Daikin SUPER MULTI NX CTXS07JVJU Service Manual

Also see for FDXS12DVJU: Operation manual Installation manual Service manual Service manual

Contents

Daikin SUPER MULTI NX CTXS07JVJU Service Manual Manual pdf 76 page image

SiUS12-928_B Control SpecificationFunction and Control 683.13 Malfunctions3.13.1 Sensor Malfunction DetectionSensor malfunction may occur either in the thermistor or current transformer (CT) system.Relating to Thermistor Malfunction1. Outdoor heat exchanger thermistor2. Discharge pipe thermistor3. Radiation fin thermistor4. Gas pipe thermistor for each room5. Outdoor temperature thermistor6. Liquid pipe thermistorRelating to CT MalfunctionRefer to “CT or related abnormality” on page 179 for detail.3.13.2 Detection of Overcurrent and OverloadOutline In order to protect the inverter, an excessive output current is detected and the OL temperature isobserved to protect the compressor.Detail  If the inverter current exceeds 17 ~ 20 A (depending on the model), the system shuts down thecompressor. If the OL (compressor head) temperature exceeds 266°F (130°C) , the compressor stops.3.13.3 Refrigerant Shortage ControlOutline I : Detecting by power consumptionIf the power consumption is below the specified value and the frequency is higher than thespecified frequency, it is regarded as refrigerant shortage.The power consumption is low comparing with that in the normal operation when refrigerant isinsufficient, and refrigerant shortage is detected by checking power consumption.II : Detecting by discharge pipe temperatureIf the discharge pipe temperature is higher than the target discharge pipe temperature, and theoutdoor electronic expansion valve is fully open for more than the specified time, it is regarded asrefrigerant shortage.Refer to “Refrigerant shortage” on page 156 for detail.FrequencyPower consumption Refrigerant shortage zone(R11685)40 ~ 55 Hz(depending onthe model)(R1391)Refrigerant shortagezoneTarget dischargepipe temperature