Bard K36A2-A Installation Instructions Manual

Contents

Manual 2100628Page 17 of 24IMPORTANT INSTALLER NOTEFor improved start up performance wash the indoor coilwith a dish washing detergent.HIGH PRESSURE SWITCHAll K**A/K**L wall mounted air conditioner seriesmodels are supplied with a remote reset for the highand low pressure switch. If tripped, this pressureswitch may be reset by turning the thermostat off thenback 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 in eitherdirection 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 an extended period of time, thecompressor’s internal protector will trip.All three phase 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 unit factorywires as damage may occur.CONDENSER FAN OPERATIONNOTE: All models covered by this manual areequipped with a low ambient control (LAC);on start up, the condenser fan motor will havedelayed start until system refrigerant operatingpressure builds up. After starting, the fanmotor may or may not cycle depending uponambient conditions. This is normal operation.SERVICE HINTS1. Caution owner/operator to maintain clean airfilters at all times. Also, not to needlessly closeoff supply and return air registers. This reducesairflow through the system, which shortensequipment service life as well as increasingoperating 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.