The Johnson Controls A19AAC-16 Utility Thermostat is a heavy-duty

or failing to start despite receiving high-voltage input at the 5-pin connector

preventing unnecessary compressor wear during extreme cold cycles

This makes it an ideal solution for air handling units (AHUs) and large heating or cooling coils where maintaining tight temperature tolerances is critical

Copeland 998-0540-00 Limit Switch R-134A The Johnson Controls A19AAC-16 UtilityThe Copeland 998 0540 00 220F Limit Switch is a critical thermal protection component designed for commercial refrigeration and HVAC compressor safety. This discharge line thermostat monitors internal temperatures to prevent compressor overheating, effectively acting as a high limit cutoff. Engineered with a 220F trip point, the switch triggers when the discharge gas temperature reaches the safety threshold, interrupting the control circuit to protect