Installing Residential Central Air Conditioning Systems This is a condensing unit with flared or brazed tubing connections and service valves. Refrigerant control is provided by a thermostatic expansion valve.
Rooftop Units Rooftop units were originally developed for flat-roofed commercial structures.
26.3 Thermostat Operation A bimetal-operated thermostat with four mercury switches (two are shown highlighted).
Basic Refrigeration Cycle
3.4 Low-Side Float Refrigerant Control Note the float needle, low- side float, and pressure motor control.
3.5 External-Drive (Open) Refrigeration System
3.12 Cascade Refrigerating Systems
3.13 Modulating Refrigeration Cycle