Accurex XDG Installation, Operation And Maintenance Manual
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Direct Gas Make-Up Air13InstallationOptional Electrical Accessory WiringEvaporative Cooling Module1. Auto Drain and Fill ValvesThe unit may have been provided with the auto drainand fill option. If this option has been provided, the unitwiring diagram will indicate field wiring (dashed lines)to the supply valve, drain valve, and supply drain valve.Wire the valves as indicated on the unit wiring diagram.Note: The valves can be provided by the factory or field-supplied by others. If field-supplied valves are utilized,the total inrush VA shall not exceed 160 VA and thetotal holding VA shall not exceed 66 VA with a 24 VACsupply.2. Freeze Protection SensorIf the unit was provided with the auto drain and filloption and the evaporative cooling module was shippedseparately, the freeze protection sensor must be field-wired. The freeze protection sensor will be factoryinstalled to the bottom side of the top louver on the unitintake. Wire the freeze sensor as indicated on the unitwiring diagram (dashed lines).3. Single Pass Water Control ValvesThe unit may have been provided with the single passcontrol valve option. If this option has been provided,the unit wiring diagram will indicate field wiring (dashedlines) to the supply valve and supply drain valve. Wirethe valves as indicated on the unit wiring diagram.NOTE: The valves can be provided by the factory orfield-supplied by others. If field-supplied valves areutilized, the total inrush VA shall not exceed 160 VAand the total holding VA shall not exceed 66 VA with a24 VAC supply.Cooling Relay(s)If the unit was provided with an optional chilled watercoil or split DX coil, the cooling relay can provide anenable signal for the cooling system. When a call forcooling has been signaled, the cooling relay closes a dryNO contact rated for 8 amps and 250 VAC.Carbon Dioxide (CO2) SensorDepending on the application, recirculating units mayhave been provided with a wall mounted CO2 sensor.The CO 2 sensor is intended to prevent the build-upof CO2 in the space. It must be wired as indicated onthe unit wiring diagram to command the unit to 100%outside air in the event CO2 rises above the alarmsetting. If a microprocessor is included with this unit,reference the supplemental Microprocessor Controllerfor Make-Up Air Reference Guide for more information.Fire Suppression SystemThe building fire suppression system is typically wiredto shut down the unit in the event of a fire. A normallyclosed (NC) contact should be wired in series withunit enable switch or contact. This is located betweenterminals R and G on the wiring diagram. When the firesuppression system alarms, it shall open this contactremoving 24 VAC power from terminal G which willdisable the unit.Fire Stat Type IIIThe optional fire stat type III is shipped separately forfield installation and wiring. The fire stat is typicallyinstalled in the return air duct to shut down the fanin the event of elevated temperature in the duct. Thenormally closed (NC) contact can be wired in series withthe fire suppression contact to shut down the unit. Thefire stat has additional contacts that can be used to alertan external system.Duct Smoke DetectorThe optional duct smoke detector is shipped separatelyfor field installation and wiring. The smoke detector istypically installed in the return air duct to shut downthe fan in the event of a fire. The normally closed(NC) contact should be wired in series with the firesuppression contact to shut down the unit. The smokedetector has additional contacts that can be used toalert an external system.Remote PanelThe optional remote panel is shipped separately forfield installation and wiring. 24 VAC control wiring mustbe connected between the remote panel and the unitcontrol center. This wiring is connected point-to-pointfrom the remote panel terminal strip to the unit terminalstrip. Refer to the remote panel wiring diagram fordetails.Note: Any sensor(s) or temperature adjustment dial(s) onthe remote panel must be run with shielded cable or inseparate conduit. |
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