Related Manuals for United CoolAir OmegaAir OS Series
Summary of Contents for United CoolAir OmegaAir OS Series
- Page 1 OmegaAir Series Installation Operation and Maintenance Manual Effective April 2025 Vertical and Horizontal Water Cooled and Air Cooled Refrigerant R-454B...
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Page 2: Table Of Contents
Installation, Operation and Maintenance Manual OmegaAir Table of Contents Safety Introduction and Labeling Guide ......3 Controls Quick Start ............26 Product Compliance Statements ........3 Alarms ................27 R-454B Refrigerant Information .......... 4 BACnet Setup ..............28 Labeling on Units ..............7 System Options .............. -
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 OmegaAir 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 OmegaAir WARNING WARNING Leak detection system installed; continuous air circulation required for 1. Flammable refrigerant used. to be proper functioning. Units must be powered repaired only by trained service personnel. except for service. do not puncture refrigerant tubing. This unit is equipped with electrically 2.
- Page 6 Installation, Operation and Maintenance Manual OmegaAir 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 de mesures de LITERATURE FOR COMPATIBILITY.
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Page 7: Labeling On Units
Installation, Operation and Maintenance Manual 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 OmegaAir 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 Location Inspection of Equipment CAUTION United CoolAir has run tested this equipment at the Required minimum installation area due to factory and has taken photographs post testing for A2L refrigerant (R-454B). Refer to Minimum verification and reference in case of any damage incurred Installation Area page 29 for requirements. -
Page 10: Outdoor Air Quality
United CoolAir recommends a MERV 8 or better filter to be utilized. Dependent upon the air quality there may also be other Figure 1 - Acceptable Figure 2 –... -
Page 11: Duct Design
Installation, Operation and Maintenance Manual OmegaAir 62.1-2004. Research continues as to the concentration of maintenance on the unit. The frame will also need to smoke that provides a reasonable or acceptable risk to be designed with suitable cross bracing. (Figure 3). occupants. -
Page 12: Service Clearances
Installation, Operation and Maintenance Manual OmegaAir Sufficient height elevation must be available to provide prevailing wind direction can adversely affect the potential the required condensate trap. for recirculation and should be factored into louver placement. 1. Do not remove the unit support rails. In some areas, local codes dictate louver location. -
Page 13: Length Of Ductwork For Discharge Aire
Installation, Operation and Maintenance Manual OmegaAir 7. All louver manufacturer instructions, local codes, and industry accepted guidelines must be followed for all installations. The intake and discharge louver can be in separate frames or combined in one frame Figure 8 – Sloping the Intake / Discharge Duct for Proper Drainage Length of Ductwork for Discharge Air The unit should be located a minimum distance from the... -
Page 14: Louver Selection
Installation, Operation and Maintenance Manual OmegaAir Application / Physical Data Design Minimum Maximum Voltage Water Flow GPM / Ton Drybulb 65.0°F 110.0°F OA Entering Evaporator Wetbulb 57.0°F 72.0°F Entering 50.0°F 100.0°F Water Temperature Leaving 100.0°F 48.9°C Suction 100psig 155psig Refrigerant Working Pressures Discharge 260psig... -
Page 15: Product Dimensional Information
Installation, Operation and Maintenance Manual OmegaAir Product Dimensional Information Subject to change without notice. -
Page 16: Installation
Installation, Operation and Maintenance Manual OmegaAir Installation It is highly recommended that the trap be primed with water prior to unit start-up. General Ductwork Recommendations Each trap must be piped to a suitable waste drain. 1. Please make sure that all ductwork, outside air inlet and supply air and for air-cooled units the condensing section inlet and discharge air, is connected to the units using field-supplied flexible duct connectors. -
Page 17: Water Requirements
The field must verify the proper GPM supply to the unit. Do not reduce the water inlet or outlet NOTE: United CoolAir DOES NOT APPROVE of the connection size as this will restrict water use of potable water with this product. -
Page 18: Electrical
Installation, Operation and Maintenance Manual OmegaAir IMPORTANT INFORMATION Units have been tested at the factory before shipment. The test fluid at the Water-cooled units with a glycol cooling factory contains a glycol mixture. It is fluid will require a higher GPM / Ton flow important to flush the internal unit piping rate. -
Page 19: Calculating Mca And Mop
Installation, Operation and Maintenance Manual OmegaAir Calculating MOP INFORMATION MOP Cooling = (2.25 x Load 1) + Load 2 Unit wiring and components have been MOP Heating = Load 2+ Load 3 designed for the specific unit application and factory assigned controls. Do not use the MOP = Maximum value between MOP Heating &... -
Page 20: Wall Display
Installation, Operation and Maintenance Manual OmegaAir The maximum desirable voltage unbalance is 2 0%. IP/Ethernet). Refer to the Marvel Premium controller When testing for voltage unbalance, the phase-to-phase installation instructions for BMS integration. voltages should be measured rather than the phase-to- neutral voltages since 3-phase motors are connected Field Electrical Termination Points across phases. - Page 21 Installation, Operation and Maintenance Manual OmegaAir Figure 13 – Supply Temperature Sensor Figure 15 – Remote Start/Stop Smoke Detector (Field-Supplied / Field-Installed) Water Flow Switch Installation The Smoke Detector is field-supplied, field-installed (Field-Supplied / Field-Installed) device to shut down the unit in the event of smoke detection in the ductwork.
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Page 22: Pressure Switches
Installation, Operation and Maintenance Manual OmegaAir Low Voltage Wiring Install the field provided water flow switch in the MAIN water pipe supplying condenser water to the building, close to the unit’s supply branch, to accurately reflect flow conditions in the main line (Figure 17) INFORMATION Pressure Switches Make sure to use the appropriate gauge of... - Page 23 Installation, Operation and Maintenance Manual OmegaAir refrigerant lines based on line length and elevation differences. Disconnect the resealable fittings that INFORMATION were temporarily installed in step 1 above. On units with more than one refrigerant 4. Install the Schrader valve fittings into the tubing circuit, be careful not to intermix liquid, before brazing the couplings onto the ends of the suction and/or hot gas lines of the various...
- Page 24 Installation, Operation and Maintenance Manual OmegaAir Line Size Wrench Size Full Turns Required 3/8” 1-3/16” 1/2” 1-3/16” 5/8” 1-5/8” 7-3/4 3/4" 1-5/8” 7-3/4 7/8” 1-5/8” 1-1/8" 2” Table 1 – Resealable Fitting Number of Turns 9. Refrigerant piping shall be insulated in accordance with local codes...
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Page 25: System Options
Refer to Marvel Hot Water Coil Valves Premium instructions Hot water valves, if supplied by United CoolAir, are Drain Pan Overflow Switch typically 2-way. The optional valves are shipped loose for installation in the field. The valves are to be mounted in This device will be activated in the event that condensate the outlet line of the coil. -
Page 26: Modes Of Operation
Installation, Operation and Maintenance Manual OmegaAir Controller Operation Modes of Operation Dehumidification Mode Dehumidification is based on the entering Outdoor Air Dew Point and Supply Air Dew Point Set Point. If the Outdoor Air Dewpoint is greater than the Supply Air Dew Point Set Point, Dehumidification Mode is active. -
Page 27: Alarms
Installation, Operation and Maintenance Manual OmegaAir Alarms 2.1. All set points are found under the Set Points section of the Main Menu, Global Alarm 2.2. Dew Point Set Point: The factory dew point set When any alarm is present, the red LED will flash point is 55°F. -
Page 28: Bacnet Setup
Installation, Operation and Maintenance Manual OmegaAir is constant during the compressor operation, it may be an indication the unit is short of refrigerant. BACnet Setup All BACnet MS/TP communication parameters are Thermostatic Expansion Valve adjustable under the BMS Setup section of the Main The Maximum Operating Pressure (MOP) or pressure Menu. - Page 29 Installation, Operation and Maintenance Manual OmegaAir • Organic Growths: Slime and algae which Scale Formation: Mineral deposits which result • form under certain environmental conditions, and from the crystallization and precipitation of can reduce the heat transfer rate by forming an dissolved salts in the water.The deposits form an insulating coating or can promote corrosion by insulating barrier, reducing the heat transfer rate...
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Page 30: R454B Guidelines
Installation, Operation and Maintenance Manual OmegaAir 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 repaired, and disposed of by qualified... -
Page 31: Minimum Room Area
Installation, Operation and Maintenance Manual OmegaAir Minimum Room Area • Openings are permanent openings which cannot be closed. Since this unit contains R-454B an A2L Refrigerant, the • For openings extending to the floor the height served indoor space must be larger or equal to the shall not be less than 20 mm above the surface Minimum Room Area as shown in Table 4. -
Page 32: Minimum Floor Area
Installation, Operation and Maintenance Manual OmegaAir Minimum Floor Area (lbs) TAmin (ft (kg) TAmin (m (lbs) TAmin (ft (kg) TAmin (m 73.6 66.0 791.7 12.3 79.7 132.0 857.7 18.4 85.8 197.9 923.7 24.5 91.9 263.9 989.7 30.6 98.1 329.9 1055.7 36.8 104.2 395.9... -
Page 33: Minimum Rated Air Flow
Installation, Operation and Maintenance Manual OmegaAir Minimum Rated Air Flow Tonnage Minimum CFM Tonnage Minimum CFM 1000 1000 13.5 1100 1350 Minimum cfm is based on 150 ft/min coil face velocity and does not take into consideration conditions. Higher air flows may be necessary to avoid coil frosting or tripping suction pressure switch. - Page 34 Installation, Operation and Maintenance Manual OmegaAir Minimum Room Area 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 16 – 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 OmegaAir Minimum Installation Requirements 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 there are no flammable hazards or ignition risks. -
Page 36: Repairs To Sealed Components
Installation, Operation and Maintenance Manual OmegaAir This shall be reported to the owner of the equipment so equipment. Intrinsically safe components do not all parties are advised. have to be isolated prior to working on them. Cabling Initial safety checks shall include: •... -
Page 37: Charging Procedures
Installation, Operation and Maintenance Manual OmegaAir be used. However, for flammable refrigerants it is • Ensure that the refrigerating system is earthed important that best practice is followed since flammability prior to charging the system with refrigerant. is a consideration. •... -
Page 38: Labeling
Installation, Operation and Maintenance Manual OmegaAir When the cylinders have been filled correctly and If compressors or compressor oils are to be removed, the process completed, make sure that the ensure that they have been evacuated to an acceptable cylinders and the equipment are removed from level to make certain that FLAMMABLE REFRIGERANT site promptly and all isolation valves on the does not remain within the lubricant. -
Page 39: Leak Detection And Mitigation System
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 OmegaAir through the compartment from an equipment room or 2. Where applicable, dampers inside the unit for outdoor air path to infiltrate and dilute the compartment mitigation shall open to move air through otherwise with air which then exits through the damper into the sealed compartments. -
Page 41: Maintenance Procendures
Installation, Operation and Maintenance Manual OmegaAir 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 OmegaAir 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: Troubleshooting Guide
Installation, Operation and Maintenance Manual OmegaAir 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 44 Installation, Operation and Maintenance Manual OmegaAir 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. Reduce Head Pressure. Liquid slugging.
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Page 45: 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 46: 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 47: Startup Procedures
Installation, Operation and Maintenance Manual OmegaAir 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 48 Installation, Operation and Maintenance Manual OmegaAir 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. line pressure.
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Page 49: Startup Form
Installation, Operation and Maintenance Manual OmegaAir OmegaAir 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: Unit Model Number: Unit Serial Number: Screw Lugs &... - Page 50 Installation, Operation and Maintenance Manual OmegaAir OmegaAir Startup Form (continued) Compressor 1 Compressor 2 Suction Pressure psig psig Suction Line Temperature °F °F Saturation Temperature °F °F Suction Superheat ° ° Discharge Pressure psig psig Liquid Line Temperature °F °F Saturation Temperature °F °F...
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Page 51: Refrigerant Pressure Temperature Chart
Installation, Operation and Maintenance Manual OmegaAir 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 75.2 129.3 205.2 308.0 444.5 76.8... - Page 52 Installation, Operation and Maintenance Manual OmegaAir 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...
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Page 53: Product Nomenclature
Installation, Operation and Maintenance Manual OmegaAir Product Nomenclature EXAMPLE: “OS” Outdoor Air “W” Water Cooled “A” Air Cooled “H” Horizontal Configuration “V” Vertical Configuration “3”, “4”, “5”, “6”, “7”, “8”, “9”, “10”, “11”, “12”, “13.5”, “15” Nominal Tons Common to all “1”, “2”, “3”, “4”... -
Page 54: Maintenance Logs
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 55 Installation, Operation and Maintenance Manual OmegaAir NOTES: Subject to change without notice.
- Page 56 Installation, Operation and Maintenance Manual OmegaAir NOTES: Subject to change without notice.
- Page 57 Installation, Operation and Maintenance Manual OmegaAir NOTES: Subject to change without notice.
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Page 58: Electrical Diagrams
Installation, Operation and Maintenance Manual OmegaAir SAMPLE - For reference only Subject to change without notice. - Page 59 Installation, Operation and Maintenance Manual OmegaAir SAMPLE - For reference only Subject to change without notice.
- Page 60 Installation, Operation and Maintenance Manual OmegaAir UCA_IOM_OMEGAAIR Date: 04/07/25 Revision – A UCA PN: 9CAIOMOMEGA...
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