Haier AW09ES2VHB Service Manual

Also see for 1U09AP2VHA: Installation manual

Contents

SEQUENCE OF OPERATIONPAGE 25ENGLISHAuto ModeWith the system turned on, press the AUTO button on theremote control. The system will change to the auto mode ofoperation.As the room is cooled or heated, the system will automati-cally switch between cool mode, fan mode, and heat mode.There is a minimum 15 minute operating time between modechanges.Dry ModeOverviewThe temperature control range in Dry mode is 60°F - 86°F.This mode is used for the purpose of dehumidification.(Tr = room temperature Ts = set temperature)When Tr > Ts + 4°F, the compressor will turn on and the indoorfan will operate at the set speed.When Ts ≤ Tr ≤ Ts + 4°F, the compressor will operate at thehigh dry frequency for 10 minutes, then at the low dry modefor 6 minutes. The indoor fan will operate at low speed.When Tr < Ts, the outdoor unit will stop, and the indoor fan willstop for 3 minutes, then operate at the low speed option.Automatic fan speed:When Tr >= Ts + 9°F, High speedWhen Ts + 5.4°F ≤ Tr < Ts + 9°F, Medium speedWhen Ts + 3.6°F ≤ Tr < Ts + 5.4°F, Low speedWhen Tr < Ts + 3.6°F, Light speedNote: TURBO and QUIET mode must be set using the remotecontroller.If the outdoor fan is stopped, the indoor fan will pause for 3minutes.If the outdoor fan is stopped for more than 3 minutes, and thecompressor is still operating, the system will change to lightspeed mode.Indoor unitTo enter the dry mode, point the infrared remote control atthe indoor unit and press the power button, then press theDRY mode button if not already set to dry mode.The signals received by the infrared receiver are relayed tothe main board of the indoor unit to turn the system on andset it to dry mode.The indoor unit main board will activate the display of theindoor unit, illuminating the display, indicating the room tem-perature and current status of the unit.The indoor unit main board will signal the louver stepper mo-tor to open the louver to either a stationary position, or oneof several oscillating modes.As the louver opens, the indoor unit main board will power upthe indoor fan motor, operating the fan at the speed last set.The indoor fan motor has a feedback circuit which providesthe indoor unit main board with information for controllingthe speed of the fan motor. (See overview section for moreinformation.)Temperature SensorsThe indoor unit has two sensors that provide temperatureinformation to the indoor unit main board. An indoor ambienttemperature sensor, and coil temperature sensor are used forcontrolling the system during dry mode. The resistance val-ues of the sensors will vary with temperature. The resistanceto temperature values can be found using a temperature /resistance chart specific to the sensor being checked.CommunicationThe indoor and outdoor unit main boards communicate viaa digital signal on the wire connected to terminal 3C of eachunit. A splice or break in this wire will cause a communicationerror.When a command is received from the remote control, theindoor unit main board communicates with the outdoor unitmain board via the terminal 3C wire to perform the requestedfunction.Outdoor UnitUpon a request for dry mode, the outdoor unit main boardapplies power to the outdoor fan motor and compressor.Depending on system cycling, there may be up to a 3 minutewait period before the compressor and outdoor fan start.)WARNING: Do not measure compressor voltages, damage tothe volt meter may result.The outdoor unit main board also controls the position ofthe EEV (Electronic Expansion Valve) to regulate the flow ofrefrigerant to the indoor unit evaporator coil.Temperature SensorsFour temperature sensors located in the outdoor unit providetemperature information to the outdoor unit main board forcontrol of the system during dry mode.The outdoor ambient temperature sensor provides the tem-perature of the air drawn into the outdoor coil of the outdoorunit.The defrost temperature sensor provides the temperaturesensed at the output of the outdoor coil.