General Assist Technical Reference

VII Outdoor Unit Input and Output List

Sensors, outputs, communications, external I/O and LED indication reference
This reference summarises the outdoor unit input and output points shown in the service information, including sensor ranges, pressure-switch values, controlled loads, communication paths and external terminals.
Service safety: Electrical measurements and testing must only be carried out by appropriately qualified personnel. Isolate power before accessing wiring or components unless live testing is specifically required by the applicable service procedure.

1. Outdoor unit inputs

InputTypeControl / measurement range
Discharge pressure sensorPressure sensor0.0 to 5.0 MPa
Suction pressure sensorPressure sensor0.0 to 1.7 MPa
Discharge temperature sensor 1Thermistor10 to 130°C
Discharge temperature sensor 2Thermistor10 to 130°C
Outdoor temperature sensorThermistor-25 to 58°C
Suction temperature sensorThermistor-35 to 70°C
Heat exchanger temperature sensorThermistor-35 to 70°C
Liquid temperature sensor 1Thermistor-35 to 70°C
Liquid temperature sensor 2Thermistor-35 to 70°C
Sub-cool heat exchanger inlet sensorThermistor-35 to 70°C
Sub-cool heat exchanger outlet sensorThermistor-35 to 70°C
Compressor temperature sensor 1Thermistor10 to 130°C
Compressor temperature sensor 2Thermistor10 to 130°C
Operation current sensorCurrent transformerNot specified in source table
Pressure switch 1 (inverter compressor)Pressure switchOpen 4.2 MPa / Short 3.2 MPa
Pressure switch 2 (constant speed compressor)Pressure switchOpen 4.2 MPa / Short 3.2 MPa
Rotary SW / DIP-SW / Push SWAddress and function settingRefer to applicable setup procedure
Pressure switch quick reference: Both pressure switches are shown as opening at 4.2 MPa and returning to the short/normal state at 3.2 MPa.

2. Outdoor unit outputs

OutputType / functionControl range
Compressor 1 (inverter)Magnetic relayOperation coil AC220-240 V, 50 Hz
Compressor 2Magnetic relayOperation coil AC220-240 V, 50 Hz
Electronic expansion valve 1 (Main)EEV coilOperating voltage DC12 V
Electronic expansion valve 2 (SC-Hex)EEV coilOperating voltage DC12 V
Fan motorDC brushless motor-
4-way valve 14-way valve coilAC220-240 V, 50/60 Hz, 8/5 W
Solenoid valve 1Hot gas bypassAC220-240 V, 50 Hz, 8 W
Solenoid valve 2INV compressor pressure equalizing valveAC220-240 V, 50 Hz, 6 W
Solenoid valve 3ACM oil return valve 1AC220-240 V, 50 Hz, 6 W
Solenoid valve 5EEV1 bypass valveAC220-240 V, 50 Hz, 8 W
Solenoid valve 6INV compressor oil release valveAC220-240 V, 50 Hz, 6 W
Crank case heater 1For inverter compressorAC240 V, 25 W
Crank case heater 2For constant speed compressorAC240 V, 35 W
Base heaterField supplyAC220-240 V, 35 W

3. Communication input / output

CommunicationDirection
LON WORKSIndoor unit ↔ Outdoor unit
Inverter communicationOutdoor unit internal communication
Outdoor unit communicationOutdoor unit ↔ Outdoor unit

4. External input / output

External inputs - dry contact

ConnectorFunctionInput type
CN131Low noise mode operationDry contact input
CN132Cooling / Heating priorityDry contact input
CN133Outdoor unit operation peak controlDry contact input
CN134Emergency stop operationDry contact input

External outputs

ConnectorFunctionLogicControl output
CN136Error displayON = Error / OFF = NormalDC 0 / 12-24 V, Max. 30 mA
CN137Operation displayON = Operation / OFF = StopDC 0 / 12-24 V, Max. 30 mA

5. LED display

DisplayPurpose
Single LED 101Displays operation, error and setting information using the single LEDs and 7-segment LED.
Single LED 102
7-segment LED
Reference note: This article reproduces the values and descriptions shown in the supplied service-information table. Where the source does not provide a control range or test method, none has been added.