General Assist Technical Reference

Low Noise and Peak Cut - External Input and Output

Applicable outdoor units: AOTG30-54LATL
External contact control for noise reduction, demand limitation and status outputs.
The outdoor control PCB provides two external inputs and two external outputs. Low Noise Mode and Peak Cut Mode are activated by closing a field-supplied contact. Error and compressor status can be passed to a building management or monitoring device.
Electrical work: Installation and PCB setting changes must be completed by a suitably qualified technician. Isolate power before connecting or disconnecting plugs, and discharge static electricity before touching the outdoor PCB.

1. Connector allocation

FunctionConnectorSignal type
Low Noise ModeCN10External input - closed contact activates the function.
Peak Cut ModeCN11External input - closed contact activates the function.
Error StatusCN12External output - active when a malfunction occurs.
Compressor StatusCN13External output - active while the compressor is running.
External Connect Kit: UTY-XWZXZ3 is required for each external input or output connection. Keep the cable distance from the outdoor PCB to the connected device within 10 m.

2. Low Noise Mode - CN10

Low Noise Mode reduces the normal operating sound of the outdoor unit. Capacity may reduce depending on outdoor temperature and system load.

InputOperation
Contact closed / ONLow Noise Mode active.
Contact open / OFFNormal operation.


3. Peak Cut Mode - CN11

Peak Cut Mode suppresses the outdoor unit input current to a selected percentage of rated input. This can support demand-management or site power-limitation requirements.

InputOperation
Contact closed / ONPeak Cut Mode active at the percentage selected on the PCB.
Contact open / OFFNormal operation.
Important: The selectable values are percentages of rated input. A setting of 100% allows rated input, while 50% or 75% limits input to that proportion. A 0% setting prevents normal compressor input while the Peak Cut signal is active.

4. External outputs - CN12 and CN13

OutputActive conditionElectrical limit
CN12 - Error StatusOutput turns ON when a system malfunction occurs.External supply: DC 24 V or less. Recommended load: DC 500 mA or less.
CN13 - Compressor StatusOutput turns ON while the compressor is operating.External supply: DC 24 V or less. Recommended load: DC 500 mA or less.


5. Outdoor PCB setting procedure

Before changing settings: Stop the air conditioner. The outdoor PCB buttons are SW1 MODE, SW2 SELECT, SW3 ENTER, SW4 EXIT and SW5 PUMP DOWN.


Set the Low Noise level

  1. Press and hold MODE (SW1) for at least 3 seconds to enter Local Setting Mode.
  2. Confirm the POWER/MODE LED blinks 9 times, then press ENTER (SW3).
  3. Press SELECT (SW2) until the Low Noise Mode selection is displayed, then press ENTER (SW3).
  4. Use SELECT (SW2) to choose Mode 1 or Mode 2 according to the L4-L6 LED pattern shown in the manual.
  5. Press ENTER (SW3) to save.
  6. Press EXIT (SW4) to return to the normal operating status display.

Set the Peak Cut input ratio

  1. Press and hold MODE (SW1) for at least 3 seconds.
  2. Confirm the POWER/MODE LED blinks 9 times, then press ENTER (SW3).
  3. Press SELECT (SW2) until the Peak Cut Mode selection is displayed, then press ENTER (SW3).
  4. Use SELECT (SW2) to choose 0%, 50%, 75% or 100% of rated input according to the L4-L6 LED pattern.
  5. Press ENTER (SW3) to save.
  6. Press EXIT (SW4) to return to the normal operating status display.

6. Quick commissioning check

StepCheck
1Confirm the correct UTY-XWZXZ3 lead is connected to the required PCB connector.
2Confirm contact and cable ratings, polarity where applicable, and cable length of 10 m or less.
3Set the Low Noise level or Peak Cut percentage before testing the input.
4Operate the external contact and confirm the relevant PCB LED indication and system response.
5Label the field wiring and record the selected setting in the commissioning documentation.
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