Overview

The Airstage J-IVS indoor units include several configurable input and output terminals that allow external devices—such as switches, thermostats, and control systems—to interact with the unit.
These connections can control unit operation, stop/start functions, and communicate system status to Building Management Systems (BMS) or auxiliary equipment.

1. External Input Terminals

External input terminals are used to control or override indoor unit operation through external devices such as switches, contact sensors, or building control systems.

Available Inputs

| Function | Connector | Signal Type | Voltage / Contact | Notes |
|---------------|----------------|----------------|----------------------|
| Operation / Stop | CNA01 / CNA02 | Apply voltage or dry contact | DC 12–24 V | Enables or disables indoor operation |
| Emergency Stop | CNA01 / CNA02 | Apply voltage or dry contact | DC 12–24 V | Shuts down all indoor units in refrigerant system |
| Forced Thermostat Off | CNA03 / CNA04 | Apply voltage or dry contact | DC 12–24 V | Used for fan or thermostat control override |

Each input can be configured as Apply Voltage (12–24 V) or Dry Contact, selectable via DIP switches on the indoor PCB (see page 8–10 of the reference).

For multiple indoor units, wiring should be branched externally using relays to prevent circuit overload.

2. External Output Terminals

External output terminals provide operating status signals to other systems (e.g., lighting control, fan interlock, or monitoring systems).

Available Outputs

FunctionConnectorOutput VoltageStatus
Operation StatusCNB01 (1–2)12 V DCON = Running, OFF = Stopped
Error StatusCNB01 (3–4)12 V DCON = Fault detected
Indoor Unit Fan StatusCNB01 (5–6)12 V DCON = Fan operating
Auxiliary Heater OutputCNB01 (7–8)12 V DCON = Aux heater active

Maximum permissible current per output: 150 mA
Recommended wire: 0.33 mm² (22 AWG) twisted pair, max length 25 m

input output JIVS

.

3. Control Logic Examples

  • Emergency Stop:
    When the external circuit closes, the indoor and outdoor units in the same refrigerant group stop immediately.

  • Forced Thermostat Off:
    Used to suspend compressor operation when external control determines heating or cooling should pause (for example, energy management control).

  • Fan Control:
    When “Fan setting at thermostat off” is enabled, indoor fans continue for 1 minute after thermostat off, preventing temperature layering.

4. Wiring Guidance

  • Keep total wiring length within 25 m for output circuits and 150 m for low-voltage input circuits.

  • Always use shielded twisted pair cable for communication stability.

  • Maintain separation between signal and power wiring to prevent noise interference.

  • If multiple indoor units are connected, use individual relays for each to prevent cross-circuit current.

  • Verify polarity when using Apply Voltage inputs.

5. Optional Connection Kits

ModelPurpose
UTY-XWZXZBFor control input / output
UTY-XWZXZCFor auxiliary heater output
UTY-XWZXZEFor forced thermostat off port
UTY-XWZXZAFor output port on controllers

Optional kits provide pre-terminated connectors and cables for field installation.

6. Summary Table

Terminal TypeFunctionConnectorVoltageRemarks
InputOperation / StopCNA01 / CNA02DC 12–24 V / DryCommonly used for BMS control
InputEmergency StopCNA01 / CNA02DC 12–24 V / DryStops all indoor units in group
InputForced Thermostat OffCNA03 / CNA04DC 12–24 V / DryUsed for energy saving control
OutputOperation StatusCNB01 (1–2)12 V DCON = Running
OutputError StatusCNB01 (3–4)12 V DCON = Fault
OutputIndoor Fan StatusCNB01 (5–6)12 V DCON = Fan Running
OutputAux Heater StatusCNB01 (7–8)12 V DCON = Heater Active

7. Notes

  • Ensure correct DIP switch configuration for each terminal type.

  • “Edge” or “Pulse” mode can be selected for external input via DIP switch SET2-2 on the indoor PCB.

  • The default setting is Edge signal. Use Pulse mode for momentary control signals.

  • Use external relays or isolation devices when interfacing with third-party systems.