708619-0 S3BN AC Commercial II.indd - Nordyne

Use a separate branch electrical circuit for thisunit. A means of electrical disconnect must belocated within sight of and readily accessibleto the unit.Overcurrent protection must be provided at thebranch circuit distribution panel and sized asshown on the unit rating label and accordingto the National Electric Code and applicablelocal codes.Provide power supply for the unit in accordancewith the unit wiring diagram, and the unit ratingplate. Connect the line-voltage leads to theterminals on the contactor inside the controlcompartment. Use only copper wire for the linevoltage power supply to this unit. Use proper codeagency listed conduit and a conduit connector forconnecting the supply wires to the unit. Propergrounding is accomplished by using the groundinglug provided in the control box.Disconnect Switch — An electrically compatibledisconnect switch must be within line of sight ofthe outdoor unit. This switch shall be capable ofelectrically de-energizing the outdoor unit.Optional Equipment — Optional equipment requiringconnection to the power or control circuitsmust be wired in strict accordance with currentprovisions of the “National Electrical Code” (ANSIC1.), with applicable local codes having jurisdiction,and the installation instructions provided withthe equipment. Optional Equipment (e.g.: liquidline solenoid valves, twinning kit, low ambient,etc.) should be installed in strict accordance withthe manufacturer’s installation instructions.8. STARTUP AND CHECKOUTAir Filters — Ensure air filters are clean and inplace prior to operating the equipment.WARNING:Ensure electrical power to the unitis off prior to performing the followingsteps. Failure to do so maycause personal injury or death.Thermostat — Set the room thermostat functionswitch to OFF, fan switch to AUTO, and movetemperature setpoint to its highest setting.Prior to applying electrical power to the outdoorunit, ensure that the unit has been properlyand securely grounded, and that power supplyconnections have been made at both the facilitypower interface and outdoor unit.Outdoor Unit — Ensure the outdoor coil andtop of the unit are free from obstructions anddebris, and all equipment access/control panelsare in place.Using extreme caution, apply power to the unitand inspect the wiring for evidence of open,shorted, and/or improperly wired circuits.Functional Checkout:Indoor Blower — Set the thermostat fan switchto ON. Verify that the indoor blower is operatingand that airfl ow is not restricted. Set the fanswitch back to AUTO.CAUTION:If equipped with a compressorcrankcase heater, wait 24 hoursprior to performing a functioncheckout to allow for heating of thecompressor crankcase. Failure tocomply may result in damage andcould cause premature failure ofthe system.Cooling — Set the thermostat system switch to“Cool” and the thermostat fan switch to “Auto.”Lower the thermostat temperature switch belowroom temperature and ensure unit refrigerantpressures are in order.NOTE: If refrigerant pressures are abnormal,compressor may be rotating in the opposite direction.Shut off main power to the unit and switchany two fi eld wires at the disconnect. DO NOTalter unit wiring. Listen for any unusual noises.Locate the source and correct as needed.6