Copyright Goodheart-Willcox Co., Inc. Chapter 32 Residential Split Air-Conditioning Systems 801 10 uses a gas-fired furnace to provide heat. A compression refrigeration system provides the cooling, Figure 32-7. In the system shown, an A-coil evaporator is located in the furnace plenum chamber. The condensing unit (compressor, condenser, and condenser fan) is located out- side the building. Generally, a central air-conditioning system uses a TXV or fixed orifice metering device to control refrigerant Power in Humidifier Heated air Thermostat (in conditioned space) Return air Flue Air filter Blower Drain Gas valve Burner HEATING MODE Goodheart-Willcox Publisher Figure 32-6. A complete central air-conditioning system that provides both heating and cooling. The heating cycle is shown here, using a gas-fired furnace. A humidifier in the plenum chamber adds moisture to the warmed air. The same blower and air filter are used for both heating and cooling operations. Telephone Etiquette It is important to use good manners when speaking on the telephone. Always be courteous, and be mindful of the volume and tone of your voice. Place a caller on speaker only if the phone call requires it, such as during a conference call that involves multiple participants in one location. If the situation requires you to place a caller on hold, be sure to explain why you are leaving the conversation, and return to the call as quickly as possible. There may be times you cannot answer your phone, such as when you are working with another customer. Be prompt when returning phone calls. Industry standard is to return a call within 24 hours after a request for a return call is received. Returning a call promptly lets a caller know he or she is important. Discussion Questions: 1. You are with a customer presenting an estimate for a new air-conditioning system. You have forgotten to place your phone on silent, and it begins to ring. How can you handle this situation in a professional manner? 2. You have just left a jobsite and the client calls to tell you that you have tracked dirt through his home. How can you handle this in a professional manner? Soft Skills for HVACR