Uniflair WMA 0121 Operation And Maintenance Manual
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OPERATION AND MAINTENANCE MANUALWall Mounted 0121…066130 (32) Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 ENFREE COOLING SYSTEMPROBLEM POSSIBLE CAUSE CHECK/REMEDYFREE-COOLING CYCLE DOES NOTSTARTA) The servomotor damper doesn’t work. Check the electrical of the and if it is necessary toreplace or repare the motor.B) Control system setting is not correct. Check the setting of the control system.C) The control system doesn’t work. Check the functioning of the sensors.Cfr. mP20/W instruction manual.D) the main board does not receive consentof free-cooling (only units with externalcontrol system CDC).Check that the connection of external consent iscorrect (cfr. par.ELECTRICAL CONNECTIONS)ROOM TEMPERATURE IS TOO HIGH(the high room temperature threshold alarmis switched on)The free-cooling damper is open on theoutside; hot and/or humid outside air flowsthrough the evaporator.1) The damper motor doesn’t work; manually setthe damper in the recirculating position to awaitreplacement or repair. 2) the minimum setopening of the damper is excessive; recalibratethe minimum openingritarare (Cfr. mP20/Winstruction manual);3) the main board receives a wrong command ofdamper opening (only units with externalcontrol systems CDC).ROOM TEMPERATURE IS TOO LOW(the low room temperature threshold alarm isswitched on.)A) The free-cooling damper is open on theoutside; cold outside air flows through theevaporator.see ROOM TEMPERATURE IS TOO HIGHB) The modulation of the damper does notwork correctly with outside air that is toocold.1) The setting of the control system is not correct:check the setting of the control system.2) the base board receives a wrong command ofdamper opening (only units with externalcontrol systems CDC).ROOM HUMIDITY IS TOO HIGH(high room humidity threshold alarm isswitched on)The free-cooling damper is open on theoutside; hot and/or humid outside air flowsthrough the evaporator.See “ROOM TEMPERATURE IS TOO HIGH”HIGH COMPRESSOR CHARGEPRESSUREThe free-cooling damper is open on theoutside; hot and/or humid outside air flowsthrough the evaporator.See "ROOM TEMPERATURE IS TOO HIGH"LOW COMPRESSOR CHARGEPRESSURE(formation of frost in the coil)The free-cooling damper is open on theoutside; hot and/or humid outside air flowsthrough the evaporator.see "ROOM TEMPERATURE IS TOO HIGH" |
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