Special Cooling Operation (For 18–36 Models)

This feature helps the unit run more smoothly when outdoor temperatures are low.

How It Works

• The unit operates only in Cooling Mode.

• Airflow is fixed at High speed.

• The temperature range is automatically set between 76°F (24°C) and 88°F (30°C).

• The outdoor unit can run in outdoor temperatures as low as -4°F (-20°C) and as high as 122°F (50°C).

When to Use

• This function is designed for situations where cooling is needed during cooler outdoor weather (e.g., server rooms, special process areas).

• Most homeowners do not need this function for everyday cooling.

Recommended Operation for Lower Set Points

• If a cooler indoor temperature is required, follow the same principle as special cooling:

  • Set fan speed to High → This keeps system pressures more stable.

  • Adjust thermostat to the desired temperature.

• Be aware:

  • The unit will not shut down because of temperature lockout.

  • It may, however, shut down due to low-pressure safety if conditions are too extreme.

  • If this happens, the unit will stop, then restart automatically once conditions stabilize.

  • This type of trip is uncommon, but more likely if the outdoor temperature drops below -10°F (-23°C).

Settings

• Default (factory) setting: Disabled

• Can be changed to:

  • 00 = Disabled

  • 01 = Enabled

Important Notes

• Do not use this function if the system is set to “Heating Only.”

• A wired remote controller is required to enable this function.

• If this function is enabled, the unit may start cooling automatically even if the remote controller is not communicating.

• If condensation (dew) forms on the indoor unit, change the setting back to Disabled (00).

✅ Recommendation: Leave this function disabled unless instructed by a service professional, or if you specifically need cooling at lower outdoor temperatures.