Test Procedures - Loads - Scotsman C2648 - SERVICE MANUAL 11-2010 Service Manual

C2648 Service Manual

Test Procedures - Loads

Compressor contactor
1. Test using the controller's indicator lights. When the unit is in ice making mode the compressor
contactor will have power. Check the Compressor indicator light, when it is on the compressor contactor
will have pulled in. If it is not, do a voltage check. Place voltmeter leads on the coil of the contactor.
There should be full voltage . If there is full voltage present and the contactor has not pulled in, replace
the contactor. If there is no voltage check if the high pressure cut out is open. If the high pressure cut out
is closed, check for voltage from the controller. The contactor pin is 4. Check when the compressor
indicator light is on. There should be voltage. If not, replace the controller. If there is voltage at the
controller but not at the contactor coil, the harness wires or connectors are damaged and must be
replaced.
2. Test using an ohmmeter. Test the coil of the contactor for continuity or shorts to ground. Replace if
open or shorted.
3. Check connections and contacts. Be sure connections are tight and that the contacts are not burnt.
Replace any contactor with burnt contacts.
This light will be ON when the
compressor contactor is
November 2010
Page 29