United CoolAir VariCool EZ-Fit Series Installation, Operation And Maintenance Manual
Variable air volume water-cooled, water source heat pump refrigerant r-454b
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Summary of Contents for United CoolAir VariCool EZ-Fit Series
- Page 1 VariCool EZ-Fit Series ® Installation Operation and Maintenance Manual Effective January 2025 Variable Air Volume Water-Cooled, Water Source Heat Pump Refrigerant R-454B...
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Page 2: Table Of Contents
Installation, Operation and Maintenance Manual VariCool EZ-Fit Table of Contents Safety Introduction and Labeling Guide ......3 Minimum Installation Requirements ......... 37 Product Compliance Statements ........3 Minimum Installation Height ..........37 R-454B Refrigerant Information .......... 4 Equipment Servicing ............37 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 VariCool EZ-Fit 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 VariCool EZ-Fit WARNING WARNING 1. Flammable refrigerant used. to be Leak detection system installed; repaired only by trained service personnel. continuous air circulation required for do not puncture refrigerant tubing. proper functioning. Units must be powered 2.
- Page 6 Installation, Operation and Maintenance Manual VariCool EZ-Fit 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 VariCool EZ-Fit 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
This equipment should NOT be installed in a space subject to freezing temperatures. United CoolAir has run tested this equipment at the factory and has taken photographs post testing for verification and reference in case of any damage incurred Installation Location during transportation, handling or rigging. -
Page 10: Product Specifications
Installation, Operation and Maintenance Manual VariCool EZ-Fit D. Location of wiring and safety devices. H. Water piping location and connection configuration. E. Ductwork sizing and connections are per industry An EZ-Fit Frame Cart is available to verify the largest standards. cabinet size. -
Page 11: Service Clearances
Installation, Operation and Maintenance Manual VariCool EZ-Fit Service Clearances Notes: (a) Service clearances only apply to all air path configurations. (b) Service clearances apply to all size units. Subject to change without notice. -
Page 12: Condensate Drain
Installation, Operation and Maintenance Manual VariCool EZ-Fit Condensate Drain Each EZ-Fit evaporator has a condensate drain connection in the base frame (Ref. Figure 2). If the application contains dual modules two (2) drain traps are required. Traps will need to be connected to the 1-1/4” NPT drain connection(s) (Ref. -
Page 13: Physical Data
Installation, Operation and Maintenance Manual VariCool EZ-Fit Physical Data Single Module Blower Type Filter Size Evap Coil Nominal Compressor R-454B Tons lbs / ckt iDDP DWDI Size (inches) Rows 4 / 2 15x20 / 20x20 18x25 10.8 18x25 11.8 6 / 3 20x20 / 20x24 2 / 5 / 2 20x20 / 20x24 / 24x24... -
Page 14: Dimensions And Weights
Installation, Operation and Maintenance Manual VariCool EZ-Fit Dimensions and Weights Assembled Unit Single Module Dual Module Dimensions in Inches Unit Weight Dimensions in Inches Unit Weight Nominal Nominal Tons Tons iDDP DWDI iDDP DWDI 110-1/2 49-5/8 88-1/8 3720 3350 3300 55-1/2 49-5/8 88-1/8... - Page 15 Installation, Operation and Maintenance Manual VariCool EZ-Fit Dimensions and Weights Dual Module Condensing Section (Each) Evaporator Section (Each) Fan Section (Each) Nominal Tons 55-1/2 32-1/4 55-1/2 17-1/4 55-1/2 49-5/8 40 - 50 65-1/2 34-3/4 1075 65-1/2 17-1/4 65-1/2 52-1/8 70-1/2 34-3/4 1340 70-1/2...
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Page 16: Mounting And Placement
Installation, Operation and Maintenance Manual VariCool EZ-Fit Mounting and Placement Mounting Options 3. Waffle Pads Only - If cabinet height prevents adequate space for framing, waffle pads alone may be used, reference Figure 4E. It is highly recommended that When installing any floor mounted unit, some form of each pad be of identical height and that the pads are vibration isolation is required. - Page 17 Installation, Operation and Maintenance Manual VariCool EZ-Fit Figure 4E - Base Option 3 - Waffle Pads Only - Bottom View Figure 4C - Base Option 2 - Channel Steel w/ Waffle Pads - Bottom View Figure 4F - Base Option - Unit View - Single Module Figure 4D - Base Option 2 - Unit View - Single Module Subject to change without notice.
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Page 18: Assembly Sequence
Installation, Operation and Maintenance Manual VariCool EZ-Fit Assembly Sequence - Recommendations A aligns to A B aligns to B C aligns to C 1. Set Evaporator section in place. D aligns to D 2. Set Compressor / Condensing section in place. a. -
Page 19: Resealable Refrigerant Fittings
Installation, Operation and Maintenance Manual VariCool EZ-Fit An insulation piece is factory installed between the module sections to seal any possible air leakage where the water piping passes through the cabinets. Cut a hole in the insulation to feed both the inlet and outlet water piping through. -
Page 20: 3D-Intelliclamps
Installation, Operation and Maintenance Manual VariCool EZ-Fit 3D-Intelliclamps INFORMATION Each section of a single module is furnished with Count the number of threaded rotations. Use 3D-Intelliclamps to facilitate connection to the adjacent Table 2 to determine how many total section. These have been installed at the factory during rotations are required for proper sealing of production and consist of two interlocking halves that mate the fittings. - Page 21 Installation, Operation and Maintenance Manual VariCool EZ-Fit Figure 7A – Single Module Subject to change without notice.
- Page 22 Installation, Operation and Maintenance Manual VariCool EZ-Fit Figure 7B – Dual Module Subject to change without notice.
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Page 23: Blower Section
Installation, Operation and Maintenance Manual VariCool EZ-Fit Blower Section United CoolAir does not approve any auxiliary devices or electric heaters to be installed in the ductwork and Before installing the blower section(s), make sure the controlled by the unit. appropriate gasket material has been applied to the top of... -
Page 24: Water Requirements
R-454B NOTE: United CoolAir DOES NOT APPROVE of the refrigerant. POE oil, if it ever comes in contact use of potable water with this product. with PVC or CPVC piping, may cause failure of the PVC/CPVC. -
Page 25: Electrical And Controls
Installation, Operation and Maintenance Manual VariCool EZ-Fit Water Piping Connection Sizes INFORMATION Tonnage Size It is advantageous to record the inlet and 2” water outlet fluid temperatures, and the 2.5” heat exchanger pressure drop during the 2.5” unit start-up procedure. These are then a valid reference point for cleaning and Dual Module 3”... -
Page 26: Calculating Mca And Mop
Installation, Operation and Maintenance Manual VariCool EZ-Fit 2. Water Source Heat Pump – Compressors and INFORMATION Electric Heaters operate concurrently: Load 1 = Largest motor or branch circuit current Confirm that the incoming power supply matches the unit data tag. Load 2 = Sum of all motor current without Load 1 Load 3 = Current of electric heaters Load 4 = Any other load rated 1.0 amp or more. -
Page 27: Power Wiring
Installation, Operation and Maintenance Manual VariCool EZ-Fit Power Wiring always be positive) Voltage Unbalance = 100 x (17/467) = 3.6%. A factory provided power block is installed internal to the unit’s electrical control panel. Route the main power wires In this example the percentage of voltage unbalance in accordance with all codes from the disconnect to the exceeds the desired maximum of 2%. -
Page 28: Wall Display
Installation, Operation and Maintenance Manual VariCool EZ-Fit Wall Display The Wall Display is a shipped loose item along with 100 INFORMATION feet of interconnecting cable. Refer to the Marvel If there are 2 equal duct takeoffs acting as Premium installation instructions for specific mounting 2 supply mains off the unit, the duct static instructions, details and precautions. -
Page 29: Outdoor Temperature / Humidity Sensor
Installation, Operation and Maintenance Manual VariCool EZ-Fit Figure 10 – Return Temperature Sensor Outdoor Temperature / Humidity Sensor (Airside Economizer option) Figure 12 – Smoke Detector The duct mounted outdoor air temperature and humidity sensor is a factory supplied, field installed, shipped loose Remote Start/Stop item for units with airside economizer option. -
Page 30: Sequence Of Operation Guides
Installation, Operation and Maintenance Manual VariCool EZ-Fit control panel. The water flow switch interlock relay must be a voltage free dry contact. 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 15) Figure 14 –... -
Page 31: Water System Quality
Installation, Operation and Maintenance Manual VariCool EZ-Fit Water System Quality Corrosion: Decomposition of the metal caused by • absorption of gases from the air.Corrosion may occur in The cleaning, flushing and chemical treatment of a water any metal component of the system. source heat pump system is fundamental to efficient operation and the life expectancy of the system. -
Page 32: R-454B Guidelines
Installation, Operation and Maintenance Manual VariCool EZ-Fit 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 33: Minimum Room Area
Installation, Operation and Maintenance Manual VariCool EZ-Fit 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 shall served indoor space must be larger or equal to the not be less than 20 mm above the surface of the floor Minimum Room Area as shown in Table 4. - Page 34 Installation, Operation and Maintenance Manual VariCool EZ-Fit (lbs) TAmin (ft (kg) TAmin (m (lbs) TAmin (ft (kg) TAmin (m 15.0 269.9 25.1 30.0 284.9 26.5 45.0 299.9 27.9 60.0 314.9 29.3 75.0 329.9 10.0 30.6 90.0 344.9 10.4 32.0 105.0 359.9 10.9 33.4...
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Page 35: Minimum Rated Airflow
Installation, Operation and Maintenance Manual VariCool EZ-Fit Minimum Rated Air Flow Tonnage Minimum CFM Tonnage Minimum CFM 1270 4580 1580 4580 1900 5200 2600 7070 2600 8000 3530 9150 4000 9150 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 36 Installation, Operation and Maintenance Manual VariCool EZ-Fit Figure 16 – Refrigerant charge (kg) vs. required conditioned space area (m Figure 17 – Refrigerant charge (lbs) vs. required conditioned space area (ft Subject to change without notice.
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Page 37: Minimum Installation Requirements
Installation, Operation and Maintenance Manual VariCool EZ-Fit 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 38: Repairs To Sealed Components
Installation, Operation and Maintenance Manual VariCool EZ-Fit 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: that capacitors are discharged: this shall be done in •... -
Page 39: Recovery
Installation, Operation and Maintenance Manual VariCool EZ-Fit 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. Label the system when charging is complete (if •... -
Page 40: Labeling
Installation, Operation and Maintenance Manual VariCool EZ-Fit 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... -
Page 41: Rds Sequence
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 42: Mitigation Strategy
Installation, Operation and Maintenance Manual VariCool EZ-Fit 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 43: Maintenance Procedures
Installation, Operation and Maintenance Manual VariCool EZ-Fit Maintenance Procedures more frequently depending on use and surrounding ELECTRICAL HAZARD conditions. Turn OFF power and lockout service before conducting any maintenance. Keep hands, Filters clothing and tools clear of electrical To keep the system operating as efficiently as possible, terminals. -
Page 44: Belt Tensioning
Installation, Operation and Maintenance Manual VariCool EZ-Fit CAUTION Over lubricating will cause the bearing to overheat and could cause the grease seal to blow out. Both excessive and inadequate grease may cause premature bearing failure. Provided there is some grease in the bearings for lubrication, under lubrication is better than over lubrication as grease can easily be added but not removed. -
Page 45: Drain Pan
Installation, Operation and Maintenance Manual VariCool EZ-Fit The finned coils in a unit should be checked at least every 2-3 months or more frequently based on experience of the specific application. Before cleaning finned coils remove the filters. Remove any large debris or visible dirt accumulation. Protect any controls or sensors that should not be exposed to water or coil cleaning solutions. -
Page 46: Waterside Economizer Coil
Installation, Operation and Maintenance Manual VariCool EZ-Fit Coaxial heat exchangers will need to be cleaned using a chemical solution. These are available commercially. INFORMATION Follow all manufacturer recommendations and safety After installation and during equipment warnings. startup, the sight glass may appear Pink or Purple. -
Page 47: Operation Verifications Checklist
Installation, Operation and Maintenance Manual VariCool EZ-Fit Operations Verifications Checklist This checklist is designed to be a list of verifications after 3. Water Balance verification – Ensure that the unit has the initial install has been completed. Assuming all 3 GPM per ton available to it at all times, if a pump is electrical and tie in operations are complete and without of variable speed it must be able to ramp up its speed issue. -
Page 48: Troubleshooting
Installation, Operation and Maintenance Manual VariCool EZ-Fit Troubleshooting Guide Turn OFF power to unit before conducting any troubleshooting, unless the tests you ELECTRICAL are performing require system operation. Keep hands, clothing and tools clear of HAZARD electrical terminals. Make sure to keep hands and clothing clear of any moving belts, blowers and motors WARNING while performing any tests. -
Page 49: Limited Warranty
VariCool EZ-Fit Limited Warranty The following is the Limited Warranty provided by United CoolAir (a trade name of United CoolAir LLC, herein “Seller”) to any customer (herein “Buyer”) for any goods and services (a “deliverable”): 1. Limited Warranty. Seller provides such warranty as set forth in any instruction manual provided with the deliverable, or if there is no such warranty or instruction manual, Seller warrants to Buyer that such deliverable will be free from defects in material and workmanship (in either case the "Limited Warranty"). - Page 50 Installation, Operation and Maintenance Manual VariCool EZ-Fit Limited Warranty Wear items or consumables such as belts, filters, coolant, refrigerant, etc. are not included under the Limited Warranty. The Limited Warranty does not cover the equipment and materials not manufactured by Seller; the warranty for those items shall be limited to only such warranty as that furnished by the manufacturer thereof as may properly be assigned to Buyer.
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Page 51: Pre-Start-Up Checklist
Installation, Operation and Maintenance Manual VariCool EZ-Fit Pre-Start-up Checklist Installing contractors should verify the following items prior to unit start-up. Is there any visible shipping damage? Is the unit level? Is proper vibration isolation provided in accordance with IOM? Are the unit clearances adequate for service and operation? Do all panel and/or access doors open freely and are the handles operational? Have all shipping braces been removed? If iDDP/DDP fans are installed, have shipping blocks been removed and spring isolators been adjusted? -
Page 52: Start-Up Procedures
Installation, Operation and Maintenance Manual VariCool EZ-Fit Start-Up Procedures (R-454B Systems) This start-up procedure is based on using factory 11. Record the voltage at the unit terminals. provided microprocessor-based HVAC controller. Please 12. Assuming previous review of the Marvel read the Marvel Premium Controls Installation Manual Premium literature of previous experience, located at: navigate to the sub-menu System ON/OFF... - Page 53 Installation, Operation and Maintenance Manual VariCool EZ-Fit heat exchanger outlet. WARNING RISK OF HEAT-EXCHANGER FREEZE: 28. Using an appropriate pressure / temperature chart Heat Exchanger will fail if operated at or for R-454B refrigerant, look up and record the near the freezing point of water/glycol saturation temperature corresponding to the liquid mixture.
- Page 54 Installation, Operation and Maintenance Manual VariCool EZ-Fit menu. To operate the unit in heating mode schedule (documented Marvel and based on the type of product Constant Premium Literature). Air Volume, Variable Air Volume, DOAS, etc.) increase the Return/Space Cooling Set 35.
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Page 55: Water Cooled Startup Form
Water Cooled Startup Form Start-up Procedures (R-454B) 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 56 Water Cooled Startup Form Start-up Procedures (R-454B) Start-up Form continued Cooling Fluid Type: (circle one) Water Water/Glycol Mixture What is the percentage of mixture: Water Glycol Good down to temperature of: °F Are there cooling fluid leaks? If yes, describe where or take a photo and describe what is being done to correct this issue: On the controller, force valves to 100% open in Technician >...
- Page 57 Water Cooled Startup Form Start-up Procedures (R-454B) Heating Mode (Optional Electric Heaters, Hot Water Coil, Steam Coil) Record the following: Return Temperature °F Supply Temperature °F Record water temperatures with hot water coil open. Water Temperature: Inlet °F Outlet °F Steam: Electric Heater size: Voltage:...
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Page 58: R-454B Pressure / Temperature Chart
Installation, Operation and Maintenance Manual VariCool EZ-Fit 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... - Page 59 Installation, Operation and Maintenance Manual VariCool EZ-Fit 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...
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Page 60: Nomenclature
Installation, Operation and Maintenance Manual VariCool EZ-Fit Product Nomenclature EXAMPLE: “VZ” = VariCool EZ-Fit “W”, WH”, “CW”, or “A“ “W” = Water-Cooled, Air Conditioner “WH” = Water Source Heat Pump “A” = Air Cooled with Remote Condenser “R”, “L”, “D”, or “S” Module Quantity/ Style “R”... -
Page 61: Product 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 62 Installation, Operation and Maintenance Manual VariCool EZ-Fit NOTES: Subject to change without notice.
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Page 63: Appendix
Installation, Operation and Maintenance Manual VariCool EZ-Fit Appendix Subject to change without notice. -
Page 64: Electrical Diagram (For Reference Only / Sample)
Installation, Operation and Maintenance Manual VariCool EZ-Fit SAMPLE - For reference only Subject to change without notice. - Page 65 Installation, Operation and Maintenance Manual VariCool EZ-Fit SAMPLE - For reference only Subject to change without notice.
- Page 66 Installation, Operation and Maintenance Manual VariCool EZ-Fit UCA_IOM_EZFIT Date: 02/25/25 Revision – A UCA PN: 9CAIOMEZFIT...
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