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SM830079
10. PROCESSES AND FUNCTIONS
(4) Outdoor Fan Speed Control (CL1852)
Low ambient fan speed control
• This function protects the compressor from being damaged due to flowback of the
liquid refrigerant to the compressor when the outdoor temperature is very low.
• When the air temp. thermistor (TH) on the outdoor units detects a change in tem-
perature, the controller on the electrical component box activates to control the
fanspeed automatically.
• If the outdoor temperature falls below 57°F, the fan speed switches to MED.
• If the outdoor temperature falls below 30°F, the fan speed switches to LOW.
57°F
30°F
Outdoor
temperature
Fan speed
*
1
Fan motor output
*
2
(Line voltage 115V or 230V)
HIGH
MEDIUM
LOW
3 – 1 (BLU–GRY) or (WHT–GRY)
5 – 1 (VLT–GRY)
7 – 1 (YEL–GRY)
1893_M_I
Fig. 11
*
1
Regardless of outdoor temperature, outdoor fan motor operates at first at HIGH
speed for 23 ± 5 seconds to give the motor an initial boost.
*
2
When the fan speed switches, the controller terminal’s location where line voltage
comes out (ࠗ–ࠗ) shifts accordingly.