Findings library
Abnormal heating at knife-blade connections on a rooftop RTU disconnect, B phase hottest
Abnormal heating at the knife-blade and pivot connections of a rooftop RTU disconnect at a cold storage facility, with the B phase reading hottest, consistent with possible deterioration or increased resistance at the connection.
What was found
Thermal imaging identified elevated temperatures at both the A-phase and B-phase knife-blade and pivot connections of a rooftop RTU disconnect serving a cold storage facility, with the B phase reaching the maximum recorded temperature of 130.7°F. The heating pattern is consistent with possible deterioration or increased resistance at the connection. The exact condition was not disassembled and verified at the time of the scan, so further evaluation is recommended.
Why it mattered
This disconnect served rooftop HVAC and refrigeration equipment at a cold storage facility.
Potential consequences
Continued degradation or failure could interrupt the equipment this disconnect supplied and potentially affect temperature-controlled operations.
Recommendation
Inspect, disassemble, clean and reassemble to proper component torque. Replace component if necessary.
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