GENERAL Assist Technical Reference
AOTG60LBTA – Low Noise Mode
External input wiring and outdoor PCB local setting procedure
For technicians configuring low-noise operation on the AOTG60LBTA outdoor unit.
What Low Noise Mode does: Low Noise Mode reduces outdoor-unit operating sound when the external low-noise input is active. Depending on operating conditions, including outdoor temperature, product performance may be reduced while this mode is active.
Before changing settings: Stop air-conditioner operation before carrying out the outdoor PCB local-setting procedure. Any external switch or timer must use a suitable volt-free contact circuit and be wired in accordance with the installation instructions.
1. How Low Noise Mode operates
The outdoor unit can be placed into Low Noise Mode by closing an external contact connected to the outdoor control PCB. A commercial timer or ON/OFF switch may be used as the external control device.
| External input | Outdoor unit operation |
|---|---|
| ON / contact closed | Low Noise Mode active |
| OFF / contact open | Normal operation |
Important: Low Noise Mode changes the outdoor unit's operating behaviour to reduce sound. It is normal for available capacity to be reduced under some conditions.
2. External input wiring – CN10
| Item | Requirement |
|---|---|
| Outdoor PCB connector | CN10 – Low Noise Mode input |
| Contact capacity | 24 V DC or more, 10 mA or more |
| Maximum distance | 10 m (33 ft) between outdoor PCB and connected device |
| External device | Locally purchased switch, timer or equivalent contact device |
| Optional connection lead | UTY-XWZXZ3 external connect kit |
Simplified circuit
| Outdoor control PCB CN10 pins 1–2 | → | UTY-XWZXZ3 / connection cable Maximum 10 m | → | External switch / timer Contact closes = Low Noise ON |
3. Set the Low Noise level on the outdoor PCB
Use the outdoor PCB pushbuttons SW1–SW5. The reference identifies these as:
| Switch | Function |
|---|---|
| SW1 | MODE |
| SW2 | SELECT |
| SW3 | ENTER |
| SW4 | EXIT / INITIALIZE |
| SW5 | PUMP DOWN |
1
Stop the air conditioner. Function setting is to be carried out with operation stopped.
2
Press and hold MODE (SW1) for 3 seconds or more to enter Local Setting Mode.
3
Confirm the POWER/MODE LED blinks 9 times, then press ENTER (SW3).
4
Press SELECT (SW2) until the Low Noise setting is indicated: L2 OFF / L3 BLINKING.
5
Press ENTER (SW3). The Low Noise selection is accepted and L3 changes from blinking to ON.
6
Press SELECT (SW2) to choose Mode 1 or Mode 2 using the L4–L6 LED pattern shown below.
7
Press ENTER (SW3) to save the selected mode.
8
Press EXIT (SW4) to return to the normal operating-status display.
Low Noise level LED patterns
| Setting | L4 | L5 | L6 |
|---|---|---|---|
| Mode 1 – while selecting | OFF | OFF | BLINK |
| Mode 2 – while selecting | OFF | BLINK | OFF |
| Mode 1 – after ENTER | OFF | OFF | ON |
| Mode 2 – after ENTER | OFF | ON | OFF |
If you lose your place in the setting sequence: Press EXIT (SW4) once to return to normal operation, then restart the setting procedure from the beginning. Do not guess how many SELECT or ENTER presses have already been made.
4. Technician quick reference
| Check | Expected result |
|---|---|
| External input connector | CN10 |
| Contact open | Normal operation |
| Contact closed | Low Noise Mode active |
| Maximum control-cable distance | 10 m (33 ft) |
| Optional lead | UTY-XWZXZ3 |
| Enter Local Setting Mode | Hold SW1 MODE for at least 3 seconds |
| Entry confirmation | POWER/MODE LED blinks 9 times |
| Return to normal display | Press SW4 EXIT |
Source scope: This reference reproduces the Low Noise Mode wiring and local-setting information shown in the supplied technical material. The supplied pages identify Mode 1 and Mode 2 but do not state the exact sound-reduction value or capacity limit associated with each level, so no unsupported values have been added here.