Bard T24H1 Installation Instructions Manual

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Bard T24H1 Installation Instructions Manual Manual pdf 17 page image

Manual 2100-541DPage 17 of 28START UP (Continued)IMPORTANT INSTALLER NOTEFor improved start up performance wash the indoor coilwith a dish washing detergent.HIGH & LOW PRESSURE SWITCHAll T**H wall mounted air conditioner series modelsare supplied with a remote reset for the high and lowpressure switch. If tripped, this pressure switch may bereset by turning the thermostat off then back on again.THREE PHASE SCROLL COMPRESSORSTART UP INFORMATIONScroll compressors, like several other types ofcompressors, will only compress in one rotationaldirection. Direction of rotation is not an issue withsingle phase compressors since they will always startand run in the proper direction.However, three phase compressors will rotate ineither direction depending upon phasing of the power.Since there is a 50-50 chance of connecting powerin such a way as to cause rotation in the reversedirection, verification of proper rotation must be made.Verification of proper rotation direction is made byobserving that suction pressure drops and dischargepressure rises when the compressor is energized.Reverse rotation also results in an elevated sound levelover that with correct rotation, as well as substantiallyreduced current draw compared to tabulated values.Verification of proper rotation must be made at thetime the equipment is put into service. If improperrotation is corrected at this time, there will be nonegative impact on the durability of the compressor.However, reverse operation for over one hour may havea negative impact on the 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 ZP compressors are wired identicallyinternally. As a result, once the correct phasingis determined for a specific system or installation,connecting properly phased power leads to the sameFusite terminal should maintain proper rotationdirection.The direction of rotation of the compressor may bechanged by reversing any two line connections to theunit.PHASE MONITORAll units with three phase scroll compressors areequipped with a 3-phase line monitor to preventcompressor damage due to phase reversal.The phase monitor in this unit is equipped with twoLEDs. If the Y signal is present at the phase monitorand phases are correct the green LED will light.If phases are reversed, the red fault LED will be lit andcompressor operation is inhibited.If a fault condition occurs, reverse two of the supplyleads to the unit. Do not reverse any of the unitfactory wires as damage may occur.SERVICE HINTS1. Caution owner/operator to maintain clean airfilters at all times. Also, not to needlessly close offsupply and return air registers. This reduces airflowthrough the system, which shortens equipmentservice life as well as increasing operating costs.2. Check all power fuses or circuit breakers to be surethey are the correct rating.3. Periodic cleaning of the outdoor coil to permit fulland unrestricted airflow circulation is essential.