Copeland 998 1000 52 DTC Valve & Thermostat Kit THPU32HP7Y Quiet Operation: Precision balanced components reduce Quiet Operation: Precision balanced components reduce decibel levels during high static operation Common Questions: Which HVAC brands use the 1178661 Fan Guard It's intended for HVAC and refrigeration technicians servicing or replacing existing discharge temperature protection components on Copeland compressor systems — particularly on low temperature and high compression ratio applications where discharge temperature runs hottest and compressor life is most sensitive to thermal overload What does a DTC valve and thermostat kit actually do