Daikin Condensing Unit DX13SN0241BB

WARNING: Disconnect ALL power before servicing.

Heater element assembly removed to expose fuse link

Continuity test across the fuse link performed with an ohmmeter

No reading on ohmmeter indicating the link is open

Fuse link replaced if necessary

NOTE: The link is designed to open at approximately 333°F. DO NOT WIRE AROUND - determine reason for failure.

Sign off on the heater fuse link 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.

A step-down transformer (208/240 volt primary to 24 volt secondary) is provided with each indoor unit. This allows ample capacity for use with resistance heaters. The outdoor sections do not contain a transformer (see note below).

WARNING: Disconnect ALL power before servicing.

Control panel cover removed to gain access to transformer

WARNING: Line Voltage now present.

Voltage across secondary voltage side of transformer (R to C)

No voltage indicates faulty transformer, bad wiring, or bad splices.

Transformer primary voltage at incoming line voltage connections and/or splices

If line voltage available at primary voltage side of transformer and wiring and splices good, transformer is inoperative. Replace.

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 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 line?

Is there frost formation at the point of restriction?

Is the unit showing normal to high subcooling?

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.

Remove the leads from the compressor terminals. See warnings S-17 before removing compressor terminal cover.

Fuse, circuit breaker, ground fault protective device, etc. has not tripped.

Enter the reading for continuity between terminals S-R

Enter the reading for continuity between terminals C-R

Enter the reading for continuity between terminals C-S

If either winding does not test continuous, replace the compressor.

NOTE: If an open compressor is indicated, allow ample time for the internal overload to reset before replacing compressor.

Sign off on the resistance test