Haier HDU-60CA03T3 Service Manual

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

Contents

Commercial Air Conditionerpressure switch act, low pressure switch has acteivated more than 30 seconds, LCD will displayLow pressure abnormal(3) In defrosting and in 6 minute after defrost is over , low pressure switch will not be checked.(4) In heating, compressor run and outdoor motor stop, low pressure switch will be shielded.(5) Low pressure protection can be resumable when power-off.4.6 3-minutes protection for compressorAfter compressor stops, it cannot be started until 3 minutes later. During the machine’s running,if the time not more than 3 minutes after power is off, the compressor cannot be restarted until 3minutes later after it is powered on again4.7 Sensor broken down protectiona. Check if sensor breaks downAfter compressor has run for 2 minutes, the unit will check the sensor, Outdoor board checksthe sensor in short circuit or in open circuit or near to short/open circuit for 2 minutes continuously,then it will adjust the sensor broken down.b. How to deal with it?If the outdoor ambient temperature sensor and the outdoor coil temperature sensor havebroken down, the unit will stop running, and alarm E3, E4, E4 simultaneously.4.8 Starting current controlOutdoor unit load control: after the outdoor motor running for 2 seconds, main compressor startup, the secondary compressor will run 2 seconds later.4.9 4-way valve control5. Outdoor PCB test(1) There are three pins marked with TEST, please make the two ones near to COOL in short circuit.Outdoor begin to run in cooling mode, that is, compressor run and outdoor motor works at highspeed.(2) There are three pins marked with TEST, please make the two ones near to HEAT in short circuit.Outdoor begin to run in heating mode, that is, compressor and 4-way valve run, outdoor motorworks at low speed.6. Failure code listFailure description Code on wiredcontrollerFlash times of indoorreceiver boardRoom temp. sensor abnormal 01 Power LED flashes 1 timeIndoor coil temp. sensor abnormal 02 Power LED flashes 2 timesOutdoor temp. sensor abnormal 4A Power LED flashes 3 timesOutdoor coil temp. sensor abnormal 49 Power LED flashes 4 timesOver-current malfunction 48 Power LED flashes 5 timesHigh / Low pressure abnormal 53 Power LED flashes 6 timesCommunication malfunction between indoor and wired controller 07 Power LED flashes 8 timesCommunication malfunction between indoor and outdoor abnormal 06 Power LED flashes 9 timesDrainage system malfunction 08 Power LED flashes 10 timesAlarm of exterior annunciator 0B Power LED flashes 11 timesCoil gas pipe temp. Sensor abnormal 03 Power LED flashes 12 timesTemperature protection malfunction 0D Power LED flashes 13 times34