Installing Residential Central Air Conditioning Systems 24.11 This is a condensing unit with flared or brazed tubing connections and service valves. Refrigerant.

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Presentation transcript:

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