Related Manuals for United CoolAir VariCool VAV
Summary of Contents for United CoolAir VariCool VAV
- Page 1 VariCool ® Installation, Operation and Maintenance Manual Effective August 2018 Water-Cooled and Chilled Water, Variable Air Volume...
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Page 3: Table Of Contents
Installation, Operation and Maintenance Manual VariCool ® Contents Contents � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3 SEQUENCE OF OPERATION 16 MARVEL PLUS CONTROLLER 16 Wiring Diagram �... -
Page 4: Wiring Diagram
® Wiring Diagram United CoolAir provides a wiring schematic for each unit produced To retrieve the diagram for your unit please visit www�unitedcoolair�com, on your computer or mobile device, scroll to the footer section or Home/industry-resources, enter your serial number in the Serial Search field and press return to retrieve your product-wiring diagram. -
Page 5: Important Notice
Please be sure to leave it with the owner when you leave the job� NOTE: If the unit design was ordered specific to the will also list the specific United CoolAir Job Number application or installation, please refer to the Addendum or field reference Job Name. -
Page 6: General Information
Installation, Operation and Maintenance Manual VariCool ® General Information VariCool units are cooling and optional heating systems may be moved to the location of installation by crane, fork lift, designed to effectively and efficiently maintain tenant hand truck, or roller bars Units are provided with lifting rings occupied spaces within floor by floor building structures. -
Page 7: Unit Dimensions
Installation, Operation and Maintenance Manual VariCool ® FIGURE 1 – Service Clearances TABLE 1- SERVICE CLEARANCES Unit Model (A) Dim (B) Dim AV*8 – AV*16 30” 30” AV*20-AV*30 42” 36” AV*32-AV*60 50” 36” UNIT DIMENSIONS Figure 2 – Unit Dimensions and Table 2 show the dimensions of each unit section Note: If the System has the Water Side Economizer Coil option, the unit will have a fourth section that will be attached onto the Cooling Coil/Return Air Inlet... - Page 8 Installation, Operation and Maintenance Manual VariCool ® FIGURE 2 – Unit Dimensions TABLE 2 – Unit Dimensions MODEL AV*08 AV*10 21.5 AV*12 AV*16 AV*20 AV*24 AV*26 AV*30 AV*32 AV*36 AV*40 AV*44 10.5 AV*48 AV*52 AV*56 AV*60 Tx – Filter Rack dimensions are as follows: T1 –...
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Page 9: Unit Weight
Installation, Operation and Maintenance Manual VariCool ® UNIT WEIGHT Table 3 – Unit Weight shows the weights of each model The When calculating the weight for each unit, the weight of each weight of each unit is listed as a standard VariCool without optional component must be added to the standard VariCool options Table 4 –... -
Page 10: Unit Installation
Installation, Operation and Maintenance Manual VariCool ® UNIT INSTALLATION 4� Place each vibration isolator into positions shown in Figure 3, and then move the compressor and cooling Install the unit using the following procedures Consideration coil section into the location of installation being careful must be taken for proper condensate drain installation Slight not to damage the quick connect refrigerant piping elevation of the VariCool unit may be required for installation... - Page 11 Installation, Operation and Maintenance Manual VariCool ® Female Fitting INFORMATION NOTE: Once tight, refrigerant should be able to pass through the quick connect couplings If problems with low refrigerant pressure appear during system startup, double check the tightness of these quick connect couplings as loose fittings will restrain full refrigerant flow.
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Page 12: Duct Connections
Installation, Operation and Maintenance Manual VariCool ® Recommended Field Installed Duct Connections Externally A supply air plenum must be field fabricated and attached to the supply air outlet with a flexible duct collar. Follow appropriate guidelines for typical ducting installation Condensate Drain Connection Provide a duct length that is 3 to 4 times the diameter of Each VariCool unit has a condensate drain connection on... -
Page 13: Electrical Connections
Installation, Operation and Maintenance Manual VariCool ® INFORMATION NOTE: Conduit is not an acceptable ground source A separate ground conduct must be connected from Earth Ground to the factory supplied ground lug internal to the unit SENSOR FIELD MOUNTING & WIRING All sensors and optional components that must be field installed and wired to the electrical control panel must be wired as shown on the electrical diagram provided with the... -
Page 14: Supply Air Temperature Sensor
VariCool unit’s Filter Rack as possible Since label around the sensor wire stating “SUPPLY SENSOR United CoolAir may not know the application, please specify FACTORY INSTALLED” the type of sensor (wall or duct mount) required for field... -
Page 15: Return Air Sensor Wiring
Installation, Operation and Maintenance Manual VariCool ® Return Air Sensor Wiring 18� Use three #6 x ¾” Pan Head sheet metal screws and fasten bracket to the duct Using a minimum 18-20 AWG 300 volt rated two conductor 19� Place the probe into the supply air duct shielded cable with drain wire make the following electrical connections 20�... -
Page 16: Remote Alarm Output (Option)
Installation, Operation and Maintenance Manual VariCool ® 1� Drill a hole large enough to insert the pneumatic tubing VariCool’s Control Panel Terminate from the device contact into the ducting at a 90 degree right angle termination points to the factory provided terminals TB2-18 and TB2-19 2�... -
Page 17: Maintenance Procedures
Installation, Operation and Maintenance Manual VariCool ® Maintenance Procedures high condensing temperature and higher fluid pressure drop. ELECTRICAL HAZARD All of these affect the operating performance and efficiency of the system and need to be addressed Turn OFF power and lockout service before conducting any maintenance Keep Cleaning a water-cooled condenser helps to improve the hands, clothing and tools clear of electrical... -
Page 18: Blower Speed Adjustment
Installation, Operation and Maintenance Manual VariCool ® Blower Speed Adjustment Duty Grease Interval Low Usage 12 Months Blower speed may be changed by adjusting the variable diameter sheave provided on the blower drive motor Periodic 6 Months Sheave may be adjusted by removing the belt and loosening Continuous 1 –... -
Page 19: Refrigerant Systems
Installation, Operation and Maintenance Manual VariCool ® Refer to Figure 10 – Belt Tensioning below If the color of this indicator is blue, the refrigerant is okay When the indicator is pink or purple, an abnormal condition exists, servicing is required Deflection Point INFORMATION After installation and during equipment... -
Page 20: Water Side Economizer Coil
Installation, Operation and Maintenance Manual VariCool ® CAUTION INFORMATION Verify that this timer is set for 3 or more Confirm that any coil cleaning agents, detergents or solutions are suitable for minutes use on a copper tube/aluminum fin coil. If the cleaning agent is to acidic or alkaline, Checking Hot Gas Bypass Valve damage to the coil fins may result. -
Page 21: Sequence Of Operation Cooling - - Air-Cooled
Installation, Operation and Maintenance Manual VariCool ® Adjustments should be made in small increments, a� Lower thermostat set point to lowest level allowing the system to stabilize after each turn� b� Set System switch to “OFF” position 5� Vary the evaporator load to test at various conditions c�... -
Page 22: Troubleshooting
Installation, Operation and Maintenance Manual VariCool ® Troubleshooting WARNING Turn OFF power to unit before conducting any troubleshooting, unless the tests you are performing require system operation Keep hands, clothing and tools clear of electrical terminals and rotating components ITEM CODE PROBLEM PROBABLE CAUSE SOLUTION... - Page 23 Installation, Operation and Maintenance Manual VariCool ® ITEM CODE PROBLEM PROBABLE CAUSE SOLUTION Lack of proper air quantity Check filters: Clean or replace if necessary. Check for obstruction across coil. Check rotation of evapo- rator blower to ensure correct rotation of evaporator blowers.
- Page 24 Installation, Operation and Maintenance Manual VariCool ® ITEM CODE PROBLEM PROBABLE CAUSE SOLUTION Air or other non-condensable gas in system Evacuate system and recharge. Install new filter-drier. Clean away debris. Condenser air intake blocked Reclaim excess from high pressure side of the Overcharge of refrigerant system.
- Page 25 Installation, Operation and Maintenance Manual VariCool ® ITEM CODE PROBLEM PROBABLE CAUSE SOLUTION Check for control wiring to the free cool Check wiring diagram and rewire. solenoid valve. System short of capacity in Low water flow rate Check source of water flow. free cool (water coil) mode Check to see that power to the pump is Locate and repair electrical connection problem.
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Page 26: 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 27: 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 electrical service, improper voltage conditions, blown This warranty gives you specific legal rights. -
Page 28: Limited Warranty Condensing Section
VariCool ® Limited Warranty Condensing Section United CoolAir warrants this product to be free from defects plumbing and wiring not integral to the product in factory workmanship and material under normal use and 13� Damages resulting from improper application or sizing... -
Page 29: 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 regularly clean air and/or water side of condenser and This warranty gives you specific legal rights. -
Page 30: Air-Cooled Unit
Installation, Operation and Maintenance Manual VariCool ® 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 Verify that the standard wall thermostat If another controller is being... -
Page 31: Start-Up Procedures (R-410A Systems)
Installation, Operation and Maintenance Manual VariCool ® 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 32: Air-Cooled Unit
Installation, Operation and Maintenance Manual VariCool ® 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 33 Installation, Operation and Maintenance Manual VariCool ® 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...
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Page 34: Water-Cooled Unit
Installation, Operation and Maintenance Manual VariCool ® 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 35: Start-Up Procedures (R-410A Systems)
Installation, Operation and Maintenance Manual VariCool ® 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�... -
Page 36: Water-Cooled Unit
Installation, Operation and Maintenance Manual VariCool ® 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 37 Installation, Operation and Maintenance Manual VariCool ® 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 GPM __________________ Entering Water Temperature (EFT): °F ___________ Leaving Water Temperature (LFT): °F _________ Water / Fluid Pressure Drop across unit: PSI _________...
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Page 38: Varicool - Model Number Designation
Installation, Operation and Maintenance Manual VariCool ® VARICOOL - Model Number Designation EXAMPLE: “AV” Adjustable Air Volume (Variable air volume) “W” or “A” “W” Water-cooled Self Contained “A” Remote Air Cooled Condenser being used “XX” Nominal Cooling Capacity in Tons: “08”, “10”, “12”, “16”, “20”, “24”, “26”, “30”, “32”, “36”, “40”, “44”, “48”, “52”, “56”, “60”... - Page 39 Installation, Operation and Maintenance Manual VariCool ® NOTES: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Subject to change without notice.
- Page 40 Installation, Operation and Maintenance Manual VariCool ® NOTES: ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ Subject to change without notice.
- Page 41 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...
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