20167.2_-_CALEDONIA_AND_KETTLE_LAKE_ELEMENTARY_-_23_8221_-_SELF_CONTAINED_VERTICAL_UNIT_VENTILATORS_-_2020_11_13.pdf

PROJECT NO. 20-167.20 SELF CONTAINED VERTICAL UNIT VENTILATORS

CALEDONIA AND KETTLE LAKE ELEMENTARY 23 8221 - 1

CALEDONIA COMMUNITY SCHOOLS 11/13/2020

[Copyright] 2020 Tower Pinkster Titus Associates - All Rights Reserved

SECTION 23 8221 – SELF CONTAINED VERTICAL UNIT VENTILATORS

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes packaged self-contained vertical unit ventilators.

B. Related Sections include the following:

1. Division 23 Section "HVAC Instrumentation and Control for HVAC" for control devices not packaged with units.

1.2 ACTION SUBMITTALS

A. Product Data: Include rated capacities, furnished specialties, and accessories for each type of product indicated.

B. Shop Drawings: Diagram power, signal, and control wiring.

C. Samples for Initial Selection: For units with factory-applied color finishes.

1.3 INFORMATIONAL SUBMITTALS

A. Field quality-control test reports.

1.4 CLOSEOUT SUBMITTALS

A. Operation and maintenance data.

B. Warranty: As specified in this Section.

1.5 MAINTENANCE MATERIAL SUBMITTALS

A. Furnish extra materials described below that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Filters: Furnish one spare filter for each filter installed.

1.6 QUALITY ASSURANCE

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.

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B. ASHRAE Compliance: Applicable requirements in ASHRAE 62.1, Section 5 - "Systems and Equipment" and Section 7 - "Construction and Startup."

C. ASHRAE/IESNA 90.1-2004 Compliance: Applicable requirements in ASHRAE/IESNA 90.1, Section 6 - "Heating, Ventilating, and Air-Conditioning."

1.7 COORDINATION

A. Coordinate size and location of exterior wall and ceiling openings.

B. Coordinate sending building DDC control system components to unit ventilator manufacturer for factory installation.

1.8 WARRANTY

A. General Warranty: Special warranty specified in this Article shall not deprive Owner of other rights Owner may have under other provisions of the Contract Documents and shall be in addition to, and run concurrent with, other warranties made by Contractor under requirements of the Contract Documents.

1. For units equipped with factory controls - All Components (Parts Only) Warranty: Two years from date of first beneficial use by buyer or any other user, within two years from date of resale by buyer in any unchanged condition, or within 30 months from date of shipment from seller, whichever occurs first.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Manufacturers: Subject to compliance with requirements, provide products by the following:

1. Airedale.

2. Change’Air.

2.2 VERTICAL UNIT VENTILATORS

A. General: Self-contained, factory-assembled, wired, and tested packaged units consisting of cabinet, compressor, refrigerant system, coils, indoor fan, filters, economizer, powered exhaust, unit controls, and indicated options. Provide capacities and electrical characteristics as scheduled.

B. Cabinet: Structural-steel frame with aluminized- or galvanized-steel panels with baked finish in manufacturers standard color and the following:

1. Acoustic foam insulation meeting UL94HF-1 fire rating.

2. Front access doors with low mounted return air grille(s).

3. Sound attenuating inlet plenum.

4. Rear mounted condensate drain connection.

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C. Compressor: Two stage hermetic scroll compressor mounted on vibration absorbers with crankcase heater, internal unloading mechanism, internal overload protector, and compressor sound jacket.

1. An internal overload protector included to protect compressor against excessive motor temperatures and currents.

2. Compressor is equipped with a crankcase heater to guard against liquid flood-back conditions and the elimination of oil foaming upon start up.

3. Factory set high and low-pressure switches, automatic reset high pressure cutout, and automatic reset low-pressure cutout

D. Refrigeration System: The unit shall utilize a factory charge of HFC-R410A (2 Stage) and shall contain a factory fitted thermal expansion device and filter drier, factory set high and low-pressure switches, manual reset high-pressure and low-pressure cut-out, and a sight glass.

E. Indoor Coil: Patented micro-channel evaporator coil designed for maximum heat transfer with minimum footprint and pressure drop. Quick draining evaporator coil designed, tested and fabricated by unit ventilator manufacturer for optimal airflow and heat transfer specific to the unit. Coil is fitted to non-corrosive stainless steel drain trays.

F. Outdoor Coil: Enhanced, high efficiency, cross rifled coil designed, tested and fabricated by unit ventilator manufacturer for optimal airflow and heat transfer specific to the unit.

G. Hot Water Heating Coils: Copper tube with aluminum fins, factory pressure tested, with factory installed manual air vent.

H. The indoor fan assembly consists of one blower inside teardrop housing assembly engineered specifically for optimal airflow with low noise and minimal power consumption. Blower is powered by electronically commutated motor (ECM). The DC motor features brushless, permanently lubricated ball bearing construction for maintenance free operation. A wide range of programmable speeds and torque characteristics is possible for ultra-high efficiency and low audible noise. The ECM provides constant airflow by automatically adjusting the speed if the external static pressure changes. Electrical and control wiring to fan assembly includes quick disconnect plug local to assembly.

I. Outdoor (Condenser) Fan Assembly: The outdoor fan assembly consists of one backward curved plug fan with centrifugal blower wheel powered by an electronically commutated motor (ECM). The DC motor features brushless, permanently lubricated ball bearing construction for maintenance free operation. A wide range of programmable speeds and torque characteristics are possible for ultra-high efficiency and low audible noise. Fan design capable of overcoming external static pressures brought on by rear extensions backs and duct work connected to the fan discharge opening. Fan is sized such that powered exhaust shall be integral to the unit to prevent over pressurization of the space when the unit is introducing outside air. Capable of exhausting 100% equivalent of the fresh air intake of the unit. Electrical and control wiring to fan assembly includes quick disconnect plug local to assembly.

J. Mixed Air Filter: MERV 13, 2-inch(50-mm) thick pleated disposable filter.

K. Condenser Coil Filter: Wire framed reusable synthetic filter across inlet of outdoor coil.

L. Economizer: Full modulation spring return damper with blade and jam seals, to mix and control outdoor and return air flows. A minimum damper position setting shall be continuously maintain to meet outside air

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ventilation requirements based on fan speed. Low voltage modulating damper actuator with spring-return, fail safe. When power is cut to actuator, damper actuator will force damper blade closed to outside air.

M. Control Panel: Internally mounted control panel with control transformer, all necessary contactors, relays, and circuit breakers, with clearly identified components, terminal block positions, and wiring.

N. Microprocessor Controls: Programmable microprocessor controller designed to operate unit in an energy efficient manner using BacNet compatibility and operate unit in the following modes:

1. Free Cooling

2. Stage One Mechanical Cooling: 67% capacity compressor, low speed supply fan

3. Stage Two Mechanical Cooling: 100% capacity compressor, low speed supply fan

4. Stage Three Mechanical Cooling: 100% capacity compressor, high speed supply fan

5. Hot Water Heating: Low speed supply fan

O. Free Cooling Sequence: If the return air temperature is higher than the occupied set point and if the ambient air temperature is low enough to satisfy the cooling load in the occupied space, the microprocessor controller will signal the fresh air economizer damper. This will automatically modulate between 0-100% and the conditioned space temperature will be maintained by full fresh air or “free cooling”. During free cooling the outdoor fan will operate at reduced speed to match supply air volume.

The free cooling mode of operation leads to much reduced running time for the compressor leading to cost and equipment savings.Options:

1. BACnet Card: The factory Microprocessor Control includes a plug-in card allowing for complete compatibility with an MS/TP BACnet control system.

2. Occupancy Sensor: Include in controls package the ability to accept an external signal from room occupancy sensor to adjust unit operation as follows:

a. If sensor detects movement in the unoccupied mode, the unit shall switch to occupied mode.

b. If sensor detects no movement in the coverage area for an adjustable predetermined amount of time while in occupied mode, the unit shall switch to unoccupied mode.

3. CO2 Sensor: Unit mounted with measuring capability at plus or minus 40 ppm and 3% of reading accuracy.

a. On a rise over an adjustable predetermined setpoint, the controls shall proportionally adjust damper to allow a larger amount of outside air into the room.

4. Wall Mounted Digital Thermostat: Digital thermostat used in conjunction with the Factory Microprocessor Control displays current room temperature, cooling/heating set-point, current time and day, current occupied mode, and the unit’s compressor and fan speeds. The display will also display a remote alarm from the Microprocessor Control. Thermostat allows for occupied temperature set-point adjustment. The allowable set-point adjustment range can be limited by the Microprocessor Control. Thermostat allows for occupied override activation allowing user to select the amount of time the unit is to remain in the override state. Thermostat mounted remote from the unit.

5. Freeze Protection: Freeze protection sensor with manual reset to protect hot water coil by shutting down fan, opening hot water control valve, and closing damper to outside air flow.

6. Disconnect Switch: Power disconnect switch on control panel with off position lock out.

7. Outside Air Rear Extension: Factory supplied, field installed, 6 inch deep, cabinet extension, painted to match unit for non-standard outside air intake and exhaust air outlet locations.

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8. Hot Water Heating Coil, Control Valve, and Valve Package: Factory mounted copper tube with aluminum fin hot water coil located within unit, factory piped with control valve type (two or three way) as indicated, circuit setter, manual shut-off valves, strainer, and hose bibb drain.

9. Acoustic Duct Shroud Box: Factory supplied, field installed, 24 to 30 inch high (in two inch increments), acoustically lined duct shroud, painted to match unit with solid top.

10. Wall Sleeve: Factory supplied, field installed galvanized steel wall sleeve with separator plate(s) entire length of sleeve to separate outdoor air intake from exiting exhaust air.

P. Special attention should be given to units involving special metal trim filler enclosures between unit and walls. Any questions regarding special metal trim filler enclosures should be referred to the Architect/Engineer. Unit supplier shall furnish two metal trim filler pieces, 6 inches by 120 inches, the same finish color and sheet metal gauge as the unit enclosure. Unit installer shall field cut, fit, and bend trim filler pieces and provide necessary fasteners, caulk and other materials required for installation.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install units level and plumb, anchored to structure, in accordance with manufacturer's instructions, maintaining manufacturer's recommended clearances.

1. Arrange for a pre-installation meeting with manufacturers representative. Install one unit and get approval before installing remainder of units.

B. Install units with rubber gasket on floor and at wall junctures for vibration isolation.

C. Install wall sleeve between unit and louver. Caulk and seal exterior of sleeve as it passes through wall.

D. Install factory furnished field installed components in accordance with manufacturer’s requirements.

E. Coordinate with building controls Installer for installation of factory furnished remote mounted control components.

3.2 CONNECTIONS

A. Piping installation requirements are specified in other Division 23 Sections. Drawings indicate general arrangement of piping, fittings, and specialties.

1. Water Coil Connections: Comply with requirements in Division 23 Section "Hydronic Piping."

Connect to supply and return coil with shutoff-duty valve and union on the supply connection and with throttling-duty valve and union on the return connection.

2. Condensate Drain Connections: Connect unit condensate drain to outside building using copper tubing.

B. Install piping adjacent to unit to allow service and maintenance.

C. Duct Connections: Duct installation requirements are specified in Division 23 Section "Metal Ducts."

Drawings indicate the general arrangement of ducts. Connect supply ducts to units with flexible duct connectors. Flexible duct connectors are specified in Division 23 Section "Air Duct Accessories."

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1. Provide transition to exactly match unit duct connection size.

D. Ground equipment according to Division 26 Section "Grounding and Bonding for Electrical Systems."

E. Electrical Connections: Comply with requirements in Division 26 Sections for power wiring.

1. Coordinate location of electrical junction box with unit’s power lead extension.

3.3 FIELD QUALITY CONTROL

A. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect field-assembled components and equipment installation, including connections, and to assist in field testing.

Report results in writing.

B. Perform the following field tests and inspections and prepare test reports:

1. Leak Test: After installation and test for leaks. Repair leaks and retest until no leaks exist.

2. Operational Test: After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation.

3. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

C. Remove and replace malfunctioning units and retest as specified above.

3.4 STARTUP SERVICE

A. Engage a factory-authorized service representative to perform startup service.

1. Complete installation and startup checks according to manufacturer's written instructions.

B. Occupancy Adjustments: When requested within 12 months of date of Substantial Completion, provide on-site assistance in adjusting system to suit actual occupied conditions. Provide up to two visits to site outside normal occupancy hours for this purpose.

3.5 DEMONSTRATION

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain units. Refer to Division 01 Section "Demonstration and Training."

END OF SECTION 23 8221