Bard P1060A1 Installation Instructions Manual

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Bard P1060A1 Installation Instructions Manual Manual pdf 14 page image

Manual 2100-324Page 12START UP AND OPERATIONTHREE PHASE SCROLL COMPRESSORSTART UP INFORMATIONScroll compressors, like several other types ofcompressors, will only compress in one rotationaldirection. Direction of rotation is not an issue with singlephase compressors since they will always start and run inthe proper direction.However, three phase compressors will rotate in eitherdirection depending upon phasing of the power. Sincethere is a 50-50 chance of connecting power in such a wayas to cause rotation in the reverse direction, verification ofproper rotation must be made. Verification of properrotation direction is made by observing that suctionpressure drops and discharge pressure rises when thecompressor is energized. Reverse rotation also results inan elevated sound level over that with correct rotation, aswell as, substantially reduced current draw compared totabulated values.Verification of proper rotation must be made at the timethe equipment is put into service. If improper rotation iscorrected at this time there will be no negative impact onthe durability of the compressor. However, reverseoperation for over one hour may have a negative impact onthe bearing due to oil pump out.NOTE: If compressor is allowed to run in reverserotation for several minutes the compressor’sinternal protector will trip.All three phase ZR*3 compressors are wired identicallyinternally. As a result, once the correct phasing isdetermined for a specific system or installation, connectingproperly phased power leads to the same Fusite terminalsshould maintain proper rotation direction.The direction of rotation of the motor may be changed byreversing any two line connections to the unit.SEQUENCE OF OPERATIONCOOLING – Circuit R-Y makes at thermostat pulling incompressor contactor starting the compressor and outdoormotor. The G (indoor motor) circuit is automaticallycompleted on any call for cooling operation, or can beenergized by manual fan switch on subbase for constant aircirculation.HEATING – A circuit R-W1 is completed on eachheating cycle energizing electric heat if so equipped.START UP NOTESFor improved start up performance, wash the indoor coilwith dishwasher detergentCOMPRESSOR CONTROL MODULEThe compressor control is an anti-short cycle/lockout timerwith high and low pressure switch monitoring and alarmoutput.ADJUSTABLE DELAY-ON-MAKE AND BREAKTIMEROn a call for compressor operation the delay-on-makeperiod begins which will be 10% of the delay-on-breaksetting. When the delay-on-make is complete and the highpressure switch (and low pressure switch if employed) isclosed, the compressor contactor is energized. Uponshutdown the delay-on-break timer starts and preventsrestart until the delay-on-break and delay-on-make periodshave expired.HIGH PRESSURE SWITCH AND LOCKOUTSEQUENCE (Standard Feature)If the high pressure switch opens, the compressorcontactor will de-energize immediately. The lockout timerwill go into a soft lockout and stay in soft lockout until thehigh pressure switch closes and the delay-on-make timehas expired. If the high pressure switch opens again in thissame operating cycle the unit will go into manual lockoutcondition and the alarm circuit will energize. Recyclingthe wall thermostat resets the manual lockout.LOW PRESSURE SWITCH, BYPASS, ANDLOCKOUT SEQUENCENOTE: The low pressure switch is an optional controland the bypass and lockout sequence are part ofthe standard compressor control module.If the low pressure switch opens for more that 120seconds, the compressor contactor will de-energize and gointo a soft lockout. Regardless the state of the lowpressure switch, the contactor will reenergize after thedelay-on-make time delay has expired. If the low pressureswitch remains open or opens again for longer than 120seconds the unit will go into manual lockout condition andthe alarm circuit will energize. Recycling the wallthermostat resets the manual lockout.