Daikin Condensing Unit DX13SA0603AC

Warning: This procedure should be performed by trained personnel only

Is the liquid line warm to the touch?

If the liquid line is not warm, report the issue and stop the procedure

Is there a temperature drop at any point on the liquid line?

Is there frost formation at the point of restriction?

Is the unit showing normal to high subcooling?

Enter the pressure in the suction line

Does the low pressure control open its contacts on a drop in pressure?

Does the low pressure control automatically reset itself with a rise in pressure?

Enter the cut-out pressure for heat pumps

Enter the cut-out pressure for air conditioners

Enter the cut-in pressure for heat pumps

Enter the cut-in pressure for air conditioners

Does the control show continuity using a VOM?

Is the control replaced if not as above?

NOTE: The compressor may run backwards (noisy operation) for 1 or 2 seconds at shutdown. This is normal and does not harm the compressor.

Install gauges and verify that the suction pressure drops while the discharge pressure increases.

Listen for normal compressor sound levels. Reverse rotation results in elevated or unusual sound levels.

Reverse rotation will result in substantially reduced amp draw from tabulated values.

To correct improper rotation, switch any two power supply leads at the outdoor unit contactor.

The 3-phase scroll compressors are direction of rotation sensitive. They will rotate in either direction depending on the phasing of the power. There is no negative impact on durability caused by operating 3-phase compressors in reversed rotation.

The compressor’s internal protector will trip, de-energizing the compressor. Continued operation of 3-phase scroll compressors with the rotation reversed will contribute to compressor failure. All 3-phase scroll compressors should be checked for correct phase rotation.

Sign off on the 3-Phase Scroll Compressor Rotation Check

Warning: This procedure requires trained personnel with PPE!

Attach thermometer to the liquid line and record the temperature

Install a high side pressure gauge and record the pressure

Enter the design subcooling from the technical information manual

Find the hi-pressure value on the 'Required Liquid Line Temperature' chart and record the temperature

Convert the liquid line pressure gauge reading to temperature using the Temperature - Pressure Chart and record the temperature

Calculate the difference between the thermometer reading and pressure to temperature conversion to find the amount of subcooling

Enter the design subcooling range for your unit from the specification sheet or technical information manual

Sign off on the subcooling check

Voltage reading at motor connections L and N

Is the voltage reading 230 volts?

Voltage reading from terminal C to either terminal 1, 2, 3, 4, or 5

Is the voltage reading 24 volts?

Note: When replacing motor, ensure the belly band is between the vents on the motor and the wiring has the proper drip loop to prevent condensate from entering the motor.