United CoolAir VariCool VAV Installation, Operation And Maintenance Manual
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Installation, Operation and Maintenance ManualVariCool® VAV3Subject to change without notice 1020-IM (0818)ContentsContents � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3Wiring Diagram � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4Important Notice � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5Use of Symbols� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5General Information � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6EQUIPMENT INSPECTION 6HANDLING 6LOCATION AND CLEARANCES 6UNIT DIMENSIONS 7UNIT WEIGHT � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9UNIT INSTALLATION � � � � � � � � � � � � � � � � � � � � � � � � � � � 10Vibration Absorbers 10Refrigerant Connections 10Duct Connections 12Water Piping / Water Flow 12Water Connections 12Recommended Field Installed Externally� � � � � � � � � � � 12Condensate Drain Connection 12ELECTRICAL CONNECTIONS 13SINGLE POINT DISCONNECT (OPTION) 13SERVICE DISCONNECT 13Supply Air Temperature Sensor 14Return Air Temperature Sensor (Option) 14Duct Mount Installation 14Wall Mount Installation 14Return Air Sensor Wiring 15Return Air RH Sensor (Option) 15Outdoor Air Sensor (Option) 15Duct Mount Installation 15Outdoor Air Sensor Wiring 15Return Air RH Sensor (Option) 15High Static Pressure Switch 15Remote Alarm Output (Option) 16Remote Water Pump (Option) 16O/A Damper Control (Option) 16Smoke Detector/Fire Stat (Option) 16Remote On/Off Control (Option) 16SEQUENCE OF OPERATION 16MARVEL PLUS CONTROLLER 16Maintenance Procedures � � � � � � � � � � � � � � � � � � � � � � � � 17Filters� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 17Cleaning The Water-Cooled Condenser� � � � � � � � � � � � 17Blowers � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 17Blower Motors� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 17Blower Speed Adjustment � � � � � � � � � � � � � � � � � � � � � � � 18Blower Bearing Lubrication� � � � � � � � � � � � � � � � � � � � � � 18Belts� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 18Refrigerant Systems� � � � � � � � � � � � � � � � � � � � � � � � � � � � 19Evaporator And Air-Cooled Condenser Coils � � � � � � � 19Finned Coil Cleaning 19Water Side Economizer Coil 20Water Valves 20Hard Start Kit 20Checking Hot Gas Bypass Valve 20Adjustment Of Hot Gas Bypass Valve 20Sequence Of Operation Cooling - - Air-Cooled 21Cooling - - Water-Cooled 21Cooling - - Chilled Water 21Heating (Other Than Heat Pump) 21Heating (Heat Pump, Water Source) 21Troubleshooting � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 22Limited Warranty � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 26Limited Warranty for Hermetic Compressors � � � � � � � 27Limited Warranty Condensing Section � � � � � � � � � � � � 28Limited Warranty for Hermetic Compressors � � � � � � � 29Air-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 30Start-Up Procedures (R-410a Systems) 30–31Air-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 32Water-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 34Start-Up Procedures (R-410a Systems) 34–35Water-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 36VARICOOL - Model Number Designation � � � � � � � � � � � 38 |
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