Electrical Checkout; Overload Check; Compressor Check - Cornelius 500 Series Installation And Service Manual

Continuous Flow Icemaker Installation and Service Manual
NOTE: If the auger turns with nut, remove the cover on top of the gear motor stator and hold the
motor while loosening nut.
Figure 20. Overload Check
E C
LECTRICAL HECKOUT
1. Be sure the unit is disconnected from the power source. Remove the compressor electrical box cover. Check
for obvious damage and loose wires.
2. Disconnect the fan motor leads. Since capacitors store energy, short the capacitor with a screwdriver. This will
prevent shocks.
3. Disconnect the compressor terminal wires.
O C
VERLOAD HECK
Using a volt-ohmmeter check the continuity across the overload, contact #1 and #3. If none, wait for unit to cool down
and try again. If still no continuity, the overload protector is defective and should be replaced.
C C
OMPRESSOR HECK
The resistance readings on the windings should be between 0.25 to 10.00 ohms, a meter capable of these low
readings must be used.
1. Check between terminals "C" and "R." Replace the compressor if there is no continuity, the run windings are
open.
2. Check between terminals "C" and "S." Replace the compressor if there is no continuity, the start windings are
open.
3. Check between terminals "C" and "R" or "S" and the shell of the compressor. If there is continuity, replace the
compressor, the motor is grounded.
4. Check between screw terminal on the overload and "C" on the compressor. Check and repair the lead or con-
nections if there is no continuity.
Publication Number: 638085278
(See Figure 21)
(See Figure 22)
Figure 21. Compressor Check
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