Related Manuals for United CoolAir VariCool EZ-Fit Series
Summary of Contents for United CoolAir VariCool EZ-Fit Series
- Page 1 VariCool ® EZ-Fit Series Installation, Operation and Maintenance Manual Effective March 2023 Variable Air Volume Water-Cooled, Water Source Heat Pump...
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Page 3: Table Of Contents
Installation, Operation and Maintenance Manual VariCool EZ-Fit Contents Contents � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3 Low Voltage Control Devices 22 Wall Display 22 Wiring Diagram �... -
Page 4: Wiring Diagram
Installation, Operation and Maintenance Manual VariCool EZ-Fit Wiring Diagram To retrieve the unit wiring diagram, scan the wiring diagram QR Code label affixed near the unit data tag This will link to wwwunitedcoolaircom website Scroll down to the Serial Search box and enter the unit serial number The serial number is a combination of the year, month and sequential order of build date This will return the Model Number, Job Number and the Wiring Diagram for viewing as well as downloading Wiring diagrams are available for units shipped since November 2016 For older units, please contact the factory at... -
Page 5: Safety Introduction And Labeling Guide
To obtain additional copies of the Installation, Operation and in death or serious bodily injury if not Maintenance Manual, please contact United CoolAir For avoided detailed information regarding specifications, dimensional drawings, and weight information, contact your local United CAUTION CoolAir manufacturer’s representative... -
Page 6: General Information
/ exterior damage standards F� Maintenance access United CoolAir has factory run tested this unit and has taken G� Mounting location is level in both horizontal planes photographs post testing for verification and reference in case of any damage incurred during transportation, handling H�... -
Page 7: Service Clearances
Installation, Operation and Maintenance Manual VariCool EZ-Fit Service Clearances FRONT FRONT Single Module FRONT FRONT Single Module Dual Module Dual Module Notes: (a) Service clearances apply to all air path configurations Notes: (b) Service clearances apply to all size units (a) Service clearances apply to all air path configurations (b) Service clearances apply to all size units Subject to change without notice. -
Page 8: 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 1) 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 Figure 1) Plugged A condensate drain trap must be field fabricated and installed... -
Page 9: Physical Data
Installation, Operation and Maintenance Manual VariCool EZ-Fit Physical Data Single Module Blower Type Filter Size Evap. Coil Compressor R-410A Nominal Tons iDDP DWDI Size (in) Rows Lbs/Ckt • • • 4 / 2 15x20 / 20x20 • • • 18x25 10.8 •... -
Page 10: Dimensions & Weight
Installation, Operation and Maintenance Manual VariCool EZ-Fit Dimensions and Weights Assembled Unit Single Module Dual Module Unit Weight Unit Weight Nominal Nominal Tons Tons iDDP DWDI iDDP DWDI 55-1/2 49-5/8 88-1/8 1635 1675 1650 110-1/2 49-5/8 88-1/8 3270 3350 3300 20-25 65-1/2 52-1/8... - Page 11 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 23-1/4 1000...
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Page 12: Mounting And Placement
Installation, Operation and Maintenance Manual VariCool EZ-Fit Mounting and Placement Mounting Options pad be of identical height and that the pads are kept no smaller than 4”x 4” You will need at minimum 30 pads to When installing any floor mounted unit, some form of support the EZ-Fit properly Additional pads, more than vibration isolation is required the specified count, will improve the support of the unit... - Page 13 Installation, Operation and Maintenance Manual VariCool EZ-Fit Figure 3E - Base Option 3 - Waffle Pads Only - Bottom View Figure 3C - Base Option 2 - Channel Steel with Waffle Pads - Bottom View Figure 3F - Base Option - Unit View - Single Module Figure 3D - Base Option 2 - Unit View - Single Module Subject to change without notice.
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Page 14: Suggested Assembly Sequence
Installation, Operation and Maintenance Manual VariCool EZ-Fit Suggested Assembly Sequence 1� Set Evaporator section in place 2� Set Compressor / Condensing section in place a� On Dual Module systems connect the factory provided water pipes between modules 3� Connect resealable refrigerant fittings 4�... -
Page 15: Resealable Refrigerant Fittings
Installation, Operation and Maintenance Manual VariCool EZ-Fit Resealable Refrigerant Fittings An insulation piece is factory installed between the module sections to seal any possible air leakage where the water All units are shipped from the factory with a full factory piping passes through the cabinets Cut a hole in the refrigerant charge The resealable refrigerant fittings must... -
Page 16: 3D-Intelliclamps
Installation, Operation and Maintenance Manual VariCool EZ-Fit Size Wrench 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 Turns INFORMATION If low refrigerant pressure is evident during the start-up process, check the tightness of all resealable fittings A fitting that is not fully open will restrict refrigerant flow... - Page 17 Installation, Operation and Maintenance Manual VariCool EZ-Fit TYPICAL 8 PLACES Figure 5A - Single Module Subject to change without notice.
- Page 18 Installation, Operation and Maintenance Manual VariCool EZ-Fit TYPICAL 16 PLACES Figure 5B - Dual Module Subject to change without notice.
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Page 19: Blower Section
Installation, Operation and Maintenance Manual VariCool EZ-Fit Blower Section INFORMATION Before installing the blower section(s), make sure the If the duct work is built in a manner that will appropriate gasket material has been applied to the top of the split into 2 separate supply ducts directly evaporator section and the compressor / condensing section off of the plenum, contact the factory... -
Page 20: Water Piping
Installation, Operation and Maintenance Manual VariCool EZ-Fit Water Piping some consideration for the chemical cleaning should be made if desired for future maintenance WARNING In some units, the optional shell & tube condensers may be incorporated Care must be taken when designing the water HEAT EXCHANGER FREEZE RISK: piping and other items external to the unit to allow room for Heat Exchanger will fail if operated at or... -
Page 21: Electrical And Controls
Installation, Operation and Maintenance Manual VariCool EZ-Fit INFORMATION INFORMATION High inlet water temperature or low water Use Copper Conductors Only Failure flow rate may result in nuisance tripping of to use copper conductors may result in the refrigerant high pressure switch equipment damage INFORMATION INFORMATION... -
Page 22: Transformer
Installation, Operation and Maintenance Manual VariCool EZ-Fit If no cause can be located and resolved for the unit power ELECTRICAL HAZARD supply, the building manager or owner should be notified of Conduit is not an acceptable grounding the issue to get the proper power supplied to the unit source A separate ground conductor must INFORMATION be connected from Earth Ground to the... -
Page 23: Bms Applications
Return Air Temperature Sensor issue to be resolved by the field United CoolAir, as an OEM, uses the current software and is not responsible for any The duct mounted return air temperature sensor is a factory... -
Page 24: Water Flow Switch Installation
Installation, Operation and Maintenance Manual VariCool EZ-Fit Water Flow Switch Installation EZ-Fit units utilize Head Pressure Control valves which modulate the water flow to maintain adequate refrigerant head pressure If a water flow switch is provided by the field, do not install the switch in the BRANCH pipe feeding condenser water to the unit A reduction of water flow from the unit head pressure control valve operation may cause nuisance trips Water flow switch trips will cause “loss of water... -
Page 25: Maintenance Procedures
Installation, Operation and Maintenance Manual VariCool EZ-Fit Maintenance Procedures DWDI Blowers ELECTRICAL HAZARD Check that the blower wheel is tight on the shaft and does Turn OFF power and lockout service not contact the blower housing (DWDI type) before conducting any maintenance Keep Check for restrictions or foreign material in the air circuit hands, clothing and tools clear of electrical terminals... -
Page 26: Belt Tensioning
Installation, Operation and Maintenance Manual VariCool EZ-Fit Belt Tensioning Belt tension is adjusted by using the adjusting bolt on the end of the motor mounting frame Excessive belt tension is the number one cause for blower Check the alignment of the sheaves to make sure that the bearing failure Proper belt tension and pulley alignment are sheave faces are in the same plane Check this by placing essential for trouble free operation... -
Page 27: Drain Pan
Installation, Operation and Maintenance Manual VariCool EZ-Fit CAUTION IDDP Wheel size Max Wheel RPM Max VFD Hz Operation Clean coils only with cold water and a 5195 suitable detergent or a commercially 4425 available coil cleaner DO NOT use hot 4038 water or steam to clean a coil containing refrigerant as this may cause a high... -
Page 28: Water Side Economizer Coil
Installation, Operation and Maintenance Manual VariCool EZ-Fit Water Side Economizer Coil If a unit contains the optional water side economizer coil it may also require a periodic cleaning These coils will need to be cleaned using a chemical solution These are available commercially Follow all manufacturer recommendations and safety warnings Water Valves... -
Page 29: Operations Verification Check List
Installation, Operation and Maintenance Manual VariCool EZ-Fit Operations Verification Check List This checklist is designed to be a list of verifications after the of variable speed it must be able to ramp up its speed initial install has been completed Assuming all electrical and based on that demand Variable Speed compressors tie in operations are complete and without issue require a minimum of 12 hours of continuous crank... -
Page 30: Troubleshooting Guide
Installation, Operation and Maintenance Manual VariCool EZ-Fit Troubleshooting Guide ELECTRICAL Turn OFF power to unit before conducting any troubleshooting, unless the tests you are performing require system operation Keep hands, clothing and tools HAZARD clear of electrical terminals Make sure to keep hands and clothing clear of any moving belts, blowers and WARNING motors while performing any tests Failure to do so could result in death or serious bodily injury... - Page 31 Installation, Operation and Maintenance Manual VariCool EZ-Fit PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION Evaporator 1� Lack of air flow 1� Check filters and coil for any blockages coil ices 2� Low return air temperature 2� Replace filters if dirty 3� Loss of refrigerant charge 3�...
- Page 32 Installation, Operation and Maintenance Manual VariCool EZ-Fit PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION Suction 1� Flash gas in liquid line 1� Check for refrigerant leak pressure 2� Obstructed expansion valve 2� Repair leak, evacuate and recharge refrigerant too low 3� Loss of fluid in expansion valve bulb system 4�...
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Page 33: 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") Except as expressly set forth in this section or specifically... - Page 34 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 belimited to only such warranty as that furnished by the manufacturer thereof as may properly be assigned to Buyer No warranty coverage is applicable if Buyer cannot prove original purchase date and required annual maintenance history, provide factory start up report, air and/or water balance, the data plate and/or serial number on any deliverable is removed,...
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Page 35: Water-Cooled Unit
Installation, Operation and Maintenance Manual VariCool EZ-Fit Water-Cooled Unit Pre Startup Checklist Installing contractor should verify the following items� 1� Is there any visible shipping damage? 2� Is the unit level? 3� Is proper vibration isolation provided in accordance with IOM? 4�... -
Page 36: Start-Up Procedures
Installation, Operation and Maintenance Manual VariCool EZ-Fit Start-Up Procedures (R-410a Systems) NOTE: Before conducting the following start up sections 1� Start up must be performed by a qualified HVAC connect a refrigerant gauge set to the unit Schrader Technician connections� Install temperature sensors or probes to 2�... - Page 37 Installation, Operation and Maintenance Manual VariCool EZ-Fit Start-Up Procedures (R-410a Systems) Continued: 1� If possible, record the fluid flow rate (GPM) b� Compressor Amperage is below the RLA Amps listed on the unit data tag a� Make sure the flow rate is within the proper limits: i�...
- Page 38 Installation, Operation and Maintenance Manual VariCool EZ-Fit Water-Cooled Unit Job Name: _________________________________ Date:____________ Start-Up Procedures Address: ____________________________________________________ City: ___________________________ State: ________ZIP ____________ Please complete the form and include contact, start-up date and all requested Unit Model No�: ______________________________________________ information Unit Serial No�: _______________________________________________ Screw Lugs &...
- Page 39 Installation, Operation and Maintenance Manual VariCool EZ-Fit Are there cooling fluid leaks? Circuit 1: Yes ________ No________ Circuit 2: Yes ________ No________ Cooling Fluid Type If Glycol what percentage of mix: ______________________ Good to a temperature of ______________________ Water / Fluid flow rate GPM __________________ Entering Water Temperature (EFT): °F ___________ Leaving Water Temperature (LFT): °F _________ Water / Fluid Pressure Drop across unit: PSI _________ Verify that all valves on each circuit are functioning properly Yes ___________ No ___________...
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Page 40: Product Nomenclature
Installation, Operation and Maintenance Manual VariCool EZ-Fit Product Nomenclature EXAMPLE: “VZ” = VariCool EZ-Fit “W”, or WH” “W” = Water-Cooled, Air Conditioner “WH” = Water Source Heat Pump “R”, “L” or “D” Module Quantity/ Style “R” = Right Hand Single Module “L”... -
Page 41: 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... - Page 42 Installation, Operation and Maintenance Manual VariCool EZ-Fit NOTES: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Subject to change without notice.
- Page 43 LIMITED WARRANTY Authorized Distributor: United CoolAir Units are backed by a 1 year limited warranty on parts and a 5 year limited warranty on the compressor (labor not included) Maintenance items such as filters and belts are excluded under this...