Daikin Condensing Unit DX13SA0604AD

WARNING: Line Voltage now present.

With power ON, thermostat calling for cooling

1. Use a voltmeter to check for 24 volts at thermostat wires C and Y in the condensing unit control panel.

2. No voltage indicates trouble in the thermostat, wiring or external transformer source.

3. Check the continuity of the thermostat and wiring. Repair or replace as necessary.

WARNING: Line Voltage now present.

1. Set fan selector switch at thermostat to “ON” position.

WARNING: Discharge capacitor through a 20 to 30 OHM resistor before handling.

NOTE: You can do this test with a multi-meter if you have a Capacitance meter on your multi-meter.

Capacitor removed from the circuit

Multi-meter set to 'Capacitance'

Capacitor terminals connected to the multi-meter leads

Enter the reading from the multi-meter

Enter the actual value of the capacitor (i.e. the printed value on the capacitor)

Is the reading near to the actual value of the capacitor?

If the reading is significantly lower or none at all, is the capacitor replaced?

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.

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: To avoid the risk of fire or explosion, never use oxygen, high pressure air or flammable gases for leak testing of a refrigeration system.

WARNING: To avoid possible explosion, the line from the nitrogen cylinder must include a pressure regulator and a pressure relief valve. The pressure relief valve must be set to open at no more than 150 psig.

Pressure test the system using dry nitrogen and soapy water to locate leaks.

If you wish to use a leak detector, charge the system to 10 psi using the appropriate refrigerant then use nitrogen to finish charging the system to working pressure, then apply the detector to suspect areas.

If leaks are found, repair them.

After repair, repeat the pressure test.

If no leaks exist, proceed to system evacuation.