Summary of Contents for United CoolAir VariCool EZ-Fit 12
- Page 1 VariCool ® EZ-Fit Series Installation, Operation and Maintenance Manual Effective January 2018 Variable Air Volume Water-Cooled and Chilled Water...
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Page 3: Table Of Contents
Installation, Operation and Maintenance Manual VariCool EZ-Fit Contents Important Notice ������������������������������������������������������������������4 Direct Drive Blowers ����������������������������������������������������������22 Use of Symbols �������������������������������������������������������������������4 Drain Pan���������������������������������������������������������������������������23 General Information �������������������������������������������������������������5 Evaporator Coil ������������������������������������������������������������������23 Inspection of Equipment ������������������������������������������������5 Coil Cleaning ���������������������������������������������������������������23 Handling ������������������������������������������������������������������������5 Condenser Cleaning ����������������������������������������������������������23 Location �������������������������������������������������������������������������5 Water Side Economizer Coil ����������������������������������������������23 Application Data ������������������������������������������������������������5 Water Valves����������������������������������������������������������������������23... -
Page 4: Important Notice
Installation, Operation and Maintenance Manual VariCool EZ-Fit Important Notice This manual is the property of the owner. Please be sure to leave it with the owner when you leave the job. Use of Symbols This publication includes warnings, cautions and information icons that point out safety related issues or conditions as well as other pertinent information relative to a safe installation, service or maintenance situation�... -
Page 5: General Information
Installation, Operation and Maintenance Manual VariCool EZ-Fit General Information NOTE: This manual covers the standard unit configurations. INFORMATION Since many units are built-to-order some of the information provided may not directly apply to this Unit should NOT be located in space specific unit. -
Page 6: Service Clearances
Installation, Operation and Maintenance Manual VariCool EZ-Fit Service Clearances Single DWDI Modules Dual Modules Single DDP Modules Notes: (a) Service clearances apply to all air path configurations. (b) Service clearances apply to all size units� (c) Service clearances apply to both DWDI and DDP blower models in dual module configuration. Subject to change without notice. -
Page 7: 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�... -
Page 8: Physical Data
Installation, Operation and Maintenance Manual VariCool EZ-Fit Physical Data Model Total 165.8 202.0 260.2 300.9 Capacity (a) (MBH) Sensible 117.1 143.5 187.7 213.0 4800 6000 8000 9000 36.0 45.0 60.0 72.0 15.1 14.4 14.8 14.1 Type (QTY) DWDI Blower Size (Dia.) 15 - 15 18 - 18 CFM Range... - Page 9 Installation, Operation and Maintenance Manual VariCool EZ-Fit Physical Data continued Model Total 382.2 451.6 Capacity (a) (MBH) Sensible 283.5 330.7 12000 14000 90.0 105.0 14.0 14.0 Type (QTY) DDP (2) Blower Size (Dia.) 16.5 18.2 CFM Range 4800-13000 5500 - 14900 Type Pleated Throwaway 20 x 20 / 20 x 24...
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Page 10: Mounting And Placement
Installation, Operation and Maintenance Manual VariCool EZ-Fit Mounting and Placement Suggested Assembly Sequence Please ensure that it is recognized that the ezfit requires support on the bottom middle of the unit� This means that 1. Set Evaporator section in place� corner loading is insufficient for the task of placing an ez fit unit. - Page 11 Installation, Operation and Maintenance Manual VariCool EZ-Fit Another equally recognized and recommended base support If height and other reasons prevent adequate space for of the ez fit is shown on figure 3C which is channel steel framing waffle pads alone may be used reference figure of an approved gauge to support the weight, simply placed 3E�...
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Page 12: Evaporator Section
Installation, Operation and Maintenance Manual VariCool EZ-Fit Evaporator Section Compressor / Condenser Section Start by locating the evaporator section first. Set each section Next, locate the compressor / condenser section(s)� Again, as needed, making sure that in dual module applications the make sure the labels align properly for either the single or evaporator sections are placed correctly as left hand and dual module applications�... - Page 13 Installation, Operation and Maintenance Manual VariCool EZ-Fit TIGHTENING SCREW MOUNTING SCREWS DETAIL "A" MOTOR ELECT DETAIL "A" IN OUT TYP 8 PLCS LEFT FRONT RETURN RIGHT REAR Figure 5A 20 - 70 Ton Single 12-35 TON SINGLE FIGURE 5A Subject to change without notice. 40.20-IM (0118)
- Page 14 Installation, Operation and Maintenance Manual VariCool EZ-Fit TIGHTENING SCREW MOUNTING SCREWS DETAIL "A" MOTOR ELECT ELECT DETAIL "A" IN OUT TYP 16 PLCS LEFT FRONT MOTOR Figure 5B 20 - 70 Ton Dual 24-70 TON DUAL Subject to change without notice. 40.20-IM (0118) FIGURE 5B...
- Page 15 Installation, Operation and Maintenance Manual VariCool EZ-Fit MOUNTING SCREWS DETAIL "A" TIGHTENING SCREW MOTOR ELECT ELECT IN OUT DETAIL "A" TYP 16 PLCS LEFT FRONT MOTOR MOTOR MOTOR MOTOR MOTOR RETURN RETURN RIGHT REAR Figure 5B 20 - 70 Ton Dual Blower 20-70 TON DUAL BLOWER FIGURE 5C Subject to change without notice.
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Page 16: Refrigerant Connections ����������������������������������������������������16 Limited Warranty Condensing Section
Installation, Operation and Maintenance Manual VariCool EZ-Fit Refrigerant Connections Size Wrench Full Turns Required 3/8" 1-3/16" All units are shipped from the factory with a full factory 1/2" 1-3/16" refrigerant charge. The resealable refrigerant fittings must be connected and properly tightened to facilitate refrigerant 5/8"... -
Page 17: Water Piping
Installation, Operation and Maintenance Manual VariCool EZ-Fit Typically these units are installed using the mechanical If this is not possible the unit should be verified to have room as the return air plenum� However, return ductwork had specialty coatings or heat exchanger coils installed if can be applied. - Page 18 Installation, Operation and Maintenance Manual VariCool EZ-Fit INFORMATION 2" 2" Field supplied water piping must include 2-1/2" a pet cock or other suitable means at the Dual Modules 2-1/2" highest point to bleed air from the water piping� 3" 3" INFORMATION Table 2 - Water Connection Sizes High inlet water temperature or low water...
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Page 19: Transformer
Installation, Operation and Maintenance Manual VariCool EZ-Fit High Static Pressure Switch INFORMATION High duct pressure static switches are an option that is The correct phase sequence of the installed on an ezfit unit. The high static pressure switch is a incoming power supply is a requirement�... -
Page 20: Static Pressure Transducer
Installation, Operation and Maintenance Manual VariCool EZ-Fit Voltage Unbalance INFORMATION Voltage unbalance occurs when the RMS line voltages on Shipped loose item that gets installed in a 3-phase power supply are unequal� Voltages are never the ductwork� Refer to the microprocessor balanced between phases, but if the level of the unbalance Installation instructions... -
Page 21: Maintenance Procedures���������������������������������������������������21 Start-Up Procedures (R-410A Systems)
Installation, Operation and Maintenance Manual VariCool EZ-Fit Maintenance Procedures The filters are directionally specific for air flow, reinsert the ELECTRICAL HAZARD new filter in the correct air flow direction. Turn OFF power and lockout service before conducting any maintenance� Keep Blowers hands, clothing and tools clear of electrical Check that the blower wheel is tight on the shaft and does... -
Page 22: Direct Drive Blowers
Installation, Operation and Maintenance Manual VariCool EZ-Fit Belt Tensioning Check the alignment of the sheaves to make sure that the sheave faces are in the same plane� Check this by placing Excessive belt tension is the number one cause for blower a straight edge across the face of the sheaves�... -
Page 23: Drain Pan
Installation, Operation and Maintenance Manual VariCool EZ-Fit Drain Pan CAUTION Every six (6) months, or as learned from the specific Confirm that any coil cleaning agents, application, check the condensate drain pan, trap and detergents or solutions are suitable for condensate line to ensure that the condensate is draining use on a copper tube/aluminum fin coil. -
Page 24: Refrigerant Systems
Installation, Operation and Maintenance Manual VariCool EZ-Fit Refrigerant Systems The sight glass contains a moisture indicator that changes color when moisture is present in the refrigerant system glass� Each refrigerant circuit contains a liquid line sight glass� If the color of this indicator is green or blue, the refrigerant is If bubbles appear in the sight glass, the system is either normal�... -
Page 25: 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�... -
Page 26: 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�... - Page 27 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 28 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�...
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Page 29: Limited Warranty
United CoolAir warrants this product to be free from defects Some states (provinces) do not allow the disclaimer of in factory workmanship and material under normal use and... -
Page 30: Limited Warranty For Hermetic Compressors
(such as concentrations of acids United CoolAir does not assume, or authorize any other or halogenated hydrocarbons)� person to assume for United CoolAir, any other liability for 6. Damages resulting from inadequacy or interruption of the sale of this product�... -
Page 31: Exclusions
Installation, Operation and Maintenance Manual VariCool EZ-Fit Limited Warranty Condensing Section United CoolAir warrants this product to be free from defects 12. This warranty does not apply to the installation, in factory workmanship and material under normal use and plumbing and wiring not integral to the product�... -
Page 32: Limited Warranty For Hermetic Compressors
United CoolAir does not assume, or authorize any other 7. Cleaning or replacement of filters or belts. person to assume for United CoolAir, any other liability for 8. Damages resulting from failure to properly and the sale of this product�... -
Page 33: Air-Cooled Unit
Installation, Operation and Maintenance Manual VariCool EZ-Fit Air-Cooled Unit Start-Up Procedures (R-410a Systems) Some of the numbered items below are referenced on the 12. Record the voltage at the unit terminals� Start Up Form that needs to be completed� 13. If possible with the thermostat provided, switch the This procedure has been created based on utilizing a evaporator blower to the RUN position�... -
Page 34: Optional Heating Start
Installation, Operation and Maintenance Manual VariCool EZ-Fit Start-Up Procedures (R-410a Systems) Continued: 21. Using an appropriate pressure / temperature chart for c. The blower motor FLA values should never be R-410a refrigerant, look up and record the saturation exceeded� temperature corresponding to the suction pressure� i. -
Page 35: Air-Cooled Unit
Installation, Operation and Maintenance Manual VariCool EZ-Fit Air-Cooled Unit Job Name: _________________________________ Date:____________ Start-Up Procedures Address: ____________________________________________________ Complete the form by listing your City: ___________________________ State: ________ZIP ____________ name, company name, phone and Country: ____________________________________________________ fax number� Sign and date the form and provide a copy as required to all Unit Model No.: ______________________________________________ interested parties�... -
Page 36: Cooling Mode
Installation, Operation and Maintenance Manual VariCool EZ-Fit Evaporator External Static Pressure ��������������������������(ESP): ____________ In� WG ________________ _________________________________________________________________________________________________ Condenser External Static Pressure ��������������������������(ESP): ____________ In� WG ________________ _________________________________________________________________________________________________ Cooling Mode _________________________________________________________________________________________________ System Air Temperatures �������������������������������������Return: °F _________ Supply: °F _________________ _________________________________________________________________________________________________ Condenser Coil �������������������������������������Outdoor Ambient: °F ___________ Condenser Discharge: °F ____________ Compressor 1 Compressor 2... -
Page 37: Water-Cooled Unit
Installation, Operation and Maintenance Manual VariCool EZ-Fit Water-Cooled Unit Start-Up Procedures (R-410a Systems) 1. Start up must be performed by a qualified HVAC 14. Verify that the evaporator blower is rotating in the Technician� correct direction (three phase units only)� 2. - Page 38 Installation, Operation and Maintenance Manual VariCool EZ-Fit Start-Up Procedures (R-410a Systems) Continued: 22. Record the entering and leaving fluid temperatures. a. Make sure the pressures on each compressor circuit are within the proper limits: b. Make sure the leaving fluid temperature is within the proper limits: i.
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Page 39: Water-Cooled Unit
Installation, Operation and Maintenance Manual VariCool EZ-Fit Water-Cooled Unit Job Name: _________________________________ Date:____________ Start-Up Procedures Address: ____________________________________________________ Complete the form by listing your City: ___________________________ State: ________ZIP ____________ name, company name, phone and Country: ____________________________________________________ fax number� Sign and date the form Unit Model No.: ______________________________________________ and provide a copy as required to all interested parties�... -
Page 40: Cooling Mode
Installation, Operation and Maintenance Manual VariCool EZ-Fit Verify that unit piping and heat exchangers will not be subject to freezing conditions� ������������������������������������������������������������������������������Yes ___________ No ___________ No cooling fluid leaks����������������������������������������������� Circuit 1 ___________ Circuit 2 _________________ Cooling Fluid Type If Glycol what percentage of mix:� ______________________ Good to a temperature of ______________________ Water / Fluid flow rate ���������������������������������������������������... - Page 41 Installation, Operation and Maintenance Manual VariCool EZ-Fit BASIC MODEL DESIGNATION EXAMPLE: “VZ” = VariCool EZ-Fit “W”, “CW” or A” “W” = Water-Cooled “CW” = Chilled Water Air Handler “A” = Air Cooled w/ Remote Air Cooled Condenser “R”, “L” or “D” Module Quantity/ Style “R”...
- Page 42 Installation, Operation and Maintenance Manual VariCool EZ-Fit NOTES: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Subject to change without notice.
- Page 43 Installation, Operation and Maintenance Manual VariCool EZ-Fit NOTES: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Subject to change without notice.
- Page 44 Engineered to Order 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 limited warranty�...
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