Summary of Contents for United CoolAir Alpha Aire II - Gen II
- Page 1 Alpha Aire II - Gen II Installation Operation and Maintenance Manual Effective January 2025 Dedicated Outdoor Air System, Air-Source, Heat Pump with Energy Recovery Horizontal Air Cooled Unit Refrigerant R-454B...
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Page 2: Table Of Contents
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Table of Contents BACnet Point List ............. 25 Safety Introduction and Labeling Guide ......3 Product Compliance Statements ........3 System Options ..............29 R-454B Refrigerant Information .......... 4 Painted Cabinet ..............29 Labeling on Units .............. -
Page 3: Safety Introduction And Labeling Guide
For detailed information regarding specifications, dimensional drawings, and weight information, contact DANGER your local United CoolAir representative. The danger icon indicates presence of a hazard condition that may result in equipment damage, serious bodily injury, or death. -
Page 4: R-454B Refrigerant Information
Installation, Operation and Maintenance Manual Alpha Aire II Gen II R-454B Refrigerant Information IMPORTANT This equipment is supplied with R-454B, which is a low global warming potential, A2L refrigerant. All A2L This equipment must be installed in a refrigerants are considered “mildly flammable”, and extra location that is not accessible to the precaution is required during installation and service. - Page 5 Installation, Operation and Maintenance Manual Alpha Aire II Gen II WARNING WARNING Leak detection system installed; 1. Flammable refrigerant used. to be continuous air circulation required for repaired only by trained service personnel. proper functioning. Units must be powered do not puncture refrigerant tubing. except for service.
- Page 6 Installation, Operation and Maintenance Manual Alpha Aire II Gen II WARNING IMPORTANT / IMPORTANTE Système de détection de fuites installé, ONLY USE OILS APPROVED FOR THE circulation d’air continue nécessaire au bon COMPRESSOR. fonctionnement. L’unité doit être alimentée sauf pour l’entretien. CHECK MANUFACTURER’S Cet appareil est équipé...
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Page 7: Labeling On Units
Installation, Operation and Maintenance Manual VariCool EZ-Fit Labeling on Units Units may contain any of the following pictograms for safety and awareness. When you see any of these pictograms and their meanings as your safety is important. Unit Label Description Refrigerant Safety Group A2L Read this technical manual for installation/servicing instructions. -
Page 8: Electrical Diagram
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Electrical Diagram To retrieve the unit electrical diagram, scan the electrical diagram QR Code label affixed near the unit data tag. This will link to the https://www.unitedcoolair.com website. Scroll down to the Search By Serial Number box and enter the unit serial number. -
Page 9: General Information
Installation, Operation and Maintenance Manual Alpha Aire II Gen II General Information The Alpha Aire II is a single package air source heat pump delivered to another location, or possibly within the unit. If designed for 100% Outdoor Air applications with energy shipped with the unit there will be a sticker that identifies recovery, making it an environmentally friendly and where in the unit the shipped loose items are located. -
Page 10: Ceiling Unit Mounting
Installation, Operation and Maintenance Manual Alpha Aire II Gen II B. Required service clearances. Service clearances certain to install field supplied vibration isolator-type must be adhered to on ALL SIDES. mounts as required. C. Condensate removal, trapping and disposal. 5. Tighten all mounting hardware and level as required. D. -
Page 11: Mounting And Placement
Filters must be provided on all air inlet streams quantity 2 each on outdoor air intake and return air intake. United CoolAir recommends a MERV 13 filter to be utilized. Dependent upon the air quality there may also be other requirements for the treatment of the incoming air, such as the ozone level. -
Page 12: Indoor Air Quality
Installation, Operation and Maintenance Manual Alpha Aire II Gen II General Ductwork Recommendations Figure 3 below is an acceptable construction for an inlet hood, while Figure 6 is not acceptable. 1. Please make sure that all ductwork is connected to the units using field supplied flexible duct connectors. -
Page 13: Louver Selection
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Louver Selection Rows Subcooling Coil Carefully choosing the right intake/exhaust louvers and determining the best location for them are critical Rows components to a successful installation. Hot Gas Reheat Coil 1. -
Page 14: Dimensions Drawings
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Dimensional Drawing Subject to change without notice. -
Page 15: Isometric Drawings
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Isometric Views Subject to change without notice. -
Page 16: Installation
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Installation 9. Unit contains a full charge of R-454B refrigerant from the factory. Recommended Assembly Sequence 10. Line up the evaporator and ERW/compressor box sections. Secure sections using factory provided full- Find the shipped loose components: length tie rails and ensure there are no gaps between •... - Page 17 Installation, Operation and Maintenance Manual Alpha Aire II Gen II Side View Bottom View Subject to change without notice.
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Page 18: Refrigerant Quick Connect Fittings
Installation, Operation and Maintenance Manual Alpha Aire II Gen II 13. Refer to the Refrigerant Quick Connect Fittings section. Inside the evaporator section, connect the resealable refrigerant quick fittings between the evaporator section and compressor compartment. 14. Inside the condenser section, connect the resealable refrigerant quick fittings between condenser section and compressor compartment. -
Page 19: Electrical And Controls
Installation, Operation and Maintenance Manual Alpha Aire II Gen II the evaporator drain pan or to cause the unit to shut down on the drain pan overflow safety. INFORMATION The "A" dimension (reference figure below) must equal or Use Copper Conductors Only. Failure exceed the negative static pressure developed by the to use copper conductors may result in supply air blower. -
Page 20: Field Electrical Termination Points
Installation, Operation and Maintenance Manual Alpha Aire II Gen II 21. Units are completely internally wired at the factory. 22. All units are provided with terminal blocks. 23. Check the unit data tag for the required voltage, minimum circuit ampacity and maximum fuse size. 24. -
Page 21: Alphaaire Ii Sequence Of Operation
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Alpha Aire – Sequence of Operation the Supply Air Dew Point Set Point 55°F (adjustable) Dehumidification takes priority over cooling and heating modes. System Start/Stop Reheat Mode The system is on when all enable points are set to the on position: During dehumidification... -
Page 22: Factory Installed Sensors
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Controller Operation Factory Installed Sensors Figure 11 – Marvel Premium Wall Display Display Terminal Operation Alarm Button Use the Alarm Button to access any active alarms. This button will illuminate Red when an alarm is active. Figure 10 –... -
Page 23: Alarms
Installation, Operation and Maintenance Manual Alpha Aire II Gen II end switch closes, the supply and exhaust Alarms fans will start and ramp to meet the CFM set Global Alarm point. When any alarm is present, the red LED will flash 2. -
Page 24: Bacnet Setup
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Clearing Active Alarms To clear active alarms, hold the up arrow button to access the active alarm(s). Then use the right arrow button to navigate to the alarm reset screen. Press the OK button on the Reset Alarms button to reset active alarms. -
Page 25: Bacnet Point List
Installation, Operation and Maintenance Manual Alpha Aire II Gen II ALPHA AIRE II Gen. II – BACnet POINTS LIST Analog Values Index Variable/BACnet Name Description Access Minimum Maximum Units OutdoorTemperature Outdoor Temperature -999.9 999.9 Degrees Fahrenheit OutdoorHumidity Outdoor Humidity -999.9 999.9 Percent Relative Humidity EvaporatorTemperature... - Page 26 Installation, Operation and Maintenance Manual Alpha Aire II Gen II ALPHA AIRE II Gen. II – BACnet POINTS LISTcontinued Binary Values Index Variable/BACnet Name Description Access Minimum Maximum Units SystemOnOff System ON/OFF OutdoorAirDamper Outdoor Air Damper Status Closed Open SupplyBlower Supply Air Blower Status Compressor_1 Compressor 1 ON/OFF Status...
- Page 27 Installation, Operation and Maintenance Manual Alpha Aire II Gen II ALPHA AIRE BACnet POINTS LIST – Gen. II continued Multistate Values Index Variable/BACnet Name Description Access Minimum Maximum Multistate Value MultiState Status BMS - Mode Disabled/OFF BMS - Unit OFF BMS_ModeSelection BMS Mode Input Selector BMS - Unit ON...
- Page 28 Installation, Operation and Maintenance Manual Alpha Aire II Gen II ALPHA AIRE II Gen. II – BACnet POINTS LIST continued Integer Values Index Variable/BACnet Name Description Access Minimum Maximum Units SupplyAirflowSetpoint Supply Airflow Setpoint 2500 ExhaustAirflowSetpoint Exhaust Airflow Setpoint 2500 SupplyAirflow Current Supply Airflow 9999...
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Page 29: System Options
Installation, Operation and Maintenance Manual Alpha Aire II Gen II System Options Painted Cabinet (Exterior Only) A Polyurethane Enamel electrostatically sprayed on heavy duty G60 steel components. It is a two-component coating providing high gloss, excellent exterior durability with chemical resistance properties along with high volume solids and low VOC. -
Page 30: Refrigerant Circuit Components
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Refrigerant Circuit Component Sight Glass dehumidification mode and the air temperature leaving A liquid sight glass is installed the liquid line between the the evaporator coil is less than the set point the control outlet of the liquid receiver and the inlet of the opens the hot gas reheat valve to reject heat energy back thermostatic expansion valve. -
Page 31: R-454B Guidelines
Installation, Operation and Maintenance Manual Alpha Aire II Gen II R-454B Guidelines DANGER WARNING – A2L Refrigerant LOCKOUT/TAGOUT all power sources This unit contains R-454B which is a class prior to servicing this appliance. This A2L refrigerant that is Flammable. This appliance is provided with a Refrigerant unit should only be installed, serviced, Leak Detection system and components... -
Page 32: Minimum Room Area
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Minimum Room Area At least 50% of the minimum opening area shall be • below 200mm from the floor. Since this unit contains R-454B an A2L Refrigerant, the Openings are permanent openings which cannot be •... - Page 33 Installation, Operation and Maintenance Manual Alpha Aire II Gen II NOTE: Reference the refrigerant charge per the largest refrigerant circuit from the unit data tag. TAmin TAmin TAmin TAmin (lbs) (ft^2) (kg) (m^2) (lbs) (ft^2) mc (kg) (m^2) 73.6 66.0 791.7 132.0 12.3...
- Page 34 Installation, Operation and Maintenance Manual Alpha Aire II Gen II Required Minimum Room Area (m²) y = 13.514x + 2E-13 10.0 12.0 14.0 16.0 18.0 Refrigerant Charge per Circuit From Dataplate (kg) Figure – 14 Refrigerant charge (kg) vs. required conditioned space area (m Required Minimum Room Area (ft²) y = 65.979x 2400...
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Page 35: Minimum Installation Requirements
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Minimum Installation Requirements installation, repairing, removing and disposal, during which refrigerant can possibly be released to the surrounding space. Prior to work taking place, the area Minimum Installation Height around the equipment is to be surveyed to make sure that The minimum installation height shall be the greater of there are no flammable hazards or ignition risks. -
Page 36: Repairs To Sealed Components
Installation, Operation and Maintenance Manual Alpha Aire II Gen II corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be used. NOTE: The use of silicon sealant can inhibit the This shall be reported to the owner of the equipment so effectiveness of some types of leak detection all parties are advised. -
Page 37: Removal And Evacuation
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Removal and evacuation Hoses or lines shall be as short as possible to • minimize the amount of refrigerant contained in When breaking into the refrigerant circuit to make repairs them. -
Page 38: Labeling
Installation, Operation and Maintenance Manual Alpha Aire II Gen II g) Start the recovery machine and operate in ignition in the event of a refrigerant release. Consult accordance with instructions. manufacturer if in doubt. h) Do not overfill cylinders (no more than 80 % The recovered refrigerant shall be returned to the volume liquid charge). -
Page 39: Leak Detection And System Mitigation
Refrigerant Detection System (RDS) automatically. All United CoolAir HVAC products with an A2L Refrigerant, and exceeding a charge limit, must have a RDS Sequence method for detecting refrigerant leaks using a Refrigerant Detection System (RDS). A2L refrigerants are mildly A2L Sensors are used for detection of refrigerant leaks. -
Page 40: Rds System Manual Test
Installation, Operation and Maintenance Manual Alpha Aire II Gen II compartment into a negative pressure allowing air to flow 1. Supply Fan shall run at a preset minimum speed through the compartment from an equipment room or (VAV) or full speed (CAV). outdoor air path to infiltrate and dilute the compartment 2. -
Page 41: Maintenance Procedures
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Maintenance Procedures To keep the unit operating safely and efficiently, it is recommended that a qualified service technician check WARNING the entire system at least once a year. Check the system more frequently depending on use and surrounding EXPLOSION HAZZARD conditions. -
Page 42: Evaporator And Condenser Coils
Installation, Operation and Maintenance Manual Alpha Aire II Gen II INFORMATION WARNING After installation and during equipment startup, the sight glass may appear Pink or Make sure to follow all safety precautions Purple. This occurs during prolonged when cleaning any coil with a commercially periods of non-operation and should turn available coil... -
Page 43: Product Overview
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Energy Recovery Wheels Product Overview About Airxchange Energy Recovery Wheels Unless noted, the information in this manual applies to all available models of Airxchange energy recovery wheels. Energy recovery wheels rotate between the incoming outdoor air stream and the building exhaust air stream. - Page 44 Installation, Operation and Maintenance Manual Alpha Aire II Gen II Overview Of Wheel Components Identify Cassettes with Serial Number All Airxchange wheels are labeled with Model, Serial, and Refer to Figure 18 and the list below for the high level Part numbers.
- Page 45 Installation, Operation and Maintenance Manual Alpha Aire II Gen II Operating Instructions Pre-Startup Motor Guidelines Note the following for proper motor function: • Always follow motor manufacturers’ wiring instructions. • All wheels should rotate clockwise when viewed from Figure 20 Setting diameter seals.
- Page 46 Installation, Operation and Maintenance Manual Alpha Aire II Gen II Inspection Before starting the system, confirm the following: • Wheel spins freely by hand in a clockwise direction, with no interference noise. • Wheel is not “racked” (wheel rotates parallel to bearing beams).
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Page 47: Post-Startup Inspection
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Post-Startup Inspection After applying power to system, confirm the following: • Verify that the wheel is rotating in the direction of the rotation arrow located on cassette frame. • On 3-phase motors, if the wheel does not rotate in the direction of the arrow, shut off the power to the system and interchange any two power supply leads to reverse rotation. -
Page 48: Troubleshooting
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Troubleshooting Guide Turn OFF power to unit before conducting any troubleshooting, unless the tests ELECTRICAL you are performing require system operation. Keep hands, clothing and tools clear HAZARD of electrical terminals. Make sure to keep hands and clothing clear of any moving belts, blowers and WARNING motors while performing any tests. - Page 49 Installation, Operation and Maintenance Manual Alpha Aire II Gen II Ensure TXV Bulb tight on piping and located Expansion valve stuck open correct position. Worn or scarred compressor bearings. Check subcooling and superheat. Noisy Compressor Excessive head pressure. Replace compressor. Broken compressor valves.
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Page 50: Important Notice
United CoolAir, LLC. Failure to conform to such specifications and/or instructions shall void this 9. Damages resulting from: (I) freezing of condensate;... -
Page 51: To Obtain Warranty Service
United CoolAir does not assume or authorize any other person to assume for United CoolAir, any other liability for the sale of this product. Model: _________________________ Serial Number: _______________________ Date of Installation: ____________... -
Page 52: Start-Up Procedures
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Start-Up Procedures (R-454B Systems) 10. Verify that the filters are in place, clean and usable. ELECTRICAL HAZARD 11. Apply power to the unit. Switch the circuit breaker or field supplied electrical service disconnect Turn OFF power and lockout service switch to the on position. - Page 53 Installation, Operation and Maintenance Manual Alpha Aire II Gen II 22. Using an appropriate pressure / temperature chart for R-454B refrigerant, look up and record the b. Make sure Compressor Current (amps) is below saturation temperature corresponding to the liquid the RLA Amps listed on the unit data tag.
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Page 54: Start-Up Form
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Alpha Aire II Startup Form Please complete the form including contact, start-up date and all request information. Provide a copy to the customer and local distributor. Job Name: Date: Address: City: State: Zip:... - Page 55 Installation, Operation and Maintenance Manual Alpha Aire II Gen II Alpha Aire II Startup Form Continued Saturation Temperature °F Suction Superheat ° Discharge Pressure psig Liquid Line Temperature °F Saturation Temperature °F Liquid Subcooling ° Electrical Supply Blower Motor Current amps amps Exhaust Blower Motor Current...
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Page 56: R-454B Pressure / Temperature Chart
Installation, Operation and Maintenance Manual Alpha Aire II Gen II R-454B Refrigerant Pressure Temperature Chart (Imperial) °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG 70.3 122.3 195.5 295.1 427.4 71.9 124.6 198.7 299.4 433.0 73.5 127.0 201.9 303.7 438.7 75.2 129.3... - Page 57 R-454B Refrigerant Pressure Temperature Chart (Metric) °C PSIG °C PSIG °C PSIG °C PSIG °C PSIG -6.7 484.7 843.2 23.3 1347.9 38.3 2034.6 53.3 2946.8 -6.1 495.7 859.1 23.9 1370.0 38.9 2064.3 53.9 2985.4 -5.6 506.8 875.6 24.4 1392.1 39.4 2093.9 54.4 3024.7...
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Page 58: Nomenclature
Installation, Operation and Maintenance Manual Alpha Aire II Gen II Product Nomenclature EXAMPLE: “AA” = Alpha Aire “H” “H” = Horizontal “2##” 2 = Series and ## = Tonnage “G” G = Common to all “2”, “3”, “4” 2 = 208 Volts, 3 = 230 Volts, 4 = 460 Volts “AS”... -
Page 59: Maintenance Log
This log must be kept with the unit. It is the responsibility of the owner and/or maintenance/service contractor to document any service, repair or adjustments. United CoolAir Service and Warranty Departments are available to advise and provide phone help for proper operation and replacement parts. The responsibility for proper startup, maintenance and servicing of the equipment falls to the owner and qualified licensed HVAC technician. - Page 60 Installation, Operation and Maintenance Manual Alpha Aire II Gen II NOTES: Subject to change without notice.
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Page 61: Appendix
Appendix Subject to change without notice. -
Page 62: Electrical Diagram
Subject to change without notice. - Page 63 Subject to change without notice.
- Page 64 Subject to change without notice.
- Page 65 UCA.IOM.AAII_GenII Date: 01/30/25 Revision – A UCA PN: 9CAIOMAAIIGII...
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