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TROUBLESHOOTING & REPAIR | ||
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INPUT CONTACTOR (1CR) CLEANING AND/OR REPLACEMENT
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WARNING
DO NOT APPLY INPUT POWER TO THE 
THE CONTACTOR
COVER PLATE
REMOVED. POWER
APPLIED WITHOUT
COVER PLATE IN POSITION MAY CAUSE SEVERE ARCING RESULTING IN BODILY INJURY.
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3.Blow out any dirt or dust from in and around contacts.
4.Examine contacts for signs of wear.
5.If contacts are stuck together or overheated, parts of the contactor, or the entire assembly, should be replaced.
CONTACTOR REPLACEMENT
REMOVAL
1.Using a 11/16” wrench, remove leads L1, L2, L3 and output power leads from 1CR contactor. Mark and label all leads for proper recon- nection. See Figure F.19.
2.Remove lead #257 at secondary thermostat. See Figure F.20 and refer to Wiring Diagram. Remove any cable ties and/or harness looms as necessary.
3.Remove the contactor interlock leads from quick disconnects (leads 211 and 212) and from resistor R3. See Figure
4.Remove input contactor using a 7/16” socket wrench. Remove the four mounting bolts, nuts, and asso- ciated washers (or loosen the two bottom bolts and nuts, and remove the top two).
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FIGURE F.20 - Lead #257 at | FIGURE F.21 - Lead #211 and #212 |
Secondary Thermostat | Quick Disconnects |