Haier HSU24VCK Service Manual

Also see for HSU18VCK: Installation manual Service manual

HSU24VCK-SM Functions and ControlDomesticAirConditioner105ˊFunctions and control5.1 main functions and control specificationsIncluding brief introduction to air conditioners of series models and electric control function.5.1.1 Automatic running(1) Single cold automatic run mode:After entering into this mode, the main control “MCU” determines the corresponding work pattern accordingto the indoor temperature so as to maintain the preset temperature (the preset temperature is 78° F). Whenthe indoor temperature is below 78° F, outlet air from compressor is off, the automatic wind from fan motoris low, and wind can be set to high, medium or low by hand. When the indoor temperature is or above 78° F,the unit enters the cooling mode and conducts the cooling programme (the preset temperature is 78° F),outlet air from compressor is on and indoor fan motor run in fixed wind speed5.1.2 Indoor temperature controlTemperature control range : 60°F ---86°FTemperature control precision: ±2°FCompressor can’t be controlled by temperature sensor within 2 minutes after it startsķ Cooling mode:When Tr> Ts, outdoor fan motor and compressor on, and indoor fan motor run at fixed wind speed. When Tr< Ts, outdoor fan motor and compressor off, and when Tr > Ts, outdoor fan motor and compressor are workingagain .If Tr=Ts, the indoor fan motor , outdoor fan motor and the compressor’s state will not change.5.1.3 Cooling run mode:emperature control range : 60°F---86°Ftemperature control precision:±2°Fcompressor can’t be controlled by temperature sensor within 2 minutes after it starts.control character: when Tr≥Ts, outlet air from compressor is on and indoor fan motor run at fixed windspeed. When Tr<Ts, outlet air from compressor is off , and when Tr>Ts,outlet air from compressor is on.wind speed control: (the temperature difference is 1? )auto: whenTr>=Ts+5°F , the wind speed is high;When Ts+1°F ≤TrWhen Tr<Ts+1°F , the wind speed is low.When temperature sensor is off, the fan motor runs at low speed.when the wind speed changes from low to high, thereis no delayand when it changes from high to low,there is a 3-minutes delay before conversion.Manual operation:When unit is on the wind speed can be set to high, medium, low or automatic as required(execute instruction 2 seconds later after receiving remote signal)Compressor control喚The compressor can’t be controlled by temperature sensor within 2 minutes after startup and can be only restarted at least 3 minutes later after shutdown. There is no 3-minute protection with power onfor the first time (over 3 minutes withpoweroff). The compressor must stands by for 3 minutes before it isrestarted after shut down.There is no 2-minute limit when changing the temperature setting or shutting down the machine throughtheremote controller, and the machine can be shut down immediately.Avoiding electrical shock: outlet air is available 2 seconds later after startup.High temperature expiration protection: