LG AR-DR12-05A Installation And Operation Manual page 45

Start Up Procedure
Special Tools Required
• Voltage Meter (with wire probes)
• Amperage Meter
• Pressure Gauges – (refrigerant)
• Tachometer
• Thermometer
• Incline manometer or equivalent
The unit will be in operational mode during start-up. Use necessary precautions to avoid injury. All data must be collected while the unit is
running.
1. Make sure Pre-Start-Up checklist is complete.
2. Jumper R to G, R to Y1, and R to Y2 (if applicable) on the control board.
3. Turn the disconnect on. After 3 minutes compressors will come on. Make sure all fans and compressors are rotating the correct direc-
tion.
4. Allow the unit to run until the refrigerant system stabilizes. Approximately 1-2 minutes.
Voltage Imbalance
In a 3-phase system, excessive voltage imbalance between phases will cause motors to overheat and eventually fail. Maximum allowable
imbalance is 2%. To determine voltage imbalance, use recorded voltage measurements in this formula.
Key: V1, V2, V3 = line voltages as measured VA (average) = (V1 + V2 + V3) / 3
VD = Line voltage (V1, V2 or V3) that deviates farthest from average (VA)
Formula: % Voltage Imbalance = [100 x (VA-VD)] /VA
Due to our policy of continuous product innovation, some specifications may change without notification.
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START UP UNIT
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