Daikin FTK(X)M-P Series Service Manual

Also see for FTKM18PVMK: Service manual Operation manual

Contents

Daikin FTK(X)M-P Series Service Manual Manual pdf 58 page image

Control Specification SiMT041509E43 Function and Control3.12 Discharge Pipe Thermistor Disconnection ControlOutline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipetemperature with the condensation temperature. If the discharge pipe thermistor isdisconnected, the electronic expansion valve opens according to the outdoor temperature andthe operation frequency, operates for a specified time, and then stops.After 3 minutes, the operation restarts and checks if the discharge pipe thermistor isdisconnected. If the discharge pipe thermistor is disconnected, the system stops after operatingfor a specified time.If the disconnection is detected repeatedly, the system is shut down. When the compressor runsfor 60 minutes without any error, the error counter is reset.Detail Determining thermistor disconnectionWhen the starting control finishes, the detection timer for disconnection of the discharge pipethermistor (540 seconds) starts. When the timer is over, the following adjustment is made.1. When the operation mode is coolingWhen the following condition is fulfilled, the discharge pipe thermistor disconnection isascertained.Discharge pipe temperature + 6°C < outdoor heat exchanger temperature2. When the operation mode is heatingWhen the following condition is fulfilled, the discharge pipe thermistor disconnection isascertained.Discharge pipe temperature + 6°C < indoor heat exchanger temperatureWhen the thermistor is disconnectedWhen the disconnection is ascertained, the compressor continues operation for 9 minutes andthen stops.If the compressor stops repeatedly, the system is shut down.3.13 Malfunctions3.13.1 Sensor Malfunction DetectionSensor malfunction can be detected in the following thermistor:1. Outdoor heat exchanger thermistor2. Discharge pipe thermistor3. Radiation fin thermistor4. Outdoor temperature thermistor3.13.2 Detection of Overcurrent and OverloadOutline An excessive output current is detected and the OL temperature is observed to protect thecompressor.Detail If the OL (compressor head) temperature exceeds 130°C, the system shuts down thecompressor. If the inverter current exceeds 18.0 A, the system shuts down the compressor.