– 29 –
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 (
j
–
j
) shifts accordingly.
