Daikin Condensing Unit DX13SA0483AD

Warning: Line Voltage now present.

Outer case, control panel cover, etc., removed from unit being tested

Voltage across terminals L1 and L2 of the contactor or at the field connections for the air handler or heaters

No reading - indicates open wiring, open fuse(s) no power or etc., from unit to fused disconnect service. Repair as needed.

Ample voltage at line voltage connectors, unit energized

Voltage with the unit starting and operating

Locked rotor voltage within the voltage tabulation as shown

If the voltage falls below the minimum voltage, check the line wire size. Long runs of undersized wire can cause low voltage. If wire size is adequate, notify the local power company in regard to either low or high voltage.

Warning: This procedure requires trained personnel with PPE!

Attach a photo of the thermometer or thermocouple type temperature tester attached to the liquid line

Attach a photo of the high side pressure gauge installed on the high side service valve

Record the temperature of the line

Enter the design subcooling obtained from the technical information manual or specification sheet

Enter the hi-pressure reading from the 'Required Liquid Line Temperature' chart

Enter the temperature conversion from the liquid line pressure gauge reading

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.

Disconnect wire leads from terminals 2 and 4 of Fan Relay Cooling and 2 and 4, 5 and 6 of Fan Relay Heating.

Using an ohmmeter, test between 2 and 4 - should read open. Test between 5 and 6 - should read continuous.

WARNING: Line Voltage now present.

With power ON, energize the relays.

Using an ohmmeter, test between 2 and 4 - should read continuous . Test between 5 and 6 - should read open.

If not as above, replace the relay.

Sign off on the Fan Relay Contact 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.

Charge the system to 10 psi using the appropriate refrigerant

Use nitrogen to finish charging the system to working pressure

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.

WARNING: Hermetic compressor electrical terminal venting can be dangerous.

If the compressor terminal PROTECTIVE COVER and gasket (if required) are not properly in place and secured, there is a remote possibility if a terminal vents, that the vaporous and liquid discharge can be ignited, spouting flames several feet, causing potentially severe or fatal injury to anyone in its path.

Ignition of the discharge can also occur at the venting terminal or inside the compressor, if there is sufficient contaminant air present in the system and an electrical arc occurs as the terminal vents.

Therefore, proper evacuation of a hermetic system is essential at the time of manufacture and during servicing.

To reduce the possibility of external ignition, all open flame, electrical power, and other heat sources should be extinguished or turned off prior to servicing a system.

Compressor terminal PROTECTIVE COVER and gasket properly in place and secured

Proper evacuation of a hermetic system performed

All open flame, electrical power, and other heat sources extinguished or turned off prior to servicing

Sign off on the compressor check