General Assist Technical Reference
J Series Outdoor Unit Operational Control
Outdoor unit input, output and control range reference
Reference for J Series outdoor unit operation control, sensors, protection inputs, external inputs and controlled outputs.
This reference summarises the outdoor unit input / output list used by the J Series control system. It identifies the principal sensors, protection devices, external control inputs, compressor and valve outputs, communication signals and LED indication.
Service personnel only: Electrical measurements and control-system checks must be carried out by suitably qualified personnel. Isolate power where required and observe the applicable electrical and refrigerant safety procedures.
1. Outdoor unit inputs
Temperature and current sensing
| Input | Input / output part or detail | Control range / function |
|---|---|---|
| Discharge temperature sensor 1 | Thermistor | Measure range: -30 to 130°C |
| Heat exchanger liquid temperature sensor 1 | Thermistor | Measure range: -30 to 70°C |
| Heat exchanger temperature sensor (Middle) | Thermistor | Measure range: -30 to 70°C |
| Suction gas temperature sensor | Thermistor | Measure range: -30 to 40°C |
| Outdoor temperature sensor | Thermistor | Measure range: -30 to 60°C |
| Operation current sensor | Current trans | Current monitoring input |
| IPM over current sensor | IPM with built-in sensor | IPM over-current detection |
Communication and setting inputs
| Input | Detail | Function |
|---|---|---|
| Serial signal | Transmission signal from indoor unit | Indoor-to-outdoor communication |
| DIP-SW input | Dip-switch function | Outdoor unit operating / configuration settings |
Pressure protection inputs
| Input | Device | Protection point |
|---|---|---|
| Pressure SW 1 (Discharge) | Pressure switch | Pressure ≥ 609 ±15 psi (4.2 ±0.1 MPa) |
| Pressure SW 2 (Suction) | Pressure switch | Pressure ≤ 29 ±7 psi (0.2 ±0.05 MPa) |
External input wiring: The source specifies dry-contact inputs. Where a twisted-pair cable is used, the specified conductor size is 22 AWG with a maximum wire length of 25 m.
External control inputs
| Input | Function | Contact type |
|---|---|---|
| External input 1 | External input / RC priority | Dry contact |
| External input 2 | Setting of priority (Cooling / Heating) | Dry contact |
2. Outdoor unit outputs
| Output | Output part / detail | Control range / supply |
|---|---|---|
| Compressor (DC inverter) | Scroll compressor | 20 to 100 rps |
| Fan motor (Hi / Lo / OFF) | Fan motor | AC 208–240 V, 50/60 Hz |
| Expansion valve | EEV coil | Coil DC 12 V |
| 4-way valve 1 (Cooling or Heating) | Coil of 4-way valve | Coil AC 208–240 V, 50/60 Hz, 10 W |
| Solenoid valve 1 | Hot gas bypass | Coil AC 208–240 V, 50/60 Hz, 10 W |
| Solenoid valve 2 | Liquid injection bypass | Coil AC 208–240 V, 50/60 Hz, 10 W |
External output terminals
| Output | State | Electrical output |
|---|---|---|
| External output terminal 1 (Operation) | ON / OFF | DC 0 / 12 V, maximum 100 mA |
| External output terminal (Abnormal) | ON / OFF | DC 0 / 12 V, maximum 100 mA Twisted pair cable: 22 AWG, wire length ≤ 25 m |
Communication and indication outputs
| Output | Detail |
|---|---|
| Serial signal output | Transmission signal from outdoor unit |
| LED display | LED 1–6 |
3. Quick diagnostic reference
| Check | Reference value / function |
|---|---|
| Discharge thermistor | -30 to 130°C measuring range |
| Heat exchanger thermistors | -30 to 70°C measuring range |
| Suction gas thermistor | -30 to 40°C measuring range |
| Outdoor thermistor | -30 to 60°C measuring range |
| High-pressure protection | ≥ 609 ±15 psi (4.2 ±0.1 MPa) |
| Low-pressure protection | ≤ 29 ±7 psi (0.2 ±0.05 MPa) |
| Compressor speed | 20 to 100 rps |
| EEV coil | DC 12 V |
| 4-way / solenoid valve coils | AC 208–240 V, 50/60 Hz, 10 W |
| External outputs | DC 0 / 12 V, maximum 100 mA |
Service tip: When diagnosing an operational fault, first establish whether the control is receiving the expected sensor or protection input, then confirm the corresponding output command and electrical supply to the controlled component. This table provides the reference ranges and output specifications shown in the source material.
Technical reference based on J Series outdoor unit operation control information supplied to General Assist.