Abbreviation; Fan Mode; Cooling Mode; Heating Mode(Heat Pump Units) - Midea AURORA ONOFF Series Service Manual

3.2

Abbreviation

Unit element abbreviations
Abbreviation Element
T1 Indoor room temperature
T2 Coil temperature of evaporator
T3 Coil temperature of condenser
T4 Outdoor ambient temperature
TS Set temperature
In this manual, such as I
setting parameter of EEPROM.
3.3

Fan Mode

When fan mode is activated:
• The outdoor fan and compressor are stopped.
• Temperature control is disabled and no temperature
setting is displayed.
• The indoor fan speed can be set to high, medium, low,
or auto.
• The louver operations are identical to those in cooling
mode.
• Auto fan: In fan-only mode, AC operates the same as
auto fan in cooling mode with the temperature set at
24°C(75.2°F).
3.4

Cooling Mode

3.4.1 Compressor Control
• When indoor room temperature T1 is lower than
setting value, the compressor and outdoor fan cease
operation.
3.4.2 Indoor Fan Control
• In cooling mode, the indoor fan operates continuously.
The fan speed can be set to high, medium, low, turbo
or auto.
• The auto fan acts as below rules:
T1-Ts
, TE1, TE2...etc., they are well-
defrost
High
Medium
Low
 Product Features 5
3.4.3 Outdoor Fan Control
Outdoor units just have one single fan speed. The
operation of outdoor fan is consistent with the operation
of compressor. Except the following situations:
• Condenser high temperature protection
• Current protection
3.4.4 Condenser Temperature Protection(For
the units have T3 sensor)
When condenser temperature is more than setting value,
the compressor ceases operation.
3.4.5 Evaporator Temperature Protection
When evaporator temperature drops below a configured
value, the compressor and outdoor fan cease operation.
3.5

Heating Mode(Heat pump units)

3.5.1 Compressor Control
Once the compressor starts up, it will keep running for
7 minutes, then indoor room temperature T1 is higher
than setting value, the compressor and outdoor fan cease
operation.
3.5.2 Indoor Fan Control:
• When the compressor is on, the indoor fan speed can
be set to high, medium, low, or auto. And the anti-
cold wind function has the priority.
• Anti-cold air function
• When indoor unit coil temperature T2 is low, the
anti-cold air function will start and the indoor fan is
controlled by indoor unit coil temperature T2.
For 18K and below models:
