Ground Test; Operation Test - Daikin M Series Service And Troubleshooting

SERVICING
Testing Compressor Windings
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.

Ground Test

If fuse, circuit breaker, ground fault protective device, etc.
has tripped, this is a strong indication that an electrical
problem exists and must be found and corrected. The
circuit protective device rating must be checked and its
maximum rating should coincide with that marked on the
equipment nameplate.
With the terminal protective cover in place, it is acceptable
to replace the fuse or reset the circuit breaker ONE TIME
ONLY to see if it was just a nuisance opening. If it opens
again, DO NOT continue to reset.
Disconnect all power to unit, making sure that all
power legs are open.
1. Carefully remove the compressor terminal protective
cover and inspect for loose leads or insulation breaks
in the lead wires.
2. Disconnect the three leads going to the compressor
terminals at the compressor or nearest point to the
compressor.
3. Check for a ground separately between each of the
three terminals and ground (such as an unpainted
tube on the compressor). If there is any reading of
continuity to ground on the meter, the compressor
should be considered defective.
4. If ground is indicated, replace the compressor.
Damage can occur to the glass embedded terminals if the
leads are not properly removed. This can result in terminal
and hot oil discharging.
Compressor Ground Test

Operation Test

If the voltage, capacitor, overload and motor winding test
fail to show the cause for failure:
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.
1. Remove unit wiring from disconnect switch and wire
a test cord to the disconnect switch.
NOTE: The wire size of the test cord must equal the
line wire size and the fuse must be of the proper size
and type.
2. With the protective terminal cover in place, use the
three leads to the compressor terminals that were
disconnected at the nearest point to the compressor
and connect the common, start and run clips to the
respective leads.
3. Connect good capacitors of the right MFD and
voltage rating into the circuit as shown.
4. With power ON, close the switch.
Line voltage now present
WARNING
WARNING
WARNING
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