Haier 1U71S2SG1FA Service Manual

Also see for 1U71S2SG1FA: Installation manual Service manual Installation manual

Contents

2031.3.6 Control for Discontinuous OperationAfter the unit starts up in cooling/heating mode, in 5 minutes, the compressor run/stop will not be controlled bythe room temp., but after changing the set temp., if compressor stop condition can be met, the system will stopcompressor immediately.1.3.7 Anti-Cold Air ControlIn heating mode, after compressor startup, the system will control indoor fan motor according to indoor coiltemperature. Detailed operation is as below:℃Note:1) The data in the parentheses is the control point when Tao>10 o C;2) Indoor unit will send "pre-heat" signal to wired controller in anti-cold air period.1.3.8. Fan Motor Control in DefrostingA. On receiving outdoor defrosting signal, indoor unit will stop after blowing remaining heat at slow speed for 20seconds.B. In defrosting period, indoor fan motor stops running.C. Defrosting is over, and indoor motor will run as anti-cold air state.1.3.9 Blowing Remaining Heat OperationWhen the unit shuts off in heating mode or the thermostat is OFF, indoor motor will stop running after running at lowspeed for 30 seconds.1.3.10 Swing Motor ControlIndoor unit will control the swing motor according to the swing signal from the wired controller.1.3.11 Water Pump ControlA: Water pump will be electrified when indoor unit enters non-heating mode until indoor unit stops. 5 minutes laterafter indoor unit stops, water pump will stop.B: When indoor unit is in heating mode, water pump will not operate.C: In OFF state and in any mode, once float switch signal is measured, indoor unit will send OFF signal to outdoorand send the failure code of drainage system to the wired controller, then the water pump will work until the floatswitch signal is cancelled. After water pump is forced to run for 5 minutes, indoor unit will be back to normal state.º°°