Daikin Condensing Unit DX13SSA0363AD

Warning: This procedure requires trained personnel with PPE!

Enter the voltage reading between motor connections L and N

If voltage is not 230 volts, check the line voltage circuit to the motor

Enter the voltage reading from terminal C to either terminal 1, 2, 3, 4, or 5

If no voltage, check 24 volt circuit to motor

If voltage was present in steps 1 and 2, the motor has failed and will need to be replaced

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

WARNING: HIGH VOLTAGE! Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death.

The compressor contactor and other relay holding coils are wired into the low or line voltage circuits. When the control circuit is energized, the coil pulls in the normally open contacts or opens the normally closed contacts. When the coil is de-energized, springs return the contacts to their normal position.

NOTE: Most single phase contactors break only one side of the line (L1), leaving 115 volts to ground present at most internal components.

Leads removed from the holding coil?

Ohmmeter reading across the coil terminals

Relay or contactor replaced if coil does not test continuous?

Sign off on the contactor and/or relays check

WARNING: HIGH VOLTAGE! Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death.

The auto reset fan motor overload is designed to protect the motor against high temperature and high amperage conditions by breaking the common circuit within the motor, similar to the compressor internal overload. However, heat generated within the motor is faster to dissipate than the compressor, allow at least 45 minutes for the overload to reset, then retest.

Motor leads removed from its respective connection points and capacitor (if applicable)?

Continuity checked between each of the motor leads?

One probe of the ohmmeter touched to the motor frame (ground) and the other probe in turn to each lead?

Did the windings test continuous?

Was a reading obtained from lead to ground?

If the windings do not test continuous or a reading is obtained from lead to ground, replace the motor.

Sign off on the motor winding check

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 compressor rotation check

WARNING: HIGH VOLTAGE! Disconnect ALL power before servicing or installing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death.

Check wiring visually for signs of overheating, damaged insulation and loose connections.

Use an ohmmeter to check continuity of any suspected open wires.

If any wires must be replaced, replace with comparable gauge and insulation thickness.