Carrier 38QUS012D8S Service Manual page 100

1.3 Operation Modes and Functions
1.3.1 Fan Mode
(1) Outdoor fan and compressor cease operation.
(2) Temperature setting function is disabled, and no preset temperature is displayed.
(3) Louver operates the same as in cooling mode.
(4) Auto fan:
When it fan-only mode, operates the same as auto fan in cooling mode with the temperature set at 24℃.
1.3.2 Cooling Mode
1.3.2.1 Outdoor Fan Running Guidelines
The outdoor unit can run at different fan speeds depending on T4.
Fan speeds vary with the model of air conditioner.
18K
Fan speed is regulated according to T4 and compressor frequency.
Frequency linkage area:
Electrical Control System
T4
A+
A
Frequency linkage area
C
D
E
F
G
Electrical Control Function
98