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7-3. Outdoor Fan Speed Control (for model GR/GRV127L5)
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 unit detects a change in temperature, the controller (POW-
CL128E) on the electrical component box activates to control the fan speed automatically.
If the outdoor temperature falls below 14°C, the fan speed switches to MED.
If the outdoor temperature falls below –1°C, the fan speed switches to LOW.
14°C
Outdoor
temperature
–1°C
NOTE
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.
1
Fan speed
Fan motor output
3
HIGH
MEDIUM
5
LOW
7
(Line voltage 220-240V)
24
2
1 ( WHT-BRN )
1 ( VLT-BRN)
1 ( YEL-BRN )
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