Uniflair WMA 0121 Operation And Maintenance Manual
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OPERATION AND MAINTENANCE MANUALWall Mounted 0121…0661Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN 29 (32)COMPRESSORPROBLEM POSSIBLE CAUSE CHECK/REMEDYTHE COMPRESSOR DOES NOT WORK A) Protection device against short circuit isswitched on.Restore the magnetic switch lever; check cause ofthe short circuit. Before restarting the compressorcheck the. heating element and the windingcontinuity of the motor.B)The internal protection of the compressoris switched on.see ‘COMPRESSOR INTERNAL PROTECTIONDEVICE SWITCHES ON’C) The contactor doesn’t work. Check the contacts and the main switch coil.COMPRESSOR INTERNAL PROTECTIONDEVICE SWITCHES ONA) Lack of phase (unit power supply400V/3N/50Hz)Check the compressor winding heating elements,after re-setting, measure the voltage and theabsorption of the three phases.B) Motor overload. Check that the unit is functioning within the pre-setlimits.C) Power supply voltage is too high or toolow.Check the unbalance between the phases of thethree phase power supply are within 2%.. Formonophase components the voltage must bebetween -10% and +6% the nominal value.D)Blocked rotor. Replace the compressor.THE COMPRESSOR IS NOISY A) The compressor is damaged. Call the nearest Help Center to replace thecompressor.B) Liquid return to the compressor. Check the functioning and overheating of theexpansion valve.ELECTRIC HEATERSPROBLEM POSSIBLE CAUSE CHECK/REMEDYELECTRIC HEATERS DO NOT The safety thermostat of the heatingelements is switched on.Airflow is insufficient see “LOW AIRFLOW”.Check the continuity of the safety thermostatconnection to the control system.The contactor doesn’t work. Check the contactor contacts and the electric coil.Protection device against short circuit isswitched on.Check the cause of the short circuit and re-set theautomatic switch lever IM. |
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