Haier HDU-60CA03T3 Service Manual

Also see for HDU-42CA03T3/H: Operation & installation manual Operation & installation manual

Contents

Commercial Air Conditionershort circuit continuously for 2 minutes, the mainboard will confirm that sensor is failure, the systemwill stop running, alarm occurs; If the signal is resumed, the system will resume automatically.8.2 For outdoor unit1. Outdoor motor controlWhen the system does not occur overcooling, overheating, and over current protections, theoutdoor motor will occur the below changes according to the outdoor ambient temperature andindoor coil temperature.1.1 General informationOutdoor motor is 2-speed type: high, low and stop.The fan speed will change unless every step has been run for 45 seconds.1.2 Cooling mode1.2.1 Indoor coil temp.≥15℃, outdoor motor runs at high speed.1.2.2 Indoor coil temp.＜5℃, outdoor motor runs at low speed.1.2.3 5℃≤Indoor coil temp.＜15℃, outdoor motor will change due to the outdoor ambient temp.Outdoor ambient temp. ＞28℃, enter high speed; outdoor ambient temp.＜26℃, enter high speed;26≤outdoor ambient temp.≤28℃, keep the current speed.In running, the system will be controlled as 2℃ temperature tolerance; if outdoor ambient temp. ＜26℃, enter low speed; if outdoor ambient temp.＞28℃, enter high speed.1.3 Heating mode (heat pump model)1.3.1 Indoor coil temp.≥50℃, outdoor motor will run at low speed.1.3.2 Indoor coil temp. ＜40℃, outdoor motor will run at high speed.1.3.3 40℃≤indoor coil temp.＜50℃, outdoor motor will change with outdoor ambient temp.Outdoor ambient temp.＜13℃, enter high speed; Outdoor ambient temp.＞15℃, enter low speed;13≤Outdoor ambient temp.≤15℃, keep the current speed;In running, the system will be controlled as 2℃ temperature tolerance; if outdoor ambient temp. ＜13℃, enter high speed; if outdoor ambient temp.＞15℃, enter low speed.Every step will run at least 45 seconds, and the motor will start up 2 seconds earlier thancompressor.2. Defrost control2.1 Defrosting conditionIn heating mode, the compressor will run for 30 minutes continuously or run for 45 minutes in alland for over 5 minutes contineously, outdoor motor at least runs for 2 minutes; If the outdoorambient temperature and outdoor coil temperature can comply with the shadow area in the figureand keep for 1 minute, the defrost will work and send defrost signal to indoor unit, then indoor unitwill control indoor motor accordingly.2.2 Quit conditionOutdoor coil temp. arrives the defrost-end temp. 14℃ or the defrost time is over 12 minutes, thedefrost will finish and send signal to indoor unit.2.3 Defrost operationCompressor and outdoor motor stop, indoor motor stops meanwhile; 55 seconds later, thereversing valve will close. Another 5 seconds later, compressor starts up.After defrost is over, compressor stops, outdoor motor runs at high speed; 55 seconds later, thereversing valve will open. Another 5 seconds later, compressor starts up and indoor motor runs atanti-code mode.31