Haier AS18ND1HRA-WHITE Service Manual

Contents

Functions and controlDomestic air conditionerWhen ice_temp_3〈Tpg_indoor〈ice_temp_3+37.4°F , the frequency of the compressor increases at thespeed of 1HZ/10seconds.For example, Tpg_indoor≤32°F last for 2 minutes, and then the outdoor unit will stop, and reportunderload malfunction, but don’t send malfunction report to the indoor.The compressor stops for more than 3 minutes, Tpg_indoor> ice_temp_3+35.6°F, the compressorrecovers.7.1.4.6 The frequency limitation of modification rateIn the field which is controlled by high frequency, if the modification rate is not high enough, thecontrol-driven chip will enter into weak magnetic control, this will help to relieve the problem ofmodification rate. If during the course of weak magnetic control, the modification rate is still not highenough, enter into the control of decreasing frequency until the alarm of modification rate is relieved.7.1.4.7 Temperature protection of the outdoor cooling coilWhen the defrosting temperature and the sensor’s temperature are higher than 149°F , the frequency ofthe compressor decreases 1hz/10seconds. Keep the frequency until it decreases to the lowestfrequency. When the temperatures are lower than 149°F and higher than 140°F , keep the frequency ofthe compressor. When the temperatures are lower than 140°F , relieve the defrosting temperatureprotection.7.1.5 The control of the outdoor Electronic expansion valve (EEV)(09K series have no this function)In cooling mode, the EEV opening range is 90~480 steps. The EEV opening is 5 steps when unit is off.In heating mode, the EEV opening range is 60~480 steps. The EEV opening is 45 steps when unit isoff.After outdoor unit is off, the EEV opening keep the current on for 5 s, then open the EEV completely for2 minutes, then become 5 steps (cooling) or 45 steps (heating).The EEV opening will increase if SH (superheat degree) >0 while decrease if SH<0.Adjust frequency:If |SH|=0, 60s/ 1 stepIf |SH|≥3,and △SH=0, 10s/ 1 step.If 3≥|SH|≥0, 30s/ 1 step.△SH= current SH- last SHSH= Ts (suction temp)-Tc1 (indoor coil temp)-Tsh (fixed data, depend on different models, -1~2)20