Accurex XDG Installation, Operation And Maintenance Manual
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Direct Gas Make-Up Air121. Determine the Size of the Main Power LinesThe unit’s nameplate states the voltage and the unit’sMCA. The main power lines to the unit must be sizedaccordingly. The nameplate is located on the outside ofthe unit on the control panel side.2. Provide the Opening(s) for the ElectricalConnectionsElectrical openings vary by unit size and arrangementand are field-supplied.3. Connect the Main PowerConnect the main power lines to the disconnect switchand main grounding lug(s). Torque connections todisconnect according manufacturer specifications.4. Wire the Optional Convenience OutletThe convenience outlet requires a separate 115V powersupply circuit. The circuit must include short circuitprotection supplied by others.5. Wire Evaporative Cooling PumpsReference the unit wiring diagram attached to theinside of the unit control center door. Locate the “EvapPump(s)” on the wiring diagram. If they are connectedwith solid lines indicating factory wiring, no field wiringis required.If the evaporative pump(s) are shown with dashed linesindicating field wiring, wire the pumps to the terminalsindicated in the unit control center.Larger units may require a separate 115 VAC powersource. If this is necessary, it will be indicated on thewiring diagram. Wire a separate 115 VAC power supplyas indicated on the wiring diagram to power the pumps.InstallationLine Voltage Electrical WiringBefore connecting power to the unit, read andunderstand the following instructions and wiringdiagrams. Complete wiring diagrams are attached onthe inside of the control center door(s).All wiring must be done in accordance with the latestedition of the National Electrical Code NFPA 70 and anylocal codes that may apply. In Canada, wiring must bedone in accordance with the Canadian Electrical Code.The equipment must be properly grounded. Anywiring running through the unit in the airstream mustbe protected by metal conduit, metal clad cable orraceways.Manufacturer’s standard control voltage is 24 VAC.Control wire resistance must not exceed 0.75 ohms(approximately 285 feet total (86.9 m) length for14 gauge wire; 455 feet (138.7 m) total length for12 gauge wire). If the resistance exceeds 0.75 ohms,an industrial-style relay must be wired in place of theremote switch. The relay must be rated for at least5 amps and have a 24 VAC coil. Failure to comply withthese guidelines may cause motor starters to chatter ornot pull in, resulting in contactor failures and/or motorfailures.Evap Pump Factory Wiring ExampleRefer to wiring diagram for unit specific wiringEvap Pump Field Wiring ExampleRefer to wiring diagram for unit specific wiringSeparate Power Wiring ExampleRefer to wiring diagram for unit specific wiringCAUTIONIf replacement wire is required, it must have atemperature rating of at least 105ºC.Any wiring deviations may result in personal injury orproperty damage. Manufacturer is not responsiblefor any damage to, or failure of the unit caused byincorrect field wiring.DANGERHigh voltage electrical input is needed for thisequipment. This work should be performed by aqualified electrician.Electrical Nameplate |
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