ClimateMaster’s Tranquility Vertical Stack Series ducted heat pump unit, available in 3/4- to 3-ton capacities, features top supply air discharge openings. Designed with a four-wire ATC thermostat connection and standard CXM controller, the unit features: loss-of-charge and high-pressure switches; a lockout safety circuit reset function at the thermostat or disconnect; a five-min. anti-short cycle; random start; high/low voltage and condensate overflow protection; a LED fault indicator; 24VAC or dry contact alarm options; and a low-temperature cutout on the water coil.