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9. Supply and install single-duct terminal units (SDV) similar to the Price model in the sizes and configurations indicated on the drawings.

10. The housing of the unit must be constructed with a minimum of 22 gauge, 0.032-inch galvanized steel. The housing will be assembled with longitudinal locking construction seam. Housing leakage must be tested in accordance with ASHRAE 130.

11. Fiberglass Lining - FG. The insulation must meet the requirements of UL 181 (erosion), ASTM C1338 (fungal resistance), ASHRAE 62.1, and ASTM C1071, which has a maximum flame/smoke spread of 25/50 for both insulation and adhesive when tested in accordance with ASTM E84. The insulation must be secured with adhesive. Insulation edges exposed to the air stream must be coated with an NFPA 90A approved sealant. The thickness of the insulation shall be 1 inch thick, R-value of 4.1.

12. Primary Air Damper Assembly: The damper assembly should be made of heavy-gauge galvanized steel with a solid shaft rotating at the bearings. The damper shaft must incorporate a visual position indicator engraved on the end of the damper shaft to clearly indicate the position of the damper over the full 90-degree range. The damper shaft should be mounted on [left], or [right], of the damper when facing in the direction of airflow. The 18-gauge damper assembly must incorporate a peripheral gasket on the damper blades for tight airflow shut-off. Air leaks passing through the closed damper must not exceed 2 percent of the unit's maximum rated airflow at a static water meter inlet pressure of 3.0 inches, tested in accordance with ASHRAE 130. The damper, seal and bearing system shall be tested at 1.25 million cycles, or the equivalent of 100 complete openings/closings per day for 35 years, with no visible signs of wear, breakage, or failure of the damper assembly after such tests.

13. Air Flow Sensor: The air flow sensor should be a differential pressure air flow device that measures total and static pressures, and it should be mounted on the inlet valve. Plastic parts must be fire-resistant and comply with UL 94. The airflow sensor must comply with RoHS (Restriction of Hazardous Substances). Materials containing polybrominated compounds are not acceptable. The control tube must be protected by washers on the wall of the airflow sensor housing. The airflow sensor will be supplied with twelve total pressure sensing ports and four static pressure sensing ports and will include an averaging chamber hub that amplifies the detected airflow signal. After balancing, the signal accuracy of the airflow sensor will be more or less than five percent over the entire operating range of the terminal.

14. Inlet Valve: The inlet valve must have a consistent diameter to retain the flexible conduit and provide a stop for the hard conduit. The inlet valve should include a 1/8-inch raised single bead weld for added strength. The gasket seal should be a continuous low-leakage piece with a peripheral gasket for airtight airflow shutoff. The inlet valve must include two heavy-duty stop pins to accurately position the damper in the closed and open positions.

15. Control transformers: The terminal unit must be supplied with a factory-mounted 50 VA control transformer.

16. Electrical requirements: Single-conduit terminal units will be provided.

17. Installation: Install terminal units according to the manufacturer's instructions. Install air terminal unit inlets with airflow sensors at a minimum of three duct diameters from elbows, transitions, and duct takeoffs. See bidding plans for the size(s) and duct

Page 9 of 21 TECHNICAL SPECIFICATIONS location(s) of the air terminal units. Provide roof access doors or locate units above easily removable roof components. Support the terminal units individually from the structure.

Embed anchors in concrete in accordance with ASTM E488/E488M. Do not support the terminal units from the ducts. Connect the terminals to the conduit according to specifications. Verify that electrical power is available and of the correct characteristics.

18. Fit: Ensure that the damper operator attached to the assembly allows full modulation of the flow range from 100 percent of the design flow to zero.

19. All features and functions listed in the equipment table for variable volume terminals must be met.

6. MECHANICAL VENTILATION EQUIPMENT.

1. The EXT-01 bathroom exhaust equipment is a mushroom type centrifugal fan with upward air discharge for rooftop slab mounting. The fan wheel shall have backward-sloping blades, which shall be statically and dynamically balanced. The fan enclosure or housing shall be constructed of heavy-gauge aluminum with a rigid internal structure. A galvanized rigid wire mesh shall protect the fan from animals such as birds and other small objects at the discharge. The transmission of power from the motor to the fan of the extractor will be done directly. The engine shall have variable speed technology, with speed controls inserted in the engine itself. Motors shall be equipped with heavy-duty lubricated ball bearings, carefully set to the fan load and finished to the specified voltage, phase, and cabinet. The motors shall be mounted on vibration absorbers outside the air stream. The engine must be provided with fresh air free from the discharge of pollutants for cooling. Engines should be easily accessible for maintenance.

2. All ventilation equipment must have a Nema-1 type switch to be installed in the field where appropriate. Likewise, each of these equipment must have a voltage protector and starting retarder.

3. Each of the extraction equipment must have a plate provided by the manufacturer that contains the model and serial number written on it for future identification of the equipment.

4. The equipment must be labeled to be able to identify it with the same nomenclature used in plans.

5. Both the control cable, from the switch to the equipment, and the raceway piping for that cable shall be supplied and installed by the contractor.

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CHAPTER 2 - CONTROLS AND SEQUENCE OF OPERATION

7. CONTROLS

1. The air conditioning contractor shall be responsible for supplying and installing the control system described herein, including in its bid both the control devices and their accessories, as well as all the ducting and wiring that is required.

2. The control ducting must be carried out using EMT pipe and all its accessories in compliance with the NEC standard. It is allowed to use PVC pipes for electricity and compatible accessories.

3. The type of cable, thickness, number of lines and wrapping must be in accordance with the recommendations of the manufacturer of the controls, according to the distances to avoid pressure drops.

4. The package unit must be fitted with a three-phase voltage protector, which has the ability to protect the equipment from low and high voltage, from loss or phase imbalance, and must also have a start-up delay regulator for the equipment.

5. The thermostats must be adjusted so that when the equipment has managed to lower the temperature to the point set on the thermostat, the compressors turn off, but the fan that pushes the air through the ducts (blower) must continue to run until the thermostat is manually turned off. This must be done in this way to ensure that the equipment recirculates the air and maintains a homogeneous temperature in all conditioned areas, even when the compressors have stopped due to temperature.

6. Phase protector retarders must be regulated so that when the equipment is turned on or when the electrical power returns, not all the equipment starts at the same time.

7. The control of the amount of fresh air supplied to the system will be completely manual, by opening or closing the fresh air intake damper.

8. All package units must have a differential pressure switch to detect dirty filters and send a signal to the equipment controller, which will display an alarm on the screen that the filters require inspection because they are dirty. The differential pressure range of the switch should be between 0.1" and 1.0" water column.

9. The UP-01 unit must have a 7-day-a-week programmable digital thermostat with 2 stages of cooling, with auxiliary input for external return temperature sensors and with a digital auxiliary input to use as an alarm to detect dirty filters.

10. In relation to the exhaust fan, it will be automatically switched on through energy links with the central pack-type units that command its switching on and off. The EXT-01 will enter into operation when the UP-01 package unit turns on and will turn off when the UP- 01 is turned off.

11. In relation to the operation of the VAV boxes, to control the temperatures of each zone in the building, they will operate independently depending on the monitoring of the temperature of the zone and the programming that is entered at the time of their installation (Stand Alone), however, their switching on and off depends on the energization of the corresponding central unit.

12. Motorized temperature control dampers depend on their energization on the ignition of the unit to which they correspond. Its action will be based on the temperature reading it

Page 11 of 21 TECHNICAL SPECIFICATIONS receives from the thermostat, since it is of the proportional type. In the air supply duct, the damper shall operate in such a way that its opening is adjusted according to the set point temperature. The gate located in the air return duct shall be commanded to open or close proportionally, in the same way as is done with the gate in the supply duct.

8. CONTROL SEQUENCE OF THE UP-01 AND DOAS-01 UNITS.

The control sequence for the air conditioning package units is as follows:

By schedule, it will be commanded in a programmed way, to turn on the fan of the package units, on different days of the week. In principle, the units will be on 24 hours a day, 7 days a week.

A set point temperature must be defined for the return of air conditioning. Use at 73.4ºF is recommended.

While the area is in occupied mode, at the times of use defined by the customer, the thermostat will be sending a proportional signal of 0-10v to the unit's controller, to control the air supply temperature of the package unit according to the table of the equipment in plans. Because the unit is direct expanding, the equipment must come from the factory with special controls and compressors with technology that prevents the equipment from freezing when there is a very low air flow. The temperature to be controlled is the air supply temperature, by means of a remote sensor in the air outlet duct. Areas that have a low thermal load and reach the design temperature will be ordered to close the VAV boxes or VAV diffusers proportionally to control the design temperature in those areas.

The thermostat must have the filter condition monitoring cable connected to a binary input by means of a differential pressure switch. The thermostat will generate an alarm signal when the pressure drop in the filter is greater than that of the set point.

When the differential pressure switch detects a pressure drop greater than or equal to the set point, then it will be alarmed by dirty filter. This will indicate that it's time to replace dirty filters with new filters.

In the case of the UP-01 unit, there is a variable speed motor for the air supply, which will vary in speed depending on the pressure inside the duct, which can change depending on the opening of the VAV boxes and VAV diffusers. The more closed these devices are, the higher the static pressure inside the duct, so the fan motor must be commanded to slow down to lower the pressure until it reaches the set point. When the VAV boxes or VAV diffusers are opened again, the pressure drops, so the drive will increase the speed of the motor until the duct set point pressure is reached.

In the case of the DOAS-01 unit, the air supplied is 100% outside air. This equipment has two fan motors, one for air supply and one for air extraction, each with variable speed drives. The equipment should come with a factory smart controller to control all internal devices. There are some areas with constant flow diffusers, and others with motorized dampers to regulate the

Page 12 of 21 TECHNICAL SPECIFICATIONS temperature of the area. When in these areas the thermostat detects that the temperature is higher than the set point, it will open the damper proportionally until it is possible to lower and reach the set point temperature. In the event that the temperature is below the set point, the thermostat will command to proportionally close the supply and return dampers in that area, until the temperature manages to rise and reach the set point temperature.

9. CONTROL SEQUENCE OF THE PIPELINE TERMINALS.

The duct terminal units will be commanded to be switched on at the request of the user. Each application-specific controller, VAV, carries a zone thermostat that allows the user to set control parameters. Each duct terminal is programmed and adjusted to maintain a specific airflow in that environment. Regardless of the pressure of the main duct, the VAV controller is able to maintain the desired flow rate in the area. The controller will be responsible for receiving the temperature signal from the area, through the sensor in the thermostat and will try to maintain the desired temperature by opening or closing the gate proportionally.

The moment you command the package unit to turn on, the duct terminal units related to that package unit will be enabled to adjust the opening of its gate to maintain the zone temperature according to the thermostat set point related to that duct terminal.

Variable air volume boxes have a maximum flow rate of use and a minimum flow rate according to the table in plans. In case cooling is required in an area, the damper can be opened to the maximum flow rate. If no cooling is required, the damper should remain in the minimum flow position and should not close completely until the package unit is turned off.

10. CONTROL SEQUENCE OF VARIABLE FLOW DIFFUSERS.

The variable flow diffusers will be commanded to be switched on at the request of the user. The supervisory controller is only responsible for monitoring them, as these units already come with an application-specific intelligent controller. The supervisory controller will allow the configuration and adjustment of each diffuser remotely and will allow the BMS to observe and publish the operation of this equipment. Each application-specific controller, VAV Diffuser, carries a zone thermostat that allows the user to set the control parameters. Each diffuser is programmed and adjusted to maintain a specific airflow in that environment. Regardless of the pressure of the main duct, the diffuser controller is able to maintain the desired flow rate in the area. The controller will be responsible for receiving the temperature signal from the area, through the sensor in the thermostat and will try to maintain the desired temperature by opening or closing the gate proportionally.

By means of the intelligent system, the server will command to close the damper of the diffusers that are related to the air handling units that are commanded to be turned off. The moment an air handling unit is commanded to be turned on; the diffusers related to that air handling unit will be enabled to adjust the opening of its damper to maintain the zone temperature according to the thermostat set point related to that diffuser.

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Variable air volume diffusers have a maximum flow rate and a minimum flow rate according to the table in plans. In case cooling is required in an area, the damper can be opened to the maximum flow rate. If no cooling is required, the damper should remain in the minimum flow position and should not close completely until the handling unit is turned off.

11. ZONE TEMPERATURE CONTROL (DOAS).

In certain areas cooled by the DOAS-01-unit, zone control consists of a proportional type motorized damper installed in the air supply duct, which serves to interrupt the flow of air to the controlled area, so that when the set point temperature is reached on the zone thermostat, The supply damper closes proportionally. To avoid changes in air pressure inside the ducts and imbalance of air flow in the rest of the rooms, there is also a motorized damper in the air extraction duct, which when the supply damper closes proportionally, it also closes proportionally. In the case of the fourth level, the relief damper is connected directly to the return duct.

These two proportional control gates will be commanded to open or close by means of the same digital thermostat located on a wall within the area to be controlled.

The DOAS unit has variable speed motors, and pressure sensors in the supply duct and in the extraction duct, so that when the temperature control gates are closed or opened proportionally by zone, the unit's controller will be responsible for modulating the speed of both motors to keep the pressure stable within the supply and extraction ducts, and avoid imbalances in the other air-conditioned areas.

12. CONTROL SEQUENCE OF MINISPLIT UNITS.

The mini-split units will be commanded to be turned on with a remote control.

In the waiting area, the unit will be commanded to turn on and stay on to control the temperature of the area at 73ºF.

In the data room, the unit serves as a backup and will be commanded to turn on and stay on to control the temperature of the zone at 75ºF. Because there is a diffuser in that area that comes from the package unit and the temperature is 72ºF, the mini-split unit will be on but will not be cooling, since the set point temperature of the Minisplit is higher than that already in the air supply diffuser of the package unit. Therefore, the mini-split unit will begin to cool only in those cases where the package unit is turned off or when it fails and is not able to cool the area, and the temperature of the room exceeds 75ºF.

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CHAPTER 3 – MATERIALS

13. DUCTS

1. Regarding the duct sheet: All the work of ducts and gates will be manufactured with top quality galvanized sheet (Lockforming quality). The term "duct work" refers to the supply of all properly installed and tested ducts, gates, gaskets, reinforcements and suspensions in the system. The ducts will be galvanized iron sheets, in their quality for stapling and coating Galván of 0.90 oz. per square foot (G90) per ASTM A653 and ASTM A924 standards, in indoor and outdoor installations.

2. The dimensions shown in the drawings refer to the interior dimensions of the same (net measurements), all the work of ducts will be done according to the tables that appear in the plans. For ducts, the table for 2" static pressure drop that appears in detail D-24 of the drawings must be used.

3. The contractor shall supply and install the insulation specified herein for the ducts. The work of placing and coating the insulation will be carried out by a workforce of recognized experience and skill in this type of work.

4. The air conditioning supply and return ducts that are installed inside and are exposed or that go outside the building, must be lined internally with thermal insulation.

5. The thermal insulation must be the same or similar to that manufactured by KNAUFF, model DUCT LINER E-M, which is semi-rigid, made with inorganic glass fibers adhered by means of a thermoset resin with edges covered with encapsulating material; Fiberglass insulation must be 1.5" thick, with a density of 1.5 pounds per cubic foot with a thermal resistance value of 6.0 ft²·°F·h/Btu.

6. The thermal insulation must be adhered to the duct by means of non-flammable adhesives equal or equivalent to that manufactured by FOSTER, model DUCT-FAS ADHESIVE 85-23 applied to 90% of the surface of the sheet where it will be adhered.

Additionally, mechanical fasteners must be used inside the duct equal or similar to the DURO-DYNE brand fasteners, model DYNASTICK, to fasten the sheet to the walls of the duct without the need to drill and/or weld the duct. However, the use of spigoted nails, with metal plates, is accepted. The joints and transverse joints between duct sections must be covered with previously specified adhesive. Drilling the duct to install the metal fasteners is not acceptable.

7. The final measurements of the air conditioning duct once the internal thermal insulation is installed, must be equal to the internal design measurements of the duct that appear in design plans. The installation of thermal insulation must not reduce these internal dimensions of the duct.

8. For indoor ductwork, the thermal insulation shall be the same or similar to that manufactured by KNAUFF, model FRIENDLY FEEL DUCT WRAP, which is flexible, 11/2" thick fiberglass and with a density of 0.75 pounds per cubic foot, with a thermal resistance value of 4.2 ft²·°F·h/Btu (once installed with 25% compression), Protected with aluminum vapor barrier. It is very important that the contractor when lining the ducts, do not leave them soaked, the fiberglass must be loose. The fiber should be expanded to at least 1 1/8".

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9. In the external lining of the ducts, the joints of the fiber thermal insulation must finally be sealed with aluminum tape.

10. Fresh air intake ducts will not need to be lined with thermal insulation.

11. Connections to the air conditioning units will be made with commercial-grade flexible outdoor ductwork similar to those manufactured by DURO-DYNE, model DUROLON #10002 MFD METAL FAB. Flexible connections shall be firmly secured by means of a galvanized sheet collar to each of the adjacent ducts. Flexible connections shall be wide enough to allow play between the two metal collars, with minimum dimensions of 3" of metal x 6" of flexible material x 3" of metal.

12. All equipment or material defective or damaged during the construction or testing period must be replaced with new material or equipment.

13. Round flexible ducts shall be used only for the connection of rigid rectangular ducts to an air distribution terminal.

14. The round flexible duct shall be the same or similar to those manufactured by ANCO PRODUCTS INC., model 4625, which are manufactured inside of plastic material with a polyester film, with a flexible structure of spiral steel cable covered with zinc, all thermally insulated by fiberglass with a thickness of 11/4" for a thermal resistance value of 4.2 ft²·°F·h/Btu, protected by a black polyester vapor barrier with a fire retardant adhesive.

15. Flexible ducts must comply with UL-181 Class I Standard.

16. Circular flexible ducts must be supported with galvanized sheet supports of at least 3" wide, hung with tie wire from expander plugs fixed to the slab or from the metal structure.

17. Rigid rectangular ducts must be supported with metal strut channel type supports, hung with threaded rod from expander plugs fixed in the slab or from the metal structure.

18. Duct supports must be in accordance with the D-22 detail table in drawings. The base of the bracket must be galvanized 12-gauge Strut profile. All fastened with double thread and pressure washer. See details D-18, 19, 20, 21 and 22.

19. Adjustable hanging supports, stands, brackets, etc. should be supplied. Necessary for the support of ducts, flexible branches, diffusers and grates. Duct supports shall be spaced a maximum of 1.21 meters (4').

20. All supports must be covered with two coats of black and then grey anti-corrosion paint in those parts where cuts have been made to the galvanized support.

21. Both the threaded rod, nuts and washers must be manufactured from galvanized steel for protection against rust. At the ends of the threaded rods, where a cut has been made, anti-corrosion paint must be applied with two coats.

22. Round flexible ducts must be fastened with galvanized sheet supports, hung with galvanized steel wire from anchors in the slab or from the metal structure as shown in the detail plan.

14. GATES

1. The central unit ducts have for each air outlet an air balance damper, of the type shown in detail D-14, similar to Greenheck MBD-10 or MBD-15, with a 2" lift on the handle to give space for insulation. In the section where the gate goes, the duct has the design

Page 16 of 21 TECHNICAL SPECIFICATIONS dimensions and is insulated on the outside with the same type of insulation as the rest of the ducts and then lined externally with galvanized sheet and sealed with sealant.

2. Volume regulation gates (dampers) will be supplied where indicated in the plans. Such gates shall be installed in such a way that they can be operated from the outside of the pipelines and allow them to be secured in the balancing position permanently.

3. The ducts and grilles will be balanced, and it will be verified that all air handling systems are free and clean of obstruction, as well as that the registers and dampers are in the open position and that all those moving parts are properly lubricated.

4. Fresh air intakes must also have a balancing damper inside the duct.

5. In certain areas cooled by the DOAS unit, there are motorized zone temperature control dampers, in the air supply and exhaust air ducts, controlled by a digital thermostat. These gates open or close proportionally depending on the set point temperature and the temperature recorded by the thermostat in the area.

6. Motorized gates must have a maximum leakage of Class 1 @ 4 in. wg as defined by AMCA (Leak Class 1 is defined as 8 cfm/sq. ft. @ 4 in. wg). Tested in accordance with the AMCA 500-D standard. Gates must meet or exceed IECC (International Energy Conservation Code) requirements for gate leakage rates of 8 cfm/sq. ft. feet to 4 in. WG or less when integral to the building envelope. They will have a maximum differential pressure rating of 5 in. Wg. They shall have a maximum speed rating of 3000 fpm. Data submitted by the gate manufacturer will certify that all pressure drop data is authorized in accordance with the AMCA Certified Qualifications Program for Test Figures 5.2, 5.3, and 5.5. The damper air performance data will be developed in accordance with the latest edition of the AMCA 500-D standard. Dampers must be labeled with the AMCA Air Performance Seal. The action of the blade must be opposite. The hatch frame will be 16 gauge. galvanized steel formed in a 5" structural hat channel. x 1 in. The upper and lower frame members of shocks less than 17 inches tall should have a low-profile design to maximize the clearance area of these smaller shocks. The frame must be a 4-piece construction with integral 1 1/2" overlapping reinforcement reinforcements. (minimum) at each corner to secure square corners and provide maximum resistance to racking.

7. Motorized gates should be similar to Greenheck's Model VCD-23, with the dimensions of the duct where they are located. The gate blades must be 16 gauge. galvanized steel reinforced by three longitudinal V-grooves 1 inch deep that run the entire length of each sheet. Each blade shall be symmetrical in relation to the pivot point of its shaft, exhibiting performance characteristics identical to the airflow in any direction through the shock absorber. Provide symmetrical blades of different sizes as needed to completely fill the gate opening. The orientation of the blade is horizontal. Shaft bearings must be synthetic (acetal) sleeve that rotates in polished extruded holes in the shock absorber frame.

Actuators: Electric, 24V AC, modulating. Mounting Location: External (Outside Duct).

15. REFRIGERATION PIPE

1. The cooling pipes between the evaporator and the condenser shall be made of copper and with the diameters indicated in tables for each equipment, both for the liquid line and for the suction line.

Page 17 of 21 TECHNICAL SPECIFICATIONS

2. The refrigeration pipes will be made of rigid seamless copper pipes conforming to ASTM B280 type "ACR" type K, sealed, dehydrated and pressurized at the factory with nitrogen.

Elbows, reducers, couplings, joints and other accessories shall also be of copper in accordance with ASME B 16.22 standards. All pipe joints, elbows and fittings will be made with silver solder in accordance with AWS A5.8 standards using factory couplings of the same specified material. The gearboxes will be of the concentric type.

3. If the condensing unit is located at a higher height than the evaporator unit, a trap shall be made in the suction line at the outlet of the evaporator and another every 15 vertical feet to prevent the oil from returning to the compressor.

4. In case the equipment does not have a dehumidifier filter, it will be necessary to install one in the liquid line at the outlet of the condenser.

5. The suction tubing and in some cases where required, also the discharge tubing, shall be thermally insulated with flexible, spongy, closed-cell structure preformed tubular insulation such as that manufactured by ARMSTRONG WORLD INDUSTRIES, "ARMAFLEX", conforming to ASTM C 534 type 1, 3/4" minimum thickness. All longitudinal and transverse joints and joints shall be sealed with adhesive in accordance with the insulation manufacturer's recommendations. The insulation of pipes installed outdoors shall be protected with a coating in accordance with the manufacturer's recommendations to protect them against the action of ultraviolet rays. Insulated elbows, fittings, and valves using the same material as specified for pipes of the same specified thickness, using factory-preformed or field-cut parts, according to the manufacturer's instructions and recommendations. Seal all joints with recommended adhesive to prevent air from coming into contact with the surface of the pipes. Install insulation on pipes and fittings strictly following the manufacturer's recommendations, until the cooling pipes have been evacuated, dewatered, and pressure tested in accordance with the relevant section.

6. A moisture indicator should be installed in the liquid line.

7. Copper pipe with a diameter < 7/8" shall be welded with 5% silver rods and other pipes with 15% silver rods.

8. In horizontal paths, the pipes must have a certain inclination or unevenness towards the compressor, so that the oil can return to the compressor and the evaporator is not flooded with oil.

9. The contractor shall strictly follow the piping routes shown in the drawings, with no deviation except for structural obstructions or interior finish conditions. Piping shall be installed to allow inspection and service of the compressor and other equipment. Valves and other specialties should be installed in accessible locations for future service. The installation of pipes shall be carried out by allowing sufficient spaces between the pipes and adjacent walls or hangers for the installation of insulation.

10. Any pipe that passes through walls, floors, slabs, or ceilings must be jacketed. The jackets shall be of adequate inner diameter to permit the installation of insulation. The jackets will be put in place before casting concrete or erecting walls. Fill and seal the gaps between jacket and pipes with soft, waterproof sealant at both ends. The liquid refrigerant piping shall be installed level, and the refrigerant suction piping shall be installed sloped toward the compressor. During the welding process of pipes, valves and refrigeration specialties must be disassembled to avoid heating in the internal parts such

Page 18 of 21 TECHNICAL SPECIFICATIONS as: seats, stems, coils, etc. Avoid applying heat to the bulb of the expansion valve. Use dry nitrogen through the pipes to generate positive pressure and prevent the formation of slag and soot.

11. The pipes shall be tested and inspected in accordance with ASME B 31.5 "Chapter VI" standards, isolating the condensing unit and the evaporation unit from the pipes. The test pressures of the piping shall not be less than the design operating pressures for R- 410a refrigerant, or equal to the pressures to which the valves and safety parts of the system conform. A test pressure greater than 500 PSI is recommended. The test pressure shall be maintained without variation, indicated and recorded on a set of test pressure gauges for the entire duration of the pressure test, the duration of which shall be at least 24 hours. Fill the piping system with dry nitrogen to pressurize, check all welded joints using a solution of glycerin and soap around the joints to indicate leaks. Weld back around leaking joints, using new parts or fittings, and test the pipes again until satisfactory results are obtained.

12. Load the piping system according to the following procedure: Evacuate the piping system using a vacuum pump with a minimum capacity of 500 micrometers and maintain the vacuum for at least 12 hours, with a maximum absolute pressure of 500 microns. Use test pressure gauges to measure vacuum pressure, if after 12 hours the vacuum pressure has not increased by more than 50 microns, consider that the vacuum has been performed and charge the system with refrigerant, breaking the vacuum with an initial charge of refrigerant in the form of gas until an initial pressure of 2 lb/in is obtained.

13. The cooling pipe must be supported from the slab or metal structure through galvanized threaded rods of 1/4" in diameter, on supports constructed of 1"x1"x1"x1/8" angle iron or strut channels. All angle brackets must be covered with two coats of red and then black anti-corrosion paint.

14. The cooling pipe must be supported from the walls with metal clamps.

15. The cooling pipe must be supported to the floor, using 3"x3"x1/8" plate supports in an inverted U shape anchored to the floor with expanding plugs and 1/4" stainless steel bolts, fixing each cooling pipe to the support, by means of half-moons bolted to the support. All platen supports must be covered with two coats of red and then black anticorrosive paint.

16. All pipes must be tied together with plastic strips, with a plastic band every meter.

17. No pipe must be exposed to stresses that may arise from rigid fixation.

18. Runs of pipes that go outside should be protected from rain and sun by covering them with outdoor aluminum foil.

19. All refrigeration pipes and their accessories will be installed strictly following the rules of:

- ASHRAE 15: "Safety Code for Mechanical Refrigeration".

- ASME B 31.5: "Refrigeration Piping".

- ASME: "Boiler and Pressure Vessel Code.

- Section IX: Welding and Brazing Qualifications"

- UL 207: "Refrigerant – Containing Components and Accessories".

Page 19 of 21 TECHNICAL SPECIFICATIONS

CHAPTER 4 - DIFFUSERS & GRILLES

The nomenclature of the diffusers and grilles shown in the plans correspond to their characteristics. The specified brands of diffusers and grilles must be those of North American manufacture, with information published by the manufacturer demonstrating that they have been subjected to laboratory testing and are certified that the information published is correct.

16. SQUARE DIFFUSERS IN CEILING PLATE

Applies to diffusers with DP01 to DP07 nomenclature in bidding plans.

Plate face air conditioning diffusers shall be supplied and installed with the sizes, construction characteristics, air supply pattern configuration and frame indicated in the design drawings and these technical specifications, which shall be the same or equivalent to the air diffusers used as a reference in the design, PRICE mark, ASPD model.

The diffuser manufacturer should provide performance data for air volume, initial pressure drop, sound levels, and draught. All data must be tested according to the most recent ASHRAE 70 publication.

The diffusers must be made of aluminum. Each diffuser consists of a square profile external frame assembly that facilitates the mounting of the diffuser on drywall surfaces or mirrored ceiling ceilings or 24"x24" (610mm x 610mm) aluminum panel type frame suitable for resting on the straps of the ceiling lattice structure for ceilings of the…